TrueSpeech® Co-Processor
PRELIMINARY/CONFIDENTIAL
Version: 1.18
Table 12-6: Electrical Echo Canceller Performance
PARAMETER
NOTE
Training pulse duration
Echo duration
Canceller length
Training pulse peak amplitude
Training pulse average peak
amplitude
16ms
1
1
1,2
3
23.25ms
7.38ms
350 mV
250 mV
3
Electrical echo cancellation
34 dB
4
Notes:
1. Assumes operation of CODEC at 8.0 KHz sample rate.
2. The electrical echo canceller will model the impulse response of the attached line circuit for an impulse
response up to this duration.
3. Measured at the CODEC output pin using a TP3054 Texas Instruments µ-law CODEC.
4. The electrical echo canceller will achieve 34 dB cancellation for white noise with the line CODEC output
short circuit connected to the line CODEC input.
174
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 ]
