Digital Voice Systems AMBE-3000 Specifications download pdf (Page 80)

AMBE-3000F™ Vocoder Chip Users Manual

Version 3.4, April, 2014

Dat

a and Configuration Packets

PKT_SPCHFMT Field - Format

Field Identifier Control Field Data

1 Byte 2 Bytes

15|14 13|12 11|10 9|8 7|6 5|4 3|2 1|0

samples dcmode

0x16 Reserved (bits set to 0) See Table

Table 64 PKT_SPCHFMT Field

NOTE: All Reserved data bits in the PKT_SPCHFMT Field (bits 4 through bit 15) must be set to 0 in order to

avoid unexpected results.

Options for PKT_SPCHFMT Field

Description Value

dcmode bit 1 bit 0

Output Speech packets never contain dcmode field 0 0

Output Speech packets always contain dcmode field 0 1

Output Speech packets only contain dcmode field when changed 1 0

Reserved 1 1

samples bit 3 bit 2

Output Speech packets NEVER include the number of samples contained in the

current speech frame.

0 0

Output Speech packets ALWAYS include the number of samples contained in the

current speech frame.

0 1

Output Speech packets include the number of samples contained in the current

speech frame ONLY WHEN IT IS DIFFERENT FROM THE LAST FRAME.

1 0

Output Speech packets include the number of samples contained in the current

speech frame ONLY WHEN THE NUMBER OF SAMPLES DOES NOT EQUAL

160.

1 1

Table 65 PKT_SPCHFMT Data Settings

PKT_SPCHFMT Response field (1 byte) this field indicates the output Speech packet format has been changed.

PKT_SPCHFMT Response Field - Format

Field Identifier Response Field Data

1 Byte 1 Byte

0x16

0x00

(anything different indicates error)

Table 66 PKT_SPCHFMT Response Field

PKT_PRODID field (1 byte total) this field will cause the AMBE-3000F™ Vocoder Chip to respond with a string that

contains the product identification.

(Subject to Change) Page 70

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