參數(shù)資料
型號(hào)： MSM7708-02
廠商： OKI SEMICONDUCTOR CO., LTD.
元件分類： Codec
英文描述： Serial Register Interface ADPCM CODEC for Telephone Recording(用于電話記錄的串行寄存器接口ADPCM編碼譯碼器)
中文描述： 串行接口差分PcM注冊(cè)解碼器的電話錄音（用于電話記錄的串行寄存器接口差分PcM編碼譯碼器）
文件頁數(shù)： 24/38頁
文件大?。?/td> 232K
代理商： MSM7708-02
Semiconductor
MSM7708-02
24/38
(3) CR2 (PCM CODEC Operation Mode Settings and Transmit/Receive Gain Adjustment)
B7, B6, B5, B4: ....Transmit side signal gain adjustment (refer to Table 2)
B3, B2, B1, B0: ....Receive side signal gain adjustment (refer to Table 2)
Table 2 Transmit/Receive Gain Settings
The above gain settings table shows the transmit/receive voice signal gain settings and the
transmit side gain settings for DTMF tones and other tones. Tone signal transmission is enabled
by CR4 - B6 (discussed later), and the gain setting is set to the levels shown below.
DTMF tones (low group):.................................–16 dBm0
DTMF tones (high group) and other tones:...–14 dBm0
For example, if the transmit gain set value is set to +8 dB (B7, B6, B5, B4) = (0, 1, 0, 0), then the
following tones appear at the PCMSO pin.
DTMF tones (low group):.................................–8 dBm0
DTMF tones (high group) and other tones:...–6 dBm0
However, the gain of the receive side tone and the gain of the side tones (path from transmit side
to receive side) are set by the CR3 register.
B7
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
B6
0
1
0
0
1
1
1
1
0
0
0
0
1
1
1
1
B5
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
B4
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Transmit Side Gain
–16 dB
–14 dB
–12 dB
–10 dB
–8 dB
–6 dB
–4 dB
–2 dB
0 dB
+2 dB
+4 dB
+6 dB
+8 dB
+10 dB
+12 dB
+14 dB
B3
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
B2
0
1
0
0
1
1
1
1
0
0
0
0
1
1
1
1
B1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
B0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Receive Side Gain
–16 dB
–14 dB
–12 dB
–10 dB
–8 dB
–6 dB
–4 dB
–2 dB
0 dB
+2 dB
+4 dB
+6 dB
+8 dB
+10 dB
+12 dB
+14 dB
CR2
Initial value
TX
GAIN3
0
B7
TX
GAIN2
0
B6
TX
GAIN1
0
B5
TX
GAIN0
0
B4
RX
GAIN3
0
B3
RX
GAIN2
0
B2
RX
GAIN1
0
B1
RX
GAIN0
0
B0
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