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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Mic 2 of the Voicecrafter is capable of accepting a signal from an external microphone mixer. (If sound reinforcement of local mics is desired, refer to paragraph 7. 4. ) 7. 2. 1 INSTALLATION The Mic 2 input must be configured for a line level input. 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. 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). 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. 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. Click the Train button (ACOUSTIC screen) and click on F3 when prompted, to begin a Configuration Train cycle. Once acceptable training responses have been achieved (see paragraph 4. 3), store the resulting configuration by clicking on the Store button (ACOUSTIC Screen) followed by the desired memory location (F1~F5). CONNECTING EXTERNAL EQUIPMENT 7. 3 EXTERNAL AMPLIFIER WITHOUT LOCAL REINFORCEMENT The Voicecrafter has a line level audio output that is capable of driving external power amplifiers. [. . . ] Non-Linear Processor (NLP) - Device providing cancellation of residual echo on the outgoing conference signal. Tail Length - The amount of time it takes for a signal to propagate from the echo canceller receive out port, and return back to the send in port, as an echo. Transmission Delay - The amount of time for a signal to travel from a far end site to a near end site. 11. 2 GENERAL INFORMATION ACRONYMS, ABBREVIATIONS AND SYMBOLS Amperes Acoustic Echo Return Loss Application Specific Integrated Circuit Auxiliary Bandwidth Clear Central Processing Unit Digital Signal Processor Disable Department of Commerce Echo Canceller Echo Canceller Receive Input Echo Canceller Send Input Echo Canceller Send Output Enable Equalization Echo Return Loss Enhancement Federal Communications Commission Procecessor Send A AERL - ASIC - AUX BW - CLR CPU DSP DIS - DOC EC EC_Ri EC_Si EC_So ENA EQ - ERLE - FCC - NLP_So Non-Linear Output 29 VOICECRAFTERTM HHT Hz LED kHz Hand-Held Terminal Hertz Light Emitting Diode Kilohertz Milliseconds Non-Linear Processor Personal Computer Random Access Memory RCV SND V - GENERAL INFORMATION Receive Send Volts Volts Direct Current Watts Ohms VDC W - mSec NLP PC - RAM - 30 WARRANTY BIAMP SYSTEMS IS PLEASED TO EXTEND THE FOLLOWING 5-YEAR LIMITED WARRANTY TO THE ORIGINAL PURCHASER OF THE PROFESSIONAL SOUND EQUIPMENT DESCRIBED IN THIS MANUAL.       ! [. . . ]