JPS6295079A - Reproducing device - Google Patents

Abstract

PURPOSE:To smoothly and rapidly reproduce a series of desired sound signal and a corresponding video signal by obtaining a sequence of the sound signal and the corresponding video signal as the track number data according to the information written in a memory for a table and controlling a track position of a reproducing head in accordance with the obtained track number data. CONSTITUTION:The memory 31 for the table using a RAM or the like is disposed, the data of a leading track number, a succeeding track number, and a corresponding track number is written. Thereby, a series of the sound signal and the track number of the corresponding video signal can be known and from the track number of the video signal, the track number of the corresponding sound signal and the sequence of the series of the sound signals can be understood. Therefore, by designating a desired track number or sequence number or the like, the series of the sound signal and the corresponding video signal can be rapidly and smoothly reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] 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 in a mixed manner.

[Summary of the invention]

The present invention provides a playback device that plays back a disc on which audio tracks and video tracks are recorded in a mixed manner. An information signal including the first track number, subsequent track number, and video track number where the corresponding video signal is recorded is recorded, and during playback, all tracks are scanned and the information signals of these audio tracks are played back to the table memory. By writing in the corresponding position of the information signal and controlling the reproduction operation based on this written information signal, it is possible to smoothly and quickly reproduce a desired series of audio signals and corresponding video signals. [Prior art] The applicant has previously disclosed, for example, Japanese Patent Application Laid-open No. 58-218004.
No. 2, etc., proposed a two-fold version of a so-called electronic still camera for recording still images so that audio can also be recorded. On a disc recorded by such an electronic still camera with an audio recording function, one image signal track and one audio word track coexist. There are two types of recording formats for audio signals: one that ends with a single rank and one that ends over multiple ranks. This information is recorded in the continuous data recording area within the audio signal track.In other words, when a series of audio signals is recorded across multiple tracks, the first If the track number (or address) and the following track number are recorded in the data recording area and a corresponding video signal 1)) exists, the number (address) of that video track.
is recorded in the control data recording area.

[Problem that the invention seeks to solve]

In the video signal I/rack recording format, information regarding the corresponding audio signal track is not set to be recorded.

For this reason, when playing back a disc on which a video track and an audio track coexist, if the playback head plays the video track on the disc first, even if there is a corresponding audio signal, There is a risk that it will not be possible to reproduce the audio signal at the same time as the video. If there are multiple sets of audio signals on multiple tracks, a similar problem occurs when the - sequence ends and the sequence moves on to another sequence.

The present invention has been developed in view of the above-mentioned conventional circumstances, and is capable of smoothly transmitting a desired series of temporally continuous audio signals and corresponding video signals without losing the relationship between the audio and video images. It is an object of the present invention to provide a playback device that can perform playback quickly.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the reproduction-left position of the present invention has a plurality of records formed on a disk. Selectively record signals and audio signals, and the audio track includes the first track number and subsequent track number for temporally continuous audio signals recorded on multiple tracks, and the audio signals of audio 1 to rank. When reproducing a disc on which an information signal including a video track number on which a corresponding video signal is recorded, all recording tracks on the disc are scanned to reproduce at least the information signal, and the reproduced information The present invention is characterized in that a signal is written to a corresponding position of a table inside a table memory, and the reproduction operation of the audio track and video track is controlled based on the written information signal.

[For production]

With the information written in the table memory, the audio signal sequence and the corresponding video signal can be obtained as track number data, and the track position of the playback head can be determined according to the obtained track number data. By performing such control, it is possible to smoothly and quickly reproduce a desired series of audio signals and corresponding video signals.

〔Example〕

Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a schematic configuration of a playback device according to an embodiment of the present invention. It shows.

In FIG. 1, a signal reproduced from a disk D by a magnetic head 1 is supplied to an F1 demodulation circuit 2. When the magnetic pad 1 is scanning a video track on which a video signal is recorded, the demodulated signal is taken out as a video signal from the output terminal 5 via a de-emphasis circuit 3 with non-linear characteristics and a reproduction circuit 4.7. Ru.

When the magnetic head 1 is scanning an audio track on which an audio signal is recorded, the demodulated signal from the FM demodulation circuit 2 is sent to the l\/Di conversion circuit 12 via the de-emphasis circuit 11 with linear characteristics. supplied, this A,/D
The signal is converted into a digital signal by the conversion circuit 12 and sent to the memory 13 for time axis expansion. In the memory 13,
Writes at high speed using address counter 26, which will be described later.
By controlling readout at a low speed, the digital signal is expanded in time by, for example, 640 times, and returned to the time axis of the original audio signal before recording. The time-axis expanded digital signal from the memory 13 is sent to the D/A conversion circuit 1.
4, where it is converted into an analog signal, passed through a noise reduction decoder 15, and taken out from an output terminal 16 as a speed-reading audio signal.

Here, to briefly explain the recording format of the audio signal, in FIG.
The audio track AT of a book is, for example, one sector SA,
The audio signal AS is divided into SB, Sc, and Sn, and each sector records an audio signal AS compressed by 11 times based on the format shown in FIG. In the front of this audio signal AS, a start identification signal SID as a start flag is traced, and in the rear thereof is an end identification signal EID as an eft flag.
, :Assignment of an information signal API serving as a control code for controlling the playback operation of the audio signal.
It is ranked.

Here, the disk D is rotated once at a speed of, for example, 3600 rpm, and the head scanning time for one track is 1760 seconds, so one sector or approximately 1/240
seconds, and the recording time of the audio signal As shown in Figure 3 will be less than this, but by compressing the time axis of the audio signal to be recorded to, for example, about 1/640, it will be approximately 10 seconds per track. It is possible to record audio signals of approximately Furthermore, it is possible to record continuous audio signals over a longer period of time across multiple tracks, and the information indicating the relationship between each track at this time is the information signal that becomes the above-mentioned Conor J-O- code. A f) Recorded as part of I. The information signals A and PI include a record I of a video signal corresponding to the audio signal recorded on the track.
・Information about the rank number (address) is also included.

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

Referring again to FIG. 1, when the audio track is scanned, the output signal from the de-emphasis circuit 11 is transmitted to the identification signal detection circuit 21 and the information signal detection circuit 21.
Start identification signal SID and end identification signal E
The ID is sent to the timing/return signal generation circuit 23. The start identification signal S is also sent to the information signal detection circuit 22, and the information 4% 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. Sent to 23rd.

The information signal API is also supplied to the system controller 24, and the system controller 24 controls the entire device. Further, the system controller 24 is also supplied with a video synchronization signal extracted from the reproduced video signal to the terminal 5 via the synchronization separation circuit 6.

Further, a signal of a predetermined frequency fO is transmitted from the oscillator 25 to the A/
It is supplied to the D conversion circuit 12, and the memory 1
3 is supplied to an address counter 26 that controls write/read drive. Further, a signal with a frequency fc, for example, a signal with a frequency fo/640, which is 1/640 of the signal output from the oscillator 25, is output from the oscillator 27,
The signal is supplied to the D/Ai conversion circuit 14 and the address counter 26, respectively. Next, the pinoqua knob head 28 inspects the magnetic piece G provided on the disk rotation 1 drive shaft, etc. of the disk rotation and drive data M, and determines the rotation period of the disk D, for example, by 1/ In the timing signal generation circuit 23, which outputs a pulse signal with a period of 60 seconds and sends it to the timing signal generation circuit 23, a timing signal based on this pulse signal with a period of 1/60 seconds is generated, and this timing signal is used as an address signal. counter 26
is supplied to.

That is, for example, writing of a signal into the memory 13 is started from the start point of the audio signal AS after a predetermined time determined by the format shown in FIG. Writing continues using this as the clock. Readout is performed using the frequency fc (= fo /64
0) signal as the clock, 1/640 when writing
The audio signal is time-expanded by 640 times and returned to the original time axis before recording.

Further, the system controller 24 controls writing/reading of some data in the above-mentioned update signal APT to/from a table memory 31 (to be described later), and outputs at least part of the stored contents of this memory 31 to a monitor output device 32. Send and display. In addition, the system controller 24 drives and controls the head 11 motor 9 via the head drive circuit 8 in response to input from the keyboard input device 33 or according to an internal program, and controls the track position of the magnetic head 1 on the disk D. control.

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 played is part of a series of audio signals stored across multiple tracks, The data of the track number (starting track number Nf) in which the leading part of the audio signal of the track currently being played is recorded, and the data of the track number (following track number Nn) in which the audio signal to be read after the audio signal of the track currently being played is recorded. ), and if there is a video signal corresponding to the audio signal of the track currently being played, data of the track number on which the video signal is recorded (corresponding track number Nc). is also included.

In order to store such track numbers in a tabular form, a table memory 31 using RAM (random access memory) or the like is provided. Each track number data is written via the system controller 24, and each track number data read from the memory 31 is supplied to the system controller 24.

Here, FIG. 4 shows an example of the memory map of such a table memory 31.
A memory block for one track is composed of 26 bits of hits b0 to b25, and hits b.

6 bits of ~b5 are assigned to the own track number Nt, and bit b6 indicates whether the track is an audio signal recording track AT or not, and hint b7 indicates whether the track is a video signal recording track VT. ○Also, 6 bits of bits b8 to b+3 are assigned to the above-mentioned first track number Nf, 6 bits of bits b14 to b19 are assigned to the above-mentioned subsequent track number Nn, and bits b to b+3 are assigned to the above-mentioned succeeding track number Nn.
bzs is assigned to the corresponding track number NC.

This 26-bit memory block is stored on disk 1.
Prepare the total number of tracks that can be recorded on the disc, for example, 50 tracks.

When reproducing a disc in which audio recording tracks and video recording tracks coexist, first, all tracks on the disc are scanned, and at least the information signal API is read out sequentially from, for example, the first track, and each of the obtained track numbers Nf is , Nn, and Nc are written into corresponding positions in the table memory 31, respectively, along with their own track numbers Nt.

Data for each of these track numbers Nf, Nn, and Nc can be obtained only for audio tracks, and for video tracks, data for the corresponding audio track can be obtained, or all audio tracks can be obtained. After this data is written on the table, the system controller 24 performs processing to write the track number NC of the audio track corresponding to the video track, the above-mentioned first track number Nf, and subsequent track number Nn regarding the audio track. These are then written to the corresponding locations in the memory block of the video track.

In other words, the corresponding track number Nc in the case of a video track
is the number of the track in which the audio signal corresponding to the video signal is recorded, and Nf and 8 are the numbers of the above-mentioned leading track and subsequent track for this corresponding audio signal. 9 and above, a table as shown in FIG. 5 can be obtained.

In the table shown in FIG. 5, the track number Nt is arranged in such a way that it increases sequentially from 1 according to the scanning order during all-track scanning. However, in order to reduce the burden of block processing on the system controller 24, it is desirable to group together the audio signals having the same first [rack number].

In other words, in FIG. 6, items with the same leading number are rearranged according to the sequence, that is, according to the temporal order of a series of audio signals, so that the corresponding video signal track is arranged immediately after the series of audio signal tracks. It shows what is organized. For example, in FIG. 5, Nt is 1.
Track 4.7 indicates an audio rack in which a series of audio signals are recorded in this order. A video signal is recorded.Therefore, in FIG. 6, the track number N1 is rearranged into items 1, 4, 7, and 5 according to a series of audio signal sequences.
The data of the track Nt=5 of the corresponding video signal is placed immediately after Nt=7.

The table shown in FIG. 6 (or the table shown in FIG. 5) is read out from the memory 31 via the system controller 24 and displayed on a monitor output device 32 such as a CRT display device. The display format at this time may be the table shown in FIG. 6 as is, or a portion may be extracted and displayed. While referring to such a table display, the user or operator uses the keyboard input device 33 or the like to select and input audio and video of a desired sequence.
The selected audio and video are played. Note that the display of the reproduced video and the display of data from the system controller 24 may be performed on the same monitor output device.

Here, as an example of the playback operation using the keyboard input device 33, when specifying the track number Nt of the table shown in FIG. The head drive circuit 8 is controlled to read the memory mic with the specified track number Nt, and when it is an audio track, to play the track sequentially from the first track number Nf, and to play a series according to the sequence including the specified track. In the case of the specified 1 to Rack or video track, the first track number Nf of the corresponding audio signal is written in the corresponding memory block of the table, so playback starts from the beginning of the sequence. be able to. In addition, in the table of FIG. 6, each sequence is divided into groups, so it is possible to use the sequence number (for example, the beginning, track number N'f as it is,
It is also possible to designate a desired sequence by sequentially and independently numbering each sequence (numbers may be assigned to each sequence independently), and it is also possible to immediately reproduce a desired sequence.

〔Effect of the invention〕

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

[Brief explanation of drawings]

FIG. 1 shows a schematic configuration of a playback device according to an embodiment of the present invention. FIG. 2 is a plan view schematically showing the audio I-rank on a disk. FIG. Figure 4 shows an example of the memory map inside the table memory, Figures 5 and 6 show the audio signal recording format.
The figure shows a state in which data has been written to the table memory. 0 1......Magnetic head 8...
...Hen 1~. Drive circuit 9...
...Head, drive motor 24...System controller 31...Table memory 32...Monitor output device 33...
...Keyboard input device D...
...Disk AT...Audio tracks SA, SB, SC, SD...Sector A,
S...Audio signal API...Information signal

Claims (1)

[Claims] 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 track includes a temporally continuous signal recorded across the plurality of tracks. When playing a disc on which information signals are recorded, including the first track number and subsequent track number for the audio signal of the audio track, and the video track number on which the video signal corresponding to the audio signal of the audio track is recorded, All recording tracks are scanned to reproduce at least the information signal, the reproduced information signal is written to the corresponding position of the table inside the table memory, and the audio track and the video track are reproduced based on the written information signal. A playback device characterized by controlling operations.