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AMBE-3000F™ Vocoder Chip Users Manual
Version 3.4, April, 2014
(Subject to Change) Page 1
DVSI CONFIDENTIAL PROPRIETARY
Product Introduction
Digital Voice Systems, Inc.
The Speech Compression Specialists
1 Product Introduction
Digital Voice Systems Inc.’s AMBE-3000™ Vocoder Chip is an extremely flexible, high-performance speech compression
coder. DVSI has implemented its most advanced AMBE+2™ vocoder technology into a single DSP chip solution to achieve
unmatched voice quality, with robustness to background noise and channel bit errors. DVSI’s AMBE+2™ vocoder technology
outperforms G.729 and G.726 while adding additional features and benefits from DVSI’s previous industry-leading AMBE+™
Vocoder. The superior performance characteristics of the new AMBE+2™ Vocoder make it ideally suited for mobile radio,
secure voice, satellite communications, computer telephony, and other digital voice and storage applications where bandwidth
is at a premium and low data rate, and high-quality are both imperative.
The field-proven success of this technology has resulted in it being recognized as the standard for voice quality in
communications systems around the globe. DVSI’s AMBE+2™ technology is the preferred choice for many mobile radio
standards.
The AMBE-3000™ Vocoder Chip offers the affordability and mobility required by virtually all full or half-duplex mobile
communication devices. Two versions of the AMBE-3000™ Vocoder Chip are available. The AMBE-3000R™ Vocoder
Chip ROM version offers lower power requirements at a lower cost. Where as the AMBE-3000F™ Vocoder Chip Flash
version offers a few extra features that maybe useful in certain applications. This manual covers the features and capabilities of
the AMBE-3000F™ Vocoder Chip Flash version.
1.1 Advances in Vocoder Design
The AMBE-3000F™ Vocoder Chip voice coder maintains natural voice quality and speech intelligibility at rates as low as 2.0
kbits/sec. The AMBE-3000F™ Vocoder Chip provides a high degree of flexibility in selecting the speech and FEC (Forward
Error Correction) data rates. The user can separately select these parameters in 50 bps increments for total rates from 2.0 kbps
to 9.6 kbps. Plus, the AMBE-3000F™ Vocoder Chip offers similar features and backwards compatibility to DVSI’s AMBE-
2000™ and AMBE-1000™ Vocoder Chips allowing it to be incorporated into a system that can be interoperable with these
DVSI products.
1.2 AMBE-3000™ Vocoder Chip Features
The AMBE-3000™ Vocoder Chip includes a number of advanced features that are combined with low power consumption to
offer the affordability, mobility and power efficiency required by virtually all mobile communication devices.
DVSI’s full duplex AMBE+2™ Voice coder
Superior voice quality, low data rate speech coding
Supports variable data rates of 2.0 kbps to 9.6 kbps in 50 bps increments
Minimal algorithmic processing delay
Codec interfaces available (SPI or McBSP)
Packet interfaces available (UART, McBSP, PPT)
Configuration via hardware configuration pins and/or configuration packets
Supports a-law and µ-law companding
Robust to Bit Errors & Background Noise
Variable FEC Rates - 50 bps to 7.2 kbps
User Selectable Forward Error Correction rates
Viterbi Decoder (rate 1/4 or more)
- AMBE-3000F™ Vocoder Chip 1
- DVSI Confidential Proprietary 1
- (Subject to Change) Page v 5
- (Subject to Change) Page x 10
- 1 Product Introduction 11
- 1.3 Typical Applications 12
- 2 Hardware Information 13
- 2.2 Package Details 14
- (Subject to Change) Page 5 15
- 2.3 Pin Assignment Layouts 16
- A B C D E F G H J K L M N P 17
- (Subject to Change) Page 8 18
- (Subject to Change) Page 9 19
- 2.5 Pin Out Table 20
- PARITY_ENABLE 79 22
- Input Enable parity bit 22
- Table 1 Pinout List 26
- 2.7.1 External Clock Source 29
- 2.7.2 Crystal Oscillator 29
- Table 7 Voltage Supply Pins 32
- 3.6 Reset Behavior 33
- Figure 11 TX_RDY after Reset 34
- Figure 12 Output Levels 34
- 3.8 Power-Down Sequencing: 35
- 3.9 Low Power Modes 35
- 3.9.1 Run State 36
- 3.9.2 Idle State 36
- 3.9.3 Standby State 36
- 3.9.4 Halt State 36
- 3.9.5 Power Modes 37
- 4.2 Interface Selection 40
- 4.4 Vocoder State 41
- Figure 18 Typical Echo Path 43
- Table 11 Companding Control 44
- 5 I/O Management 45
- Table 13 ECMODE_IN Flags 46
- Table 14 ECMODE_OUT FLAGS 46
- Table 15 DCMODE_IN Flags 47
- Table 16 DCMODE_OUT Flags 47
- 5.2 Codec mode 49
- “0 to Transition”“1” 51
- “Packet_ _Zone”Uncertainty 51
- “aperiodic packets” 52
- 5.3 Packet Mode 53
- Figure 29 Packet Mode 55
- 5.5 SPI Interface 56
- 5.6 UART Interface 57
- 5.7 McBSP Interface 58
- 5.8 Parallel Interface 61
- Table 26 PPT Timing 62
- Figure 36 Vocoder Front End 64
- Diagram 66
- 6.1 Overview 68
- 6.2 Codec Mode Operation 68
- 6.3 Packet Mode Operation 68
- 6.4 Packet Interfaces 69
- 6.5 Packet Format 69
- 6.5.3 TYPE (1 byte) 70
- 6.5.4 Packet Fields 70
- Table 59 PKT_CODECSTOP Field 78
- Table 61 PKT_CHANFMT Field 79
- samples dcmode 80
- Table 64 PKT_SPCHFMT Field 80
- 0x54 0x46 0x00 81
- Table 71 PKT_READY Field 82
- Table 72 PKT_HALT Field 82
- Table 73 PKT_RESET Field 82
- 6.7.1 Speech Packet Fields 89
- Table 100 CMODE Field Format 90
- Table 103 TONE Field Format 90
- 6.11 Example Packets 94
- 7 Appendices 98
- Table 115 Rate Index Numbers 100
- 8 Support 103
- Digital Voice Systems, Inc 104
- 10 IC Chip Software Errata 107
- Release 007 09/10/2009 108
- Release 014 08/31/2012 108
- 11 History of Revisions 109
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