JP4348524B2 - Disc playback method, disc playback apparatus, and disc playback system - Google Patents

Description

The present invention may access for each channel in the disk media content data such as music data and video data are recorded, a method for reproducing content data of each channel from the disk medium and equipment, your and disk reproducing device The present invention relates to a disc playback system.

  Random access and multi-access are possible for optical discs such as CD (Compact Disc) and DVD (Digital Versatile Disc), magneto-optical discs such as Mini-Disc (registered trademark), and disc media such as magnetic discs.

  In Patent Document 1 (Japanese Patent Laid-Open No. 10-293990), multi-access is recorded and reproduced simultaneously on different areas of a disk medium. It is shown that the process of reading data is performed simultaneously.

  Patent Document 2 (Japanese Patent Application Laid-Open No. 2000-278647) discloses a portion corresponding to a requested reproduction speed when an image reproduction request is made in a multi-channel AV (Audio Visual) server having a plurality of hard disks. The image data is read out, stored in the buffer memory, read out from the buffer memory, and the reconstructed image is constructed, so that when the replay speed change is requested, the request is immediately responded. .

  However, this is not the multi-access that performs recording and playback at the same time or multi-channel using multiple hard disks, but multiple users can simultaneously access a single disk medium containing a large number of songs and video titles. Therefore, it is possible to play and listen to the songs and video titles that you want.

  Specifically, in this case, when the users U1, U2, U3 try to listen to the songs M1, M2, M3, respectively, and access one disc medium at the same time, the disc playback apparatus, as shown in FIG. First, the read head 4 is moved to the head position of the music piece M1 on the disk medium 2, and the data of the first part M1a of the music piece M1 is read and written in the buffer memory 451 of the channel.

  Next, as indicated by the arrow S12, the reading head 4 is moved to the head position of the music piece M2, the data of the first portion M2a of the music piece M2 is read and written to the buffer memory 452 of the channel, and then the arrow S23. As shown in FIG. 4, the reading head 4 is moved to the head position of the music M3, the data of the first part M3a of the music M3 is read, and written in the buffer memory 453 of the channel. Next, returning to the tune M1, the read head 4 is moved to the next portion M1b of the tune M1, and the data in the portion M1b is read and written into the buffer memory 451. The same applies thereafter.

  As shown in FIG. 11 ("ch" in the figure is a channel, and "seek" is the movement of the read head 4 in the disk radial direction), the data stored in the buffer memories 451, 452, and 453 are respectively buffered. Data are read from the buffer memories 451, 452, 453 at a rate lower than the transfer rate to the memories 451, 452, 453, and decoded by the decoders 471, 472, 473. Thus, the music pieces M1, M2, and M3 can be continuously reproduced as the outputs PB1, PB2, and PB3 of the respective channels.

The prior art documents listed above are as follows.
JP-A-10-293990 JP 2000-278647 A

  However, in multi-channel playback by multi-access as described above, it takes time until playback output is obtained at the start of access.

  Specifically, in the example of FIGS. 10 and 11, when the access commands by the access operations of the users U1, U2, and U3 are received almost simultaneously at the time points t1, t2, and t3, the reproduction output of the last song M3 is performed. Before PB3 is obtained, from time t3, the time for the reading head 4 to move to the beginning position of the song M1, the time for reading the data of the first part M1a of the song M1, the time to move from there to the beginning position of the song M2, It takes time to read the data of the first part M2a of the music M2, the time to move to the head position of the music M3, and the time to read the data of the first part M3a of the music M3. If the number of access channels is larger, it takes longer time.

  For this reason, when the user accesses the disk medium 2 by an access operation, the user may mistakenly recognize that the playback system has malfunctioned or has failed.

In view of this, the present invention prevents the user from making such a misconception during an access operation and allows the user to know the time until the content reproduction output is obtained .

The disc playback method of the present invention comprises:
A disk playback method executed by a controller of a disk playback device that accesses a disk medium in which content data is recorded for each channel and plays back the content data of each channel from the disk medium,
When receiving an access command to the disk medium, a first step of determining whether or not there is a priority access command for the access command;
When it is determined in the first step that a priority access command exists, the time required to move the read head to the target position on the disk medium for each priority access command and the access command. And a second step of calculating a time for reading the content data from the disk medium for each of the access commands at least in order of precedence, and calculating a sum of the calculated times as a delay time for the access command. When,
The delay time calculated in the second step is used as the time required to start the reproduction of the content data specified by the access command, and the reproduction of the image data or audio data recorded in advance in the disc reproduction apparatus is performed. A third step of presenting to the user of the channel of the access command by:
Is provided.

In the disc playback method of the present invention described above, when there is a prior access at the time of the user's access operation and it takes time until the content playback output is obtained, the time is presented to the user by image or sound. Is done .

Therefore, the user knows the time until the content reproduction output is obtained, and does not mistake the reproduction system for malfunction or failure .

As described above, according to the present invention, the user can recognize that the playback system malfunctions or breaks down during an access operation, and knows the time until the content playback output is obtained .

[Embodiments of Disc Playback Device and Disc Playback System: FIGS. 1 to 3]
(An example of a disk playback device: FIG. 1)
FIG. 1 shows an example of a disc playback apparatus according to the present invention, which can play back multi-access multi-channel playback of content data such as music data and video data recorded on an optical disc such as a CD or DVD. Is.

  In the mechanical deck unit 30, the optical disk 1 loaded on the disk reproducing device 10 is rotationally driven by a spindle motor 31. The optical head (optical pickup) 33 is attached to the thread 35 and is moved in the radial direction of the optical disc 1 along the thread shaft 37 by the thread motor 36.

  The read output of the optical head 33 is supplied to the RF amplifier 41, and a focus error signal, a tracking error signal, and recording data are obtained from the RF amplifier 41.

  The focus error signal and tracking error signal are supplied to the servo controller 39, and focusing and tracking of the optical head 33 are controlled by the focus servo control signal and tracking servo control signal from the servo controller 39.

  The recorded data is demodulated and error-corrected by the demodulation error correction circuit 42. As the record data, address information recorded on the optical disc 1, content index information such as TOC (Table Of Contents), and content data such as music data and video data are obtained.

  The address information and the content index information are taken into the system controller 51 and used for accessing the optical disc 1 by the drive control of the spindle motor 31 and the sled motor 36 by the servo controller 39.

  The content data from the demodulation error correction circuit 42 is divided by the channel dividing circuit 43 into the number of access channels to the optical disc 1 at that time within a maximum of n channels.

  The divided content data of each channel is stored in the buffer memories 451, 452, 453... 45n, read out from the buffer memories 451, 452, 453... 45n, and decoded by the decoders 471, 472, 473. As a result, reproduction outputs PB1, PB2, PB3... PBn of maximum n channels are obtained.

  45n are prepared in advance as buffer memories 451, 452, 453... 45n, or buffer memories corresponding to the number of access channels at that time are set on a memory such as a DRAM (Dynamic RAM).

  The system controller 51 is configured by a computer, and includes a CPU and a RAM in which programs and data are expanded. The system controller 51 is connected to a storage unit 59 such as a ROM, an operation unit 55 and a display unit 57.

  The storage unit 59 stores various programs including a time calculation processing routine, which will be described later, and contents to be played back during the user access operation until data specified by the access command is started as described later. Various data including information data is stored in advance.

  In this example, the operation unit 55 performs an access operation for each channel and other operations, and commands CM1, CM2, CM3... CMn corresponding to the operation of each channel are given from the operation unit 55 to the system controller 51. The system controller 51 executes access to the optical disc 1 in accordance with the commands CM1, CM2, CM3.

  The display unit 57 is configured by a liquid crystal display or the like, and the system controller 51 displays the operation status and operation state of the disc playback apparatus 10.

  When the content information data stored in the storage unit 59 is image data, the image data is read from the storage unit 59 by the system controller 51, and is decompressed in the case of compressed data. An image is displayed on 57, or the image data is supplied to the output switching unit 49 together with the switching control signal.

  When the content information data stored in the storage unit 59 is audio data, the audio data is read from the storage unit 59 by the system controller 51 and decompressed in the case of compressed data, along with a switching control signal. This is supplied to the output switching unit 49.

  The output switching unit 49 outputs the image data or the audio data as the content information data until the reproduction of the content data of the channel is started as the data output of each channel in the future, and the content data of the channel Is started by the above switching control signal so that the reproduction outputs PB1, PB2, PB3,... PBn from the decoders 471, 472, 473,.

(Example of disc playback system: Fig. 2)
FIG. 2 shows an example of a disc playback system according to the present invention. As an in-vehicle music playback system, a disc playback device 10 as in the example of FIG. 1 and audio output devices 101 and 102 for each channel (for each user). , 103... 10n.

  In this case, a large number of song data is recorded on the optical disc 1, and the disc reproducing apparatus 10 reproduces the song data, and the reproduction outputs PB1, PB2, PB3. , 102, 103... 10n. The disc player 10 is installed in the front part of the front seat of the car.

  The audio output device 101 is for a user who listens to music in the front seat of the car, converts the reproduction output PB1 into left and right analog audio signals, and supplies them to the left and right speakers 113L and 113R. The speakers 113L and 113R are provided at the left and right positions of the front seat, for example.

  The audio output devices 102, 103... 10n are for users who listen to music at the rear seats of the car, respectively, and the reproduction outputs PB2, PB3... PBn are converted into left and right analog audio signals, and left and right audio output terminals 117L. , 117R. Therefore, each user can listen to the music of the reproduction outputs PB2, PB3,... PBn by connecting the headphones 118 to the audio output terminals 117L and 117R.

  In this example, each user in the vehicle designates a desired song to the system controller 51 of the disc playback device 10 by, for example, an access operation on the operation unit 55 by a passenger in the passenger seat, and plays the song. (Cue playback, normal playback, fast forward playback, fast reverse playback, etc.) can be instructed.

  As described above, the audio data Da read from the storage unit 59 as the content information data is transmitted to the audio output devices 101, 102, 103,..., 10n in the same manner as the reproduction outputs PB1, PB2, PB3,. At this time, the following sound is output from the speakers 113L and 113R or the headphones 118.

  In addition, the decoders 471, 472, 473... 47n shown in FIG. 1 are provided on the audio output devices 101, 102, 103... 10n side, and the audio data as the content information data is also the audio output devices 101, 102, 103. You may comprise so that it may decode on the side.

(Another example of the disc playback system: Fig. 3)
FIG. 3 shows another example of the disk reproduction system of the present invention. As a video / audio reproduction system used in a house or the like, the disk reproduction apparatus 10 as in the example of FIG. 1 and each channel (for each user) are shown. This is a case where the video / audio output devices 201, 202, 203.

  In this case, video / audio data such as each scene of a movie and each story part of the first episode and the second episode of the continuous drama is recorded on the optical disc 1, and the disc playback apparatus 10 reproduces the video / audio data. Then, the reproduction outputs PB1, PB2, PB3... PBn are transmitted from the antenna 63 to the video / audio output devices 201, 202, 203.

  The video / audio output devices 201, 202, 203,... 20n are installed in each user's room or the like, or possessed by each user, and transmitted from the disc playback device 10 by the antenna 211 and the transmission / reception unit 212. The playback output of the channel is received.

  The received reproduction output is separated into video data and audio data by the video / audio separation circuit 213, and the separated video data is converted into an analog video signal by the video processing circuit 214. The signal is converted into an analog audio signal by the processing circuit 215, an image is displayed on the display 216, and audio is output from the speaker 217.

  Further, in this example, an access operation for each channel (each user) and other operations are performed by the operation unit 219 of the video / audio output devices 201, 202, 203. A command by the operation is sent from the controller 218 to the transmission / reception unit 212, and is transmitted to the disc playback apparatus 10 by the transmission / reception unit 212. In the disc reproducing apparatus 10, the transmitted command is received by the transmission / reception unit 61 and taken into the system controller 51.

  As described above, the content information data Dva read from the storage unit 59 is transmitted to the video / audio output devices 201, 202, 203... 20n, and the content information data Dva, as with the reproduction outputs PB1, PB2, PB3. Is an image data, the following image is displayed on the display 216 during an access operation. When the content information data Dva is audio data, the speaker 217 performs the following operation from the speaker 217 during an access operation. Audio is output.

  .., 47n shown in FIG. 1 are provided on the video / audio output devices 201, 202, 203... 20n side, and image data or audio data as content information data is also included in the video / audio output devices 201, 202, 203... 20n may be decoded.

[ Calculation and presentation of content playback start time : FIGS. 4 to 9]
When performing multi-channel playback by multi-access in the above-described disk playback system of each example, as described above with reference to FIGS. 10 and 11, playback is actually started and content playback output is obtained during an access operation. It takes time.

  Therefore, in the above-described disk playback system of each example, during the access operation, until the playback of the content data is started, the image or audio is played as follows using the content information data stored in the storage unit 59. To do.

Specifically, in the disc playback apparatus 10, the time required from when the system controller 51 receives the access command to the start of playback of the content data specified by the access command is predicted and presented to the user . . Hereinafter , this time is referred to as “delay time”.

  As shown in FIG. 4, a FIFO (First In First Out) access queue 53 is set on the RAM in the system controller 51. When the system controller 51 (CPU) receives an access command, the command is sent to the FIFO. Write to the access queue 53.

  The example of FIG. 4 is a case where the access commands cm1, cm4, cm5, cm3, and cm2 of the channels 1, 4, 5, 3, and 2 are sequentially received in this order, and the command cm1 cm4 and cm5 indicate the reproduction of the track 5, the command cm3 indicates the reproduction of the track 10, and the command cm2 indicates the reproduction of the track 7, respectively.

  In this case, for example, when viewed from the command cm3 of the channel 3 (user U3), the commands cm1, cm4, and cm5 are in the first rank, second rank, and third rank, respectively.

  FIG. 6 shows how these commands cm1, cm4, cm5, and cm3 are sequentially executed. The time point t0 is a time point when the optical head 33 starts to move in the radial direction of the optical disc 1 from the current position to the track 1, and the time Tsa is a time required for the movement. A time point t1 is a time point when the optical head 33 reaches the track 1 and starts reading data from the track 1, and a time Tra is a time time for reading data from the track 1.

  FIG. 4 shows a case where commands cm1, cm4, and cm5 are sequentially received from time t0 to time tx, and the command cm3 is received at time tx. If the reception time of the command cm3 is after the time t2 when the execution of the command cm4 is started, the data reading for one command cm1 is completed at that time, so the command cm1 for the command cm3 is completed. Are not first order, command cm4 is first order, command cm5 is second order, and command cm3 is third order.

  However, unlike the case shown in FIG. 6, when the command cm3 is received, the command cm1 is in the first order when data is being read from the track 1 for the command cm1.

  In predicting the delay time, as shown in FIG. 5, the seek time Tsi and the read time Tri are calculated for each access command of the priority order and the access command.

  The seek time Tsi is the current position or start of movement for each access command in which the rank i is 1, 2,..., K (k is the rank of the access command to be predicted for the delay time, and 4 for the command cm3 in FIG. 4). This is the time required to move the optical head 33 from the position to the target position. In the case of FIG. 6, Ts1 = Tsax, Ts2 = Tsb, Ts3 = Tsc, Ts4 = Tsd.

  The read time Tri is the time required for data reading for each access command with the order i of 1, 2,... K. In the case of FIG. 6, Tr1 = Tra, Tr2 = Trb, Tr3 = Trc, Tr4 = Trd. It is.

  The seek time Tsi can be predicted from the difference between the current position or the movement start position and the target position, and the movement capability (movement speed) of the optical head 33 (sled 35). Further, the read time Tri can be obtained as the time until each buffer memory becomes full from the data reading speed from the optical disc 1 (data transfer speed to each buffer memory) and the storage capacity of each buffer memory.

  As described above, when the reception time tx of the command cm3 is in the middle of reading data from the track 1 for the command cm1 of the first rank, the seek time Ts1 is zero and the read time Tr1 is as shown in FIG. Becomes shorter than the time Tra shown in FIG.

  Then, the time Txy or Txz represented by the equation (1) or the equation (2) in FIG. 5 is calculated as the delay time.

  As shown in FIG. 6, the time Txy is the time from the reception time tx of the command cm3 to the time ty when data is read from the track 10 specified by the command cm3, and the time Txz is the time of the command cm3. This is the time from the reception time tx to the time tz when the data reading from the track 10 specified by the command cm3 is completed.

  The difference between the two is that the data reproduction start time by the command cm3 is set to the time point ty at which one time of reading data from the optical disk 1 is started and one time of data is transferred and accumulated in the buffer memory 453, or once from the optical disk 1. Thus, any one of them may be calculated. This is the difference between the time point tz at which the reading of the data is completed, the reading of the data for one time from the buffer memory 453 and the decoding of the data for one time by the decoder 473 is started.

  The above is a case where the delay time for the command cm3 is calculated when the command cm3 is received, but the delay time for the commands cm4, cm5, cm2 is similarly calculated when the command cm4, cm5, cm2 is received. .

  FIG. 7 shows an example of this time calculation processing routine executed by the system controller 51 (CPU).

  In the time calculation processing routine 80 of this example, the processing is started with the optical disc 1 loaded on the disc reproducing apparatus 10, and it is first determined in step 81 whether or not there is an access command. In step 82, the access command is accepted and written in the FIFO command queue 53.

  Next, proceeding to step 83, it is determined whether or not there is a prior access command for the access command. If there is no prior access command, the access command is executed immediately and the delay time is negligible. Therefore, the process returns to step 81 without calculating the delay time.

  When there is a prior access command, the process proceeds from step 83 to step 84, the seek time Tsi described above is calculated for each access command of the prior order and the relevant order, and then the process proceeds to step 85, where For the access command, the above-described read time Tri is calculated, and the process further proceeds to step 86, where the delay time Txy is calculated by equation (1) in FIG.

  In this example, the process further proceeds to step 87, and the delay time Txy of the calculation result is converted into the content information data by the image data stored in the storage unit 59 in the disk playback system of the example of FIG. 3 and displayed on the display 216 of the video / audio output device of the corresponding channel in the disc reproduction system of the example of FIG.

  For example, as shown in FIG. 8, the image data as the content information data is data for displaying the delay time presentation screen 5 having a content such as “ch: about seconds until reproduction”, the corresponding channel number, and calculation. The number of seconds of the delay time is applied to this, and the contents such as “ch3: about 7 seconds until reproduction” are displayed on the display screen 57a of the display unit 57 or the display 216 of the video / audio output device of the corresponding channel. To display.

  Furthermore, in this case, as time elapses, the time until the start of data reproduction by the access command gradually decreases. Therefore, in the disk reproduction system of the example of FIG. 2, as shown in FIG. For each access command that is in the lower order or lower order, in the disc playback system of the example of FIG. 3, for each access command of the corresponding channel, the time until the start of data playback by the access command is set as the waiting time. You may make it display decreasing by a second unit.

  The delay time of the calculation result depends on the audio data stored in the storage unit 59 as the content information data, and in the disk reproduction system of the example of FIG. 2, from the speakers 113L and 113R or the headphones 118 of the audio output device of the corresponding channel. In the example 3 disc playback system, each of the speakers 217 of the video and audio output device of the corresponding channel may be presented with a voice such as “Please wait for about 7 seconds until playback”.

  As described above, by presenting the delay time as an image (screen) or sound, even when it takes time to actually start playback and obtain playback output during an access operation, the user can use the disc playback system. If the device malfunctions or breaks down, it will not be mistaken, and the approximate time until the reproduction output can be obtained can be known.

[Other Embodiments]
The disk medium on which content data such as music data and video data is recorded is not limited to an optical disk, but may be a magnetic disk or a magneto-optical disk. The content data recorded on the disk medium is not limited to music data or video data, but may be a computer program such as game software.

It is a figure which shows an example of the disc reproducing | regenerating apparatus of this invention. It is a figure which shows an example of the disc reproduction | regeneration system of this invention. It is a figure which shows the other example of the disc reproduction | regeneration system of this invention. It is a figure which shows an example of the write state of a FIFO command queue. It is a figure which shows the type | formula used for description of calculation of delay time. It is a figure which shows the time relationship used for description of calculation of delay time. It is a figure which shows an example of a time calculation processing routine. It is a figure which shows an example of the presentation method of delay time. It is a figure which shows the example in the case of presenting waiting time. It is a figure which shows the access operation in the case of multi access. It is a figure which shows the data reproduction | regeneration in the case of multi access.

Explanation of symbols

  Since all the main parts are described in the figure, they are omitted here.

Claims (3)

A disk playback method executed by a controller of a disk playback device that accesses a disk medium in which content data is recorded for each channel and plays back the content data of each channel from the disk medium,
When receiving an access command to the disk medium, a first step of determining whether or not there is a priority access command for the access command;
When it is determined in the first step that a priority access command exists, the time required to move the read head to the target position on the disk medium for each priority access command and the access command. And a second step of calculating a time for reading the content data from the disk medium for each of the access commands at least in order of precedence, and calculating a sum of the calculated times as a delay time for the access command. When,
The delay time calculated in the second step is used as the time required to start the reproduction of the content data specified by the access command, and the reproduction of the image data or audio data recorded in advance in the disc reproduction apparatus is performed. A third step of presenting to the user of the channel of the access command by:
A disc playback method comprising: A mechanical deck unit that accesses a disk medium in which content data is recorded for each channel and reads the content data of each channel from the disk medium;
The read content data of each channel is stored in a buffer memory for each channel, and a reproduction processing unit that reads from the buffer memory,
A control unit for controlling the mechanical deck unit and the reproduction processing unit,
Its control part is
When receiving an access command to the disk medium, a first step of determining whether or not there is a priority access command for the access command;
When it is determined in the first step that a priority access command exists, the time required to move the read head to the target position on the disk medium for each priority access command and the access command. And a second step of calculating a time for reading the content data from the disk medium for each of the access commands at least in order of precedence, and calculating a sum of the calculated times as a delay time for the access command. When,
The delay time calculated in the second step is used as the time required to start the reproduction of the content data specified by the access command, and the reproduction of the image data or audio data recorded in advance in the disc reproduction apparatus is performed. A third step of presenting to the user of the channel of the access command by:
A disk playback device that executes A disc playback system comprising the disc playback apparatus according to claim 2 and a terminal that receives a content playback output obtained from the playback processing unit.

Images