ml7074-003 Oki Semiconductor, ml7074-003 Datasheet - Page 43

• 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 Delay Time
Cancelable echo delay time is as follows.
Memory addresses are shown below.
The method for calculating delay time is shown below.
Notes
OKI Semiconductor
Echo canceler
(1) Single echo canceler mode
(2) Dual echo canceler mode (operation of acoustic and line echo cancelers)
(1) Single echo canceler mode
(2) Dual echo canceler mode (operation of acoustic and line echo cancelers)
delay time [s] × 8000 = delay time data (HEX)
Example of 30 ms:
Single echo
Dual echo
canceler
canceler
mode
Condition
0.03 × 8000 = 240 (DEC)
Acoustic echo canceler
Line echo canceler operation is halted.
Acoustic echo canceler
Line echo canceler
Memory address of acoustic echo canceler delay time
Memory address of acoustic echo canceler delay time
Memory address of line echo canceler delay time
: Dual echo canceler mode condition
: Setting delay time condition
Acoustic echo canceler delay time + line echo canceler delay time ≤ 59 ms
0.5 ms steps (increment width)
: acoustic delay time + line delay time ≤ 59 ms
Default
Variable range
Default
Variable range
Default
Variable range
Echo canceler
Acoustic side
Acoustic side
= 00F0 (HEX)
Line side
Line side
: 59 ms
: 0.5 to 59 ms (in 0.5 ms steps)
: 44 ms
: 0.5 to 58.5 ms (in 0.5 ms steps)
: 15 ms
: 0.5 to 27 ms (in 0.5 ms steps)
Address
009Ah
009Bh
0099h
—
Default time
44 ms
15 ms
59 ms
—
: 0099h
: 009Ah
: 009Bh
Default data
01D8h
0160h
0078h
—
0.5 to 58.5 ms
0.5 to 27.0 ms
0.5 to 59.0 ms
FEDL7731-02-11
Changeable
MSM7731-02
range
—
43/54