CN1992048A - Recording medium frame synchronous detecting device and method - Google Patents
Recording medium frame synchronous detecting device and method Download PDFInfo
- Publication number
- CN1992048A CN1992048A CN 200510112481 CN200510112481A CN1992048A CN 1992048 A CN1992048 A CN 1992048A CN 200510112481 CN200510112481 CN 200510112481 CN 200510112481 A CN200510112481 A CN 200510112481A CN 1992048 A CN1992048 A CN 1992048A
- Authority
- CN
- China
- Prior art keywords
- frame synchronization
- mentioned
- recording medium
- pseudo
- window
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Signal Processing For Digital Recording And Reproducing (AREA)
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
The present invention relates to a kind of recording medium frame synchronous detecting device and correlation method, particularly, be for from such as the recording medium frame synchronous detecting device and the correlation method that more accurately detect frame synchronization (Frame Sync) in the data stream of reading the Blu-ray Disc high density recording mediums such as (BD:Blue-ray Disc).
Background technology
Generally speaking, can non-volatile recording as Blu-ray Disc etc. and play in the recording medium of voice data of the video data of high image quality and high tone quality, as shown in Figure 1, record the record frame of 1288 data bits (Data bits), LDC (LDC:Log Distance) coded word that has 4 38 bits on each record frame (Recording Frame), the position indication subcode BIS (Burst Indicator Sub code) of 31 bytes, the DC control (dc-control) of the frame synchronization of 20 bits and 28 1 bits.
Above-mentioned LDC coded word and BIS coded word use respectively in different Saloman (Reed-Solomon) coded system: that above-mentioned LDC coded word adopts is RS (248,216,33) coded system, that above-mentioned BIS coded word then adopts is RS (62,30,33) coded system.
In as optical disc apparatus such as Blu-ray Disc CD writer or Blu-ray Disc players, in the process that the record frame of reading from CD is decoded, the frame synchronization of above-mentioned 20 bits is significant as the signal of the time point of pointing out to decode.
On the one hand in as optical disc apparatus such as Blu-ray Disc CD writer or Blu-ray Disc players, for carrying out decode operation, as shown in Figure 2, when detecting the frame synchronization (Frame Sync) of from recording medium, reading, promptly on the time point that should detect frame synchronization, also periodically produce pseudo-synchronous signal (Pseudo Sync).
Above-mentioned frame synchronization and pseudo-synchronous signal are compared, as shown in Figure 2, if frame synchronization is all consistent with pseudo-synchronous signal, with output noble potential GFS (Good Frame Sync correspondingly, good frame synchronization) signal, after the demoder prompting normally detected frame synchronization, demoder was carried out decode operation with reference to the GFS signal.
Perhaps, as shown in Figure 3, the result of above-mentioned frame synchronization and pseudo-synchronous signal comparison is that only some is inconsistent, and at this moment, the GFS of output (Good Frame Sync) signal major part is a high potential signal, has only part to be low-potential signal.In the demoder that receives above-mentioned output signal, if most frame synchronization is consistent with pseudo-synchronous signal, the demoder judgment frame detects normally synchronously, thereby also carries out normal decoding action.
If but partly there is defect area in recording medium, as shown in Figure 4, the pairing frame synchronization of above-mentioned defect area detects time point than normally detecting some difference of time point, but also normally detected, at this moment, because the generation time point and the above-mentioned time point that detects of the pseudo-synchronous signal that periodically produces according to normally detecting time point are inconsistent, cause pairing frame synchronization of above-mentioned defect area and pseudo-synchronous signal inconsistent continuously, thereby export electronegative potential GFS signal continuously, the demoder refusal that causes receiving above-mentioned output signal is carried out decode operation, or repeat frame synchronization and detect action (Frame Sync Hunt Retry), cause inefficiency.
Summary of the invention
Therefore, the present invention provides a kind of frame synchronous detecting device and method of recording medium for addressing the above problem.Apparatus and method provided by the present invention, when detecting the frame synchronization (Frame Sync) of from the recording medium that is similar to Blu-ray Disc etc., reading, periodically produce pseudo-synchronous signal (Pseudo Sync), on above-mentioned pseudo-synchronous signal, set the WINDOW (window) of particular range, by comparing, thereby more accurately detect frame synchronization (Frame Sync) with frame synchronization.
For achieving the above object, may further comprise the steps according to recording medium frame synchronization method for detecting provided by the present invention, and as characteristics: first step: detect the frame synchronization of from recording medium, reading; Second step: produce the pseudo-synchronous signal corresponding with above-mentioned frame synchronization; Third step: after in above-mentioned pseudo-synchronous signal, setting the window of particular range, in the window ranges of setting, judge whether to detect frame synchronization, and produce corresponding signal thus.
Simultaneously, recording medium frame synchronous detecting device provided by the present invention is characterized in that comprising: the detection device that detects the frame synchronization of reading from recording medium; Produce the pseudo-synchronous signal generation device of the pseudo-synchronous signal corresponding with above-mentioned frame synchronization; After in above-mentioned pseudo-synchronous signal, setting the window of particular range, in the window ranges of setting, judge whether to detect frame synchronization, and produce the detection device of corresponding signal thus.
Description of drawings
Fig. 1 is record frame (Recording Frame) pie graph of common recording medium.
Fig. 2 and Fig. 3 are the synoptic diagram that normal frames detects process synchronously.
Fig. 4 is that normal frames detects in the process synchronously, the synoptic diagram of error example occurs.
Fig. 5 and Fig. 6 are the frame synchronous detecting device pie graphs of recording medium provided by the invention.
Fig. 7 is the frame synchronization method for detecting according to recording medium provided by the present invention, detects the synoptic diagram of frame synchronization embodiment.
Embodiment
With reference to the accompanying drawings, by desirable embodiment, recording medium frame synchronous detecting device provided by the invention and method are elaborated.
At first, recording medium frame synchronous detecting device provided by the invention and method can be applied to as in the optical disc apparatus such as Blu-ray Disc video recorder or Blu-ray Disc player.Above-mentioned optical disc apparatus comprises demodulation section 10 as shown in Figure 5, lsb decoder 11, synchronizing signal detecting element 30.
The data stream that above-mentioned demodulation section 10 will be read from CD is demodulated to the specific format of prior setting, as carrying out demodulation with 17PP (De-modulation) demodulation mode.In above-mentioned lsb decoder 20, to carry out error correction (Error Correction) and decoding (Decoding) through above-mentioned demodulated data.
In above-mentioned synchronizing signal detecting element 30, as mentioned above, detect the frame synchronization (Frame Sync) that plays an important role as instruction decoding time point signal.As shown in Figure 6, above-mentioned synchronizing signal detecting element 30 comprises frame synchronization detector 300, pseudo-synchronous signal generator 301, and GFS generator 302.
Simultaneously, in above-mentioned frame synchronization detector 300, detect the frame synchronization (FrameSync) of from recording medium, reading, in above-mentioned pseudo-synchronous signal detector 301, on the time point that should detect above-mentioned frame synchronization, periodically produce pseudo-synchronous signal.In above-mentioned pseudo-synchronous signal detector 301, as shown in Figure 7, before and after pseudo-synchronous signal, set the window of particular range.
In above-mentioned GFS generator 302, under the state of the window of setting particular range on the above-mentioned pseudo-synchronous signal, suppose in the scope of window, to detect this moment above-mentioned frame synchronization, then the output prompting normally detects the noble potential GFS signal of frame synchronization, receive the above-mentioned GFS signal of 20 references of lsb decoder of above-mentioned noble potential GFS signal, determine normally detect frame synchronization after, carry out normal decode operation.
On the contrary, under the state of the window of setting particular range on the above-mentioned pseudo-synchronous signal, suppose in the scope of window, not detect this moment above-mentioned frame synchronization, then the output prompting does not detect the electronegative potential GFS signal of frame synchronization, carry out the action that detects frame synchronization afterwards once more, the lsb decoder 20 that receives above-mentioned low level GFS signal is with reference to above-mentioned GFS signal, and refusal is carried out decode operation.
Perhaps as shown in Figure 7, defect area partly appears in recording medium, the pairing frame synchronization of above-mentioned defect area detects some difference of time point normal condition, but also normally detected, at this moment, the generation time point and the above-mentioned time point that detects of the pseudo-synchronous signal that periodically produces according to normally detecting time point are inconsistent, but, however, because the pairing frame synchronization of above-mentioned defect area is present in the window that sets in above-mentioned pseudo-synchronous signal, thereby also can export continuous noble potential GFS signal.
Afterwards, the lsb decoder 302 that receives above-mentioned output signal will normally be carried out the decoding action, thereby prevent to detect the operation once more (Frame Sync Hunt Retry) of frame synchronization effectively, improve efficient.
By above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.Therefore, the technical scope of this invention is not limited to the content on the instructions, must determine its technical scope according to interest field.
The effect of invention
As mentioned above, recording medium frame synchronous detecting device of the present invention is detecting from being similar to Blu-ray Disc In the time of the frame synchronization (Frame Sync) of reading in the recording medium of (Blue-ray Disc) etc., real estate periodically Give birth to pseudo-synchronous signal (Pseudo Sync), at the window of above-mentioned pseudo-synchronous signal setting particular range, at window Scope in judge whether to detect frame synchronization (Frame Sync), produce simultaneously corresponding signal, thus more stable Detect frame synchronization. The defect area that recording medium was partly occurred causes when respective regions detects frame synchronization Point is than some difference of normal condition, and frame synchronization also will normally be detected, thereby realizes the stability of decoding action, And prevented from repeating the operation that detects of frame synchronization, improved efficient.
Claims (11)
1, a kind of recording medium frame synchronization method for detecting is characterized in that may further comprise the steps:
First step: detect the frame synchronization of from recording medium, reading;
Second step: produce the pseudo-synchronous signal corresponding with above-mentioned frame synchronization;
Third step: after in above-mentioned pseudo-synchronous signal, setting the window of particular range, in the window ranges of setting, judge whether to detect frame synchronization, and export corresponding signal thus.
2, recording medium frame synchronization method for detecting as claimed in claim 1 is characterized in that,
In the above-mentioned first step, the data stream of reading from Blu-ray Disc is carried out demodulation with the 17PP demodulation mode, is detecting frame synchronization in data after demodulating stream.
3, recording medium frame synchronization method for detecting as claimed in claim 1 is characterized in that,
In above-mentioned second step, on the time point that should detect above-mentioned frame synchronization, periodically produce pseudo-synchronous signal.
4, recording medium frame synchronization method for detecting as claimed in claim 1 is characterized in that,
When in above-mentioned pseudo-synchronous signal, window being set, should in the particular range before above-mentioned pseudo-synchronous signal produces time point, set.
5, recording medium frame synchronization method for detecting as claimed in claim 1 is characterized in that,
When in above-mentioned pseudo-synchronous signal, window being set, should in the particular range after above-mentioned pseudo-synchronous signal produces time point, set.
6, recording medium frame synchronization method for detecting as claimed in claim 1 is characterized in that,
When in above-mentioned pseudo-synchronous signal, window being set, should in the front and back particular range of above-mentioned pseudo-synchronous signal generation time point, set.
7, recording medium frame synchronization method for detecting as claimed in claim 1 is characterized in that,
In above-mentioned third step, in above-mentioned pseudo-synchronous signal, behind the window of setting particular range,, then produce noble potential GFS signal if in window ranges, detect frame synchronization; If in window ranges, do not detect frame synchronization, then produce electronegative potential GFS signal.
8, a kind of recording medium frame synchronous detecting device is characterized in that comprising:
Detect the detection device of the frame synchronization of from recording medium, reading;
Produce the pseudo-synchronous signal generation device of the pseudo-synchronous signal corresponding with above-mentioned frame synchronization;
After in above-mentioned pseudo-synchronous signal, setting the window of particular range, in the window ranges of setting, judge whether to detect frame synchronization, and export the means that detect of corresponding signal thus.
9, recording medium frame synchronous detecting device as claimed in claim 8 is characterized in that,
Above-mentioned detection device, the data stream of reading from Blu-ray Disc is carried out demodulation with the 17PP demodulation mode, is detecting frame synchronization in data after demodulating stream.
10, recording medium frame synchronous detecting device as claimed in claim 8 is characterized in that,
In above-mentioned generation means, on the time point that should detect above-mentioned frame synchronization, periodically produce pseudo-synchronous signal.
11, recording medium frame synchronous detecting device as claimed in claim 8 is characterized in that,
In above-mentioned generation means, in above-mentioned pseudo-synchronous signal, behind the window of setting particular range,, then produce noble potential GFS signal if in window ranges, detect frame synchronization; If in window ranges, do not detect frame synchronization, then produce electronegative potential GFS signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510112481 CN1992048A (en) | 2005-12-30 | 2005-12-30 | Recording medium frame synchronous detecting device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510112481 CN1992048A (en) | 2005-12-30 | 2005-12-30 | Recording medium frame synchronous detecting device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1992048A true CN1992048A (en) | 2007-07-04 |
Family
ID=38214242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510112481 Pending CN1992048A (en) | 2005-12-30 | 2005-12-30 | Recording medium frame synchronous detecting device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1992048A (en) |
-
2005
- 2005-12-30 CN CN 200510112481 patent/CN1992048A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR20070025145A (en) | Soft decoding method and apparatus therefore and error correction method and apparatus therefore, soft output method and apparatus therefore | |
| JPS6276825A (en) | Code error correcting method | |
| US7974168B2 (en) | Data storage medium reproducing device and method for reproducing data storage medium | |
| CN1643598A (en) | Method of correcting data on a high-density recording medium | |
| US20070073931A1 (en) | Audio player and method for playing audio data | |
| CN1992048A (en) | Recording medium frame synchronous detecting device and method | |
| US8065494B2 (en) | Reproduction device and reproducing method | |
| JPH0795538A (en) | Image recording and reproducing device | |
| JP2007035170A (en) | Optical disk device, and method for reproducing optical disk | |
| KR100269507B1 (en) | Disk reproducer and signal processing circuit | |
| KR20060074458A (en) | Apparatus and method for detecting frame sync of high density optical disc | |
| KR100548223B1 (en) | Burst Error Detection Device and Detection Method of Magnetic Recording & Reproducing Equipment | |
| JP2001273719A (en) | Method and system for detecting medium defect and information recording and reproducing device using them | |
| KR100266370B1 (en) | Data reproducing method | |
| KR100294168B1 (en) | Error correction device and its method in magnetic recording and playback equipment | |
| JP2001126201A (en) | Defect inspecting method, defect inspecting device, signal recording and reproducing device, and signal recording medium | |
| Liu et al. | Error-correction codes for optical disk storage | |
| KR0152771B1 (en) | Error detecting device for digital magnetic recording/reproducing player | |
| JPH06124548A (en) | Data reproduction device | |
| KR100579594B1 (en) | Playback method for digital video disk | |
| WO2008093423A1 (en) | Data signal processing apparatus and method | |
| JPH11265552A (en) | Cd reproducing device | |
| JPH1153847A (en) | Recording/reproducing device and method therefor | |
| CN1992058A (en) | High-density CD error correcting code decoding device and method | |
| JPH10188484A (en) | Synchronism detecting circuit for compressed data |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |