msm7731-01 Oki Semiconductor, msm7731-01 Datasheet - Page 26

• Manufacturer Part Number: msm7731-01
• Description: Multifunction Pcm Codec Voice Signal Processor
• Manufacturer: Oki Semiconductor

¡ Semiconductor
Echo Canceler Characteristics Data 1 (Line Echo, White Noise)
(Measuring conditions) Rin signal
Echo attenuation=40dB
Echo Canceler Characteristics Data 2 (Line Echo, Voice)
(Measuring conditions) Rin signal
Echo attenuation=34dB
Echo Canceler Characteristics Data 3 (Acoustic Echo, Voice)
(Measuring conditions) Rin signal
Echo attenuation=34dB
Measurement System Block Diagram (Acoustic Echo)
SOUT
RIN
EC
M7731
ROUT
SIN
Rin input level
Speaker output level
Distance from microphone and speaker : 5cm
GC
ATT, Noise Canceller
Noise floor
Rin input level : –20dBm
E.R.L
ATT, GC
Noise floor
Rin input level : about –20dBm
E.R.L
ATT, GC
Noise floor
AVFRO
AGSX
APWI
AOUT
AIN
R9
22k
R13
R14
22k
22k R15
3V R7
: 5 kHz band white noise
: 0dB
: OFF
: –60dBm (P-message filter unused)
: Voice
: 0dB
: OFF
: –60dBm (P-message filter unused)
RV4
RV1
1.2k
10k
100
C9
734
10µ
C10
C13
+
1µ
0.1µ C14
R16
R8
10k
0.1µ
2.2k
AG
J1
MIC
: Voice
: about –20dBm
: 80dBa (at 1m)
: OFF
: ON
: –60dBm (P-message filter unused)
1
2
3
4
U13
LM4861
C15
R17
470k
10p
8
7
6
5
AG
5V
J3
SP
MIC
SP
MSM7731-01
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