參數(shù)資料
型號(hào)： MSM7731-02
廠商： OKI SEMICONDUCTOR CO., LTD.
元件分類： Codec
英文描述： Dual Echo Canceler & Noise Canceler with Dual Codec for Hands-Free
中文描述： 雙回聲消除器
文件頁(yè)數(shù)： 39/43頁(yè)
文件大?。?/td> 247K
代理商： MSM7731-02
39/43
Semiconductor
MSM7731-01
Method of Internal Data Memory Access
So that the default values such as the cancelable echo delay time can be changed, contents of the
memory that stores default values can be modified during the initial mode (CR0-B1, CR0-B0 =
"00").
Refer to the procedure below.
1. Set the address of the default value store memory. (CR6, CR7)
2. Set the modified values (data). (CR8, CR9)
3. Set the write command. (CR1-B7 = "1")
After the write operation is complete, the write command (CR1-B7) is cleared to "0". Consecutive
writes are possible.
Echo Canceler Delay Time
Cancelable echo delay time is as follows.
(1) Single echo canceler mode
Acoustic echo canceler
Default: 59 ms
Variable range: 0.5 to 59 ms (in 0.5 ms steps)
Line echo canceler operation is halted.
(2) Dual echo canceler mode (operation of acoustic and line echo cancelers)
Condition: acoustic delay time + line delay time
≤
59 ms
Acoustic echo canceler
Default: 44 ms
Variable range: 0.5 to 58.5 ms (in 0.5 ms steps)
Line echo canceler
Default: 15 ms
Variable range: 0.5 to 27 ms (in 0.5 ms steps)
Memory addresses are shown below.
(1) Single echo canceler mode
Memory address of acoustic echo canceler delay time: 009DH
(2) Dual echo canceler mode
Memory address of acoustic echo canceler delay time: 009BH
Memory address of line echo canceler delay time: 009CH
The method for calculating delay time is shown below.
delay time [s]
￥
8000 = delay time data (HEX)
Example of 30 ms:
0.03
￥
8000 = 240 (DEC)
= 00F0 (HEX)
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