MSM7731-02 OKI [OKI electronic componets], MSM7731-02 Datasheet - Page 25

• Manufacturer Part Number: MSM7731-02
• Description: Dual Echo Canceler & Noise Canceler with Dual Codec for Hands-Free
• Manufacturer: OKI [OKI electronic componets]

Echo Canceler Characteristics Data 1 (Line Echo, White Noise)
(Measuring Condition)
Echo attenuation = 40 dB
Echo Canceler Characteristics Data 2 (Line Echo, Voice)
(Measuring Condition)
Echo attenuation = 34 dB
Echo Canceler Characteristics Data 3 (Acoustic echo, Voice)
(Measuring Condition)
Echo attenuation = 34 dB
Measurement System Block Diagram (Acoustic Echo)
1 Semiconductor
RIN
SOUT
EC
ROUT
M7731
SIN
AVFRO
AGSX
AOUT
APWI
AIN
Rin signal
Rin input level
E.R.L
ATT, GC
Noise floor
Rin signal
Rin input level
E.R.L
ATT, GC
Noise floor
Rin signal
Rin input level
Speaker output level
Distance from microphone and speaker
GC
ATT, Noise Canceler
Noise floor
22 k
R9
3 V
22 k
R13
R14
22 k
0.734 k
RV4
10 k
RV1
100
1.2 k
10 µ
R7
R15
C9
: 5 kHz band white noise
: –20 dBm
: 0 dB
: OFF
: –60 dBm (P-message filter unused)
: voice
: about –20 dBm
: 0 dB
: OFF
: –60 dBm (P-message filter unused)
C10
1 µ
0.1 µ
+
C13
2.2 k
10 k
R16
R8
0.1 µ
C14
MIC
J1
AG
U13LM4861
1
2
3
4
470 k
: OFF
: voice
: about –20 dBm
: 80 dB (A) (at 1 m)
: 5 cm
: OFF
: –60 dBm (P-message filter unused)
R17
10 p
C15
8
7
6
5
AG
5 V
SP
J3
MIC
SP
FEDL7731-02-04
MSM7731-02
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