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參數(shù)資料
| 型號： | 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)： | 10/38頁 |
| 文件大?。?/td> | 232K |
| 代理商： | MSM7708-02 |
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Semiconductor
MSM7708-02
10/38
VOXO
Transmit side voice/silence detect signal output.
This output is valid when CR6 - B7 is set to "1". VOXO shows the presence or absence of the
transmit voice signal by detecting the signal. "1" and "0" set to this pin correspond to the presence
and the absence, respectively. This result also appears at the register data CR7 - B7. The signal
detect threshold is set by the control register CR6 - B6, B5. When control register CR0 - B6 is set
to "1" and VOXI input is "1" during the voice detection (VOXO = "1"), receive signal is
automatically suppressed by 6 dB.
VOXI
Receive side voice/silence detect signal input.
This output is valid when CR6 - B7 is set to "1". A "1" level at VOXI indicates the presence of voice
signal, in which case the decoder block processes normal receive signal and the voice signal
appears at analog output pins. A "0" level indicates the absence of voice signal, in which case the
background noise generated in this device is transferred to the analog output pins. The
background noise amplitude is set by the control register CR6 - B1, B0. Since this signal is ORed
with the register CR6 - B3, set the control register CR6 - B3 to "0" when using this pin. When
control register CR0 - B6 is set to "1" and VOXI input is "1" during the voice detection (VOXO =
"1") receive signal is automatically suppressed by 6 dB.
Note:
The VOXO and VOXI pin functions are enabled when CR6 - B7 is set to "1".
Figure 2 Voice/Silence Detect Function
Input voice signal
GSX2
pin
Regenerated voice
VFRO
pin
VOXO pin
VOXI pin
Voice
Silence
Voice
Voice
Silence
Voice
Voice Detection Time
T
VXON
Silence Detection Time
(Hangover Time) T
VXOFF
(a) Transmission Side Voice/Silence Detect Function Timing Diagram
(b) Receive Side Voice/Silence Detect Function Timing Diagram
Regenerated Voice Signal
Generation Time
Internal Background
Noise Generation Time
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