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Digital Voice Systems, Inc.

The Speech Compression Specialists

VC-20™ Serial Speech Data Interface

Application Note

Version 1.2

Nov, 2002

VC-20

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Serial Speech Data Interface

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Summary of Contents for VC-20

Page 1: ...Digital Voice Systems Inc The Speech Compression Specialists VC 20 Serial Speech Data Interface Application Note Version 1 2 Nov 2002 VC 20 Serial Speech Data Interface ...

Page 2: ...makes no warranties with respect to the documentation and disclaims any implied warranties of merchantability and fitness for a particular purpose Digital Voice Systems Inc shall not be liable for any errors or for incidental or consequential damages in connection with the furnishing performance or use of this manual or the examples herein The information in this document is subject to change with...

Page 3: ...a written notification of the transfer and provided that the third party agrees in writing to accept all the terms and conditions of this agreement Upon any such transfer END USER s rights under this Agreement shall terminate pursuant to Section 3 0 b END USER may relocate the Voice Codec and the subsequent location shall then be considered the Designated Site c Except as provided in this Section ...

Page 4: ...hts and END USER may have other rights which vary from state to state 8 0 Limitation of Liability 8 1 In no event shall DVSI be liable for any special incidental indirect or consequential damages resulting from the use or performance of the Voice Codec or VC 20 Vocoder Board whether based on an action in contract tort including negligence or otherwise including without limitation damages for loss ...

Page 5: ...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 The encoder and decoder are fully asynchronous The VC 20 vocoder board is designed to use an Analog Devices AD28msp02 codec during normal operation This normal configuration can be modified so that the onboard codec is disabled and the 16...

Page 6: ...ut be zero mean at an average level of 22dbm0 Note The maximum sinusoidal input 32767 corresponds to 3 17 dBm0 FSR FSX The data input and output framing signals must come at a frequency of 8kHz and have a duration of one cycle of SCLK These two signals must come from the same source see Section 5 Example Configuration As outlined below FSX must be tri stated when SP_RDY is low to avoid multiple dr...

Page 7: ...on Name 1 2 3 4 5 6 Output DX 7 Output SP_RDY Input FSX 8 9 Input SCLK 10 11 Input DR 12 Input FSR 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 SEE VC 20 Users Manual SEE VC 20 Users Manual See corresponding VC 20 Manual for remaining pin out of Rows A and C Note Input INPUT to the VC 20 Output OUTPUT from the VC 20 VC 20 Serial Speech Data Interface page 7 ...

Page 8: ...5 Example Configuration VC 20 External Codec SYNC CLK DI DO SP_RDY C7 FSX B7 FSR B12 SCLK B9 DX B6 DR B11 Tri state Driver 6 Timing Diagrams Burst Mode 128kHz SCLK 5 16 MHz SCLK FSX FSR DX DR LSB MSB ...

Page 9: ...kHz SCLK FSX FSR DX DR LSB MSB 7 DVSI Technical Support If you have any problems with the VC 20 or have questions about its operation please contact Digital Voice Systems Inc 234 Littleton Road Westford MA 01886 Phone 978 392 0002 Fax 978 270 8866 email info dvsinc com web www dvsinc com VC 20 Serial Speech Data Interface page 9 ...

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