CN101276629B - Method and related system for playing audio signal - Google Patents
Method and related system for playing audio signal Download PDFInfo
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- CN101276629B CN101276629B CN2007100914987A CN200710091498A CN101276629B CN 101276629 B CN101276629 B CN 101276629B CN 2007100914987 A CN2007100914987 A CN 2007100914987A CN 200710091498 A CN200710091498 A CN 200710091498A CN 101276629 B CN101276629 B CN 101276629B
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Abstract
A method for playing audio signals comprises reading a compression digital audio signal on an optical disk when the amount of data stored in a buffer region is lower than an object level; decoding the compression digital audio signal to generate a decompression digital audio signal; storing the decompression digital audio signal in the buffer region; stopping reading the data on the optical disk when the amount of the data stored in the buffer region is equal to the amount of data capable of being stored in the buffer region; setting the object level based on system data of the decompression digital audio signal; converting the decompression digital audio signal of the buffer region into an analog audio signal; converting the analog audio signal into a sound signal; and outputting the sound signal.
Description
Technical field
The present invention relates to a kind of method of playing audio signal, more particularly, particularly relate to a kind of method of coming playing audio signal with the target rank of adjusting buffer zone.
Background technology
Please refer to Fig. 1.Fig. 1 is the synoptic diagram of the optical disk system 100 of explanation prior art.As shown in the figure, optical disk system 100 comprise a servo-drive system 102, a code translator 103, a buffer zone (buffer) 104, a judging unit 107, one minute multiplexer 108, a decompressing device 109 and a digital analog converter (digital/analog converter, DAC).Servo-drive system 102 is in order to read compression digital audio frequency signal stored on the CD 101, the 3rd layer of (movie pictureexperts group 1 layer 3 as Motion Picture Experts Group 1, MP3) or unpressed digital audio and video signals, as optical disc digital audio frequency (compact disc digital audio).Code translator 103 is coupled to servo-drive system 102, in order to receive signal and the decoding generation decoding digital audio that servo-drive system 102 is read.Buffer zone 104 is coupled to code translator 103 and servo-drive system 102, the decoding digital audio that is sent in order to storage decoder 103, and according to the size of stored data volume, Control Servo System 102.For instance, when stored data volume equals 104 data volumes that can store of buffer zone, then close servo-drive system 102 and make servo-drive system 102 stop to read the data on the CD 101.And, then start servo-drive system 102 when stored data volume during less than a target rank, make servo-drive system 102 begin to read the data on the CD 101.Judging unit 107 is coupled to code translator 103, whether belongs to the CDDA or the data of other compressed format in order to judge the signal that code translator 103 is deciphered out, and transmits a control signal and give branch multiplexer 108.Dividing multiplexer 108 to comprise an input end I is coupled to buffer zone 104, an output terminal 01 and is coupled to that digital/analog converter 105, an output terminal 02 are coupled to decompressing device 109, a control end C is coupled to judging unit 107, in order to control signal, the data that are stored in buffer zone 104 are sent to decompressing device 109 or digital/analog converter 105 according to judging unit 107.Judge that when judging unit 107 digital audio and video signals of deciphering out is what not compress, then will divide the input end I of multiplexer 108 to be coupled to output terminal 01, therefore, the decoding digital audio of coming out from buffer zone 104 will directly enter digital/analog converter 105; When judging unit 107 judges that the digital audio and video signals of deciphering out is what to compress, then will divide the input end I of multiplexer 108 to be coupled to output terminal 02, therefore, the decoding digital audio of coming out from buffer zone 104 will enter decompressing device 109, after decompressing, just enter digital/analog converter 105.Digital/analog converter 105 is coupled to buffer zone 104 and decompressing device 109, and the decompression decoding digital audio that is transmitted in order to decoding digital audio that buffer zone 104 is stored or decompressing device 109 is converted to simulated audio signal and exports to a loudspeaker 106.Loudspeaker 106 is converted to a voice signal with the simulated audio signal that is received again.The optical disk system 100 of prior art via loudspeaker 106, plays back compression digital audio frequency signal stored on the CD just in this way.
Please refer to Fig. 2.Fig. 2 is the synoptic diagram of the buffer zone 104 of explanation prior art.As shown in the figure, default one fixing target rank (level) T is arranged in the buffer zone 104.For instance, if buffer zone 104 storable data volumes are that (megabyte, MB), then can establish the target rank is 50% to 10 megabits, that is 5 megabits.And when buffer zone 104 stored data volume D equal 10 megabits, (buffer zone 104 is full promptly to represent to equal 104 data volumes that can store of buffer zone by buffer zone 104 stored data volume D, can't receive data again), then buffer zone 104 is closed servo-drive system 102 and is made servo-drive system 102 stop to read the data on the CD 101.So, therefore buffer zone 104 just can not produce the situation that data are overflowed.If the situation that data are overflowed takes place in buffer zone 104, to have so that the part decoding digital audio is lost and can't be converted into voice output via digital/analog converter 105 and loudspeaker 106, then the sound exported of loudspeaker 106 can't be continuous, so just can reduce the performance of optical disk system 100.And as the stored data volume D of buffer zone 104 during less than 5 megabits, promptly represent the target rank of the stored data volume D of buffer zone 104 less than buffer zone 104, then buffer zone 104 starts servo-drive systems 102 and makes servo-drive system 102 begin to read the data on the CD 101.So, buffer zone 104 state that no datat stores that just can therefore not be cleared.And if when state that buffer zone 104 generation data are cleared, represent that at this time digital/analog converter 105 does not receive decoding digital audio, also therefore can't export simulated audio signal, and then make that loudspeaker 106 can't output sound, and the state of generation staccato so also can reduce the performance of optical disk system 100.
And in general, the speed of servo-drive system 102 data streams reads can be the twice (not necessarily twice can be any multiple, see how the speed that disc is play designs) of the speed of digital/analog converter 105 output datas.That is to say that for buffer zone 104, under the state that servo-drive system 102 continues to read, the speed that buffer zone 104 receives data can be to transmit the twice of data speed.Therefore, under normal condition, if servo-drive system 102 continues to read data on the CD, then the size of stored data volume D will continue to rise full and stop the action that servo-drive system 102 reads up to buffer zone 104 in the buffer zone 104.
With reference to figure 3.Fig. 3 for explanation when the synoptic diagram of the stored data volume D of buffer zone 104 less than the situation of target rank T.As shown in the figure, the stored data volume D of buffer zone 104 is less than target rank T.Then buffer zone 104 starts servo-drive systems 102 and makes servo-drive system 102 begin to read data on the CD 101 and the just sustainable increase of data volume D like this.
With reference to figure 4.Fig. 4 equals the synoptic diagram of the situation of 104 data volumes that can store of buffer zone as buffer zone 104 stored data volume D for explanation.Then buffer zone 104 is closed servo-drive system 102 and is made servo-drive system 102 stop to read the data on the CD 101.So still can continue the data of send buffer 104, so data volume D can continue just to descend owing to digital/analog converter 105.
Therefore, can find out from Fig. 3,4 that the height that target rank T sets can have influence on the frequency that servo-drive system 102 starts.For instance, it is high more that target rank T sets, and T is near more from the storable data volume of buffer zone for expression target rank, that is to say, after stopping servo-drive system 102, it is short more that data volume D reduces to the time of target rank T when data volume is full, and meaning is that the frequency of servo-drive system 102 startups is high more.And that target rank T sets is low more, and then the frequency that starts of servo-drive system 102 is low more.And start servo-drive system 102 at every turn, and all need certain electric energy, therefore, require more in the design of power saving now, can be inclined to and reduce the frequency that starts servo-drive system 102.That is to say, low more as if what target rank T was established, then can get over power saving.
Yet,, when causing the data of servo-drive system 102 on reading CD 101, produce difficulty because CD 101 sometimes may be by scratch or other external force factor.For instance, script servo-drive system 102 is 2 times of digital/analog converter 105 output speeds in the speed that reads CD 101 data, when servo-drive system 102 was reading on the CD 101 by the data above the part of scratch, data just can desultoryly enter buffer zone 104.At this moment, what of stored data volume D in the buffer zone 104 will have influence on optical disk system 100 and whether can export staccato.If data volume D is many more, then read on the CD 101 by the part of scratch with regard to there being many more surge time to offer servo-drive system 102.And if data volume D is few more, then Huan Chong time just short more, the probability of generation staccato is also high more.Therefore, under these circumstances, with the target rank T of buffer zone 104 establish high more, the probability that produces staccato is also just low more.
Therefore, in the optical disk system 100 of prior art, if with the target rank T of buffer zone 104 establish high more, though then can reduce the probability of staccato, also improved the power consumption of total system simultaneously; And if target rank T is reduced, though then can reduce power consumption, but improved the probability of staccato, thus the optical disk system 100 of prior art, and can't take into account power consumption and staccato problem simultaneously, reduced user's convenience.
Summary of the invention
The invention provides a kind of method of playing audio signal.This method comprises when the stored data volume of a buffer zone is lower than a target rank, begins to read the compression digital audio frequency signal on the CD; With this compression digital audio frequency signal interpretation to produce a decompression digital audio and video signals; Should be stored in this buffer zone by the decompression digital audio and video signals; When the stored data volume of this buffer zone equals data volume that this buffer zone can store, stop to read this optical disc data; According to the system data of this decompression digital audio and video signals, set other size of this target level; Convert the decompression digital audio and video signals that is stored in this buffer zone to a simulated audio signal; Convert this simulated audio signal to a voice signal; And export this voice signal.
Other disc-playing system of target level that the present invention also provides a kind of tool can adjust buffer zone.This Play System comprises a servo-drive system, comprises a control end, in order to receive a reading command or a halt instruction; One reads end, in order to read the data on the CD; Reach one first output terminal, read the data on the disc in order to export; Wherein after this servo-drive system received this reading command, this servo-drive system read the data on this CD; Wherein after this servo-drive system received this halt instruction, this servo-drive system stopped to read the data on this CD; One code translator is coupled to the output terminal of this servo-drive system, read data on the disc in order to receive this servo-drive system, and decoding produces a decoding data; One pick-up unit is coupled to this code translator, promotes instruction in order to detect the system data in this decoding data and to produce one; One judging unit is coupled to this code translator, in order to judge that decoding data that this code translator produces is whether through overcompression and produce a decision instruction; One can adjust other buffer zone of target level, comprises an input end, is coupled to this code translator, in order to receive this decoding data; One first control end is coupled to the control end of this servo-drive system, obtains this halt instruction in order to send this reading command; One second control end is coupled to this pick-up unit, in order to receive this lifting instruction; And an output terminal, in order to export stored decoding data; And wherein can adjust other buffer zone of target level when this and receive this lifting when instructing, promote the target water level that this can adjust other buffer zone of target level; Wherein when this can be adjusted the stored decoding data of other buffer zone of target level and is lower than this target rank that can adjust other buffer zone of target level, this can be adjusted other buffer zone of target level and send this reading command; Wherein when this can be adjusted the stored decoding data of other buffer zone of target level and equals this and can adjust the data volume that other buffer zone of target level can store, this can be adjusted other buffer zone of target level and send this reading command; One decompressing device is in order to decompress to this decoding data; One digital analog converter is in order to receive decoding data and to convert a sound signal to; And one fen multiplexer, comprise an input end, be coupled to this and can adjust other buffer zone of target level; One first output terminal is coupled to a decompressing device; One second output terminal is coupled to this digital analog converter; And a control end, be coupled to this judging unit, in order to receive this decision instruction; Wherein this minute multiplexer the first input end or second input end be coupled to this input end according to the decision instruction that this control end received.
Description of drawings
Fig. 1 is the synoptic diagram of the optical disk system of explanation prior art.
Fig. 2 is the synoptic diagram of the buffer zone of explanation prior art.
Fig. 3 works as the synoptic diagram of the stored data volume of buffer zone less than other situation of target level for explanation.
Fig. 4 equals the synoptic diagram of the situation of the data volume that buffer zone can store when the stored data volume of buffer zone for explanation.
Fig. 5 is the explanation synoptic diagram of adjusting other buffer zone of target level of the present invention.
Fig. 6 adjusts the target level of other buffer zone of target level and you can well imagine the synoptic diagram that rises for explanation is of the present invention.
Fig. 7 adjusts the synoptic diagram of the target rank reduction of other buffer zone of target level for explanation is of the present invention.
Fig. 8 is the synoptic diagram of optical disk system of the present invention.
Fig. 9 is the method flow diagram of explanation with optical disk system broadcast of the present invention.
The reference numeral explanation
100 800 optical disk systems
102 servo-drive systems
103 code translators
104 buffer zones
105 digital/analog converters
106 loudspeakers
107 judging units
108 fens multiplexers
109 decompressing devices
101 CDs
807 pick-up units
The 901-909 step
T target rank
The D data volume
T0 T1 target rank setting value
Embodiment
Please refer to Fig. 5.Fig. 5 is the explanation synoptic diagram of adjusting other buffer zone 504 of target level of the present invention.In order to solve the problem of power saving and staccato, the present invention promptly proposes a kind of other buffer zone 504 of target level of adjusting.As shown in the figure, the target rank T of buffer zone 504 can upwards promote or reduction downwards, changes the frequency of servo-drive system startup and the size of storage data amount D by this.In addition, of the present invention adjust other buffer zone 504 of target level can a dynamic RAM (dynamic randomaccess memory DRAM) realizes.
Please refer to Fig. 6.Fig. 6 adjusts the target level of other buffer zone 504 of target level and you can well imagine the synoptic diagram that rises for explanation is of the present invention.As shown in the figure, the target rank T of buffer zone 504 has an implied value T 0.Before the size of the target rank T that does not change this buffer zone 504, buffer zone 504 is that the target rank T of T0 carries out buffering work with the size.And the work that the optical disk system of using buffer zone 504 of the present invention also can be play normally.Yet above servo-drive system reads CD during by the part of scratch, the speed that data storing is advanced buffer zone 504 is lowered, this moment, the target rank T of buffer zone 504 will rise to T1 from implied value T 0, that is to say, the data volume D that is stored in the buffer zone 504 will improve, therefore, can lower the problem that optical disk system is play staccato.
Please refer to Fig. 7.Fig. 7 adjusts the synoptic diagram of the target rank reduction of other buffer zone 504 of target level for explanation is of the present invention.As shown in the figure, after the target rank T of buffer zone 504 is promoted to T1 (expression optical disk system reading at present on the CD by the part of scratch), buffer zone 504 is to be that the target rank T of T1 carries out buffering work with the size.And after servo-drive system has read on the CD by the part of scratch, just can continue to read normal part on the CD, at this time the data storing speed of advancing buffer zone 504 just can promote back original speed.That is to say that at this time the target rank T of buffer zone 504 does not need T1 so high, therefore, in order to save power supply, will descend the back size of implied value T 0 originally of the target rank T of buffer zone 504.And the work that the optical disk system of using buffer zone 504 of the present invention also can be play normally.Therefore, can lower the problem of optical disk system power saving.
And judge whether servo-drive system reads on the CD by the method for the part of scratch, the present invention proposes to read the mode of the system data on the CD, judges whether that the part that reads at present has by scratch.The system data that the present invention is alleged is the Q sign indicating number (Q-code) on the CD.When judgement is read less than the Q sign indicating number on the CD at present, represent that promptly the current servo system reads CD by the part of scratch, therefore improve the target rank of buffer zone.And when judging the Q sign indicating number that may be read at present on the CD, represent that promptly the current servo system reads the normal part of CD, therefore again the target rank that is enhanced is reduced to size originally.
Please refer to Fig. 8.Fig. 8 is the synoptic diagram of optical disk system 800 of the present invention.As shown in the figure, optical disk system 800 comprises a servo-drive system 102, a code translator 103, can adjust other buffer zone of target level (buffer) 804, a pick-up unit 807, a judging unit 107, one minute multiplexer 108, a decompressing device 109 and a digital analog converter (digital/analog converter, DAC) 105.Servo-drive system 102 is in order to read compression digital audio frequency signal stored on the CD 801.Code translator 103 is coupled to servo-drive system 102, in order to receive compressed digital audio and video signals and the decoding generation decoding digital audio that servo-drive system 102 is read.Buffer zone 804 is coupled to code translator 103 and servo-drive system 102, the decoding digital audio that is sent in order to storage decoder 102, and according to the big or small D of stored data volume and the relation between the target rank T, Control Servo System 102.For instance, when stored data volume D equals 804 data volumes that can store of buffer zone, then close servo-drive system 102 and make servo-drive system 102 stop to read the data on the CD 101.And, then start servo-drive system 102 when stored data volume during less than target rank T, make servo-drive system 102 begin to read the data on the CD 101.Pick-up unit 807 is coupled between code translator 103 and the buffer zone 804, the data that sent in order to receiver decoder 103, and judge whether system data wherein can get.If pick-up unit 807 is judged present system data for getting, then the target rank T with buffer zone 804 is made as T0 (default value).If pick-up unit judges that present system data is a non-availability, then the target rank T of buffer zone 804 is made as T1 (T1＞T0).Whether judging unit 107 is coupled to code translator 103, be compressed in order to judge the signal that code translator 103 is deciphered out, and transmit a control signal and give branch multiplexer 108.Dividing multiplexer 108 to comprise an input end I is coupled to buffer zone 804, an output terminal 01 and is coupled to that digital/analog converter 105, an output terminal 02 are coupled to decompressing device 109, a control end C is coupled to judging unit 107, in order to control signal, the data that are stored in buffer zone 804 are sent to decompressing device 109 or digital/analog converter 105 according to judging unit 107.Judge that when judging unit 107 digital audio and video signals of deciphering out is what not compress, then will divide the input end I of multiplexer 108 to be coupled to output terminal 01, therefore, the decoding digital audio of coming out from buffer zone 804 will directly enter digital/analog converter 105; When judging unit 107 judges that the digital audio and video signals of deciphering out is what to compress, then will divide the input end I of multiplexer 108 to be coupled to output terminal 02, therefore, the decoding digital audio of coming out from buffer zone 104 will enter decompressing device 109, after decompressing, just enter digital/analog converter 105.Digital/analog converter 105 is coupled to buffer zone 104 and decompressing device 109, and the decompression decoding digital audio that is transmitted in order to the decoding digital audio that will delay storage or decompressing device 109 is converted to simulated audio signal and exports to a loudspeaker 106.Loudspeaker 106 is converted to a voice signal with the simulated audio signal that is received again.Optical disk system 800 via loudspeaker 806, plays back compression digital audio frequency signal stored on the CD just in this way, has also solved power consumption and the problem of playing staccato simultaneously.
Please refer to Fig. 9.Fig. 9 is the method flow diagram of explanation with optical disk system broadcast of the present invention.Step is described as follows:
Step 901: beginning;
Step 902: servo-drive system 102 reads the data on the CD 101;
Step 903: the data decoding that code translator 103 is read servo-drive system 102;
Step 904: can adjust the decoding digital audio that other buffer zone 804 storage decoders 103 of target level send;
Step 905: it is a simulated audio signal that digital/analog converter 105 conversions are stored in the decoding digital audio that can adjust other buffer zone 804 of target level or decompressing device 109;
Step 906: the simulated audio signal that loudspeaker 106 sends digital/analog converter 105 converts sound to and plays;
Step 907: can adjust other buffer zone 104 of target level and start according to the size of stored data volume and other relation of target level or close servo-drive system 102;
Step 908: pick-up unit 807 can be adjusted the target rank of other buffer zone 804 of target level according to the system data control of being read;
Step 909: finish.
To sum up state, utilize optical disk system of the present invention and the target level method for distinguishing of adjusting buffer zone, the broadcast and the power saving of sound can be provided efficiently, and then improve user's convenience.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (9)
1. the method for a playing audio signal comprises:
When the stored data volume of a buffer zone is lower than a target rank, begin to read the digital audio and video signals on the CD;
This digital audio and video signals is deciphered to produce decoding digital audio;
This decoding digital audio is stored in this buffer zone;
When the stored data volume of this buffer zone equals data volume that this buffer zone can store, stop to read this optical disc data;
According to the system data of this decoding digital audio, set other size of this target level;
Convert the decoding digital audio that is stored in this buffer zone to a simulated audio signal;
Convert this simulated audio signal to a voice signal; And
Export this voice signal.
2. the method for claim 1 wherein according to the system data of this decoding digital audio, is adjusted other size of this target level, comprises:
When the system data of this decoding digital audio just often, setting this target rank is first default value;
When the system data of this decoding digital audio was unusual, setting this target rank was second default value;
Wherein this first default value is lower than this second default value.
3. the method for claim 1, this decoding digital audio that wherein will be stored in this buffer zone convert to this simulated audio signal comprise will be stored in this buffer zone this decoding digital audio with speed output and convert this simulated audio signal to; When the stored data volume of this buffer zone was lower than this target rank, the data that begin to read on this CD comprised when the stored data volume of this buffer zone is lower than this target rank, began to read this digital audio and video signals on this CD with the twice of this speed.
4. the method for claim 1, wherein when the stored data volume of this buffer zone is lower than this target rank, this digital audio and video signals that begins to read on this CD comprises when the stored data volume of this buffer zone is lower than this target rank, starts a servo-drive system to begin to read the digital audio and video signals on this CD.
5. method as claimed in claim 4, wherein when the stored data volume of this buffer zone equals data volume that this buffer zone can store, this digital audio and video signals that stops to read this CD comprises when the stored data volume of this buffer zone equals data volume that this buffer zone can store, stops this servo-drive system to stop to read this digital audio and video signals of this CD.
6. the method for claim 1, wherein this buffer zone is a dynamic RAM.
7. the method for claim 1 also comprises and judges that whether this decoding digital audio is through overcompression.
8. method as claimed in claim 7 also comprises if after this decoding digital audio of judgement, then will be stored in the decoding digital audio decompression earlier of this buffer zone through overcompression, convert a simulated audio signal again to.
9. a tool can be adjusted other disc-playing system of target level of buffer zone, comprises:
One servo-drive system comprises:
One control end is in order to receive a reading command or a halt instruction;
One reads end, in order to read the data on the CD; And
One first output terminal is in order to data on the disc that output is read;
Wherein after this servo-drive system received this reading command, this servo-drive system read the data on this CD;
Wherein after this servo-drive system received this halt instruction, this servo-drive system stopped to read the data on this CD;
One code translator is coupled to the output terminal of this servo-drive system, read data on the disc in order to receive this servo-drive system, and decoding produces a decoding data;
One pick-up unit is coupled to this code translator, promotes instruction in order to detect the system data in this decoding data and to produce one;
One judging unit is coupled to this code translator, in order to judge that decoding data that this code translator produces is whether through overcompression and produce a decision instruction;
One can adjust other buffer zone of target level, comprises:
One input end is coupled to this code translator, in order to receive this decoding data;
One first control end is coupled to the control end of this servo-drive system, in order to send this reading command or this halt instruction;
One second control end is coupled to this pick-up unit, in order to receive this lifting instruction; And
One output terminal is in order to export stored decoding data; And
Wherein when this can be adjusted other buffer zone of target level and receives this lifting instruction, promote the target rank that this can adjust other buffer zone of target level;
Wherein when this can be adjusted the stored decoding data of other buffer zone of target level and is lower than this target rank that can adjust other buffer zone of target level, this can be adjusted other buffer zone of target level and send this reading command;
Wherein when this can be adjusted the stored decoding data of other buffer zone of target level and equals this and can adjust the data volume that other buffer zone of target level can store, this can be adjusted other buffer zone of target level and send this halt instruction;
One decompressing device is in order to decompress to this decoding data;
One digital analog converter is in order to receive decoding data and to convert a sound signal to; And
One fen multiplexer comprises:
One input end is coupled to this and can adjusts other buffer zone of target level;
One first output terminal is coupled to this decompressing device;
One second output terminal is coupled to this digital analog converter; And
One control end is coupled to this judging unit, in order to receive this decision instruction;
Wherein this minute multiplexer first output terminal or second output terminal be coupled to this input end according to the decision instruction that this control end received.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005346838A (en) * | 2004-06-03 | 2005-12-15 | Matsushita Electric Ind Co Ltd | Information reproducing method |
| CN1841542A (en) * | 2005-03-07 | 2006-10-04 | 株式会社东芝 | Optical disc playback apparatus |
| CN1846252A (en) * | 2003-09-30 | 2006-10-11 | 索尼株式会社 | Data reproduction device and method, and program |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1846252A (en) * | 2003-09-30 | 2006-10-11 | 索尼株式会社 | Data reproduction device and method, and program |
| JP2005346838A (en) * | 2004-06-03 | 2005-12-15 | Matsushita Electric Ind Co Ltd | Information reproducing method |
| CN1841542A (en) * | 2005-03-07 | 2006-10-04 | 株式会社东芝 | Optical disc playback apparatus |
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