參數資料
型號: STV8227
廠商: 意法半導體
英文描述: Digital Audio Decoder/Processor for A2 and NICAM Television/Video Recorders
中文描述: 數字音頻解碼器/處理器為A2和麗音電視/錄像機
文件頁數: 92/149頁
文件大小: 2775K
代理商: STV8227
Register List
STV82x7
92/149
PEAK_DET_R
Peak Level Detector Status Register (R channel)
PEAK_DET_L_R
Peak Level Detector Status Register (L - R)
Bit Name
Reset
Function
OVERLOAD_L[7]
0
Memorise overload on the peak detection. This field can be reset.
PEAK_L[6:0]
00000000
Displays the
Absolute Peak Level
of the audio source selected. The measured value is
updated continuously every 64 ms. The range varies linearly from the full scale (0 dB) down to 1/
256 of the full scale (-48 dB).
In AM/FM Mono mode, only the PEAK_L[7:0] value must be taken into account.
In FM Mono mode, the audio peak level range depends upon the programmed FM bandwidth.
The unique difference is that the measurement is done after Sound pre-processing (DC offset
removal, Prescaling, De-emphasis and Dematrixing).
In FM Stereo mode, the maximum value may be used to check if the incoming signal level is
correctly adjusted by the prescaling factor or if there are no FM overmodulation problems
(clipping).
Programmable values are listed in
Table 20
.
Address: 9Fh
Type: R
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
OVERLOAD_R
PEAK_R[6:0]
Bit Name
Reset
Function
OVERLOAD_R[7]
0
Memorise overload on the peak detection. This field can be reset.
PEAK_R[7:0]
0000000
Displays the
Absolute Peak Level
of the audio source selected. The measured value is
updated continuously every 64 ms. The range varies linearly from the full scale (0 dB) down to
1/256 of the full scale (-48 dB).
For more information, refer to register
PEAK_DET_L
.
Address: A0h
Type: R
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
OVERLOAD_L_R
PEAK_L_R[6:0]
Bit Name
Reset
Function
OVERLOAD_L_R[7] 0
Memorise overload on the peak detection. This field can be reset.
PEAK_L_R[7:0]
0000000
Displays the
Difference between L and R (L - R) channels
for the audio source selected.
For more information, refer to register
PEAK_DET_L
.
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