TrueSpeech® Co-Processor
PRELIMINARY/CONFIDENTIAL
Version: 1.18
9.23.6
CODEC (Audio) Monitoring
CODEC Monitoring provides a mechanism that allows the input signal at one CODEC to be monitored (echoed) to
the output of either or both CODECs. This mechanism operates independently of the primary CT8022 operational
modes (e.g. record). This allows the Host to implement call-screening type functions where the user can monitor a
recording being made via the input from CODEC 0 via the output of CODEC 1.
Command: CE1XH
Status:
CE1XH
where X selects the action from the following table:
X
0
CODEC Routing Configuration
Normal operation
This setting must be selected for standalone speakerphone operation
CODEC 0 input echoed to CODEC 0 output and
CODEC 1 input echoed to CODEC 1 output
CODEC 0 input echoed to CODEC 1 output and
CODEC 1 input echoed to CODEC 0 output
CODEC 0 input echoed to CODEC 0 and CODEC 1 output
CODEC 1 input echoed to CODEC 0 and CODEC 1 output
1
2
3
4
The values selected for Input CODEC and Output CODEC in the CODEC Configuration command override the
CODEC routing described here. For example, setting CODEC Input to ‘1’ will reverse the CODEC input entries in
the above table.
For any operations involving playback or tone generation, X should be set to zero.
9.23.7
Speech Algorithm Testing
The CT8022 supports the following commands to support compliance verification of certain speech algorithms
based on ITU standards. Note that these are special test mode commands only. Refer to the appropriate ITU Speech
Coder Standard documentation for further information:
Set Post Filter Control
C1:
S1:
C2:
C3:
5416H
5416H
00XXH
00XXH
XX=00
XX=01
Post Filter On (normal, default operating state)
Reserved
XX=10H Post Filter Off for G.723.1
Set High Pass Filter
C1:
S1:
C2:
C3:
5417H
5417H
00XXH
00XXH
XX=00
XX=01
High Pass Filter On (normal, default operating state)
High Pass Filter Off ( G.723.1)
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DSP GROUP, INC., 3120 SCOTT BOULEVARD CT8022A11AQC FW Revision 0118
SANTA CLARA, CA 95054 PH: 408 986 – 4300 FAX: 408 986 – 4490
All specifications are subject to change without prior notice.
ETC [ ETC ]
