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參數(shù)資料
| 型號： | MSM7584C |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | π/4 Shift QPSK MODEM(π/4移動(dòng)QPSK調(diào)制解調(diào)器/ADPCM編碼譯碼器) |
| 中文描述： | π/ 4移位的QPSK調(diào)制解調(diào)器（π/ 4移動(dòng)的QPSK調(diào)制解調(diào)器/差分PcM編碼譯碼器） |
| 文件頁數(shù)： | 9/57頁 |
| 文件大?。?/td> | 321K |
| 代理商： | MSM7584C |
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Semiconductor
MSM7584C
9/57
VOXO
Transmit VOX function signal output.
VOX function is used to recognize the presence or absence of the transmit voice signal by
detecting the signal energy. "1" and "0" levels on this pin correspond to the presence and the
absence, respectively. This result also appears at the register CR7 - B7. The signal energy detect
threshold is set by the control register data CR6 - B6, B5.
VOXI
Signal input for receive VOX function.
The "1" level on 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. The "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. Because this signal is ORed with the register data CR6 - B3, the control register data
CR6 - B3 should be set to digital "0".
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 VOX Function Timing Diagram
(b) Receive Side VOX Function Timing Diagram
Regenerated voice signal
generation time
Internal background
noise generation time
Note: The VOXO and VOXI pin function are enabled when CR6 - B7 is set to "1".
Figure 2 VOX Function
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