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AMBE-3000F™ Vocoder Chip Users Manual

Version 3.4, April, 2014

Dat

a and Configuration Packets

6.5.3 TYPE (1 byte)

Referring to Table 28 General Packet Format WITHOUT Parity Field, the PACKET TYPE occupies the fourth byte of every

packet.

There

are 3 different packet types for the AMBE-3000F™ vocoder chip.

Packet Types

Packet Name Description

Type Value

(Hex)

Control /

Configuration

Packet

Used to setup chip modes, rates, configure hardware, initialize

encoder/decoder, enable low-power mode, specify output packet formats,

etc. When a control packet is received the chip returns a control packet

with response fields that contain response data for some control packets

or indication of errors in the control packet.

0x00

Speech Packet

These packets are used to input speech data to encoder and to output

speech data from the decoder. In addition to speech data, the packet can

provide flags to control the encoder operation on a frame-by-frame basis.

The speech packet also can have a field that forces the encoder to

produce a tone frame.

0x02

Channel Packet

These packets are used to input channel data to the decoder and to output

channel data from the encoder. In addition to channel data the packet can

provide flags that control the decoder operation on a frame-by-frame

basis. A channel packet can also contain a field that forces the decoder to

produce a tone frame.

0x01

Table 30 Packet Types

6.5.4 Packet Fields

Referring to Table 28 General Packet Format WITHOUT Parity Field, the remainder of a packet after the START_BYTE,

LENGTH, and TYPE is made up of packet fields. The packet fields contain the useful packet information. Various different

packet fields each with their own format are defined in the next sections, however, the general format of a field is shown in

Table 31 General Field Format.

A fi

eld consists of a field identifier followed by field data. The length of field data is dependent upon the field identifier.

Many fields have fixed lengths. Some fields, such as those that contain speech samples or channel data are variable in length;

and in such cases the length of the field data is embedded inside field data.

Field - Packet Format

Field Identifier Field Data

1 byte L

-1 bytes

Table 31 General Field Format

(Subject to Change) Page 60

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