MSM7584D 데이터 시트보기 (PDF) - Oki Electric Industry
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MSM7584D Datasheet PDF : 58 Pages
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¡ Semiconductor
FEDL7584D-02
MSM7584D
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
VOXO pin
Voice
Silence
Voice
Voice detection time
TVXON
Silence detection time
(Hangover time) TVXOFF
(a) Transmission Side VOX Function Timing Diagram
VOXI pin
Voice
Silence
Voice
Regenerated voice
VFRO pin
Regenerated voice signal Internal background
generation time
noise generation time
(b) Receive Side VOX Function Timing Diagram
Note: The VOXO and VOXI pin function are enabled when CR6 - B7 is set to "1".
Figure 2 VOX Function
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