msm7718-01 Oki Semiconductor, msm7718-01 Datasheet - Page 23

• Manufacturer Part Number: msm7718-01
• Description: Echo Canceler With Adpcm Codec
• Manufacturer: Oki Semiconductor

¡ Semiconductor
Figure 7-2 Line Echo Canceler Expansion
MSM7718
MSM7718
PCM CODEC
PCM CODEC
Figure 7-1 Normal Speech Mode
Echo Canceler
Echo Canceler
23 ms Line
54 ms Line
Mode
Tone Generator
Tone Generator
Tone Detector
Tone Detector
ADPCM DECODER
ADPCM DECODER
ADPCM CODER
ADPCM CODER
Note :
Note :
• When the MSM7718 is used in line echo
• In line echo canceler expansion mode, the
• The PCM CODEC does not operate in this
• When the MSM7718 is used in normal speech
• In normal speech mode, the tone detector can
canceler expansion mode, set the TSTI4 pin to
digital “1”.
tone detector can detect not only call progress
tone and DTMF tone by PMLNI input but
also 2100 Hz tone by PCMLNI and PCMACI
input (bidirectional).
mode. A capacitor is required between SGT
and ground and between SGR and ground
(see Application Circuit).
mode, set the TSTI4 pin to “0”.
detect call progress tone and DTMF tone by
PMLNI input.
MSM7718-01
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