MSM7731-02 OKI [OKI electronic componets], MSM7731-02 Datasheet - Page 39

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

B7 to B3 Reserved bits.
B2
B1, B0
1 Semiconductor
Initial Value
(13) CR12 (Reserved register)
CR12
NCSEL2
Noise attenuation selection control
This bit selects the noise attenuation of the noise canceler. In the “through mode”, the noise canceler is
halted and data is output directly. In the “normal mode” the noise canceler operates normally. Since the
noise attenuation in the normal mode is selected after the initial mode has been released, the change of
the noise attenuation during normal operation is invalid. If the noise attenuation is changed, reset
must be activated by the RDN/RST pin or the PDN/RST bit (CR0-B7). Changing to the through mode
during normal operation and returning to the normal mode are possible. This bit is internally ORed with
the NCSEL2. (Refer to the NCSEL1 pin of CR1-B0.)
Note:
0
1
1
0
Reserved bits.
B7
—
0
Since there is a trade-off between noise attenuation and sound quality after canceling
the noise, select the noise attenuation appropriate to the sound quality.
NCSEL1
B6
—
0
0
1
0
1
Modification of initial values is inhibited.
Modification of initial value is inhibited.
B5
—
0
Through Mode
Normal Mode
Normal Mode
Normal Mode
NC Mode
B4
—
0
B3
—
0
Attenuation (dB)
13.5
NCSEL2
17
—
8
B2
0
B1
—
0
FEDL7731-02-04
MSM7731-02
Quality
Better
Best
—
B0
—
0
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