User manual POLYCOM EF2280 - REFERENCE MANUAL

Vortex EF2280 Reference Manual VORTEX EF2280 REFERENCE MANUAL Introduction....................................................................................................2 Product Features .................................................................................................... 3 Pre-Installation...............................................................................................4 EF2280 Front and Rear Panels.............................................................................. 5 Installation .....................................................................................................7 Mounting the EF2280 ............................................................................................. 7 Connecting the EF2280 to Other Equipment ......................................................... 7 Device IDs on the EF Bus....................................................................................... 9 Connecting Multiple EF2280s................................................................................ 9 Factory Default Settings (Preset 0) ........................................................................ 11 Check Surrounding Equipment............................................................................... 13 Integrating the EF2280 Into Your System .....................................................15 Input Settings .......................................................................................................... 15 Calibration.............................................................................................................. 15 Build Your Echo Canceller Reference.................................................................... 17 Echo Canceller Reference for Multiple EF2280s................................................... 18 Configure the Automatic Microphone Mixer.......................................................... 20 Automixer Settings for Multiple EF2280s .............................................................. 22 Configure the Matrix Mixer.................................................................................... 23 Building Your System with Multiple EF2280s........................................................ 23 Presets..................................................................................................................... 25 Other EF2280 Features.......................................................................................... 25 LCD Menu Structure .....................................................................................26 System Menu ........................................................................................................... 29 Inputs ...................................................................................................................... 30 Outputs.................................................................................................................... 31 Automixer Menu...................................................................................................... 32 Matrix Menu ........................................................................................................... 34 Parametric EQ Menu.............................................................................................. 35 Troubleshooting .............................................................................................36 Automatic Microphone Mixer................................................................................. 36 Matrix Mixer........................................................................................................... 37 Echo Canceller Reference ...................................................................................... 37 Residual Echo ......................................................................................................... 37 Contacting Technical Support ................................................................................ 42 Technical Specifications ................................................................................43 Compliance ............................................................................................................. 43 Conference System Design ............................................................................46 EF2280 Block Diagram .................................................................................47 Connector Pinouts..........................................................................................48 Connecting Unbalanced RCA to Balanced Mini Phoenix...................................... 50 Making an EF Bus Terminator ............................................................................... 50 Additional Notes ..................................................................................................... 51 Warranty Information ....................................................................................52 Definition of Terms .......................................................................................54 Index ..............................................................................................................57 Polycom, Inc., Copyright 2001 Technical Support: 800.932.2774 1 INTRODUCTION INTRODUCTION Welcome How to Use This Manual Congratulations on your purchase of the Vortex EF2280! This is a reference manual for your EF2280. It is structured to provide the information you need quickly and conveniently. The following is an overview of each section: · · · · · Introduction Conference System Design gives suggestions on topics to consider when designing your system. Pre-Installation includes information about the contents of the box, tools needed for installation and front and rear panel descriptions. Installation covers connections of inputs/outputs and calibration of inputs of the EF2280. Integrating the EF2280 Into Your System describes adjustments to take into consideration when integrating the EF2280 with surrounding equipment in your system. LCD Menu Structure describes an overview of the LCD menu structure and also gives a system overview of features and options available. Troubleshooting helps to debug problems with installation. Technical Specifications provides the technical specifications of the EF2280. EF2280 Block Diagram shows the inside of the EF2280. Connector Pinouts shows pinout diagrams for EF2280 input and output connectors. Warranty Information Definition of Terms explains terms used in this manual, as well as terms used in our technology of echo cancellation, noise cancellation, and audio conferencing. · · · · · · · About the EF2280 The EF2280 is a 12-input, 12-output, 8-channel acoustic echo and noise canceller with matrix mixing and automatic microphone mixing capabilities. It includes a total of 12 analog inputs (8 mic/line level inputs and 4 line level inputs), 12 analog outputs, and 4 digital expansion busses. Acoustic echo cancellation (AEC) and noise cancellation can be applied to each of the 8 mic/line level inputs, and each of these inputs can then be sent to one of the two internal automatic microphone mixers. The system also contains a 25 x 18 main matrix, and four 7 x 3 submatrices. The 25 x 18 main matrix has the following inputs: input channels 1-8 (gated or ungated), input channels A-D, the internal signal generator, and 3 mixes of each of the four digital busses (3 mixes times 4 busses equals 12 inputs). The 25 x 18 main matrix has the following outputs: outputs 1-8 and A-D, AEC reference 1 and 2, and W, X, Y, and Z outputs to the digital expansion bus. The EF2280 has 24 bit resolution, 32-bit floating point computation, and a 48 kHz sampling rate. Polycom's proprietary noise cancellation on each of the 8 mic/line inputs helps to keep overall ambient noise to a minimum. Polycom echo cancellers are the only ones on the market to feature this patent pending technology. Noise cancellation filters out ambient background noise such as noise from heating, ventilating and air conditioning (HVAC), LCD projectors, and road noise. Our noise cancellation technology is not a noise gate. It actually removes noise. Therefore, it enhances the operation and VORTEX EF2280 Reference Manual 2 Technical Support: 800.932.2774 INTRODUCTION improves the sound quality of an automixer, for example, by preventing it from bringing the noise level up and down when microphones are gated on and off. By cancelling the noise picked up by each microphone, the overall signal to noise ratio (SNR) is preserved. The result is crystal clear speech over a greater decibel range than any other echo canceller. That means reduced listener fatigue and a higher quality audio conference. Warranty Registration Please take a moment to fill out and return your warranty registration card. This information will help us to provide you with better customer support and will allow us to notify you with updated product features and software. PRODUCT FEATURES Product · · · · · · · · Front panel LCD for controlling and configuring the product without a computer 5-band equalizer on all Inputs and Outputs (Parametric, High/Low Pass, High/ Low Shelf) Echo cancellation on Inputs 1-8 Noise cancellation up to 15 dB Two internal automatic microphone mixers for Inputs 1-8 25 x 18 full cross point matrix mixer with expansion bus Internal signal generator for calibration mode and noise masking applications 2 year warranty AEC · · · · · 24 bit resolution 48 kHz sampling rate, >20 kHz bandwidth 270 ms AEC tail length 40 dB/sec convergence rate Can function in rooms with more than 10 dB of room gain Inputs and Outputs · · · · · · · 8 microphone/line level inputs with phantom power on each input 24 VDC Phantom Power 4 line level auxiliary inputs with nominal level of 0 dBu 12 digitally controlled analog trimpots for the 12 input signals 12 line level outputs with default nominal level of 0 dBu Automatic Gain Control (AGC) on Inputs 1-8. Phoenix connectors for audio input and output Remote Control · · · · · · RS-232 port for remote control Reconfigurable parallel logic input/output ASPI bus for controlling multiple EF devices from a single controller EF bus for linking multiple EF2280s. Digital bus with 4 audio busses, 48 kHz sampling rate Up to 8 devices can be linked, each device providing 4 audio signals on the bus © Polycom, Inc. 3 VORTEX EF2280 Reference Manual PRE-INSTALLATION PRE-INSTALLATION What's Included The Vortex EF2280 product package includes the following items: · · · · · · · · · · Vortex EF2280 Reference Manual Vortex EF2280 External power supply Cat 5 cable for EF Bus or ASPI Bus EF Bus terminator Rack mount screws (4) Phoenix connectors (24) Cable clamp and screw CDROM containing other manuals and Conference Composer software Warranty Registration Card Rackmount Screws (4) x x Vortex® EF2280 x x Phoenix Connectors (24) Cable Clamp and screw EF Bus Terminator CDROM with control software and manuals Vortex® EF2280 Reference Manual External Power Supply 1-Cat 5 cable (6 inches) for EF Bus or ASPI Bus Vortex EF2280 Reference Manual Figure 1. What's Included with your Vortex EF2280. What's Not Included The following equipment is not included with the EF2280 product package, but may be necessary to create a completely functional system: · · · · · · · Microphones Loudspeakers Audio amplifier (or amplified loudspeaker) EF200 Phone Add Audio cables Videoconferencing codec or other four-wire interface (optional) RS-232 remote control device (optional) Tools Needed for Installation · · Screwdriver to mount the EF2280 in your rack. Phoenix connector screwdriver VORTEX EF2280 Reference Manual 4 Technical Support: 800.932.2774 PRE-INSTALLATION EF2280 FRONT AND REAR PANELS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Figure 2. EF2280 Front and Rear Panels 1. 2. 3. 4. 5. 6. 7. 8. LCD DISPLAY. Displays menu instructions for configuration and operation of the EF2280. DOWN BUTTON. Scrolls backward through menu items at a particular level or decreases the value of a parameter. UP BUTTON. Scrolls forward through menu items at a particular level or increases the value of a parameter. ENTER. Enters the menu and allows you to select and change parameter values. ESC. Returns to the next highest level of menus. HOME. Returns to the top of the menu structure. LEVEL INDICATOR. Indicates the level of the selected channel or parameter. CHANNEL ACTIVITY LEDS. Indicates gating activity of the 8 mic/line channel inputs. © Polycom, Inc. 5 VORTEX EF2280 Reference Manual PRE-INSTALLATION 9 10 11 12 13 14 15 Figure 3. Parallel remote control, EF BUS, serial remote control, ASPI BUS OUT, and power supply input on back panel of the EF2280. 9. 10. 11. 12. 13. INPUT PARALLEL PORT. Parallel logic input. OUTPUT PARALLEL PORT. Parallel logic output. EF BUS IN. Connects to EF BUS OUT of another EF2280. EF BUS OUT. Connects to the EF BUS IN of another EF2280. RS-232 SERIAL PORT. Connect this to an optional RS-232 remote control device, such as a touch panel or personal computer COM port. 14. ASPI BUS. Connects to the ASPI Bus of another EF device (an EF1210 or an EF200) to be used for RS-232 control from a single control device. 15. POWER SUPPLY INPUT. Connects to the external power supply provided with the EF2280. 16 17 18 19 Figure 4. Inputs and outputs on back panel of the EF2280. 16. MIC/LINE INPUTS. Connects to microphone at either mic or line level, with or without phantom power. 17. LINE INPUTS. Inputs A-D at line level. 18. LINE OUTPUTS. Outputs 1-8 at line level. 19. LINE OUTPUTS. Outputs A-D at line level. VORTEX EF2280 Reference Manual 6 Technical Support: 800.932.2774 INSTALLATION INSTALLATION MOUNTING THE EF2280 The EF2280 can be mounted in a rack enclosure using four large screws (10-32x1/2") included with the unit. One EF2280 fits in a single rack space. Recommendation For Easy Access While not required, leave a single rack space in between the EF2280 and other units in your rack. This gives you easier access to the back panel. If you cannot leave a single rack space, mount the EF2280 below units that are longer in length so that you can access the Phoenix connectors on the back panel more easily. Instructions for Securing Power Supply to Back of EF2280 · · · · · Locate the cable clamp on the back panel of the EF2280 above the RS-232 port. Remove the screw and thread the power cord through the cable clamp. Attach the cable clamp to the back panel of the EF2280 and tighten the screw. Align the clamp so that the power cable does not interfere with the connectors on the EF2280 back panel. Plug in the power supply. We recommend that you also Ty-wrap the power supply to the rack. The purpose of securing the power supply to the back panel is so that if the power supply were to drop, it would pull where the cord is attached with the cable clamp and not pull the plug out of the EF2280. Caution! Do not use any other power supply other than the one provided with this unit. CONNECTING THE EF2280 TO OTHER EQUIPMENT Grounding The EF2280 has 8 mic/line inputs plus 4 line level inputs and 12 line level outputs. Each input/output is "Pin 1 compatible" -- this means that the ground pin of each input/output is tied to chassis ground. Chassis ground is connected to the input power ground. Typical EF2280 Connections The EF2280 will typically be connected to other equipment in a single room setup as shown below in Figure 5 and Figure 6. © Polycom, Inc. 7 VORTEX EF2280 Reference Manual INSTALLATION In 1 In 2 In 3 In 4 In 5 In 6 In 7 In 8 Out 1 Out 2 Out 3 Out 4 Out 5 Out 6 Out 7 Out 8 Vortex® EF2280 In A In B In C In D Out A Out B Out C Out D Video CODEC Line In Line Out From AEC From Rem. To AEC To Rem. EF200 Phone PSTN Figure 5. Block diagram of typical EF2280 connections: a single room using one EF2280. PSTN ASPI Bus Connection for RS-232 Control EF200 Phone Add (Optional) 8 microphones RESERVED (SET TO OFF) RESERVED (SET TO OFF) AGC NOISE SUPPRESSION EPROM OVERRIDE DEVICE ID 4 DEVICE ID 3 DEVICE ID 2 DEVICE ID 1 DEVICE ID 0 ... REMOTE CONTROL ASPI BUS TO PHONE IN 5, 15 VDC RS-232 EF400 INTERFACE FROM AEC TO AEC FROM TO REMOTE REMOTE ON OFF LOGIC IN/OUT ASPI BUS OUT TO LINE Vortex® EF2280 Reference Input Polycom Video Codec 4-wire Connection POLYCOM CODEC TX RX Room Amplifier Audio Amplifier Figure 6. Typical EF2280 connections. VORTEX EF2280 Reference Manual 8 Technical Support: 800.932.2774 INSTALLATION The following steps are typically used to setup the EF2280: · Connect a microphone to each of the 8 mic/line level inputs. The mic/line input accepts mini-Phoenix connectors. See "Connector Pinouts" on page 48 for pinouts of Phoenix connectors. Connect one line output to an amplifier or powered loudspeaker. Connect the reference input (Input A, B, C, or D) to TO AEC on the EF200 (if you have multiple EF200's, connect only one reference) or to the output of the codec. Connect one line output to FROM AEC on the EF200 or to the input of your codec. If RS-232 remote control is desired, connect the RS-232 REMOTE CONTROL port of the EF2280 to the remote control device, such as an RS-232 interface to a touch panel or a COM port on a personal computer. If you are using an EF200 Phone Add, connect the ASPI BUS on the EF2280 to the ASPI BUS IN on the EF200. · · · · Note. If you are linking multiple EF2280s, you must use the EF bus to link the units. If you are linking a EF2280 to other EF devices, such as the EF200 Phone Add, for RS-232 control, use the ASPI bus. See Figure 8 on page 11. · Connect the external power supply to the POWER SUPPLY INPUT jack of the EF2280. DEVICE IDS ON THE EF BUS When considering which Device IDs can be used for which Vortex device, decide how many devices have the ability to transmit on the W, X, Y, and Z busses, and how many have the ability to transmit on the P Bus. The EF2280, for example can only transmit on the W, X, Y, and Z busses while the EF2241 can transmit on the W, X, Y, and Z busses as well as the P bus. Up to 8 devices can transmit on the W, X, Y, and Z busses. Similarly, up to 8 devices can transmit on the P bus. Note that the EF2241 counts as one of both types. CONNECTING MULTIPLE EF2280S Up to 8 EF2280s can be linked together at one time. Each unit in the chain must have a unique Device ID. Use the EF Bus to link multiple EF2280s together. The following steps should be followed to connect the EF Bus: 1. 2. 3. 4. Set a unique Device ID for each EF2280 Power off all units Connect the RS-232 remote control device to any EF2280 in the chain. Connect the provided Cat-5 cable between the EF BUS OUT of the first device, and the EF BUS IN of the second device. Note. The EF Bus must be connected so that the EF Bus In of one box is connected to the EF Bus Out of another. Connecting the EF Bus In to another EF Bus In (or Out to Out) will not work. © Polycom, Inc. 9 VORTEX EF2280 Reference Manual INSTALLATION 5. 6. 7. Connect another Cat-5 cable between the EF BUS OUT of the second device and the EF BUS IN of the third device, and so on. Terminate the chain of EF2280s using the instructions below. Power on all units at the same time Terminating the EF2280 The EF2280 must be terminated with the provided EF Bus terminator. Place a terminator in the EF BUS IN of the first device in the chain and also in the EF BUS OUT of the last device. If you lose the terminator provided with your EF2280 unit, see "Making an EF Bus Terminator" on page 50 for information and instructions on how to make one. EF Bus Terminator Cat-5 cable Cat-5 cable EF Bus Terminator Figure 7. Connecting and terminating multiple EF2280s. The EF2280 does not have to be terminated if you are using a single unit not connected together with another EF2280. ... Cat-5 cable Connecting the EF2280 with Other EF Devices If you are linking multiple EF2280s, you must use the EF bus to link the EF2280s to each other. If you are linking a EF2280 to other EF devices, such as the EF200 Phone VORTEX EF2280 Reference Manual 10 Technical Support: 800.932.2774 INSTALLATION Add, for RS-232 control, use the ASPI bus. The ASPI Bus does not need to be terminated. See Figure 8 below. In 1 In 2 In 3 In 4 From AEC From Rem. To AEC In 5 To Rem. In 6 Out 1 Out 2 Out 3 Out 4 Out 5 Out 6 Out 7 Out 8 Vortex® EF200 Phone ASPI Bus In ASPI Bus Out In 7 In 8 In A In B In C From AEC From Rem. To AEC To Rem. EF Bus Terminator In D EF2280 Out A Out B Out C Out D EF Bus In ASPI Bus EF Bus Out EF200 Phone ASPI Bus In ASPI Bus Out In 1 In 2 In 3 From AEC From Rem. To AEC In 4 To Rem. In 5 Out 1 Out 2 Out 3 Out 4 Out 5 Out 6 Out 7 EF200 Phone ASPI Bus In ASPI Bus Out In 6 In 7 In 8 In A In B In C In D Vortex® EF2280 Out 8 Out A Out B Out C Out D EF Bus In ASPI Bus EF Bus Out EF Bus Terminator Figure 8. Linking the EF2280 to other EF devices. FACTORY DEFAULT SETTINGS (PRESET 0) The following is a list of the factory default settings of the EF2280. Since the microphones and other equipment in your application may have different nominal levels, you can start with a FACTORY PRESET (Presets 0-15), change it to match your environment and then save it within the EF2280 as a USER PRESET (Presets 16-47). Once you've saved a USER PRESET, set the POWER ON PRESET to that USER PRESET (or © Polycom, Inc. 11 VORTEX EF2280 Reference Manual INSTALLATION whichever preset you want to come up after power up). The unit will need to be configured for your system. PROGRAM PARAMETERS SYSTEM PARAMETERS Preset Device ID AUTOMIX PARAMETERS Chairman Mode Decay Time Hold Time Last Mic On Mode Max NOM per Automixer Off Attenuation INPUT CHANNELS Acoustic Echo Cancellation Automatic Gain Control Automixer Echo Canceller Reference Filtering Gate Priority Gate Ratio Gate Threshold Gating Input Gains On On 1 Ref1 Off 1 10 dB Adaptive Auto 15 dB for Inputs 1-8 0 dB for Inputs A-D 60 dB Off On 10 dB On Off 1000 ms 500 ms On (on Automixer 1) 8 -15 dB 0 0 FACTORY DEFAULT PRESET VALUE Manual Threshold Mute Noise Cancellation Noise Cancellation Level Phantom Power OUTPUT CHANNELS Mute NOM Attenuation Off Off for Outputs 1-8 On for Outputs A-D 0 dB Output Gain VORTEX EF2280 Reference Manual 12 Technical Support: 800.932.2774 INSTALLATION Presets and Multiple EF2280s PRESET 0 is preconfigured for a system with multiple EF2280s. Microphones are bussed out to other units on the W Bus. Microphones are also input into each EF2280 on the W Bus (INPUT WM0 in the Matrix). If you have multiple EF2280s in your system, save settings to a preset on each EF2280. Saving a preset will only save the preset on that particular unit. Also, remember to set the POWER ON PRESET to the correct Preset. CHECK SURROUNDING EQUIPMENT Now that the physical connections to the EF2280 are set up, it may be necessary to check the surrounding equipment to make sure levels are set correctly. The following suggestions may be helpful in integrating the EF2280 into your system: Pick a Standard Signal Level A standard nominal signal level should be used throughout the audio system. Any equipment that does not operate at this standard level should be compensated for as close to the piece of equipment as possible. A 0 dB nominal level is a good standard signal level. For example, a consumer VCR will probably generate a -8 dBu level. As soon as the VCR signal arrives at an input with some gain control, the input gain should be adjusted so that you get a 0 dB level. Check Levels to the Codec Configure the matrix mixer output to the codec input. The output gain of the matrix mixer should be set to match the nominal input level of the codec. For example, if the codec accepts -10 dBV (-8 dBu) inputs, 8 dB of attenuation should be applied at the matrix mixer output to the codec. Configure the matrix mixer input from the codec output. The input gain of the matrix mixer should be set to match the nominal output level of the codec. For example, if the codec outputs a -10 dBV (-8 dBu) level, 8 dB of gain should be applied on the matrix mixer input. This will bring the codec level up to 0 dBu inside the matrix. Configure Output to Amplifier or Loudspeakers The loudspeaker level may be adjusted in several places: at the amplifier or at the loudspeaker output of the matrix mixer in the EF2280. We suggest that you adjust the loudspeaker level at the amplifier to preserve good gain structure. You should try to have a 0 dBu nominal level at the outputs by applying input gain (See INPUTS tab on Conference Composer) to obtain a 0 dB level at the input. Verify Room Gain After adjusting the loudspeaker level, verify the room gain in your system using the ROOM GAIN meter on the DIAGNOSTICS page of Conference Composer. See Figure 9 below. The meter shows the room gain, which is the relative level of the output level and the input level. While the EF2280 will operate in positive room gain conditions, the room gain should be around 0 dB or a negative value. If you have a positive room gain, make adjustments in the following areas: 1. 2. Decrease the Input Gain of the microphone. Decrease the Output Gain of the microphone. © Polycom, Inc. 13 VORTEX EF2280 Reference Manual INSTALLATION 3. OR adjust the placement of the microphone relative to the loudspeaker. Room Gain Meter Read Room Gain from here Figure 9. Room Gain Meter on the Diagnostics page of the Conference Composer control software. Configure Program Audio Sources Set the gains on the matrix mixer inputs from the program audio sources so that program audio is played into the room at a level similar to that of speech from the remote site. This should also ensure that the program audio levels are good when sent to the remote site. VORTEX EF2280 Reference Manual 14 Technical Support: 800.932.2774 INTEGRATING THE EF2280 INTO YOUR SYSTEM INTEGRATING THE EF2280 INTO YOUR SYSTEM Operating the EF2280 The EF2280 can be operated in two ways: through the LCD menu on the front panel or through RS-232. For control via RS-232, please refer to the EF2280 Programming Guide, which includes programming tips as well as the EF2280 RS-232 commands. For operation using the PC control software, Conference Composer, please refer to the Conference Composer User Guide. Use Conference Composer Software to easily configure the EF2280 with a PC, or refer to the Applications Guide for different configurations that are already programmed into factory presets. INPUT SETTINGS Set Inputs 1-8 for Mic or Line Level Configure Inputs 1-8 for mic or line level using the LCD menu (See "Level" on page 30) or Conference Composer Control Software (See the Conference Composer User Guide). Select Phantom Power for Inputs 1-8 Turn phantom power On or Off for Inputs 1-8 using the LCD menu (See "Phantom Power" on page 31) or Conference Composer Control Software (See the Conference Composer User Guide). Phantom power should be turned On for condenser and electret microphones. CALIBRATION When using the power on Preset 0, the following calibration can be used. Set Mic/Line Input Channel Gains In Preset 0, Automatic Gain Control (AGC) is On and the microphone gains on Inputs 1-8 are set to 15 dB. The AGC will compensate for the microphone gain. If you are using ceiling microphones, set the microphone gain to 28 dB. Fine tune the Input Gain using the Automatic Gain Control (AGC) meter on Conference Composer Software. In the Conference Composer Software, go to the DIAGNOSTICS page. Watch the meter labelled AGC while someone is talking into the particular channel that you are adjusting. Watch the number in the box at the bottom of the AGC meter (See Figure 10 below). This is the amount of gain that the AGC is applying. The goal is to have the AGC meter on average staying around 0. If the level that you see in the box is negative, decrease the input gain by the average number that you see in the box because the AGC is attenuating the channel's input gain because the level is too high. If the number in the box is positive, increase the input gain on that channel because the AGC is boosting the signal because it is too low. For example, if the meter is showing an average gain of -15 dB, © Polycom, Inc. 15 VORTEX EF2280 Reference Manual INTEGRATING THE EF2280 INTO YOUR SYSTEM you should increase your input gain by 15 dB. If the meter shows an average gain of +10 dB, you should decrease your input gain by 10 dB. AGC Level Meter Read AGC le Adjust Input Gain here Figure 10. AGC Meter on the Diagnostics page of the Conference Composer software. IF THE AGC METER SHOWS... positive gain negative gain an average level of 0 dB ADJUST THE INPUT GAIN IN THIS WAY. Increase gain by the level shown in the box. Decrease gain by the level shown in the box. You've set the Input Gain to a good level! Table 1: How to set the Input Gain using the AGC meter on the Conference Composer Diagnostics page. Set Levels on Line Input Channels Set the line input channel gains (Channels A-D) to match the nominal level of the incoming equipment. The line inputs have a maximum nominal level of 0 dBu. If your incoming line level inputs have a higher nominal level than 0 dBu you will want to use a pad to remove the level. VORTEX EF2280 Reference Manual 16 Technical Support: 800.932.2774 INTEGRATING THE EF2280 INTO YOUR SYSTEM Customize Setting for Your Particular Application The following sections will describe customizing parameters on the EF2280 for your particular application if you are not using Preset 0. BUILD YOUR ECHO CANCELLER REFERENCE The acoustic echo canceller (AEC) reference should generally contain exactly the same audio signals as what is coming out of your loudspeaker(s), since the signal output from the loudspeaker is what is then picked up by the room's microphones causing acoustic echo. Note that this statement is a general statement. Conditions for this being true follow: If your system does NOT have sound reinforcement, · · · The AEC reference should contain exactly the same audio as the loudspeaker output: all far end audio, audio from the phone add, program audio, etc. If your system contains stereo inputs and outputs, the reference must contain a mix of both stereo inputs. For example, if your VCR audio is in stereo, the reference should contain both the left and right signals each attenuated by 3 dB, as well as any other audio that is going to your loudspeaker. If you are using crosspoint gains in the loudspeaker mix, apply the same gains to the signals in your reference. If your system has sound reinforcement, · · Do NOT mix your room microphones into the reference, but include all other audio (program audio, remote audio, phone audio, etc.). An exception to this rule is when you use one EF2280 split to operate independently in two rooms. If the two rooms communicate with each other (along with communicating via codec and the phone line), the reference in the first room must contain the microphones from the second room and vice versa. See Figure 11 below. © Polycom, Inc. 17 VORTEX EF2280 Reference Manual INTEGRATING THE EF2280 INTO YOUR SYSTEM If Room 1's loudspeaker contains a mix of Room 2's microphones, then Room 1's AEC reference should also contain Room 2's microphones. The same is true for Room 2's AEC reference. From AEC To AEC To Rem. In 1 In 2 In 3 In 4 In 5 In 6 In 7 In 8 Out 1 Out 2 Out 3 Out 4 Out 5 Out 6 Out 7 Out 8 Polycom Video CODEC Line In Line Out From Rem. EF200 Phone PSTN From AEC To AEC To Rem. Polycom Video CODEC Line In Line Out From Rem. Vortex® EF2280 In A In B In C In D Out A Out B Out C Out D EF200 Phone PSTN Figure 11. AEC reference for two rooms that communicate with each other with one EF2280. ECHO CANCELLER REFERENCE FOR MULTIPLE EF2280S In a system with multiple devices, we recommend that one device be designated as the unit that provides the EF bus reference for the acoustic echo cancellers. This unit takes one of its reference signals (either Ref 1 or Ref 2) and places it on the EF bus. All other units that are linked together may use the EF bus reference as the reference for their echo canceller, or they can use their own internal references. The references may include a mix of any input, with crosspoint gains, including W, X, Y, and Z busses. Set the EF Bus Reference in the System Menu of the LCD Menu (See "EF Bus Reference" on page 29). Setting up the Bus Reference If all far end audio and program audio sources are on the same EF2280, 1. 2. Assign far end audio and program audio sources to Reference 1 on the originating EF2280. On the EF Bus page in Conference Composer for the originating EF2280, set the Exported Signals to REFERENCE 1. Only one EF2280 can put an echo canceller reference on the EF Bus as the Bus Reference. On all linked EF2280s, set the echo canceller reference to BUS. 3. For example, a system uses 2 EF2280s, 1 EF200, and 1 Polycom VS4000 video codec. The originating sources for far end audio is EF2280 with ID 0. The Matrix for VORTEX EF2280 Reference Manual 18 Technical Support: 800.932.2774 INTEGRATING THE EF2280 INTO YOUR SYSTEM this EF2280 in Conference Composer is shown in Figure 12 and the EF Bus page in Figure 13. Conference Composer will not allow more than one EF2280 assign their echo canceller reference as the Bus Reference. Notice that the EF200 and VS4000 inputs are both assigned to Reference 1 on the originating EF2280. The Matrix for any linked EF2280s is shown in Figure 14. Figure 12. Matrix page of origin EF2280 (ID 00) Figure 13. EF Bus page of origin EF2280 (ID 00) Figure 14. Matrix page of linked EF2280s © Polycom, Inc. 19 VORTEX EF2280 Reference Manual INTEGRATING THE EF2280 INTO YOUR SYSTEM If far end audio and program audio sources are on several EF2280s, 1. 2. Bus each far end audio and program audio source to each EF2280. Do this by assigning each signal input to either the W, X, Y or Z bus. Assign an echo canceller reference on each EF2280 that will include all far end audio and program audio sources. CONFIGURE THE AUTOMATIC MICROPHONE MIXER The EF2280 contains two independent automatic microphone mixers. Each input may be assigned to automatic mixer 1, automatic mixer 2, or neither (but not both). Assign all microphones to the same automixer when using all microphones in the same room but in different zones, so that a person does not activate microphones in two different zones (which they would tend to do if each zone had its own automatic mixer). Use both automatic mixers when the EF2280 is split to operate independently between two rooms. One automatic mixer is used in each room. The advantage of having two independent automatic mixers is that when used in two rooms, microphone signals in one room do not affect the gating behavior of microphones in the other room. Set an input channel to use neither automatic mixer if an input is not actually a microphone, but is a program audio input. For instance, if you only have 6 microphones and you have an extra stereo program audio source that you want automatic gain control (AGC) on and/or noise cancel, you could set its channels to be on neither automatic mixer. If you have a PC, use the Conference Composer software (See the Conference Composer User Guide) to set the automixer parameters. If you would like to set automixer parameters using the LCD menus, see "Automixer Menu" on page 32 for instructions on setting automixer parameters. Automixer Parameters The following parameters configure how the EF2280 automatic microphone mixer operates. Parameters include the following: Decay Time, Hold Time, Camera Gating Threshold, Chairman Mode, Chairman Mic, Last Mic On Mode, Last Mic Number, Local Max NOM, Global Max NOM, Off Attenuation, Threshold Type, Gating Mode, Gate Ratio, Manual Threshold, and Microphone Priority. Signal Level Channel turns on when signal level is above gate ratio DECAY TIME Channel ON GATE R ATIO Channel OFF Ambient Level Microphone Audio HOLD TIME OFF A TTENUATION Time Figure 15. Off Attenuation, Hold Time, Gate Ratio, and Decay Time. VORTEX EF2280 Reference Manual 20 Technical Support: 800.932.2774 INTEGRATING THE EF2280 INTO YOUR SYSTEM Global Settings. Decay Time. Decay time is the amount of time the microphone audio takes to ramp down to the Off Attenuation level after Hold Time. Decay Time values range from 0 to 5000 msec. The default value is 1000 msec. Hold Time. This is the amount of time the microphone stays On after the energy in the channel drops below the gating threshold. The default value is 500 msec. The range is 1 to 5000 msec. Microphone channels gating On and Off too frequently during short pauses in speech might be the result of setting the Hold Time too low while too many microphones gating on at the same time may be the result of Hold Time values that are too high. Camera Gating Threshold. Specifies the hold time for camera gating information. Mixer Settings. Bus Mixer. This command is used to assign one of the two internal automixers to one of the EF Bus automixer groups. For example, consider three EF2280s each of which has four microphones assigned to Automixer 1 and 4 microphones assigned to Automixer 2. Now, if each of these EF2280s sets their Automixer 1 to use Bus Mixer 5, then the three automixers (one from each EF2280) will work as a single automixer containing 12 (3 x 4) microphones. Setting Bus Mixer to 0 means that the automixer is not grouped on the EF Bus. Chairman Mode. Enables or disables Chairman Mode for the specified automixer. Chairman Mic. Sets the Chairman Microphone for the specified automixer. Last Mic On Mode. Sets "Last Mic On" mode for the specified automixer. Last Mic Number. Sets the microphone number that will remain on when "Last Mic On" mode is set to manual. Setting this value to 0 will cause the automixer to leave the last open microphone on. The last microphone number is specified for each automixer, but is only used in manual "Last Mic On" mode. Local Max NOM. Sets the maximum number of open microphones (NOM) limit for the specified automixer. This NOM limit is a "local" limit, meaning that this limit applies only to the specific EF2280 that it is set on. Global Max NOM. Sets the global maximum number of open microphones (NOM) limit for each linked automixer. The maximum value for this command is 64. This NOM limit is a "global" limit, meaning that this limit applies to all linked automixers with the same Bus ID. Off Attenuation. Sets the Off Attenuation (in dB) for the specified automixer. Setting this value to 18 would result in the microphone signals being attenuated by 18 dB when gated off. This value is set independently for each of the automixers. Channel Settings. Automixer (Inputs 1-8). This allows you to select which automatic microphone mixer (1 or 2) a particular microphone channel is assigned to. A microphone may only be assigned to automatic mixer 1, automatic mixer 2, or neither (but not both). Threshold Type. Sets automatic (also referred to as adaptive) or manual automatic gating thresholds per input. Gating Mode. Sets the automixer gating control mode for specified input channel. The possible modes are Normal Gating, Microphone Forced On, or Microphone Forced Off. Adaptive Threshold. This allows you to determine when to gate a microphone on based on an estimate of the background noise level. The default value is to © Polycom, Inc. 21 VORTEX EF2280 Reference Manual INTEGRATING THE EF2280 INTO YOUR SYSTEM gate a channel on if it is more than 10 dB louder than the background noise level. Values range from 0 to 100 dB. To set the gate ratio, scroll through the gate ratio range and select the desired gate ratio by pressing ENTER. Manual Threshold. Sets the automixer gating threshold for the specified input channel. This value is only used if the input set to Manual Gating via the THRESHOLD TYPE option. Microphone Priority. The priority of each microphone can be assigned a value ranging from 1 to 4. Priority 1 microphones have priority over priority 4 microphones for gating. The default is to have all microphones set to priority 1. If Chairman Mode is enabled, all microphones including ones with priority of 1 will be gated off when the Chairman mic gates on. AUTOMIXER SETTINGS FOR MULTIPLE EF2280S When using more than one EF2280 in your room system, you have several possibilities for how you configure the automixer. Each EF2280 can operate as one of the following: · · · · One automixer, independent of other EF2280s linked to it Two automixers, independent of other EF2280s linked to it One large automixer, sharing automixer functions with other EF2280s linked to it Two large automixers, sharing automixer functions with other EF2280s linked to it Figure 16. EF2280 Automixer Settings in Conference Composer Software Automixer and Bus Mixer Settings To operate the EF2280 in any of the above possibilites, two global parameters need to be changed: the AUTOMIXER and the BUS MIXER (see Figure 16). The AUTOMIXER parameter chooses which automixer the input channel will be on (this is changed either on the AUTOMIXER page in Conference Composer or on the MATRIX MIXER page). The BUS MIXER parameter is used to assign one of the two internal automixers to one of the EF Bus automixer groups. For example, consider three EF2280s each of which has four microphones assigned to Automixer 1 and 4 microphones assigned to Automixer 2. Now, if each of these EF2280s sets their Automixer 1 to have Bus ID 5, then the three automixers (one from each EF2280) will work as a single automixer containing 12 (3 x 4) microphones. Setting BUS MIXER to 0 means that the automixer is not grouped on the EF Bus. VORTEX EF2280 Reference Manual 22 Technical Support: 800.932.2774 INTEGRATING THE EF2280 INTO YOUR SYSTEM Operating as an Independent Automixer Operating as One Automixer with Multiple EF2280s Default Settings To set the EF2280 to operate as an independent automixer (or two), set the BUS MIXER parameter to 0, or to a number that is different from any other automixer group on the EF Bus. To set the EF2280 to operate as one automixer across several EF2280s, set the BUS MIXER parameter on all EF2280s to the same automixer group. In the default preset (Preset 0), the Bus Mixer for Automixer 1 is set to 1 and the Bus Mixer for Automixer 2 is set to 2. This means that in the default mode, all linked EF2280s will work together as one complete automixer. CONFIGURE THE MATRIX MIXER The matrix mixer allows arbitrary crosspoint gains in 1 dB increments between any input and output signal. If you have a PC, use the Conference Composer software (See the Conference Composer User Guide) to set the matrix parameters. If you would like to set matrix parameters from the LCD menus, see "Matrix Menu" on page 34 for descriptions and instructions on setting matrix mixer parameters. BUILDING YOUR SYSTEM WITH MULTIPLE EF2280S The following is a checklist for building a system with mutliple EF2280s: 1. 2. 3. 4. Assign Inputs. Assign Outputs. Configure submatrix (the EF Bus). Configure your echo canceller reference. 1. Assign Inputs Assign each audio source to an input. Remember to include the conferencing equipment such as the EF200 Phone Add or a video codec and any program audio. 2. Assign Outputs Try to assign as many outputs as you can to each EF2280 to make a simpler submatrix. Remember that Outputs 1-8 can also be used as outputs of the matrix. The bussing can get very complicated very quickly if you choose to spread your outputs over several units. 3. Configure the submatrix. To link multiple EF2280 devices together, use the submatrix on the EF Bus. © Polycom, Inc. 23 VORTEX EF2280 Reference Manual INTEGRATING THE EF2280 INTO YOUR SYSTEM The EF Bus The EF Bus is a high speed, low delay digital bus that includes the W, X, Y, and Z audio busses as well as the echo canceller reference and remote control information (for other EF2280s) and can link up to 8 EF2280 devices. All busses include NOM information and can be used for sharing microphone inputs, or for sharing mono or stereo program information. Crosspoint Mix Minus Bus. Each EF2280 device in the system can create four output mixes (W, X, Y, and Z) and place them on the bus. Each device also can create three input mixes each from the W, X, Y, and Z busses of the other devices (for a total of 12 mixes). The mixes can have crosspoint gains on the signals from the other devices. See Figure 17 below. All 12 mixes become inputs to the main matrix and can be mixed with the other inputs to create outputs 1-8, A-D, Ref 1, Ref 2, and W, X, Y, and Z bus outputs. Submatrix Bus W WB0 WB1 WB2 WB3 WB4 WB5 WB6 WB7 Bus X XB0 XB1 XB2 XB3 XB4 XB5 XB6 XB7 Bus Y YB0 YB1 YB2 YB3 YB4 YB5 YB6 YB7 Bus Z ZB0 ZB1 ZB2 ZB3 ZB4 ZB5 ZB6 ZB7 Figure 17. W, X, Y, and Z submatrices. EF Bus Reference. In a system with multiple devices, if all devices need the same echo canceller reference, one device should be designated to put its echo canceller reference (either Ref 1 or Ref 2) on the EF bus to be used as the EF Bus Reference. All other EF2280s may use the EF bus reference as the reference for their echo cancellers, or they can use their own internal references. The references may include a mix of any input, with crosspoint gains, including W, X, Y, and Z busses. NOM Bus. All busses on the EF Bus contain NOM information. See HeadingRunIn(page 31) for more information on how NOM attenuation is applied. Note. The EF Bus must be connected so that the EF BUS OUT of one EF2280 device is connected to the EF BUS IN of another EF2280. Connecting EF BUS IN to another EF BUS IN (or EF BUS OUT to EF BUS OUT) will not work. See"Connector Pinouts" on page 48 for pinout of Cat 5 cable. VORTEX EF2280 Reference Manual 24 Technical Support: 800.932.2774