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