JP2005129188A - Optical disk player - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a change of a value of playback time information to be displayed at the time of the fast forwarding or the fast returning playback of an optical disk constant and also to make the timing of the change constant in an optical disk player. <P>SOLUTION: At the time of a fast forwarding playback, the time display means of this optical disk player displays playback time information by calculating spacing "Tdisp" of sectors whose time codes are utilized as playback time information based on the number of sectors "Sskip" whose reading are skipped and the number of sectors "Splay" which are reproduced and by moving sector positions in the reproducing direction of data by the spacing "Tdisp" of sectors on the basis of leading sector positions of reproduction sector groups F1, F2 whose video data and/or sound data are play backed just before carrying out skip operation every time video data and/or sound data are reproduced in sector unit and by acquiring time codes from management data of respective sector positions. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical disk reproducing apparatus for reproducing data stored on an optical disk such as a CD (compact disc) or a DVD (digital versatile disc).

  2. Description of the Related Art Conventionally, there has been known an optical disc playback apparatus that can perform fast forward playback or fast reverse playback of video data and / or audio data recorded on an optical disc at a predetermined multiple speed faster than a normal playback speed. In such an optical disk playback apparatus, fast forward playback or fast reverse playback is performed not by playing back video data and / or audio data for all sectors but by thinning out and playing back data at a certain rate. For example, when audio data recorded on a CD or the like is fast-forwarded and reproduced at 15 times speed, as shown in FIG. 5A, after reproducing audio data for 30 sectors, the data reproduction direction (for 420 sectors) ( Audio data is skipped in the direction of arrow a). By repeating these reproduction and skipping operations, a part of the audio data is reproduced intermittently in the order of f1, f2, f3, f4. On the other hand, when fast reverse playback is performed at 15 times speed, as shown in FIG. 5B, after the audio data for 30 sectors is reproduced, the data is reproduced in the direction opposite to the data reproduction direction by 480 sectors (in the direction of arrow b). The voice data is skipped and the playback and skipping operations are repeated to intermittently reproduce a part of the voice data in the order of r1, r2, r3, r4.

  However, in such a conventional optical disk playback device, during fast forward playback or fast reverse playback, playback time information is displayed using the time code of the sector in which video data and / or audio data is actually played back. For this reason, the display value of the playback time changed greatly instantaneously, which was unnatural. In addition, when the user searches for the target playback position while referring to the display of the playback time, it is difficult to stop at the target position.

On the other hand, reproduction time information is generated in advance from the address information recorded on the optical disc and the count value of the reproduction synchronization signal, input to the register, and output from the register every unit time. 2. Description of the Related Art An optical disc reproducing apparatus that can easily generate and display a reproduction time is known (see, for example, Patent Document 1). Also, there is known an optical disk reproducing apparatus capable of fast-forwarding reproduction of a desired picture using address information of MPEG data reproduced by an optical pickup and a start position of each picture included in MPEG data after error correction. (For example, refer to Patent Document 2). Also, the number of sectors per unit time of audio data to be reproduced is calculated from the management data of DVD audio, and the number of playback sectors and the number of jump sectors for fast forward playback and fast reverse playback are calculated based on the calculated values. An apparatus that can be applied to fast forward playback and fast reverse playback of audio data having different audio attributes such as the transfer bit rate is known (see, for example, Patent Document 3).
Japanese Patent Laid-Open No. 7-21745 JP 2001-111405 A JP 2002-8318 A

  However, in the optical disc playback apparatus described in Patent Document 1, since the time code recorded on the optical disc is not used, the processing becomes more complicated than when playback time information is displayed using the time code. In addition, the optical disk reproducing apparatus described in Patent Document 2 can reduce the processing amount when performing special reproduction such as fast-forward reproduction and can improve the data access speed during special reproduction, but fast-forward reproduction or fast-reverse. It does not improve the display of playback time information during playback. The optical disk playback device described in Patent Document 3 can be applied to fast forward playback and fast reverse playback of audio data having different audio attributes such as two or more types of transfer bit rates, but at the time of fast forward playback or fast reverse playback. It does not improve the display of playback time information.

  The present invention has been made in order to solve the above-described problem. The value of the playback time information displayed at the time of fast-forward playback or fast-rewind playback of the optical disc and the timing of the change are constant, and the user can play back the playback time. When searching for a target playback position while referring to the above, it is an object to provide an optical disk playback apparatus that can be easily stopped at the target position.

  In order to achieve the above object, the invention of claim 1 is a data reading means for reading video data and / or audio data recorded on an optical disc and management data corresponding to the video data and / or audio data in units of sectors. Storage means for temporarily storing video data and / or audio data and management data read by the data reading means, and decoding the video data and / or audio data stored by the storage means Based on reproduction means for outputting as a video signal and / or audio signal, reproduction control means for controlling the reproduction means based on the management data stored in the storage means, and the management data stored in the storage means In an optical disk playback device comprising time display means for acquiring time code and displaying playback time information The reproduction means controls a sector position for reproducing the video data and / or audio data stored by the storage means based on a control signal from the reproduction control means. After reproducing the video data and / or audio data of the reproduction sector group consisting of, the video data and / or audio data is read in the data reproduction direction by a predetermined number of sectors set separately from the number of sectors of the reproduction sector group. By skipping and repeating these playback and reading skipping operations, only the playback sector group is played back intermittently, and during fast reverse playback, video data and / or audio data of a playback sector group consisting of a predetermined number of sectors is played back. After that, the reproduction direction of the data is set by the predetermined number of sectors set separately from the number of sectors of the reproduction sector group. The video data and / or audio data is skipped in the direction, and only the playback sector group is intermittently played by repeating these playback and skipping operations. The time display means skips the reading skip during fast forward playback. By adding the number of sectors to be reproduced to the number of sectors to be reproduced, and dividing this added value by the number of sectors to be reproduced, the interval of sectors in which the time code is used as the reproduction time information is calculated. Each time video data and / or audio data is reproduced in the above, in the data reproduction direction with reference to the last sector position of the reproduction sector group where the video data and / or audio data is reproduced immediately before the skipping operation is performed. The sector position is moved by the sector interval calculated above, and the time code is extracted from the management data at each sector position. To display the playback time information, in the case of fast reverse playback, by subtracting the number of sectors to be reproduced from the number of sectors skipped, and dividing this subtraction value by the number of sectors to be reproduced, Every time the video data and / or audio data is reproduced in units of sectors, the video data and / or audio data is reproduced immediately before the skipping operation by calculating the sector interval in which the time code is used as the reproduction time information. The time is obtained from the management data of each sector position by moving the sector position by the calculated sector interval in the direction opposite to the data reproduction direction with reference to the head sector position of the reproduced sector group. Thus, the reproduction time information is displayed.

  According to a second aspect of the present invention, there is provided a data reading unit that reads out video data and / or audio data recorded on an optical disc and management data corresponding to the video data and / or audio data in units of sectors, and the data reading unit. Storage means for temporarily storing the read video data and / or audio data and management data; and decoding the video data and / or audio data stored by the storage means to generate a video signal and / or audio signal Based on the management data stored in the storage means, a playback control means for controlling the playback means, and a time code obtained from the management data stored in the storage means for playback In an optical disk reproducing apparatus comprising time display means for displaying time information, the reproduction means Based on the control signal from the control means, the sector position for reproducing the video data and / or audio data stored in the storage means is controlled, and during fast forward reproduction, the video of the reproduction sector group consisting of a predetermined number of sectors After data and / or audio data is reproduced, video data and / or audio data is skipped in the data reproduction direction by a predetermined number of sectors set separately from the number of sectors in the reproduction sector group, and these reproduction and reading are skipped. By repeating the operation, only the playback sector group is played back intermittently, and the time display means, during fast forward playback, the playback time information based on the number of sectors skipped and the number of sectors played back. Calculate the interval of sectors where time code is used as video data and / or audio data for a predetermined number of sectors Each time the data is reproduced, the sector position is moved in the data reproduction direction by the sector interval calculated as described above, the time code is acquired from the management data at each sector position, and the reproduction time information is displayed. And

  According to a third aspect of the present invention, there is provided a data reading unit for reading video data and / or audio data recorded on an optical disc and management data corresponding to the video data and / or audio data in units of sectors, and the data reading unit. Storage means for temporarily storing the read video data and / or audio data and management data; and decoding the video data and / or audio data stored by the storage means to generate a video signal and / or audio signal Based on the management data stored in the storage means, a playback control means for controlling the playback means, and a time code obtained from the management data stored in the storage means for playback In an optical disk reproducing apparatus comprising time display means for displaying time information, the reproduction means Based on a control signal from the control means, the position of the sector for reproducing the video data and / or audio data stored in the storage means is controlled, and in the case of fast reverse reproduction, a reproduction sector group consisting of a predetermined number of sectors is controlled. After reproducing the video data and / or audio data, the video data and / or audio data is skipped in the direction opposite to the data reproduction direction by a predetermined number of sectors set separately from the number of sectors in the reproduction sector group. Only the playback sector group is played back intermittently by repeating playback and skipping operations, and the time display means is based on the number of sectors skipped and the number of sectors played back during fast reverse playback. Calculating a sector interval in which a time code is used as the playback time information to obtain a predetermined number of video data and / or sound. Each time data is reproduced, the sector position is moved in the opposite direction to the data reproduction direction by the calculated sector interval, and the time code is obtained from the management data of each sector position to obtain the reproduction time information. It is characterized by displaying.

  As described above, according to the first aspect of the present invention, at the time of fast-forward playback or fast-rewind playback, every time video data and / or audio data is played back on a sector basis, the sector is determined at a fixed sector interval obtained by calculation. Since the playback time information is displayed by moving the position and acquiring the time code from the management data of each sector position, the change in the value of the displayed playback time information is constant and the change timing is constant. The user can easily read the reproduction time information. For this reason, when the user searches for the target reproduction position while referring to the reproduction time information, it is easy to stop at the target position.

  According to the second aspect of the present invention, the change in the value of the reproduction time information displayed at the time of fast-forward reproduction is constant and the change timing is constant, so that the user can easily read the reproduction time information.

  According to the invention of claim 3, since the change of the value of the reproduction time information displayed at the time of fast reverse reproduction is constant and the change timing is constant, the user can easily read the reproduction time information.

  An optical disk reproducing apparatus according to an embodiment of the present invention will be described with reference to FIG. 1 by taking a CD player as an example. The CD player 1 is a device for reproducing audio data recorded on the CD 2, and includes a drive control unit 20, a spindle motor 21, an optical pickup 22, a signal processing unit 30, a system control unit 40, and a buffer. A memory 50, a decoder unit 60, a display unit 70, and a remote control receiving unit 80 are provided. Audio data and sub-coding (management data) corresponding to the audio data are recorded on the CD 2 in units of sectors, and a time code is stored in the Q channel of the sub-coding. The reproduction time per sector is about 0.013 seconds, and 75 sectors is about 1 second.

  The drive control unit 20 is for controlling the spindle motor 21 and the optical pickup (data reading means) 22, and controls the rotational speed of the spindle motor 21, the position control of the optical pickup 22, tracking servo control, and focus servo. Control and so on. The optical pickup 22 includes a semiconductor laser (not shown), an optical system, a photodetector, and the like, and reads data recorded on the CD 2 by irradiating the CD 2 with a laser beam.

  The signal processing unit 30 demodulates the signal input from the optical pickup 22 during CD2 reproduction to obtain a reproduction signal corresponding to the data recorded on the CD2. In addition, the signal processing unit 30 generates a focusing error signal and a tracking error signal and outputs them to the system control unit 40.

  The system control unit (reproduction control means) 40 includes a ROM that records a control program, a CPU that performs arithmetic processing according to the control program, and a RAM that temporarily stores the control program and data. The system control unit 40 controls the entire CD player 1 according to a user instruction input to the remote control receiving unit 80 via the remote controller 81, and controls a playback operation, a fast forward playback operation, a fast reverse playback operation, and the like.

  The buffer memory (storage means) 50 stores data read from the CD 2 by the optical pickup 22 and demodulated by the signal processing unit 30 in units of sectors. The decoder unit (reproducing means) 60 performs predetermined processing on the audio data input from the buffer memory 50 to convert it into an audio signal, and obtains a time code from the sub-coding Q channel. The audio signal is output as audio from a speaker (not shown), and the time code is output to the system control unit 40 together with other sub-coding. The display unit (time display means) 70 displays the reproduction time information based on the time code acquired by the decoder unit 60.

  First, a procedure for displaying the reproduction time information on the display unit 70 will be described with reference to FIG. During fast forward playback or fast reverse playback, the system control unit 40 determines whether or not the sector in which the audio data is being played has been switched (S1). When the reproduction sector is switched (YES in S1), the sector position where the time code is used as the reproduction time information is calculated by the calculation method described later (S2), the time code is acquired from the sector at that position, and the display unit The display of the reproduction time information of 70 is switched (S3).

  Next, a method for calculating a sector position where a time code is used as playback time information during fast forward playback or fast reverse playback will be described. First, the case of fast-forward playback will be described with reference to FIG. In FIG. 3A, when a fast-forward playback operation is performed at the position of sector 04, a predetermined number of sectors are skipped, the playback sector group F1 is played back, and further, a predetermined number of sectors are skipped and playback sector group F2 is skipped. Play. The CD player 1 reproduces the audio data of the reproduction sector groups F1, F2,... As shown in FIG. 3B by alternately repeating the reproduction operation and the skipping operation in this way. At this time, since the skipping operation is performed in an instant, sound is continuously output from the speaker. On the other hand, the playback time information is displayed using the time code of the sector in which the audio data is played back because the sector is skipped between the sector 04 and the sector 13 and between the sector 16 and the sector 25. Then, after the playback time continuously changes, the value suddenly changes greatly and becomes unnatural. This makes it difficult for the user to find the target playback position. In the CD player 1 of this embodiment, during fast forward playback or fast reverse playback, which will be described later, the playback time information is not displayed using the time code of the sector in which the audio data is actually played back. Each time the video data / audio data is reproduced, the sector position is moved by a certain sector interval obtained by the calculation, the time code is acquired from the management data of each sector position, and the time information is displayed.

  As shown in FIG. 3A, when the number of sectors skipped “Sskip” is “8” and the number of sectors to be reproduced “Spray” is “4”, the number of sectors skipped. By adding “4” to the number of sectors to be reproduced “8” and dividing this added value “12” by the number of sectors to be reproduced “4”, the interval of sectors in which the time code is used as reproduction time information A value “3” of “Tdisp” is obtained. Then, the obtained sector interval “Tdisp” is substituted into the equation shown in FIG. 3D to calculate the sector position. A time code is read from this sector position, and reproduction time information is displayed using the time code.

  In the expression shown in FIG. 3D, “the last sector position of the reproduction sector group immediately before skipping” is sector 04, sector 13 or sector 25 in FIG. The “sector position in the reproduction sector group” is, for example, “1” for the sector 13 reproduced first in the reproduction sector group F1, “2” for the sector 14 reproduced second, and so on. Is “3” and sector 16 is “4”. When the audio data of the sector 13 is reproduced, the sector interval “Tdisp” value “3” is set to “1” with reference to the sector 04 that is “the last sector position of the reproduction sector group immediately before skipping”. The multiplied value is added to sector position “4” of sector 04 to obtain sector position “7”. Then, during reproduction of the audio data in sector 13, reproduction time information is displayed based on the time code in sector 07. Therefore, when the audio data of the sector shown in FIG. 3 (b) is being reproduced, the reproduction time information displayed is displayed based on the time code of the sector shown in FIG. 3 (c). .

  Next, the case of fast reverse playback will be described with reference to FIG. In FIG. 4A, when the fast reverse playback operation is performed at the position of the sector 25, the CD player 1 skips the predetermined number of sectors, plays the playback sector group R1, and further reads the predetermined number of sectors. The playback sector group R2 is reproduced by skipping. The CD player 1 reproduces the audio data of the reproduction sector groups R1, R2,... As shown in FIG. 4B by alternately repeating the reproduction operation and the skipping operation in this way.

  As shown in FIG. 4A, when the number of sectors skipped “Sskip” is “16” and the number of sectors to be reproduced “Spray” is “4”, the number of sectors skipped. By subtracting the number of sectors to be reproduced “4” from “16” and dividing the subtracted value “12” by the number of sectors to be reproduced “4”, the interval of sectors in which the time code is used as reproduction time information A value “3” of “Tdisp” is obtained. Then, the obtained sector interval “Tdisp” is substituted into the equation shown in FIG. 4D to calculate the sector position. A time code is read from this sector position, and reproduction time information is displayed using the time code.

  In the formula shown in FIG. 4D, the “first sector position of the reproduction sector group immediately before skipping” is sector 25, sector 13 or sector 1 in FIG. The “sector position in the reproduction sector group” is, for example, “1” for the sector 13 reproduced first in the reproduction sector group R1, “2” for the sector 14 reproduced second, and so on. Is “3” and sector 16 is “4”. When the audio data of the sector 13 is reproduced, the sector interval “Tdisp” value “3” is set to “1” with reference to the sector 25 which is “the first sector position of the reproduction sector group immediately before skipping”. The multiplied value is subtracted from sector position “25” of sector 25 to obtain sector position “22”. Then, during reproduction of the audio data in sector 13, reproduction time information is displayed based on the time code in sector 22. Therefore, when the audio data of the sector shown in FIG. 4 (b) is being reproduced, the reproduction time information displayed is displayed based on the time code of the sector shown in FIG. 4 (c). .

  As described above, according to the CD player 1 of the present embodiment, at the time of fast-forward playback or fast-rewind playback, each time the audio data is played back on a sector basis, the sector position is moved by a certain sector interval obtained by calculation. Since the time code is acquired from the management data at each sector position and the playback time information is displayed, the change in the value of the displayed playback time information is constant and the change timing is constant. Playback time information can be read easily. For this reason, when the user searches for the target reproduction position while referring to the reproduction time information, it is easy to stop at the target position.

  The present invention is not limited to the configuration of the above embodiment, and various modifications can be made. For example, in the above-described embodiment, the CD has been described. However, the optical disk is not limited to the CD, and may be another optical disk such as a DVD (digital versatile disc). Further, the data recorded on the optical disc is not limited to audio data, and may be video data. In addition, the number of sectors to be reproduced “Sskip”, the number of sectors to be skipped “Spray”, and the sector interval “Tdisp” in which the time code is used as reproduction time information at the time of fast forward playback or fast reverse playback Not limited to this, the time code is acquired at a constant sector interval in accordance with the double speed of fast forward playback or fast reverse playback, and the change of the value of the playback time information displayed on the display unit 70 is constant, and the change timing Should be constant.

The block diagram which shows the structure of CD player by one Embodiment of this invention. The flowchart explaining the time display calculation process at the time of the fast forward reproduction | regeneration of the same apparatus, or a fast reverse reproduction | regeneration. Explanatory drawing of fast-forward reproduction | regeneration operation | movement of the apparatus. Explanatory drawing of the fast reverse reproduction | regeneration operation | movement of the apparatus. Explanatory drawing of fast-forward reproduction | regeneration or fast-rewind reproduction | regeneration in the conventional optical disk reproduction | regeneration apparatus.

Explanation of symbols

1 CD player (optical disk playback device)
2 CD (optical disc)
22 Optical pickup (data reading means)
40 System control unit (reproduction control means)
50 Buffer memory (storage means)
60 Decoder unit (reproduction means)
70 Display (Time display means)
F1, F2, R1, R2 Playback sector group

Claims (3)

Data reading means for reading video data and / or audio data recorded on the optical disc and management data corresponding to the video data and / or audio data in units of sectors;
Storage means for temporarily storing video data and / or audio data and management data read by the data reading means;
Reproduction means for decoding the video data and / or audio data stored by the storage means and outputting the decoded data as a video signal and / or audio signal;
Reproduction control means for controlling the reproduction means based on the management data stored by the storage means;
In an optical disc reproducing apparatus comprising time display means for obtaining a time code from the management data stored by the storage means and displaying reproduction time information,
The reproducing means includes
Based on a control signal from the reproduction control means, the sector position for reproducing the video data and / or audio data stored by the storage means is controlled,
For fast-forward playback, after reproducing video data and / or audio data of a playback sector group consisting of a predetermined number of sectors, the playback direction of the data is the same as the number of sectors set separately from the number of sectors of the playback sector group. The video data and / or audio data is skipped, and only the playback sector group is intermittently played by repeating these playback and skipping operations.
During fast reverse playback, after playing back video data and / or audio data of a playback sector group consisting of a predetermined number of sectors, playback of data is performed for a predetermined number of sectors set separately from the number of sectors in the playback sector group. The video data and / or audio data is skipped in the direction opposite to the direction, and only the playback sector group is intermittently played by repeating these playback and skipping operations.
The time display means is
At the time of fast-forward playback, the number of sectors to be reproduced is added to the number of sectors to be skipped, and the added value is divided by the number of sectors to be reproduced, whereby a time code is used as the reproduction time information. Every time the video data and / or audio data is reproduced in units of sectors by calculating the sector interval, the last sector position of the reproduction sector group in which the video data and / or audio data was reproduced immediately before the skip operation With reference to the data, in the data reproduction direction, the sector position is moved by the sector interval calculated above, and the time code is acquired from the management data at each sector position to display the reproduction time information,
At the time of fast reverse playback, a time code is used as the playback time information by subtracting the number of sectors to be reproduced from the number of sectors skipped and dividing the subtracted value by the number of sectors to be reproduced. Each time the video data and / or audio data is reproduced in units of sectors, the first sector of the reproduction sector group in which the video data and / or audio data is reproduced immediately before the skipping operation is calculated. Using the position as a reference, move the sector position by the sector interval calculated above in the direction opposite to the data reproduction direction, obtain the time code from the management data of each sector position, and display the reproduction time information An optical disc device characterized. Data reading means for reading video data and / or audio data recorded on the optical disc and management data corresponding to the video data and / or audio data in units of sectors;
Storage means for temporarily storing video data and / or audio data and management data read by the data reading means;
Reproduction means for decoding the video data and / or audio data stored by the storage means and outputting the decoded data as a video signal and / or audio signal;
Reproduction control means for controlling the reproduction means based on the management data stored by the storage means;
In an optical disc reproducing apparatus comprising time display means for obtaining a time code from the management data stored by the storage means and displaying reproduction time information,
The reproducing means includes
Based on a control signal from the reproduction control means, the sector position for reproducing the video data and / or audio data stored by the storage means is controlled,
For fast-forward playback, after reproducing video data and / or audio data of a playback sector group consisting of a predetermined number of sectors, the playback direction of the data is the same as the number of sectors set separately from the number of sectors of the playback sector group. The video data and / or audio data is skipped, and only the playback sector group is intermittently played by repeating these playback and skipping operations.
The time display means is
During fast-forward playback, based on the number of sectors to be skipped and the number of sectors to be played back, a sector interval in which a time code is used as the playback time information is calculated, and a predetermined number of sectors of video data and / or Each time the audio data is reproduced, the sector position is moved in the data reproduction direction by the calculated sector interval, the time code is acquired from the management data of each sector position, and the reproduction time information is displayed. An optical disc device characterized by the above. Data reading means for reading video data and / or audio data recorded on the optical disc and management data corresponding to the video data and / or audio data in units of sectors;
Storage means for temporarily storing video data and / or audio data and management data read by the data reading means;
Reproduction means for decoding the video data and / or audio data stored by the storage means and outputting the decoded data as a video signal and / or audio signal;
Reproduction control means for controlling the reproduction means based on the management data stored by the storage means;
In an optical disc reproducing apparatus comprising time display means for obtaining a time code from the management data stored by the storage means and displaying reproduction time information,
The reproducing means includes
Based on a control signal from the reproduction control means, the sector position for reproducing the video data and / or audio data stored by the storage means is controlled,
During fast reverse playback, after playing back video data and / or audio data of a playback sector group consisting of a predetermined number of sectors, playback of data is performed for a predetermined number of sectors set separately from the number of sectors in the playback sector group. The video data and / or audio data is skipped in the direction opposite to the direction, and only the playback sector group is intermittently played by repeating these playback and skipping operations.
The time display means is
At the time of fast reverse reproduction, based on the number of sectors to be skipped and the number of sectors to be reproduced, a sector interval in which a time code is used as the reproduction time information is calculated, and a predetermined number of sectors of video data and / or Alternatively, every time audio data is reproduced, the sector position is moved by the interval of the sector calculated as described above in the direction opposite to the data reproduction direction, and the time code is acquired from the management data at each sector position to reproduce the reproduction time. An optical disc apparatus characterized by displaying information.

Images