Digital Voice Systems VC-20-MR2 User Manual
Background Noise Condition
VSELP @ 8.0 kbps
Mean Opinion
Score
(
or DMOS)
FIRSTPLAC
E
DIGITAL VOICE SYSTEMS, INC.
The Speech Compression Specialists
…101111010100110101
…10100110101110101001
Voted To be
The BEST…
Best
Vocoder
MOS
4.2
4
3.8
3.6
3.4
3.2
3
2.8
2.6
2.4
2.2
2
Clean (MOS) Traffic
(DMOS)
Truck Noise
@ 15dB
AMBE Voice Coder @ 3.6 kbs
Avg. of Others @ 3.6 bps
Truck Noise
@ 6dB
Babble
(DMOS)
DIGITAL VOICE SYSTEMS, INC.
The Speech Compression Specialists
VC-20 AMBE Vocoder Board
USERS MANUAL
Version 2.0
VC-20 AMBE™ Vocoder Board User’s Manual
VC-20 AMBE™ Vocoder Board User’s Manual
D
IGITAL
V
OICE
S
YSTEMS
, INC.
The Speech Compression Specialists
VC-20 AMBE™ Vocoder Board
User’s Manual
Copyright , 1998
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 AMBE Vocoder Board is registered trademarks 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 AMBE™ Vocoder Board User’s Manual
The Speech Compression Specialists
D
IGITAL
V
OICE
S
YSTEMS
, INC.
VC-20 AMBE™ 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 AMBE™ Vocoder Codec , 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 AMBE-1000™ Vocoder Chip. 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
Voice Codec. 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 AMBE™ 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.
License and Warranty
(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 Voice Codec, 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 the Voice
Codec, 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
AMBE™ 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
VC-20 AMBE™ Vocoder Board User’s Manual
License and Warranty
USER's limitations, duties and obligations regarding nondisclosure
and 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 Voice Codec 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 Voice Codec 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 Voice Codec 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 Voice Codec 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 AMBE™ 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 AMBE™
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., 234 Littleton Road,
Westford, MA., 01886, U.S.A.
VC-20 AMBE™ Vocoder Board User’s Manual
Contents
D
IGITAL
V
OICE
S
YSTEMS
, INC.
The Speech Compression Specialists
TABLE OF CONTENTS
Section 11 PRODUCT INTRODUCTION ..................................................................1
1.1 GENERAL INFORMATION..........................................................................1
1.2 VC-20 AMBE™ VOCODER BOARD FEATURES: .......................................2
1.3 AMBE-1000™ VOCODER CHIP FEATURES: ............................................2
1.4 AMBE™ VOCODER APPLICATIONS:........................................................2
Section 22 VC-20 AMBE™ VOCODER BOARD OVERVIEW...................................5
2.1 ADVANCED MULTI-BAND EXCITATION (AMBE
2.2 VC-20 AMBE VOCODER BOARD BASIC OPERATION ............................. 5
2.3 SPECIAL HANDLING AND STORAGE PRECAUTIONS ....................................7
Section 33 BOARD SET-UP & CONFIGURATION ....................................................9
3.1 CONNECTION SPECIFICATIONS................................................................9
3.2 DIN41612 96-PIN CONNECTOR SPECIFICATIONS...................................10
3.3 VC-20-MR2 CONNECTOR SIGNALS ......................................................11
3.4 VC-20-MR2 CONNECTOR SIGNALS ......................................................11
3.5 VC-20-MR2 ON-BOARD JUMPERS CONNECTOR SIGNALS........................15
3.6 VC-20-MR2 DTMF TONE DATA...........................................................15
VOCODER)........................5
Section 44 DVSI SERVICES AND SUPPORT SOLUTIONS......................................17
4.1 TECHNICAL SUPPORT...........................................................................17
VC-20 AMBE™ Vocoder Board User’s Manual
i
D
IGITAL VOICE SYSTEMS, INC.
The Speech Compression Specialists
Section 1- Product Introduction
1 Product Introduction
1.1 General Information
The Digital Voice Systems, Inc. (DVSI) VC-20-MR2 voice codec is a full-duplex
real-time voice processing board. The VC-20-MR2 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-MR2, or any portion thereof, signifies acceptance of
these licensing terms.
The VC-20-MR2 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 4.8/2.4 kbps data bit stream. This bit stream is output to a modem
or similar device. Simultaneously, the VC-20-MR2 receives a 4.8/2.4 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. The encoder and
decoder are fully asynchronous.
The VC-20-MR2 (4800bps) has been designed to be robust to both acoustic
background noise and channel errors. It generally contains sufficient channel error
protection to produce high quality speech at bit error rates up to 1-2% and
intelligible speech at bit error rates up to 4-5%.
The VC-20-MR2 (2400bps) has been designed to be robust to acoustic background
noise and limited channel errors. The VC-20-MR2 (2400) will produce intelligible
speech at bit error rates up to 1-2%.
The VC-20-MR2 includes a number of advanced features such as an
automatic Voice/Silence detection (VAD), adaptive comfort noise
generation, DTMF detection and signaling, soft-decision decoding, frame
stealing support and echo cancellation. Operation of these features is
described in the following sections. The VC-20-MR2 is also capable of
supporting optional features such as external codecs and downloading
VC-20 AMBE™ Vocoder Board User’s Manual
page 1
Section 1 – Product Introduction
D
custom software.
It provides a real-time, full-duplex implementation of the standard-setting AMBE
voice compression technology. This technology patented by DVSI has been proven
to outperform CELP and other competitive technologies. Numerous evaluations
have shown its ability to provide performance equal to today’s digital cellular
systems at under half the data rate. The AMBE voice compression algorithm is
used in applications throughout the world, including the next generation of digital
mobile communication systems.
1.2 VC-20 AMBE™ Vocoder Board Features:
IGITAL VOICE SYSTEMS, INC.
The Speech Compression Specialists
• High Quality Low Data Rate Speech Coding
• Extremely Flexible Bit Rate Selection
1.3 AMBE-1000™ Vocoder Chip Features:
• High Quality Low Data Rate Speech Coding
• DVSI Full Duplex AMBE Voice Coder
• Supports Data Rates of 2.4 kbps and 4.8 kbps
• Self-Test Loop-Back Mode
• Echo Cancellation
• Dual Tone / DTMF
• Power-Down Mode
1.4 AMBE™ Vocoder Applications:
page 2
VC-20 AMBE™ Vocoder Board User’s Manual
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