User manual BIAMP VOICECRAFTER

[. . . ] ADVANTAGE® VOICECRAFTER and VOICECRAFTER Plus Acoustic Echo Cancellers Operation Manual ® Biamp Systems, 10074 S. W. Arctic Drive, Beaverton, Oregon 97005 U. S. A. (503) 641-7287 http://www. biamp. com Feb 1/00 an affiliate of Rauland Borg Corp. blankVOICECRAFTER and VOICECRAFTER Plus TABLE OF CONTENTS Front & Rear Panel Features Software Control TTC Control Configuration Calibration Option Connecting External Equipment RS232 Applications Troubleshooting Third-party Control Specifications & Block Diagram Warranty pgs. 21 INTRODUCTION ADVANTAGE® VOICECRAFTER and VOICECRAFTER Plus are tamper proof Acoustic Echo Cancellers, which provide full-duplex speech between 2 or more locations in video or teleconferencing applications. [. . . ] The use of a Sound Pressure Level Meter is STRONGLY recommended. Adjust the trim control on the rear panel of the VOICECRAFTER, and/or the external mixer output, so that the Channel 2 peak LED is lit with the white noise on (or speech if SPL meter isn't available), then back the trim control off until the trim LED goes off. Look in the Averages section of the Control Software and view the EC_Si section. This value is automatically updated every 2 seconds. Adjust the Channel 2 Gain (VOICECRAFTER software) so that the average EC_Si is approximately -20dB. Select ­10dB on the Main Output's pull-down menu. Turn on the white noise again, measure the AERL in the Averages section of the Control Software. This number should be a positive number between +2dB and +20dB. Click on the Train button bringing up a train menu. Using the pull-down menu set the Target AERL to the same value as measured. Click on the Config button at the bottom of the train screen to begin a Configuration Train Cycle. The VOICECRAFTER will use white noise to perform the Configuration Train Cycle. Hint: If a SPL meter is not available, adjust the speaker level for a comfortable listening level in the room (still using white noise). Hint: If the measured AERL is not between +2dB and +20dB, adjust the level of the amplifier either up or down. Increasing amplifier level will lower AERL, and decreasing amplifier level will increase AERL. Training results will be displayed in the training menu by clicking the `OK' button on the `Training Done' screen. Once acceptable training responses have been achieved (AERL within +/-2dB of set target, and ERLE >7 see hints below) set AutoAdaptation to Fully Enabled, store the resulting configuration by clicking on the Store button followed by the desired memory location on the `popup' menu. The VOICECRAFTER will power up into the mode stored into the Preset 1 location. Presets 2~5 can be used to store room configurations for different rooms (roll about applications), or different room configurations where mics and speakers are moved around. Hint: If training results are not achieved adjust AERL target +/-2dB depending on direction of white noise adjustment during Configuration train. Example: During a train, if white increases, increase AERL target by 2dB. If white noise decreases during train, decrease AERL target by 2dB. [. . . ] If advance notice is not practical, the telephone company will notify the customer as soon as possible. Also, you will be advised of your right to file a complaint with the FCC if you believe it is necessary. The telephone company may make changes in its facilities, equipment, operations, or procedures that could affect the operation of the equipment. If this happens, the telephone company will provide advance notice in order for you to make the necessary modifications in order to maintain uninterrupted service. [. . . ]