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AMBE-3000F™ Vocoder Chip Users Manual
Version 3.4, April, 2014
(Subject to Change) Page 30
DVSI CONFIDENTIAL PROPRIETARY
Initial Design Considerations
Digital Voice Systems, Inc.
The Speech Compression Specialists
Digital Voice Systems, Inc.
The Speech Compression Specialists
4 Initial Design Considerations
Some of the initial design considerations the application engineer will face are the following:
Speech and FEC rates. (2000 – 9600 bps)
Mode of operation (codec mode or packet mode)
Choice of codec interface. (SPI, McBSP) - for codec mode only!
Choice of packet interface. (UART, McBSP, PPT)
Choice of A/D-D/A chip. - for codec mode only!
Implementing the AMBE-3000F™ Vocoder Chip into a communication system requires the selection of various components.
The AMBE-3000F™ Vocoder Chip offers multiple interfaces for flexibility in integration into a variety of design
configurations.
In its simplest model, the AMBE-3000F™ Vocoder Chip can be viewed as two separate components, the Encoder and the
Decoder. The Encoder receives an 8 kHz sampled stream of speech data (16-bit linear, 8-bit A-law, or 8-bit µ-law) and outputs
a stream of channel data at the desired rate. Simultaneously, the AMBE-3000F™ Vocoder Chip receives compressed voice
channel data. This data is decoded by the AMBE-3000F™ Vocoder Chip, then reconstructed into a digital speech signal and
sent to the D/A. The encoder and decoder functions are fully asynchronous.
The special functions of the AMBE-3000F™ Vocoder Chip, such as echo cancellation, voice activity /detection, power mode
control, data/FEC rate selection, etc. can be controlled either through hardware control pins and/or through the packet interface.
Figure 17 Basic Operation
4.1 Vocoder Speech and FEC Rate Selection
The voice coding rate as well as the FEC coding rate can be selected individually on the AMBE-3000F™ Vocoder Chip.
These rates are selected by using a configuration control packet, or through hardware configuration pins. The hardware
configuration pins provide the user with 62 pre-configured voice/FEC rates. If rates other than these are desired, then a
configuration control packet can be used to configure voice and FEC rates in 50 bps increments.
4.2 Interface Selection
Basic communication to/from the AMBE-3000F™ Vocoder Chip consists of input digitized speech data samples, output
digitized speech data samples, input compressed speech data and output compressed speech data. There are four physical
interfaces (SPI, McBSP, UART and Parallel) used to transfer the data to/from the AMBE-3000F™ Vocoder Chip.
- 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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