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Echo Canceler(echo annihilator) product
 
Model
May eliminate the echo latency time
Echo weaken
Noise attenuation
Master clock frequency
Connection
Digital interface encoding method
Digital interface synchronous mode
Pack

1) the single-channel echo cancellation pattern (only then acoustics echo annihilator enables): Acoustics echo annihilator's biggest processing time delay Tacoud=64ms 2) the two-circuit echo cancellation pattern (acoustics resonator and line echo annihilator enables): Acoustics echo annihilator biggest processing time delay Tacoud=64ms; Line echo annihilator biggest processing time delay Tlined=20ms.
35 dB (type) for white noise
Eliminates white noise 35dB to eliminate white noise 13dB

19.2 MHz

1) analog input 2) analog output 3) digital interface

1)u-law PCM
2)16-bit linear (2's complement)

1)Normal-sync

2)Short-frame-sync
1) normal synchronization 2) short frame synchronized 64-pin plastic TQFP
MSM7731

1) the single-channel echo cancellation pattern (only then acoustics echo annihilator enables): Acoustics echo annihilator's biggest processing time delay Tacoud=59ms 2) the two-circuit echo cancellation pattern (acoustics resonator and line echo annihilator enables): Line echo annihilator biggest processing time delay Tlined=27ms. acoustics echo annihilator biggest processing time delay Tacoud=59ms-Tlined
35 dB (type) for white noise

Eliminates white noise 35dB Eliminates white noise 13dB Eliminates tone 40 dB
12.288MHz

1) analog input 2) analog output 3) digital interface

1)u-law PCM

2)16-bit linear (2's complement)

1)Normal-sync

2)Short-frame-sync
1) normal synchronization 2) short frame synchronized 64-pin plastic TQFP
ML7037－002

1) the single-channel echo cancellation pattern (only then acoustics echo annihilator enables): Acoustics echo annihilator's biggest processing time delay Tacoud=59ms 2) the two-circuit echo cancellation pattern (acoustics resonator and line echo annihilator enables): Line echo annihilator biggest processing time delay Tlined=27ms. acoustics echo annihilator biggest processing time delay Tacoud=59ms-Tlined
35 dB (type) for white noise
Eliminates white noise 35dB to eliminate white noise 13dB
12.288MHz

1) analog input 2) analog output

1)u-law PCM

2)16-bit linear (2's complement)

1)Normal-sync

2)Short-frame-sync
1) normal synchronization 2) short frame synchronized 64-pin plastic TQFP
 
   (note:)ML7037-003 is a section of special-purpose echo cancellation chip, most is suitable in Che Zaimian the body system and the teleconference system as well as the full-duplex to speaks the system and so on, this chip built-in line echo annihilator, acoustics echo annihilator and noisekiller.
    This chip planned the connection place distinction built-in linear codec encoder-decoder's voice signal connection in acoustics side analogue interface and the line side form. Has provided for the data transmission and the receive gain control and the static sound control function as well as for recording and the news output u-lawPCM/16-bit linear digital interface, but also has for the digital communication shifting clock and the synchronized clock, thus this chip is most suitable to use in exempting raises the system.
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