ml7074-003 Oki Semiconductor, ml7074-003 Datasheet - Page 25

• Manufacturer Part Number: ml7074-003
• Description: Dual Echo Canceler & Noise Canceler With Dual Codec For Hands-free Msm7731-02dual Echo Canceler & Noise Canceler With Dual Codec For Hands-free
• Manufacturer: Oki Semiconductor

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)
OKI Semiconductor
RIN
SOUT
EC
ROUT
M7731
SIN
Rin signal
Rin signal
Rin signal
AVFRO
Rin input level
E.R.L
ATT, GC
Noise floor
Rin input level
E.R.L
ATT, GC
Noise floor
Rin input level
Speaker output level
Distance from microphone and speaker
GC
ATT, Noise Canceler
Noise floor
AGSX
AOUT
APWI
AIN
22 k
R9
3 V
22 k
R13
R14
22 k
0.734 k
: –20 dBm
: 0 dB
: –60 dBm (P-message filter unused)
: about –20 dBm
: 0 dB
: –60 dBm (P-message filter unused)
RV4
10 k
RV1
100
1.2 k
10 µ
R7
R15
C9
C10
1 µ
: 5 kHz band white noise
: OFF
: voice
: OFF
0.1 µ
+
C13
2.2 k
R16
10 k
R8
0.1 µ
C14
MIC
: about –20 dBm
: OFF
: OFF
: –60 dBm (P-message filter unused)
J1
AG
U13LM4861
1
2
3
4
470 k
R17
10 p
C15
: voice
: 80 dB (A) (at 1 m)
: 5 cm
8
7
6
5
AG
5 V
SP
J3
MIC
FEDL7731-02-11
SP
MSM7731-02
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