Specifications

AMBE-3000™ Vocoder Chip Users Manual
Version 2.8, August, 2011
Dat
a and Configuration Packets
samples bit 5 bit 4
Output Channel packets NEVER include the number of samples used
in the current frame.
0 0
Output Channel packets ALWAYS include the number of samples
used in the current frame.
0 1
Output Channel packets include the number of samples used in the
current frame ONLY WHEN IT IS DIFFERENT FROM THE LAST
FRAME.
1 0
Output Channel packets include the number of samples used in the
current frame ONLY WHEN THE NUMBER OF SAMPLES DOES
NOT EQUAL 160.
1 1
Table 62 PKT_CHANFMT Data Settings
PKT_CHANFMT Response field (1 byte) this field indicates the output channel packet format has been changed.
PKT_CHANFMT Response Field - Format
Field Identifier Response Field Data
1 Byte 1 Byte
0x15 0x0
Table 63 PKT_CHANFMT Response Field
PKT_SPCHFMT field (3 bytes total) this field will set the format of the Speech packets output from the AMBE-3000™
Vocoder Chip
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
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 0 0
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.
(Subject to Change) Page 62
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