JPH0666933B2 - Playback device - Google Patents

Description

The present invention relates to a disc reproducing apparatus, and more particularly to a reproducing apparatus for reproducing a disc on which audio tracks and video tracks are recorded and formed.

[Outline of Invention]

The present invention, in a reproducing apparatus for reproducing a disc in which audio tracks and video tracks are mixedly recorded and formed, is capable of recording a series of audio signals over a plurality of tracks, and the audio tracks are provided with the series of audio signals. The information signal including the first track number, the subsequent track number, and the video track number on which the corresponding video signal is recorded is recorded, and at the time of reproduction, all tracks are scanned and the information signals of these audio tracks are reproduced to reproduce the table memory. By writing the data in the corresponding position and controlling the reproducing operation based on the written information signal, a desired series of audio signals and corresponding video signals can be reproduced smoothly and quickly.

[Conventional technology]

The applicant of the present application has previously proposed, for example, in Japanese Patent Application Laid-Open No. 58-218004, in which a so-called electronic still camera for recording a still image can also record audio. Video signal tracks and audio signal tracks are mixed on a disc recorded by such an electronic still camera with an audio recording function. As the recording form of the audio signal, there are one that ends in a single track and one that is recorded over a plurality of tracks, and there is a case where a video signal corresponding to the audio signal exists and a case where it does not exist
These pieces of information are recorded in the control data recording area in the audio signal track. That is, when a series of audio signals are recorded over a plurality of tracks, the beginning track number (or address) and the succeeding track number (address) are recorded in the control data recording area and correspond to each other. When a video signal is present, the video track number (address) is recorded in the control data recording area.

[Problems to be solved by the invention]

By the way, the recording format of the video signal track is not set to record information about the track of the corresponding audio signal. For this reason, when playing a disc in which video tracks and audio tracks are mixed, if the playback head plays the video tracks on the disc first, this audio signal will be reproduced even if there is a corresponding audio signal. There is a risk that it may not be possible to play back the image at the same time. This means that when there are a plurality of sets of audio signals over a plurality of tracks, the same inconvenience occurs when the-sequence is completed and the sequence shifts to another sequence.

The present invention has been made in view of such a conventional situation, and it is possible to smoothly generate a desired one of a series of temporally continuous audio signals and corresponding video signals without losing the relation between audio and video. It is also an object of the present invention to provide a reproducing device that can be quickly reproduced.

[Means for solving problems]

In order to solve the above problems, the reproducing apparatus of the present invention is
At least video signals and audio signals are selectively recorded on a plurality of recording tracks formed on the disc, and the audio track is the beginning of temporally continuous audio signals recorded over a plurality of tracks. In reproducing a disc on which an information signal including a track number and a succeeding track number and a video track number on which a video signal corresponding to an audio signal of an audio track is recorded, all recording tracks on the disc are scanned. To reproduce at least the information signal, write the reproduced information signal in correspondence with the track number arranged in the table memory, and reproduce the audio track and the video track based on the written information signal. It is characterized by controlling the operation.

[Work]

By the information written in the table memory, the sequence of the audio signal and the corresponding video signal can be obtained as the track number data, and the track position control of the reproducing head is performed according to the obtained track number data, so that the desired position can be obtained. It is possible to smoothly and quickly reproduce a series of audio signals and corresponding video signals.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a schematic configuration of a reproducing apparatus according to an embodiment of the present invention, which is a reproducing apparatus capable of reproducing a disc D recorded by an electronic still camera having an audio recording function as described above. Shows.

In FIG. 1, the signal reproduced from the disk D by the magnetic head 1 is supplied to the FM demodulation circuit 2. While the magnetic head 1 scans the video track on which the video signal is recorded, the demodulated signal is taken out from the output terminal 5 as a video signal via the de-emphasis circuit 3 and the reproducing circuit 4 having the non-linear characteristic.

When the magnetic head 1 is scanning the audio track on which the audio signal is recorded, the demodulated signal from the FM demodulation circuit 2 is transferred to the A
It is supplied to the / D conversion circuit 12, converted into a digital signal by the A / D conversion circuit 12, and sent to the memory 13 for time-axis expansion. In the memory 13, the digital signal is extended at a high speed and read at a low speed by an address counter 26, which will be described later, so that the digital signal is expanded in time axis by, for example, 640 times and returned to the original time axis of the audio signal before recording. . The time-axis expanded digital signal from the memory 13 is sent to the D / A conversion circuit 14 and converted into an analog signal, and passes through a noise reduction decoder 15 to
A continuous audio signal is output from the output terminal 16.

Here, the recording format of the audio signal will be briefly described. In FIG. 2, an arbitrary audio track AT on the disc _D is divided into, for example, four sectors S _A , S _B , S _C and S _D. In one sector, a time axis compressed audio signal AS based on the format (sector format) as shown in FIG. 3 is recorded. A start identification signal SID as a start flag and an end identification signal EID as an end flag are arranged in front of the audio signal AS and at a predetermined position, for example, the signals SID and A.
An information signal API serving as a control code for controlling the reproduction operation of the audio signal is arranged between S and S.

Here, the disk D is driven to rotate at, for example, 3600 rpm, and at this time, the head scanning time for one track is 1 /
Since it will be 60 seconds, one sector will be about 1/240 second and the third
Although the recording time of the audio signal AS in the figure is shorter than this, the time axis of the audio signal to be recorded is, for example, 1/64
By compressing to about 0, it is possible to record an audio signal for about 10 seconds per track. Furthermore, for a longer continuous audio signal, it is possible to record over multiple tracks, and the information indicating the relationship between the tracks at this time is part of the information signal API that is the control code. Is recorded as. This information signal A
The PI also includes information on the recording track number (address) of the video signal corresponding to the audio signal recorded on the track.

A so-called overlap portion OVL that overlaps the adjacent end of the audio signal of the adjacent sector is provided at the end of the audio signal AS in FIG. 2 to enhance the continuity of the audio signal between the sectors.

Referring again to FIG. 1, when scanning the audio track, the output signal from the de-emphasis circuit 11 is supplied to the identification signal detection circuit 21 and the information signal detection circuit 22. The start identification signal SID and the end identification signal EID detected by the identification signal detection circuit 21 are the timing signal generation circuit 23.
Sent to. The start identification signal SID is also sent to the information signal detection circuit 22, and the information signal API detected by the information signal detection circuit 22 at the timing based on the start identification signal SID is also sent to the timing signal generation circuit 23. . The information signal API is also supplied to the system controller 24, and the system controller 24 controls the entire apparatus. In addition, the system controller 24
The video sync signal extracted from the reproduced video signal to the terminal 5 through the sync separation circuit 6 is also supplied.

In addition, a signal of a predetermined frequency ₀ is sent from the oscillator 25 to the A / D
In addition to being supplied to the conversion circuit 12, it is also supplied to an address counter 26 for controlling write / read driving of the memory 13. The signal of frequency _C, for example, the frequency of 1/640 of the signal output from the oscillator 25 _0/6
40 signals are output from the oscillator 27 and supplied to the D / A conversion circuit 14 and the address counter 26, respectively. Next, the pickup head 28 inspects the magnetic piece G provided on the disk rotation drive shaft of the motor M for disk rotation drive and the like so that a pulse having a cycle of, for example, 1/60 second corresponding to the rotation cycle of the disk D is detected. The signal is output and sent to the timing signal generation circuit 23. Timing signal generation circuit 23
, A timing signal is generated based on this pulse signal having a cycle of 1/60 second, and this timing signal is supplied to the address counter 26.

That is, for example, the writing of the signal to the memory 13 is started from the start point of the audio signal AS after a predetermined time determined by the format of FIG. 3 from the detection time point of the start identification signal SID, and thereafter, the signal of frequency ₀ from the oscillator 25 is output. Writing is continued by using as a clock. Read the oscillator
The signal of the frequency _{C (= 0/640)} from the 27 as a clock, is performed at a rate of 1/640 of the time of writing, the audio signal is time expanded shaft 640 times back to the time axis before the original recording Will be done.

Further, the system controller 24 controls writing / reading of some data in the information signal API to the table memory 31 described later, and sends at least a part of the stored contents of the memory 31 to the monitor output device 32. indicate.
The system controller 24 also includes a keyboard input device 33.
In response to input from, or by an internal program
The head drive motor 9 is driven and controlled via the head drive circuit 8 to control the track position of the magnetic head 1 on the disk D.

By the way, in the information signal API detected by the information signal detection circuit 22, when the audio signal of the track currently being reproduced is a part of a series of audio signals stored over a plurality of tracks, The data of the track number (starting track number Nf) in which the beginning part of the audio signal of is recorded and the number of the track in which the audio signal following the audio signal of the currently playing track is recorded (successor track number Nn) If the video signal corresponding to the audio signal of the track currently being reproduced is present, the track number (corresponding track number N
The data of c) are also included.

A table memory 31 using a RAM (random access memory) or the like is provided in order to store each track number in a table, and the memory 31 includes:
Each track number data from the information signal detection circuit 22 is written via the system controller 24,
Each track number data read from the memory 31 is supplied to the system controller 24.

Here, FIG. 4 shows an example of a memory map of such a table memory 31. In FIG. 4, 1
A memory block for tracks is composed of 26 bits of bits b _{0 to} b ₂₅ , 6 bits of bits b _{0 to} b ₅ are assigned to own track number Nt, and audio signal recording track AT is assigned at bit b _6. Is indicated by bit b ₇ and whether or not it is a video signal recording track VT is indicated by bit b ₇ . Also, 6 bits of bits b _{8 to} b ₁₃ are assigned to the above head track number Nf, and 6 bits of bits b _{14 to} b ₁₉ are assigned to the following track number Nn, respectively, and bits b _{20 to} b ₂₅ are assigned.
Is assigned to the corresponding track number Nc. Such a 26-bit memory block is prepared for the total number of tracks that can be recorded on one disk, for example, 50 tracks.

When reproducing a disc in which audio recording tracks and video recording tracks are mixed, first, all the tracks on the disc are scanned, and at least the information signal API is sequentially read from, for example, the first track, and the obtained track number Nf is obtained. , Nn, Nc are written in corresponding positions in the table memory 31 together with their own track numbers Nt. The data of each of these track numbers Nf, Nn, Nc can be obtained
This is only for audio tracks.For video tracks, the system controller 24 processes the data when the data of the corresponding audio tracks is obtained or after the data of all the audio tracks are written on the table. By doing so, the track number Nc of the audio track corresponding to the video track, the above-mentioned first track number Nf and the subsequent track number Nn relating to the audio track are obtained, and these are written to the corresponding location in the memory block of the video track. . That is, the corresponding track number Nc in the case of a video track is the number of the track on which the audio signal corresponding to the video signal is recorded, and Nf and Nn are the numbers of the above-mentioned first track and subsequent tracks for this corresponding audio signal. Become. The table as shown in FIG. 5 can be obtained as described above.

In the table shown in FIG. 5, for example, the track number Nt is 1 according to the scanning order at the time of scanning all tracks.
The sequence is such that the system controller 24 can perform the reproduction operation for each sequence of a series of audio signals even in this form, but it is meant to reduce the load of the program processing in the system controller 24. Therefore, for example, it is desirable to collect those having the same head track number.

That is, in FIG. 6, those having the same head number are rearranged according to a sequence, that is, according to the temporal order of a series of audio signals, and a corresponding video signal track is arranged immediately after the series of audio signal tracks. Shown is the organized one. For example, in FIG. 5, the tracks with Nt of 1,4,7 indicate the audio tracks in which a series of audio signals are recorded in this order, and correspond to the audio signals recorded with the tracks of Nt of 4. The video signal is recorded on the track with Nt of 5. Therefore, in FIG. 6, the track numbers Nt are rearranged in the order of 1, 4 and 7 in accordance with a series of audio signal sequences, and immediately after Nt = 7, the corresponding video signal Nt =
Data of 5 tracks are arranged.

Such a table of FIG. 6 (or the table of FIG. 5 may be used) is stored in the memory 31 to the system controller 24.
And is displayed on a monitor output device 32 such as a CRT display device. The display form at this time may be the same as that of the table of FIG. 6, or a part thereof may be extracted and displayed. While referring to such a table display or the like, the user or the operator uses the keyboard input device 33 or the like to select the voice and video of a desired sequence and perform an input operation, whereby the selected voice and video are displayed. Is played. In addition, the display of the playback video and the display of the data from the system controller 24
The same monitor output device may be used.

Here, as an example of the reproduction operation by the keyboard input device 33, when the track number Nt in the table of FIG. 6 is designated, the system controller 24 sets the table memory 31.
The memory block of the specified track number Nt in the table shown in FIG. 6 is read out, and in the case of an audio track, the head drive circuit 8 is controlled so as to sequentially reproduce from the track of the head track number Nf, Plays a series of audio signals according to a sequence including a specified track. When the designated track is a video track, since the head track number Nf of the corresponding audio signal is written in the memory block of the table, it is possible to reproduce from the head of the sequence. Further, in the table of FIG. 6, since each group is grouped for each sequence, the sequence number (for example, the leading track number Nf may be used as it is or may be sequentially and independently assigned to each sequence) is designated. It is also possible to immediately reproduce the desired sequence.

〔The invention's effect〕

The track number of a series of audio signals and the corresponding video signal can be known from the data of the first track number, the following track number, and the corresponding track number written in the table memory. Since the track number and the sequence of a series of audio signals can be known, it is possible to quickly and smoothly reproduce a series of audio signals and corresponding video signals by designating a desired track number or sequence number.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a plan view schematically showing an audio track on a disc, and FIG. 3 is an audio signal recording for one sector. FIG. 4 is a diagram showing a format, FIG. 4 is a diagram showing an example of a memory map inside the table memory, and FIGS. 5 and 6 are diagrams showing a state in which data is written in the table memory. 1 ... Magnetic head 8 ... Head drive circuit 9 ... Head drive motor 24 ... System controller 31 ... Table memory 32 ... Monitor output device 33 ... Keyboard input device D ... Disk AT ... Voice track S _A , S _B , S _C , S _D …… Sector AS …… Voice signal API …… Information signal

Front page continuation (72) Inventor Katsuhiko Ueno 6-735 Kitashinagawa, Shinagawa-ku, Tokyo, Sony Corporation (56) Reference JP-A-59-48801 (JP, A) JP-A-58-218004 (JP, A)

Claims (1)

[Claims] 1. At least a video signal and an audio signal are selectively recorded on a plurality of recording tracks formed on a disc, and the audio tracks are temporally consecutively recorded over a plurality of tracks. When reproducing a disc on which an information signal is recorded, including the first track number and the succeeding track number of the audio signal and the video track number on which the video signal corresponding to the audio signal of the audio track is recorded, all recordings on the disc are performed. The track is scanned to reproduce at least the information signal, the reproduced information signal is written in correspondence with the track number arranged in the table memory, and the audio track and the audio track are recorded based on the written information signal. A reproducing apparatus characterized by controlling a reproducing operation of a video track.