Digital Voice Systems AMBE-3000 Spezifikationen PDF herunterladen (Seite 96)

AMBE-3000F™ Vocoder Chip Users Manual

Version 3.4, April, 2014

Dat

a and Configuration Packets

49004A004B004C004D004

E004F0050005100520053

005400550056005700580

059005A005B005C005D00

5E005F006000610062006

300640065006600670068

0069006A006B006C006D0

06E006F00700071007200

730074007500760077007

80079007A007B007C007D

007E007F0080008100820

083008400850086008700

880089008A008B008C008

D008E008F009000910092

009300940095009600970

0980099009A009B009C00

9D009E009F

Table 112 Speech Packet Example 2

This is the similar to the prior example except that a CMODE field and a TONE field were added to the end of the packet. The

packet indicates that the speech samples will be passed to the encoder for channel 0. The length field changed to 0x0149

because the packet length increased by 6 bytes. For the new bytes at the end of the packet (0x02) is the CMODE field

identifier. The following two bytes (0x0000) specifies that the encoder cmode flags should be set to 0x0000. The next byte

(0x08) is a TONE field identifier. The next two bytes (0x03 and 0x00) specify tone index of 3 and tone amplitude of 0 dBm0.

6.11.3 Channel Packet Example 1

Following is an example channel packet (hexadecimal) for input to the AMBE-3000F™ Vocoder Chip:

Channel Packet

Header CHAND Field

StartByte

Length

Type

CHAND

Field Identifier

CHAND No. of

Bits

CHAND Data

61 000C 01 01 50 00112233445566778899

Table 113 Channel Packet Example 1

The first byte (0x61) is the packet header byte. The next two bytes (0x000C) specify that the length of the packet (excluding

the header, length, and type bytes) is 12 bytes. The next byte (0x01) specifies that the packet type is a channel packet. The next

byte (0x01) is the field identifier for a CHAND field. The next byte (0x50) specifies that 80 bits of channel data follow. The

bits are packed 8 bits per byte such that the 80 bits are contained in the 10 bytes that follow. The final 10 bytes contain the

channel data. The bits are output with the most significant (and most sensitive to bit-errors) bits in the first byte and the least

significant (and least sensitive to bit-errors) bits in the last byte. For bit-rates that are not an even multiple of 400 bps, the

MSBs of the last byte are used to hold the channel data, and the LSBs will be padded with zeros.

Note that in this example, the packet contains no VOCODERID field, and therefore channel 0 is assumed.

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