User manual BIAMP VC3000 SERIES

[. . . ] VOICECRAFTERTM 3000 Series Echo Canceling Audio System operation manual ®    !" #$% & '(()))* VOICECRAFTERTM TABLE OF CONTENTS TABLE OF CONTENTS 1. FRONT PANEL FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 REAR PANEL FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Use F3 to select Line Input (Balanced or Un-balanced depending on mixer used). The output of the external mixer should be connected to the Voicecrafter Mic 2 input (+ to pin 3, - to pin 2, and ground to pin 1) using 2-conductor shielded cable. Microphones are then connected to the inputs of the external mixer. Adjust the level of the noise source so that the sound pressure level at the microphone is 72dB. If the Voicecrafter is being used as the white noise source, the noise level can be adjusted by clicking AutoAdapt (ACOUSTIC screen) and using F3 to select FULLY DISABLED. Then click on the Speaker Gain button and use F2 and F3 to adjust gain levels. To do this: click on the DSP AVE button 15 7. 2. 2 CALIBRATION The external mixer needs to be calibrated for the nominal level expected at the Mic 2 input of the Voicecrafter (VC3000 & VC3010 = -35dBm; VC3001 & VC3011 = 0dBm). Use the following procedure to calibrate the external mixer: 1. Apply power to the Voicecrafter and the external mixer. If Voicecrafter should attempt to train, wait for train cycle to complete before continuing. Use a white/pink noise source to direct noise at one of the microphones. The Voicecrafter white noise generator may be used for this calibration. To enable the internal white noise generator, click on the Noise button (ACOUSTIC screen) and use F3 to set white noise to ENA (enable). Use a sound pressure level meter to measure the noise level at the microphone. VOICECRAFTERTM (ACOUSTIC screen). EC_Si is a momentary reading, and is only updated by clicking DSP AVE again. Adjust the external mixer output for nominal level (see paragraph 7. 2. 2). Then adjust Mic 2 Gain (ACOUSTIC screen) so that the average EC_Si is approximately -20dB. Repeat steps 2~5 for all mics in the installation. Once Mic 2 Gain is established, level adjustments should be made only at the individual inputs of the mixer. After all mics are calibrated, click on Mic 2 Default Gain and use F2 and F3 to make Mic 2 Gain equal Mic 2 Default Gain. If the Voicecrafter is being used as the white noise source, click on Noise and use F3 to set white noise to DIS (disable) Then set Autoadapt back to FULLY ENABLED. If an external amplifier is to be provided, as well as an external mixer, refer to paragraph 7. 3. [. . . ] %# ?# %5 = 7% 7 6: . 8 66 . %5 = 7% > / . 6/# % > 6 /+6 66 6/ = 7% . 8 +57%6% 7/ 8%7 8. %5 5 7 566 %5 : +5 2 . 6 7/ >+6:- / =%5 +% %. 7 /8+%- . /:+%# %5 ;7%& 6. & /% :%. [. . . ]