AUDIOPHILE Hardware User`s Manual
Contents
1. is coupled to the input circuitry NOTE for proper connection of the input signal please make sure that the signal pair whether balanced or single ended is connected to the and pins on the connector otherwise the signal will not couple properly through the transformer to the internal circuitry The G ground pin is normally left unconnected for maximum common mode noise rejection but it is available as a backup connection for a shield conductor in the event that the signal source does not have a suitable ground connection available for this purpose 7 E A O Figure 2 TEL LINE IN Receiver Conceptual Diagram The TEL LINE OUT is a 3 pin Phoenix type connector with removable terminal strip plug that provides balanced line level output of a single monaural audio signal from the AUDIOPHILE processor The output circuitry is 600 ohm transformer coupled and is designed to be compatible with both wet and dry pair telephone line connections in addition to normal line level audio signal inputs to audio recording equipment amplifiers etc Refer to Figure 3 for a conceptual diagram of how the audio output circuitry is coupled to the rear panel output connection NOTE for proper connection of the output signal please make sure that the signal pair is connected to the and pins on the connector otherwise the signal will not couple properly through the transformer from the inte2. range 5 3 Digital Control Interface e USB 2 0 full speed interface e 5 pin mini B connector e Allows custom configuration via the supplied Windows software and interconnect cable 12 LED Indicators e POWER on LED only Bandwidth e 35Hz to 7 5kHz 18kHz sample rate Processing Q 18kHz Sample Rate e Single precision floating point processing of 24 bit audio data 24 bit result audio e Multi stage noise reduction filtering including o DualFIR filter stages each configurable as LMS adaptive filter 512 taps maximum comb lowpass highpass bandpass bandstop notch or slot filter o Adaptive spectral subtraction stage for random broadband noise reduction o Equalizer stage configurable as adaptive spectral inverse filter ASIF or graphic equalizer Automatic Crash Detect and reset for all adaptive filtering Look ahead AGC for compensation of near far party and low level audio signals e Automatic voice detection module applied to filtered output o Upto 2 seconds pre detection and 13 seconds post detection for any detected voice signal allowing a maximum guard band of 15 seconds for any detected speech o Infinitely retriggerable guaranteeing continuous recording if speech detected at least once each guard band period o Standard C Tone output 852 1633 dual tone whenever VOX active C Tone selected and speech not present e Signal flow from input to output as follows o Noise reduction filt
3. 1 Introduction AUDIOPHILE is a specially designed compact processor unit that provides both real time noise reduction processing and voice detection capabilities for applied live or recorded signals Designed for either rack mount or stand alone usage this powerful signal processor is fully self contained and features e Compact size at 1 1 W x 2 8 H x 6 0 D o Extruded aluminum enclosure with black anodized panels o Optional 2U x 19 rackmount panel capable of supporting as many as 14 AUDIOPHILE units e Transformer and AC coupled 600 ohm balanced audio inputs and outputs utilizing two piece Phoenix terminal connectors suitable for direct connection to most audio and telco equipment e Low noise analog circuitry and 24 bit professional grade audio codec for high performance audio throughput and digital filtering e Latest technology Texas Instruments floating point DSP e Multi stage LMS adaptive adaptive spectral inverse ASIF adaptive spectral subtraction and automatic gain control AGC processing e Smart VOX algorithm operating directly on the filtered audio signal o When VOX active either standard C Tone output or silence whenever speech not present e Standard 7 5kHz audio bandwidth 18000 Hz sample rate e 9 18VDC power input e Front panel switches for controlling filtering VOX and C Tone or silence selection e Interactive Windows software operating through the front panel USB connection and allowing complete configurati
4. AUDIOPHILE Front End Audio Processing and Voice Detection System oo E C POWER FILTER TEL IN Mlour E Em VOX G IN Ml oUT C SIL TEL TONE M ENCE LINE MONITOR PRE Post ar Oo 9 18 VDC _ kd USB E ee O J HARDWARE USER S MANUAL Digital Audio Corporation a DRI company 4018 Patriot Drive Suite 300 Durham NC 27703 AUDIOPHILE Front End Audio Processing and Voice Detection System Hardware User s Manual March 15 2006 Document Number 060315ADT Digital Audio Corporation a DRI company 4018 Patriot Drive Suite 300 Durham NC 27703 Phone 919 572 6767 Fax 919 572 6786 sales dacaudio com www dacaudio com Copyright 2006 by Digital Audio Corporation All rights reserved TABLE OF CONTENTS IRR ONA E RAAI T a 4 SM is Pe ro ja ERR 4 1 2 Original Factory Configuration ccccccccccccccccccncnncnnnnnnnnnnnnnononnnnnnnnnnnnnnnnnnnnnnnnnnnnns 4 1 3 Custom Filter Configuration conce 5 ZWOPERATIONF Eee oe le Se tot a ada Lando es 6 2 1 Controls and Connectors sese eire eee D Mee aM OIG Ee AN Merch hc tg tg lg ci cg ee cae india 6 2 12 Rear Panel AA O A ee aes 7 2 2 Signal PROCESSING Fe lOW tit 10 4 0 CALIBRATION AND SERVICE iet ea 11 5 0 AUDIOPHILE SPECIFIGATIONS sales cade an Un tene Uem ens T2 5 1 IU PM 12 5 2 Analog mails 12 A E BAR 12 A LAM A RE 13 1 0 OVERVIEW 1
5. and Connectors X O POWER FILTER IN M ouT IN M OUT o M SIL ENCE MONITOR PRE Ill PosT Figure 1 AUDIOPHILE Front and Rear Panels 2 1 1 Front Panel Refer to Figure 1 for an illustration of the front and rear panels The POWER LED indicates that DC power is applied to the rear panel connector and that the unit is operating NOTE there is no power on off switch the unit is always on whenever power is applied The two position FILTER IN OUT switch selects the state of the noise reduction processor filter stages To have the AUDIOPHILE process filter the input signal flip the switch left to IN To have the AUDIOPHILE bypass the two filter stages no filter flip the switch right to the OUT position The two position VOX IN OUT switch selects the state of the speech detecting smart VOX algorithm To make the VOX active flip the switch left to IN To make the VOX inactive flip the switch right to the OUT position Whenever the VOX is IN the second two position slide switch selects either C TONE or SILENCE to replace the non speech portions of the output audio routed to the TEL LINE OUT connector so as to indicate to the subsequent recording equipment which portions should not be recorded NOTE changing the setting on either the FILTER or the VOX switches will affect the audio output from the TEL LINE OUT connector This may affec
6. ers o VOX stage o AGC stage e Interactive USB communication with Windows software allowing user configuration of the processing e Programming of filter configuration into internal non volatile memory e Robust servicing of front panel switches when USB not connected 5 4 Physical e 1 1 W x 2 8 H x 6 07D extruded aluminum chassis approximately 1 Ib e Black painted case black anodized front and rear panels e Optional 2U x 19 rackmount kit suitable for mounting up to 14 AUDIOPHILE units vertical mounting 13 14
7. nal flow path The VOX is switched in and out separately NOTE there is no input level adjustment required the AUDIOPHILE is set to a fixed input level that offers maximum input dynamic range 10 4 0 CALIBRATION AND SERVICE The AUDIOPHILE is designed to make periodic calibration unnecessary 11 5 0 AUDIOPHILE SPECIFICATIONS 5 1 Power 9 18VDC input e 2 pin Phoenix jack 0 2 pin spacing e Accepts regulated or unregulated power within specified range e Universal AC power adaptor with compatible plug supplied 5 2 Analog Analog Input e 3 pin Phoenix jack 0 2 pin spacing compatible screw terminal plug included e 2Vims maximum input voltage e Fixed gain amplifier nominal OdB pass through from input to output e Zin 6000 AC coupled e Transformer coupled balanced signaling suitable for connection to either audio or telco equipment Analog Output e 3 pin Phoenix jack 0 2 pin spacing compatible screw terminal plug included e 2Vims maximum output voltage e Zout 6000 AC coupled e Transformer coupled balanced signaling suitable for connection to either audio or telco equipment Headphone Jack e 3 5mm stereo mini jack headphones not included e 1Vims maximum output voltage e Automatic level control only applied to headphone jack not analog output e Selector switch for PRE or POST audio filter listening Analog Conversion e 24 bit 256x oversampling sigma delta codec e gt 90dB SINAD gt 100dB dynamic
8. on of all processing and voice detection parameters e Internal flash memory storage of all processing and voice detection parameters 1 2 Original Factory Configuration The original factory configuration stored in the AUDIOPHILE unit is optimized for noise removal and clarification of typical live and recorded voice signals It is also optimized for detecting embedded voice in most typical audio signals The factory configuration consists of a combination of LMS adaptive filtering for machinery or other predictable broadband noise reduction spectral subtraction filtering for static or other random broadband noise reduction automatic spectral inverse filtering for spectral equalization and voice intelligibility improvement automatic gain control for near far party volume compensation and smart VOX voice activity detection 1 3 Custom Filter Configuration e For non typical situations the flash memory configuration can easily be modified through the front panel USB port using the Windows software utility The software also includes the factory configuration as one of its standard options so that the original state of the AUDIOPHILE can be restored at anytime Please refer to the AUDIOPHILE Configuration Software User s Manual for further details on using the Windows software utility 2 0 OPERATION AUDIOPHILE is easy to setup and operate The following section discusses the connections and controls for the unit 2 1 Controls
9. rnal circuitry In the case of a balanced pair connection the G ground pin can optionally be connected to the shield conductor that may be available in the cable In the case of single ended and or coaxial cable connections the G and pins should both be connected to the shield ground conductor with the pin connected to the signal conductor RING 25 de Figure 3 TEL LINE OUT Driver Conceptual Diagram The 9 18 VDC power input connector is a 2 pin Phoenix type connector with removable terminal strip plug The supplied universal AC adaptor connects to this jack but alternatively power can be supplied from any DC source in the range of 9 18VDC that has sufficient current available for powering the AUDIOPHILE electronics 1 Ampere minimum supply current recommended NOTE there is no power on off switch the unit is always on whenever power is applied 2 2 Signal Processing Flow It is important to understand how audio flows through the AUDIOPHILE system Please refer to Figure 4 for the functional block diagram Filter 1 Filter 2 Spectral LMS LMS Subtraction TEL LINE PRE POST TEL LINE C TONE Input Selection Output SILENCE Source Headphones postres Figure 4 AUDIOPHILE Functional Block Diagram Not shown in the diagram are the FILTER IN OUT and VOX IN OUT switches the FILTER switch allows switching all the processing except for the VOX in and out of the sig
10. t any subsequently connected recording equipment The MONITOR PRE POST switch specifies whether the original input audio from the TEL LINE IN connector PRE process or the final output audio to the TEL LINE OUT connector POST process is routed to the stereo headphone jack for listening In either position the audio output from the TEL LINE OUT connector will be unaffected NOTE in the PRE position the audio heard on the headphones will not be affected by the other three switches Make sure to select POST if you are trying to hear the result of the FILTER and VOX settings The USB port is used to download new settings for the FILTER and VOX processing The supplied Windows software and cable are required to perform this function Please refer to the AUDIOPHILE Configuration Software User s Manual for further details on using the software 2 1 2 Rear Panel Refer to Figure 1 for an illustration of the front and rear panels The TEL LINE IN is a 3 pin Phoenix type connector with removable terminal strip plug that provides balanced line level input of a single monaural audio signal to the AUDIOPHILE processor The input circuitry is 600 ohm transformer coupled and is designed to be compatible with both wet and dry pair telephone line connections in addition to normal line level audio signals from audio recording equipment amplifiers etc Refer to Figure 2 for a conceptual diagram of how the rear panel input connection
Download Pdf Manuals
Related Search