AT895 Adaptive-array Microphone Systems New Technology Enhances Audio Acquisition Unique, groundbreaking optimization of acoustic, analog and digital design produces unmatched directional performance, operating versatility and ease of use. AT895/MK Mount Kit AT895/RK Remote Kit Installation and Operation AT895 Adaptive-array Microphone Systems Installation and Operation Warning: Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. Introduction Thank you for choosing an AT895 Adaptive-array Microphone System. AT895 Systems incorporate a revolutionary DSPcontrolled five-element microphone array that provides adaptive directional audio acquisition. Utilizing Audio -Technica's proprietary DeltaBeamTM technology, the AT895 System manipulates and filters the output of the array by acoustical, analog and digital means. This process enhances the pickup of a sound source from a desired direction relative to unwanted background noise or interference, providing cancellation of up to 80 dB. Other benefits include minimized audibility of proximity effect, minimized nearfield effect on the low-frequency directionality of the array, and markedly reduced susceptibility to mechanical noise, wind noise and racking as compared to currently-available professional microphones. The AT895 functions equally well for handheld interview use or long-range sound pickup ­ in the field, in the studio, or in security operations. Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: · Reorient or relocate the receiving antenna. · Increase the separation between the equipment and the receiver. · Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. · Consult the dealer or an experienced radio TV technician for help. AT895 vs. Typical Shotgun Performance Compare acceptance angles (at 3 dB down): Microphone 200 Hz 400 Hz Shotgun 60° 60° AT895 20° 20° Compare polar patterns at 200 Hz: Microphone 200 Hz Rejection at 90°/270° Shotgun 15 dB AT895 70 dB 1 kHz 60° 20° 2 kHz 50° 20° 4 kHz 30° 60° 8 kHz 20° 50° Compare maximum off-axis rejection: Microphone Maximum Off-axis Rejection Shotgun 30 dB AT895 80 dB Compared to typical performance of a professional-quality 15.5" line + gradient microphone (measurement conditions: 1Pa at 0.5 m). Due to the adaptive nature of its digital processing, AT895 performance in actual field conditions will vary with the environment encountered. Incorporated in the AT895 design are: DSDA-PROTM software (U.S. Patent No. 5,825,898) by Lamar Signal Processing, Ltd., a wholly-owned subsidiary of Andrea Electronics Corporation; DeltaBeamTM (U.S. Patent pending) and MicroLine® technologies by Audio-Technica. "DSDA-PRO" is a trademark of Lamar Signal Processing, Ltd.; "DeltaBeam" is a trademark of and "MicroLine" is a registered trademark of Audio-Technica. 2 The Basic System Model No. "AT895" at "Top" No ribs on "Top" and "Bottom" Fig. A AT895 Microphone Ribs on "Sides" AT895 Microphone The AT895 Microphone itself is "all analog," housing one Audio -Technica MicroLine® element, four A-T cardioid elements mounted in a co-planar diamond configuration, and five mic preamps. The five amplified analog signals from the microphone elements are sent individually down a special detachable cable to the AT895CP Control Pack. AT895CP Control Pack The AT895CP Control Pack provides all the power, Digital Signal Processing, and control for the AT895. Output from the Control Pack is analog at mic-level (­23 dBV). The lightweight, sturdy metal housing accepts a quick-change, click-on Battery Housing for totally self-contained operation, if desired. The Control Pack also operates on external 12-14V DC -- from an Anton/Bauer or similar-type battery source, or from an AC adapter -- via an industry-standard 4-pin XLR-type connection. Control features on the AT895CP are: · Three-position Mode (pickup pattern) switch which provides Full-field Adaptive ( ) Planar-adaptive ( ) and Line + Gradient ( ) settings. (See page 5 for a full explanation of the Mode settings). · Audio filter switch with Flat, High-pass and Band-pass settings. · Monitor headphone jack with volume control. · LCD battery condition indicator. · Power switch with LED indicator. Two System Configurations The AT895 is available as the AT895/RK "Remote Kit" for field use, and as the AT895/MK "Mount Kit" for studio and fixed-install applications. AT895/RK Remote Kit includes: · AT895MIC · AT895CP · AT895BH · AT895PG · AT895Z · AT895C-10 · AT895CC Adaptive-array Microphone Control Pack with attached belt clip Click-on Battery Housing Pistol-grip shock mount Zeppelin-type windscreen Special 6-conductor shielded Cable, 10' long Carrying Case · AT895FBK All components and accessories are interchangeable and available separately to augment systems or to use as "field spares." In addition, two accessory kits are available: · AT895CK Conversion Kit adds the components needed for an AT895/MK system to function as an AT895/RK system. Fisher Boom Kit permits use of the AT895 on a Fisher boom. (See page 7 for a complete listing of available system components and accessories.) The AT895 Microphone and Control Pack are designed to operate as a system only. Do not attempt to use these components with other devices. AT895/MK Mount Kit includes: · AT895MIC · AT895CP · AT895SC · AT895PS1 · AT895C-25 Adaptive-array Microphone Control Pack Shock-mount Stand Clamp with 5/8" - 27 threaded stud Multi-input AC Power Supply with "120V" IEC detachable power cord Special 6-conductor shielded Cable, 25' long 3 AT895CP Controls and Functions 3 5 6 8 9 10 1 2 4 7 Fig. C Control Pack Rear Panel Fig. B Control Pack Front Panel Front Panel Controls and Functions (Fig. B) 1. MONITOR: 1/4" (6.3 mm) Monitor headphone jack; TRS type with signal on both Tip and Ring. 2. MONITOR LEVEL: Monitor headphone level control. 3. FILTER SWITCH: 3-position switch offers Flat ( High-pass ( ) and Band-pass ( ) settings. ), Rear Panel Functions (Fig. C) 8. BALANCED AUDIO OUTPUT JACK: 3-pin XLRM-type connector. Output is analog; the balanced signal appears across Pins 2 and 3. Output phase is "Pin 2 hot;" positive acoustic pressure produces positive voltage at Pin 2. Pin 1 is ground (shield). A standard 2-conductor shielded cable (not included) can be used to connect the AT895CP output to the associated electronics. Phantom power cannot be used, but if present will have no effect on the Control Pack. 9. DC POWER INPUT: 4-pin XLRM-type connector for an external 12-14V DC source from an Anton/Bauer or similar battery supply, or from an AC adapter. Wiring is industry-standard: V­ on Pin 1, V+ on Pin 4, no connection to Pins 2 or 3. 10. MIC INPUT JACK: 7-pin XLRM-type connector accepts the special AT895C 6-conductor shielded cable used to connect the AT895 Microphone to the Control Pack. 4. MODE (PICKUP PATTERN) SWITCH: 3-position switch offers Full-field Adaptive ( ) , Planar-adaptive ( ) and Line + Gradient ( ) settings. (See page 5 for a full explanation of the Mode settings.) 5. LCD BATTERY CONDITION INDICATOR: Markers disappear as power remaining decreases. Functions only during 9V battery operation using the AT895BH. 6. POWER LED INDICATOR: Lights red when power is on. 7. POWER SWITCH: On/off switch controls DC power from all sources. 4 Mode (Pickup Pattern) Settings Model No. "AT895" at "Top" 1 4 3 2 MicroLine® Fig. D AT895 Microphone Elements The microphone array in the AT895 consists of one Audio -Technica MicroLine ® element and four A -T cardioid elements mounted in a co-planar diamond configuration. A switch on the AT895CP Control Pack selects from three Mode (pickup pattern) options: two "adaptive" modes and one "non-adaptive" mode. In the adaptive modes, signals from the MicroLine® element and either one pair (labeled 1 & 2 in Fig. D) or both pairs (1 & 2, 3 & 4) of the "corrective" cardioid elements are utilized. These signals are processed in the Control Pack by both analog and digital means to provide continuouslyadapting rejection of off-axis sounds. This means that as the off-axis soundscape changes (either in intensity or directionality) the microphone system compensates for those changes. Even off-axis wind is interpreted as unwanted noise, and is suppressed. Full-field adaptive Mode ( ) The Full-field adaptive mode provides the maximum directionality and off-axis rejection. Signals from the MicroLine® element and both pairs of cardioid elements are utilized. Planar-adaptive Mode ( ) In the Planar-adaptive mode, signals from the MicroLine® element and only the "vertical" pair of cardioid elements (1 & 2) are utilized. The resultant "elliptical" pickup pattern provides optimum rejection in one plane (tighter vertically, wider horizontally). Understanding the correct orientation of the microphone is crucial for effective application of the Planar-adaptive mode. When the microphone is positioned with the Audio -Technica logos along the sides of the mic handle and the "AT895" on the name ring is "up" (as shown above and in Fig. A on page 3), maximum off-axis rejection occurs in the vertical plane of the pickup pattern only, while the horizontal pickup is nonadaptive. This produces a "horizontal ellipse" pickup pattern. (Of course, if the microphone is rotated 90 degrees, so the logos are at the "top" and "bottom" of the handle and the AT895 name ring marking is "sideways," the resulting pattern would be "tall" and adaptively "narrow.") Line + Gradient Mode ( ) The Line + Gradient mode is non-adaptive, with only the signal from the MicroLine® element being utilized. (The cardioid elements and the adaptive circuitry are still functioning, but the "correcting" signals are not applied to the MicroLine® element's signal.) 5 Power Sources The AT895CP Control Pack may be powered three different ways: · From an AC adapter, using an industry-standard 4-pin XLR connection. (An AC power supply with 9V DC output is included in the AT895/MK System). · From an Anton/Bauer or similar-type external 12-14V battery source. · From three 9V batteries in a click-on AT895BH Battery Housing (included in the AT895/RK System) for completely self-contained operation. AT895Z Zeppelin-Type Windscreen The two sections of the AT895Z Zeppelin-type windscreen bayonet-latch together. To open the windscreen, rotate the rear section to the left (counter-clockwise, viewed from the rear), then pull the sections apart. Place the "nose" of the microphone in the foam recess provided in the front section. Slide the rear section of the windscreen over the handle of the mic until it reaches the front section, making certain the mic's "nose" remains in its foam recess. Engage the bayonet lugs on the windscreen and rotate the rear section fully to the right (clockwise). Once installed, the windscreen may be rotated on the microphone if desired. AT895BH Battery Housing Battery Selection and Installation Always use fresh alkaline or lithium 9V batteries. For greatest reliability and longest operation, replace all three batteries at the same time, using identical types. To open the battery tray, press down firmly on the tray release button until it clicks; then lift the tray slightly and slide it out. Insert three batteries, observing polarity as marked inside the battery compartment. Slide the battery tray closed, making certain it clicks shut. Due to current requirements of the system, always use three batteries. Attaching the Battery Housing to the Control Pack Slide the Battery Housing onto the Control Pack. When it is fully seated, the two release buttons at the bottom of the Battery Housing will click into place. To remove the Battery Housing, simultaneously push both release buttons while sliding it down and off the Control Pack. The Battery Housing may be in place when external power is used. The batteries will still be consumed, but at a slower rate, depending upon the external voltage. The batteries will also provide "back-up power" in case of external supply interruption. AT895PG Pistol-Grip Shock Mount For correct ba ...