ml7074-003 Oki Semiconductor, ml7074-003 Datasheet - Page 45

• 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

Attenuation of ATT Function
The attenuation (ATT values) of echo canceler ATT functions (ATTsL/ATTrL, ATTsA/ATTrA) can be selected
from the following combinations. When selecting the attenuation, take note of the following.
1. Increasing the attenuation causes almost half duplex.
2. Increasing the attenuation causes the sound of the beginning and ending of words to be cut.
3. Increasing the attenuation remarkably changes the sound volume of background noise. (due to On/OFF of the
When selecting the following combinations by the method of internal data memory access, set the AATT and the
LATT pins and bits as follows:
In a case with the ECSEL pin = 1 or in a case with both the ECSEL pin = 0 and CR0-B1,0 = (1,1)
• The AATT pin and its bit (CR5-B1) = 0; the LATT pin and its bit (CR4-B1) = “Don’t care”
In a case with both the ECSEL pin = 0 and CR0-B1,0 = (1,0)
• The AATT pin and its bit (CR5-B1) = 0; the LATT pin and its bit (CR4-B1) = 0
Though it’s possible to set different attenuations for ATTsA and ATTrA and to set different attenuation for ATTsL
and ATTrL, the attenuation by ATTsA and ATTsL and the attenuation by ATTrA and ATTrL are always set the
same.
* default
* deafult
OKI Semiconductor
Address
Address
6 dB*
ATTs/ATTr)
0 dB
1 dB
2 dB
3 dB
4 dB
5 dB
7 dB
0 dB
1 dB
2 dB
3 dB
4 dB
019Ch
Data 2
5A9Dh
65ACh
5A9Dh
Data 1
7FFFh
50C3h
7FFFh
50C3h
47FAh
0199h
7214h
65Ach
7214h
4200h
4000h
Address
Data 3
019Fh
65ACh
5A9Dh
3B2Ch
6 dB *
7FFFh
50C3h
47FAh
7214h
4200h
5 dB
7 dB
8 dB
9 dB
2D6Ah
Data 1
47FAh
392Ch
0199h
4000h
32F5h
Data 4
01A2h
65ACh
5A9Dh
3B2Ch
7FFFh
50C3h
47FAh
7214h
4200h
Address
Data 5
10 dB
11 dB
12 dB
18 dB
24 dB
01A5h
65ACh
5A9Dh
7FFFh
50C3h
47FAh
392Ch
7214h
4000h
Data 1
287Ah
0199h
2413h
2000h
1000h
0800h
Address
10 dB
11 dB
12 dB
18 dB
24 dB
8 dB
9 dB
Data 2
019Ch
4000h
4000h
4000h
4000h
4000h
4000h
4000h
Data 3
2F6Ah
2A7Ah
019Fh
34F5h
2613h
2200h
2000h
2000h
2F6Ah
2A7Ah
Data 4
01A2h
34F5h
2613h
2200h
1200h
1000h
FEDL7731-02-11
MSM7731-02
2D6Ah
Data 5
01A5h
287Ah
32F5h
2413h
2000h
1000h
0800h
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