CT8022 Datasheet, PDF (179/194 Pages) List of Unclassifed Manufacturers – VOIP/VON G.723.1, G279AB TRUESPEECH CO-PROCESSOR

Version: 1.18
PRELIMINARY/CONFIDENTIAL
Appendices
A Speakerphone Theory Of Operation
TrueSpeech® Co-Processor
Speaker
Volume
Spk. Codec1
Out
Mic.
In
Acoustic
Echo
Canceler
Mic.
VOX
-
Volume
Compens.
Receive
Attenuator
Line
Vol. Comp.
Line
VOX
CONTROL
Dial
Tone
Detec.
Train
pulse
Gen.
Transmit
Attenuator
Line
Out Vol.
-
Line
Echo
Canceler
Codec0 Line
In
Line
Out
Figure A-1: SpeakerPhone – Digital Part
Acoustic
Coupling
A4 Spk.
Out
A1
Mic.
In
Codec1
Digital
Speaker
Phone
Line
In
A3
Codec0
Line
Out
A2
Line
Interface
4to2 wire
coupling
2 wire
Tel.
Line
Figure A-2: SpeakerPhone – Acoustic and Analog Parts
CT8022A11AQC FW Revision 0118
DSP GROUP, INC., 3120 SCOTT BOULEVARD
179
SANTA CLARA, CA 95054 PH: 408 986 – 4300 FAX: 408 986 – 4490
All specifications are subject to change without prior notice.