Related Manuals for Digital Voice Systems VC-20-PRJ25
Summary of Contents for Digital Voice Systems VC-20-PRJ25
- Page 1 Digital Voice Systems, Inc. The Speech Compression Specialists VC-20-PRJ25 IMBE™ Vocoder Board User’s Manual Version 2.0...
- Page 2 Digital Voice Systems, Incorporated. Every effort has been made to ensure the accuracy of this manual. However, Digital Voice Systems, Inc. makes no warranties with respect to the documentation and disclaims any implied warranties of merchantability and fitness for a particular purpose.
- Page 3 END USER has requested a license, and any derivative works thereof, including modifications, enhancements and extensions made by or for Digital Voice Systems, Inc. (DVSI) and including circuit diagrams, timing diagrams, programmable logic software, logic diagrams, layouts, operating instructions and user manuals.
- Page 4 Agreement shall be limited to 20% (twenty percent) of the fees paid by END USER for the particular Voice Codec or VC-20 IMBE™ Vocoder Board which caused the damages or that is the subject matter of, or is directly related to, the cause of action.
- Page 5 Agreement shall remain in full force and effect. 12.0 Notices 12.1 Any notices to DVSI which may be given hereunder shall be in writing and sent to: Digital Voice Systems Inc., 234 Littleton Road, Westford, MA., 01886, U.S.A. DVSI Confidential Proprietary License and Warranty Page iii...
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Page 7: Table Of Contents
Figure 1 Silence / Voice Frame Signaling ...9 Figure 2 VC-20-PRJ25 Connections In Loop-Back Mode...15 Figure 3 Connections between VC-20-PRJ25 and a Modem ...16 Figure 4 Dual VC-20- PRJ25 Vocoder Board Connections ...17 Figure 5 VC-20- PRJ25 Channel Signal Timing Relationships...18 Figure 6 Run Signal Timing ...20... -
Page 9: Product Introduction
This digitized speech is then processed by the encoder and converted into a 7.2 kbps data bit stream. This bit stream is output to a modem or similar device. Simultaneously, the VC-20-PRJ25 receives a 7.2 kbps data bit stream from a modem or similar device. This received bit stream is processed by the decoder and converted into a synthetic speech signal which is then converted into an analog signal using the on-board D-to-A converter. -
Page 10: Vc-20-Prj25 Imbe™ Vocoder Operation
Connections are made to the VC-20-PRJ25 using the attached DIN 41612 connector which is described in Sections 4 and 5. The user must supply the VC-20-PRJ25 with a 5v digital power supply and a +/-5v analog power supply. It is preferable to decouple the analog supply from the digital supply by using separate power supplies. -
Page 11: Technical Specifications
VC-20-PRJ25 IMBE™ Vocoder Board User’s Manual Technical Specifications Connector: Type Physical: Description Analog Input: Type Impedance Sensitivity Sinusoidal Overload Nominal Level Dynamic Range Noise Level Analog Output: Type Impedance Sensitivity Sinusoidal Overload Nominal Level Dynamic Range Noise Level Bandwidth Digital Interface:... - Page 12 Analog Power Analog Power Output Analog Ground Ground Ground Note: Many Reserved signals are used to monitor the internal state of the VC-20-PRJ25. To ensure proper operation all reserved signals must be left unconnected. DVSI Confidential Proprietary ROW B Name Function...
- Page 13 VC-20-PRJ25 IMBE™ Vocoder Board User’s Manual VC-20-PRJ25 Connector Signals Name GND Anlg ITXD QTXD TXCK FMEN IRXD IRXD1 IRXD0 QRXD QRXD1 QRXD0 RXCK FMDE LOST RESET STATUS ENSLNCE DESLNCE VFRO VRXI RESX DINRS HD_SD FEC_OFF DVSI Confidential Proprietary Type Description...
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Page 14: Vc-20-Prj25 Connector Signal Descriptions
300ns will reset the VC-20-PRJ25. DINRS will generate RESX and RESET. The VC-20-PRJ25 will pull this signal to its inactive state (low) when it is not being driven by an external source (it may be left unconnected if not being used). - Page 15 RESX is the hard-reset signal. RESX RESX is the reset status output signal. It is active when the VC-20-PRJ25 is being reset. The VC-20-PRJ25 is reset under three conditions: during power-up, as a result of DINRS being asserted, or as a result of a Watch-Dog Timer reset. This signal is an active low output.
- Page 16 IRXD (the MSB) is read by the decoder. These signals are each clocked into the VC-20-PRJ25 on the falling edge of RXCK at 3.6 kHz. These signals combined with the in-phase data signals result in a total data rate of 7.2 kbps.
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Page 17: Figure 1 Silence / Voice Frame Signaling
VC-20-PRJ25 IMBE™ Vocoder Board User’s Manual VC-20-PRJ25 on-board jumpers Connector Signals Jumper Connects on-board 3.6 kHz data clock to TXCK Connects on-board 3.6 kHz data clock to RXCK Connects on-board 20 ms frame clock to FMEN Connects on-board 20 ms frame clock to FMDE... -
Page 18: Chapter 2 Technical Drawings
VC-20-PRJ25 IMBE™ Vocoder Board User’s Manual Chapter 2 Technical Drawings (jumper 1) (jumper 3) (jumper 12) (jumper 4) (jumper 2) Figure 2: Vocoder Connections in Loop back Mode DVSI Confidential Proprietary On-Board Clock & Frame Generator TXCK FMEN ENCODER ENSLNCE... - Page 19 VC-20-PRJ25 IMBE™ Vocoder Board User’s Manual Note: Not meant to represent an “off-the-shelf” modem MODEM Figure 3: Connections between Vocoder and a Modem DVSI Confidential Proprietary TXCK FMEN ITXD,QTXD ENSLNCE HD_SD, ECHO, VAD IRXD, IRXD1, IRXD0 QRXD, QRXD1, QRXD0 DESLNCE...
- Page 20 VC-20-PRJ25 IMBE™ Vocoder Board User’s Manual DECODER VFRO ENCODER VFXI On-Board Clock & Frame Generator DVSI Confidential Proprietary (jumper 1) (jumper 3) LOST (jumper 11) RXCK FMDE DESLNCE (jumper 12) IRXD,QRXD ITXD,QTXD HD_SD, ECHO, VAD HD_SD, ECHO, VAD IRXD,QRXD ITXD,QTXD...
- Page 21 VC-20-PRJ25 IMBE™ Vocoder Board User’s Manual 500 ns. TXXK FMEN QTXD, ITXD, 500 ns RXCK FMDE QRXD, IRXD QRXD1, IRXD1 QRXD0, IRXD0 LOST, DESLNCE, HD_SD Figure 5: Channel Interface Timing Relationships DVSI Confidential Proprietary 1/rate (seconds) 20 ms 1/rate (seconds) 20 ms Section 4 –...
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Page 22: Figure 6 Run Signal Timing
VC-20-PRJ25 IMBE™ Vocoder Board User’s Manual Figure 6: RUN Signal Timing DVSI Confidential Proprietary 20ms 12.5ms Encoder Window Section 4 – Technical Drawings 7.5ms Decoder Window Page 14... -
Page 23: Figure 2 Vc-20-Prj25 Connections In Loop-Back Mode
VC-20-PRJ25 IMBE™ Vocoder Board User’s Manual 5.5 mm 3.0 mm 11 mm < 7.5 mm Figure 7: Vocoder Physical Dimensions DVSI Confidential Proprietary 41612 Connector 100 mm (bottom view) 112 mm (components < 12.5 mm) (connections < 2 mm) (side view) Section 4 –... -
Page 24: Chapter 3 Dvsi Support Services
VC-20-PRJ25 IMBE™ Vocoder Board User’s Manual Chapter 3 DVSI Support Services Technical Support If you have any problems with the VC-20-PRJ25 IMBE™ Vocoder Board or have questions about its operation, please contact: Digital Voice Systems, Inc. 234 Littleton Road Westford, MA 01886 USA... -
Page 25: Figure 4 Dual Vc-20- Prj25 Vocoder Board Connections
NOTES Page 17 DVSI Confidential Proprietary...
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