參數(shù)資料
型號: MSM7630
廠商: OKI SEMICONDUCTOR CO., LTD.
英文描述: Universal Speech Processor(通用語音處理器)
中文描述: 通用語音處理器(通用語音處理器)
文件頁數(shù): 85/89頁
文件大?。?/td> 430K
代理商: MSM7630
MSM7630
Semiconductor
85/89
4. Speech Output Registers Address Configuration
The addresses used by the speech output registers/circuits are assigned at 0x80000000. Accesses to
this space will be 3
t
access.
0x80000000
0x80000004
0x80000008
0x8000000C
0x80000010
0x80000020
Speech Output Register 1
Speech Output Register 2
D/A Conversion Register
Status Register
General Register
MSM7576 Mode Select Register
Speech Output
1. Output Waveform from DAO1
The speech output pin directly outputs the output of the DA converter.
The output waveform from DAO1 will be a staircase synchronized to the sampling frequency.
Maximum output amplitude will be (4095/4096
V
DD
).
2. Output Filter
Because the output from DAO1 is a staircase described above, add a low-pass filter. The diagram
below shows a reference circuit for a Butterworth low-pass filter.
2
3+
R
R
1000p
300p
R
1200p
15
14+
13
16
4
0.1μ
R
R
2200p
220p
11
12+
9
10
1k
20k
47k
6
5+
7
8
1
1k
MC14573P
Butterworth low-pass filter
R = 47k, f=4.8kHz (95 model: for 12kHz sampling)
R = 36k, f=6.4kHz (96 model: for 16kHz sampling)
R = 27k, f=9.6kHz (97 model: for 22kHz sampling)
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