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參數(shù)資料
| 型號： | MSM7575 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 元件分類： | Codec |
| 英文描述： | Multi-Function ADPCM CODEC(多功能ADPCM(自適應(yīng)差分脈沖編碼調(diào)制）編碼譯碼器) |
| 中文描述： | 多功能差分PcM編解碼器（多功能差分PcM（自適應(yīng)差分脈沖編碼調(diào)制）編碼譯碼器） |
| 文件頁數(shù)： | 8/25頁 |
| 文件大小： | 187K |
| 代理商： | MSM7575 |
8/25
Semiconductor
MSM7575
Voice Input
GSX2
VOXO
VOXI
Voice Output
VFRO
T
VXON
Presence
Detect
T
VXOFF
Absence
Detect (Hang-over time)
Normal Voice Signal
Decoded Time period
Background
Noise
(a) Transmit VOX Function Timing Diagram
(b) Receive VOX Function (CR6-B3: digital "0") Timing Diagram
(Presence)
(Presence)
(Presence)
(Absence)
(Absence)
(Presence)
Note:
VOXO, VOXI function become valid when setting CR6-B7 to digital “1”.
Figure 4 VOX Function
VOXO
Transmit VOX function signal output.
VOX function is to recognize the presence or absence of the transmit voice signal by detecting the
signal energy. “H” and “L” levels set to this pin correspond to the presence and the absence,
respectively. This result appears also at the register data 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 “H” level at VOXI indicates the presence of voice signal, the decoder block processes normal
receive signal, and the voice signal appears at analog output pins . The “L” level indicates the
absence of voice signal, 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”.
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