Digital Voice Systems VC-20 Installation and operating instructions

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

VC-20- Serial Speech Data Interface
The Speech Compression Specialists
DIGITAL VOICE SYSTEMS, INC.
VC-20™ Serial Speech Data Interface
Application Note
Copyright , 2002
Digital Voice Systems, Inc
234 Littleton Road
Westford MA 01886
This document may not, in whole or in part be copied, photocopied, reproduced, translated, or reduced to any electronic
medium or machine readable form without prior consent in writing from 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. 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 without notice.
Trademarks
VC-20is a trademark and AMBE® is a registered trademark of Digital Voice Systems, Inc. Other product names
mentioned may be trademarks or registered trademarks of their respective companies and are the sole property of their
respective manufacturers.
All Rights Reserved
Data subject to change
VC-20™ Serial Speech Data Interface

License and Warranty
The Speech Compression Specialists
DIGITAL VOICE SYSTEMS, INC.
VC-20™Vocoder Board END USER License Agreement
1.0 Preliminary Statements and Definitions
1.1 "Voice Codec" shall mean the hardware, software and
associated documentation referred to in the invoice or shipping papers
accompanying this agreement for which 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.
1.2 "AMBE™ Software" shall mean the speech coding software
and/or firmware provided as part of the Voice Codec. This software is
contained in the Read Only Memories (ROMS, EPROMS, EEPROMS,
etc...) which are included as part of the Voice Codec. This software
includes any derivative works which have as their source the software
contained in the Read Only Memories, and it includes the software
contained in any future Read Only Memories which DVSI may provide
END USER for use in the Voice Codec.
1.3 "Designated Site" shall mean the location of the Voice Codec.
1.4 "Proprietary Information" shall mean the information which
DVSI desires to protect against unrestricted disclosure or competitive
use and which is designated as such in writing by DVSI or is disclosed
orally and within thirty (30) days thereafter is reduced to tangible form
pursuant to this License.
1.5 DVSI represents that it owns certain “Proprietary Rights” in
the Technology and the AMBEVoice Compression Software,
including patent rights in the Technology, and patent rights, copyrights,
and trade secrets in the AMBEVoice Compression Software.
2.0 License Granted
2.1 Subject to the conditions herein and upon initial use of the
AMBE™ Software within the VC-20™ - Vocoder Board, DVSI hereby
grants to END USER a non-exclusive, limited license to use the
AMBE®Voice Compression Software in machine readable form solely
on the VC-20™ - Vocoder Board. Title to the AMBE®Voice
Compression Software remains with DVSI. No license is granted for
use of the AMBE®Voice Compression Software on other than the VC-
20™ - Vocoder Board. No license, right or interest in any trademark,
trade name or service mark of DVSI is granted under this Agreement.
2.2 END USER shall not copy, extract, de-compile, reverse
engineer or disassemble the AMBE®Voice Compression Software
contained in the VC-20™ - Vocoder Board.
2.3 Transfer of License
(a) END USER may transfer the AMBE™ Software and all rights
under this agreement to a third party together with a copy of this
Agreement provided that END USER provides DVSI with 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 2.2, this Agreement, the
AMBE™ Software and any other information provided by DVSI to
END USER and any licenses and rights granted hereunder, may not be
sold, leased, assigned, sublicensed or otherwise transferred, in whole or
in part, by END USER.
2.4 END USER shall not de-compile, reverse engineer or
disassemble the AMBE™ Software.
3.0 Term and Termination
3.1 This Agreement is effective upon initial use of the AMBE™
Software on the Voice Codec and shall remain in effect until
terminated in accordance with this agreement.
3.2 This Agreement shall terminate automatically without notice
from DVSI if END USER fails to comply with any of the material
terms and conditions herein. END USER may terminate this
Agreement at any time upon written notice to DVSI certifying that
END USER has complied with the provisions of Section 3.3.
3.3 Upon termination of this Agreement for any reason, END
USER shall: (i) have no further rights to the AMBE™ Software; (ii)
discontinue all use of the AMBE™ Software; and (iii) destroy or, at
DVSI's option, return all copies of the AMBE™ Software.
4.0 Payments
4.1 In consideration of the hardware, software, and associated
materials provided as part of the VC-20™ - Vocoder Board, and in
consideration of the license and rights in the AMBE™ Software
granted by DVSI, and in consideration of DVSI's performance of its
obligations hereunder, END USER agrees to pay to DVSI the fee
specified in DVSI's invoice.
4.2 In consideration of the materials provided as part of VC-20™ -
Vocoder Board, and in consideration of the license and rights in the
AMBEVoice Compression Software granted by DVSI, and in
consideration of DVSI's performance of its obligations hereunder, END
USER agrees to pay to DVSI the fee specified in DVSI's invoice.
5.0 Proprietary Notices
5.1 END USER shall not remove any copyright or proprietary
notice on the on the AMBEVoice Compression Software or VC-20™
- Vocoder Board.
6.0 Proprietary Information
6.1 The parties agree that the AMBEVoice Compression
Software shall be considered Proprietary Information.
6.2 Except as otherwise provided in this Agreement, END USER
shall not use, disclose, make, or have made any copies of the
Proprietary Information, in whole or in part, without the prior written
consent of DVSI.
6.3 END USER shall make reasonable efforts to notify and inform
its employees having access to the Proprietary Information of END
USER's limitations, duties and obligations regarding nondisclosure and
VC-20- Serial Speech Data Interface

License and Warranty
The Speech Compression Specialists
DIGITAL VOICE SYSTEMS, INC.
copying of the AMBE™ Software. Proprietary Information shall be
used only by employees of END USER and only at the Designated
Site, except as provided under this agreement.
6.4 END USER shall have no obligations for disclosure or use of
Proprietary Information which: (i) is already known to END USER, at
time of disclosure by DVSI; (ii) is or becomes publicly known through
publication, inspection of product or otherwise through no wrongful act
of END USER; (iii) is received from a third party without restriction
and without breach of this Agreement; (iv) is independently developed
by END USER; (v) is disclosed to a third party by or on behalf of
DVSI without restriction; or (vi) is approved for release or use by
written authorization of DVSI.
6.5 Notwithstanding any termination pursuant to Section 3.0, the
obligations set forth in this Section 6.0 shall survive termination of this
Agreement.
7.0 Limited Warranty
7.1 DVSI warrants the VC-20™ - Vocoder Board and the
AMBE™ Software to be free from defects in materials and
workmanship under normal use for a period of ninety (90) days from
the date of delivery. DVSI further warrants that the VC-20™ -
Vocoder Board and the AMBE™ Software operate in accordance with
the written specifications delivered to END USER with the Voice
Codec.
7.2 Except as stated in Section 7.1, the VC-20™ - Vocoder Board
and AMBE™ Software are provided "as is" without warranty of any
kind. DVSI does not warrant, guarantee or make any representations
regarding the use, or the results of the use, of the Voice Codec or
AMBE™ Software with respect to its correctness, accuracy, reliability,
currentness or otherwise. The entire risk as to the results and
performance of the VC-20™ - Vocoder Board or AMBE™ Software is
assumed by the END USER. After expiration of the warranty period,
END USER, and not DVSI or its employees, assumes the entire cost of
any servicing, repair or correction of the Voice Codec or the AMBE™
Software.
7.3 DVSI warrants that it has the right to enter into this Agreement
and to grant a license to use the AMBE™ Software to END USER.
7.4 Except as specifically set forth in this Section 7.0, DVSI
makes no express or implied warranties including, without limitation,
the warranties of merchantability or fitness for a particular purpose or
arising from a course of dealing, usage or trade practice, with respect to
the Voice Codec or AMBE™ Software. Some states do not allow the
exclusion of implied warranties, so the above exclusion may not apply
to END USER. No oral or written information or advice given by
DVSI or its employees shall create a warranty or in any way increase
the scope of this warranty, and END USER may not rely on any such
information or advice. The limited warranties under this section 7.0
give END USER specific legal rights, 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 of business profits,
business interruption, and loss of business information), even if DVSI
or any DVSI representative has been advised of the possibility of such
damages.
8.2 Because some states do not allow the exclusion or limitation of
liability for consequential or incidental damages, the above limitations
may not apply to END USER.
8.3 DVSI's maximum liability for damages arising under this
Agreement shall be limited to 20% (twenty percent) of the fees paid by
END USER for the particular Voice Codec or VC-20™ - Vocoder
Board which caused the damages or that is the subject matter of, or is
directly related to, the cause of action.
9.0 Taxes
9.1 All payments required under Section 4.0 or otherwise under
this Agreement are exclusive of taxes and END USER agrees to bear
and be responsible for the payment of all such taxes (except for taxes
based upon DVSI's income) including, but not limited to, all sales, use,
rental receipt, personal property or other taxes which may be levied or
assessed in connection with this Agreement.
10.0 Export
10.1 United States export laws and regulations prohibit the
exportation of certain products or technical data received from DVSI
under this Agreement to certain countries except under a special
validated license. As of May 20, 1996 the restricted countries are:
Libya, Cuba, North Korea, Iraq, Serbia, Montenegro, and Iran. The
END USER hereby gives its assurance to DVSI that it will not
knowingly, unless prior authorization is obtained from the appropriate
U.S. export authority, export or re-export, directly or indirectly to any
of the restricted countries any products or technical data received from
DVSI under this Agreement in violation of said United States Export
Laws and Regulations. DVSI neither represents that a license is not
required nor that, if required, it will be issued by the U.S. Department
of Commerce. Licensee shall assume complete and sole responsibility
for obtaining any licenses required for export purposes.
11.0 Governing Law
11.1 This Agreement is made under and shall be governed by and
construed in accordance with the laws of the Commonwealth of
Massachusetts, except that body of law governing conflicts of law. If
any provision of this Agreement shall be held unenforceable by a court
of competent jurisdiction, that provision shall be enforced to the
maximum extent permissible, and the remaining provisions of this
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., One Van de Graaff
Drive, Burlington, MA., 01803, U.S.A.
VC-20- Vocoder Board User’s Manual

The Speech Compression Specialists
DIGITAL VOICE SYSTEMS, INC.
1. Introduction
The Digital Voice Systems, Inc. (DVSI) VC-20™ - - voice codec is a full-duplex real-time voice
processing board. The VC-20™ - - contains proprietary software which implements the
Advanced Multi-Band Excitation™ (AMBE™) voice coding algorithm. DVSI grants a license
to its customers to use this software according to the terms established in the attached AMBE™
Software END USER License Agreement. Use of the VC-20™ - -, or any portion thereof,
signifies acceptance of these licensing terms.
The VC-20™ - - operates by digitizing an analog speech signal using an on-board A-to-D
converter. This digitized speech is then processed by the encoder and converted into a data bit
stream. This bit stream is output to a modem or similar device. Simultaneously, the VC-20™ - -
receives a 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. 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-bit linear digital interface can be used.
2. Operation
Connections are made to the VC-20™ Serial Speech Data Interface using signals on ROW B and
ROW C of the attached DIN 41612 connector which is described in Section 4. When using the
Serial speech data interface the onboard codec MUST be disabled by installing a JUMPER
in Position 13 of JP1.
VC-20--Connector Signals
Name Direction Description
SCLK Input Serial Port Shift Clock
DX Output Serial Speech Data Output (16–bit linear)
DR Input Serial Speech Data Input (16–bit linear)
FSX Input Data Output Framing Signal
FSR Input Data Input Framing Signal
SP_RDY Output Serial Port Ready Signal
VC-20- Serial Speech Data Interface page 5

3. VC-20™ Connector Signals for Serial Speech Data Interface
SCLK
The Serial port shift clock clocks in both the received speech data and the transmitted speech
data. The frequency of this signal must be within the range 128kHz. – 5.16MHz.. Data is
clocked out on the rising edge of SCLK and clocked in on the falling edge (see Section 6.
Timing Diagrams).
DX
The speech data from the VC-20™ is clocked serially out on DX. These 16-bit linear words are
clocked out MSB first. The range of these twos complement coded words is –32768 to 32767.
(see Section 6. Timing Diagrams).
DR
The Speech data to the VC-20™ is clocked in serially on DR. These 16-bit linear words are
clocked in MSB first. The range of these twos complement coded words is –32768 to 32767.
(see Section 6. Timing Diagrams). It is recommended that the speech input 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 drivers on the same line.
SP_RDY
This active High Signal indicates that the serial port is ready to deliver and receive speech data.
SP_RDY is low upon reset, once it goes high it stays high until another reset condition occurs.
When SP_RDY is low FSX must be tri-stated to avoid a double driving condition. To avoid a
reboot, the 8kHz. framing signals must be valid once SP_RDY becomes active (see figure
below). The speech input data is ignored for a period of 10-50ms. after activation of SP_RDY
while initialization of the channel occurs. (see Section 5. Example Configuration)
SP_RDY
FSX
FSR
(Don’t Care)
(Tri-stated)

The Speech Compression Specialists
DIGITAL VOICE SYSTEMS, INC.
4. Connection Specifications DIN 41612 Connector (male)
ROW C ROW B ROW A
Pin
No. Function Name Name Function Function 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

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

The Speech Compression Specialists
DIGITAL VOICE SYSTEMS, INC.
6. Timing Diagrams (cont’d)
Continuous Mode (Special Case when SCLK = 128 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: [phone]
Fax: [phone]
email: [email protected]
web: www.dvsinc.com
VC-20- Serial Speech Data Interface page 9