參數(shù)資料
型號(hào)： CXD2508AR
廠商： Sony Corporation
元件分類： 數(shù)字信號(hào)處理
英文描述： CD Digital Signal Processor
中文描述： CD數(shù)字信號(hào)處理器
文件頁(yè)數(shù)： 30/49頁(yè)
文件大?。?/td> 858K
代理商： CXD2508AR
– 30 –
CXD2508AQ/AR
3-2. Frame Sync Protection
In a CD player operating at normal speed, a frame sync is recorded approximately every 136μs (7.35kHz).
This signal is used as a reference to know which data is the data within a frame. Conversely, if the frame
sync can not be recognized, the data is processed as error data because it can not be recognized what the
data is. As a result, recognizing the frame sync properly is extremely important for improving playability.
In the CXD2508AQ/AR, window protection and forward protection/backward protection have been adopted
for frame sync protection. The adoption of these functions achieves very powerful frame sync protection.
There are two window widths: one for cases where a rotational disturbance affects the player and the other
for cases where there is no rotational disturbance (WSEL = 0/1). In addition, the forward protection counter is
fixed to 13, and the backward protection counter is fixed to 3. In other words, when the frame sync is being
played back normally and then can not be detected due to scratches, a maximum of 13 frames are inserted.
If frame sync can not be detected for 13 frames or more, the window is released and the frame sync is
resynchronized.
In addition, immediately after the window is released and resynchronization is executed, if a proper frame
sync can not be detected within 3 frames, the window is released immediately.
3-3. Error Correction
In the CD format, one 8-bit data contains two error correction codes, C1 and C2. For C1 correction, the code
is created with 28-byte information and 4-byte C1 parity.
For C2 correction, the code is created with 24-byte information and 4-byte parity.
Both C1 and C2 are Reed-Solomon codes with a minimum distance of 5.
The CXD2508AQ/AR SEC strategy provides excellent playability through powerful frame sync protection and
C1 and C2 error corrections.
The correction status can be monitored outside the LSI.
See Table 3-1.
When the C2 pointer is high, the data in question was uncorrectable. Either the pre-value was held for that
data, or an average value interpolation was made.
MNT3
0
0
0
1
1
1
MNT1
0
0
1
0
0
1
MNT0
0
1
1
0
1
1
Description
No C1 errors
One C1 errors corrected
C1 correction impossible
No C2 errors
One C2 errors corrected
C2 correction impossible
Table 3-1.
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