CT8022 Datasheet, PDF(154/194 Page) List of Unclassifed Manufacturers – VOIP/VON G.723.1, G279AB TRUESPEECH CO-PROCESSOR

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CT8022 Datasheet, PDF (154/194 Pages) List of Unclassifed Manufacturers – VOIP/VON G.723.1, G279AB TRUESPEECH CO-PROCESSOR

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TrueSpeechÂ® 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 CODEC Routing Configuration

0 Normal operation

This setting must be selected for standalone speakerphone operation

1 CODEC 0 input echoed to CODEC 0 output and

CODEC 1 input echoed to CODEC 1 output

2 CODEC 0 input echoed to CODEC 1 output and

CODEC 1 input echoed to CODEC 0 output

3 CODEC 0 input echoed to CODEC 0 and CODEC 1 output

4 CODEC 1 input echoed to CODEC 0 and CODEC 1 output

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 â1â 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

00XXH

XX=00 Post Filter On (normal, default operating state)

XX=01 Reserved

XX=10H Post Filter Off for G.723.1

Set High Pass Filter

C1:

S1:

C2:

C3:

5417H

00XXH

XX=00

XX=01

154

High Pass Filter On (normal, default operating state)

High Pass Filter Off ( G.723.1)

DSP GROUP, INC., 3120 SCOTT BOULEVARD

CT8022A11AQC FW Revision 0118

SANTA CLARA, CA 95054 PH: 408 986 â 4300 FAX: 408 986 â 4490

All specifications are subject to change without prior notice.

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