TrueSpeech® Co-Processor
PRELIMINARY/CONFIDENTIAL
Version: 1.18
9.21.4
Speakerphone Configuration Command
This command may be used in DSVD Speakerphone mode provided that Line Training = 00.
1110
010
0 0000
(8-4)
Line Training
(3-2)
Automatic Loop Adjustment
(15-12)
(11-9)
(1-0)
Status:
1110
010
0 0000
(8-4)
Line Training
(3-2)
Automatic Loop Adjustment
(1-0)
(15-12)
(11-9)
Automatic Loop Adjustment:
00:
Loop Attenuation is not automatically adjusted
01:
Increase loop attenuation by 12 dB on detection of abnormal conditions.
Maintain modified attenuation until a new command is received from Host.
Increase loop attenuation by 12 dB on detection of abnormal conditions.
Attempt to restore normal loop attenuation when possible. This is the
preferred (normal) setting.
10:
11:
Reserved
Line Training:
00:
01:
10:
11:
Do not modify line-side (electrical) echo canceller settings.
Send training pulse to line to set (electrical) echo canceller coefficients.
Reserved
Reserved
When the Acoustic Echo Canceller (AEC) is active in DSVD speakerphone mode, the Line Training field should
always be set to 00.
9.21.5
Generate Tone (In Speakerphone Mode)
This command is not available in DSVD Speakerphone mode.
1110
100
Master Gain
(8-5)
Tone Index
(4-0)
(15-12)
(11-9)
Status:
1110
100
Master Gain
(8-5)
Tone Index
(4-0)
(15-12)
(11-9)
See Generate Tone command (mode 6) for usage.
Each command/status interaction generates tone for 30ms.
Use Tone Index #0 to generate silence between dialed digits. During tone generation, the speech path between
CODEC0 and CODEC1 is disabled. To re-enable this path at the end of DTMF dialing, the Host should issue
command E000H (Get Speakerphone Status) to inform the CT8022 that dialing is complete.
144
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 ]
