Recording medium frame synchronous detecting device and method
A recording medium and frame synchronization technology, applied in data recording, recording information storage, recording carrier parts, etc., can solve problems such as low efficiency, inconsistent frame synchronization and pseudo-synchronization signals, etc.
Inactive Publication Date: 2007-07-04
LEJIN GUANGDIAN ELECTRONIC CO LTD SHANGHAI
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0008] However, if there is a defect area in the recording medium, as shown in Figure 4, the frame synchronization detection time point corresponding to the above defect area is somewhat different from the normal detection time point, but it is also detected normally. At this time, because according to the normal The generation time of the periodically generated pseudo-synchronization signal at the detection time point is inconsistent with the above-mentioned detection time point, resulting in continuous inconsistency between the frame synchronization and pseudo-synchronization signals corresponding to the above-mentioned defect area, thereby continuously outputting low-potential GFS signals, resulting in reception The decoder of the above output signal refuses to perform the decoding operation, or repeatedly executes the frame sync detection action (Frame Sync Hunt Retry), resulting in low efficiency
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0017] Referring to the accompanying drawings, the device and method for detecting frame synchronization of recording media provided by the present invention will be described in detail through ideal embodiments.
[0018] Firstly, the device and method for detecting frame synchronization of recording media provided by the present invention can be applied to optical disc devices such as Blu-ray disc recorders or Blu-ray disc players. The optical disc device described above includes a demodulation unit 10, a decoding unit 11, and a synchronization signal detection unit 30, as shown in FIG.
[0019] The demodulation unit 10 demodulates the data stream read from the optical disc into a preset specific format, such as 17PP (De-modulation) demodulation. In the decoding unit 20, error correction (Error Correction) and decoding (Decoding) are performed on the demodulated data.
[0020] In the synchronization signal detection unit 30, as described above, a frame synchronization (Frame...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to a detecting device and method of recording medium synchronous frame. The recording medium synchronous frame detecting device provided in the invention detects the Frame Sync read from the recording medium such as Blue-ray Disc, at the same time, the Pseudo Sync signal is generated periodically, and the window with specific range is set in said Pseudo Sync signal, whether synchronous frame is detected within range of window, corresponding signal is output to detect Frame Sync more stably. Even if the defect area arisen in recording medium can lead to that there is difference between time that detects Pseudo Sync and normal situation, the Frame Sync will be detected normally to realize the stability of decoding action and avoid the detecting operation of repeating executing, the efficiency is improved.
Description
technical field [0001] The present invention relates to a recording medium frame synchronization detecting device and corresponding method, in particular, it aims to more accurately detect Frame Sync detection device and corresponding method for recording medium frame synchronization. Background technique [0002] Generally speaking, in a recording medium such as a Blu-ray disc, which can record and play high-quality video data and high-quality audio data for a long time, as shown in FIG. 1, a recording frame of 1288 data bits (Data bits) is recorded , each recording frame (Recording Frame) has four 38-bit LDC (LDC: Log Distance) code words, three 1-byte zone indication subcodes BIS (Burst Indicator Sub code), 20-bit frame synchronization and 28 1-bit DC controls (dc-control). [0003] The above-mentioned LDC codeword and the BIS codeword use different Reed-Solomon (Reed-Solomon) coding methods respectively: what the above-mentioned LDC codeword adopts is the RS (248, 216,...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): G11B20/10G11B27/00G11B7/00H04N5/91
Inventor 安晟根
Owner LEJIN GUANGDIAN ELECTRONIC CO LTD SHANGHAI