JP2714083B2 - Playback device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a playback apparatus, and more particularly, to playback of a storage medium capable of storing video information and audio information corresponding to the video information in a plurality of storage blocks in a mixed manner. And a playback device that performs the following.

[Conventional technology]

2. Description of the Related Art Conventionally, as an apparatus for reproducing data from a storage unit in which such an audio signal and a video signal are recorded, for example, an apparatus for performing recording or reproduction using a medium called video floppy is known.

[Problem to be solved by the invention]

The above-described apparatus is very useful in reproducing information recorded from a medium in which audio signals and video signals are recorded in a mixed manner, but in such an apparatus, the information recorded in each storage block of the storage means is used. When playing back the information
In this method, blocks arranged consecutively are sequentially reproduced, and there is no description on a reproducing method for designating a predetermined block address.

[Means for solving the problem]

A playback apparatus according to the present invention is an apparatus for playing back a storage medium capable of storing video information and audio information corresponding to the video information in a plurality of storage blocks in a mixed manner. Determining means for determining the type of information stored in the storage block to which the reproduction instruction has been issued; and reproducing the audio information stored in the storage block to which the reproduction instruction has been issued; Is temporarily stored in a memory different from the storage medium, and then stored in the memory while reproducing the video information from a storage block of the storage medium in which video information corresponding to audio information stored in the memory is stored. A first reproduction sequence for reading out the audio information being played, and the audio information corresponding to the video information stored in the storage block to which the reproduction instruction has been given. The audio information is reproduced from the storage block of the storage medium, and the reproduced audio information is temporarily stored in the memory, and then the video information corresponding to the audio information stored in the memory is stored in the storage medium. A second reproduction sequence for reading out the audio information stored in the memory while reproducing the video information from the block, wherein the discrimination means stores the audio information in the storage block instructed to reproduce. When it is determined that the video information is stored in the storage block to which the playback is instructed, the device is controlled to perform the playback operation in accordance with the first playback sequence. Control means for controlling the apparatus so as to perform a reproducing operation according to the second reproducing sequence.

〔Example〕

First, the recording system configuration of the video signal and the operation of each unit will be described with reference to FIG. The system controller 120 switches the recording system switch SW 110 to the image side, and when the freeze switch in the switch group 123 is pressed, the system controller 120 records the image signal input to the image recording circuit 101 as a still image in the image memory 102. With head drive circuit 1
The magnetic head H is moved to the designated track position on the magnetic disk D by 16. When the movement of the magnetic head H is completed, the still image recorded in the image memory 102 is recorded on the magnetic disk D via the pre-emphasis circuit 103 and the FM modulation circuit 111. When recording an audio signal, the audio signal input through the noise reduction encoder 104 is converted into an A / D converter by the oscillation frequency of the oscillator 118.
It is converted to a digital signal by 105. When the audio recording start switch in the switch group 123 is pressed, the system controller 120 checks the state of the switch for selecting the time compression rate of the audio signal in the switch group 123, and converts the signal into a digital signal at the selected time compression rate. Memory for stored audio signals
It instructs the address counter 112 to store it in 106. If the amount of the audio signal stored in the audio memory 106 exceeds the amount that can be written to one track of the magnetic disk D, or a request to move to another track is made by switching a still image corresponding to the audio being recorded, the system controller 120 will issue a request. After the system controller 120 moves the magnetic head H to a track on the magnetic disk D where audio can be recorded by the head drive circuit 116, the system controller 120 addresses the audio signal stored in the audio memory 106 with the oscillation frequency of the oscillator 119. Read by the counter 113 and the D / A converter 107 at the same frequency.
The analog signal is converted into an analog signal, and the flag and control code generated by the flag generation circuit 115 and the control code generation circuit 114 are added to the audio signal converted to the analog signal, and the pre-emphasis circuits 109 and F
The data is recorded on the magnetic disk D via the M modulation circuit 111. The operation of storing the audio signal in the audio memory 106 and recording the audio signal on the magnetic disk D is continued until there is no audio recording stop request or there is no empty track recordable on the magnetic disk D.

Next, the reproducing operation will be described with reference to FIG. The signal reproduced from the magnetic disk D by the magnetic head H is FM
The signal is supplied to the demodulation circuit 124. When the reproduced signal is a still image signal, a non-linear characteristic de-emphasis circuit 12
5 is recorded in the image memory 102. Image memory 102
The still image reproduced and recorded in the video signal is output to a video output terminal via a video signal reproducing circuit 126. When the reproduced signal is an audio signal, the signal is converted into a digital signal by the A / D converter 128 at the frequency of the oscillator 119 through the linear characteristic de-emphasis circuit 127. The flag and control code are extracted by the control code detection circuit 132 and sent to the system controller 120. After the timing signal generation circuit 117 detects that the flag and the control code have been extracted, the timing signal generation circuit 117 allows the address counter 113 to store the A / D-converted audio signal in the audio memory 106. . The system controller 120 sends the time compression rate of the audio signal in the control code extracted from the reproduced signal to the address counter 112, and the address counter 112 sends the audio signal stored in the audio memory 106 to the oscillator 118 according to the time compression rate. Supply to D / A converter at synchronized timing. The audio signal converted to an analog signal by the D / A converter 129 at the oscillation frequency of the oscillator 118 is output to an audio output terminal via the decoder 130. During audio playback, the system controller 120 includes an address counter 112 and an address counter.
The monitor 113 is constantly monitored to check the amount of the audio signal stored in the audio memory 106. When the amount of the audio signal decreases, the audio signal recorded on the track on the magnetic disk D specified by the control code is written into the audio memory 106. The above operation is repeated until the stop SW is requested by the stop SW or the polarity of the flag detected by the flag detection circuit 131 at the time of reproduction is determined, and it is determined that there is no track in which the sound to be reproduced next is recorded.

Next, the operation of the system controller shown in FIGS. 2 (a) and 2 (b) will be described based on the first embodiment shown in the flowchart of FIG.

When a magnetic disk is attached to this system, all tracks are accessed in advance, and for each track, whether the video signal is a video track on which a video signal is recorded or an audio signal It is determined whether the track is a recorded audio track or an empty track in which nothing is recorded, and this is stored in a memory as data (hereinafter, this is referred to as "prescan"). When an instruction to access a certain track is received from the switch group 123, it is compared with the track use status in the memory obtained at the time of the pre-scan, and the program enters the program S101 in the flowchart. First, S1
In 01, the type of information recorded in the track where the reproduction instruction is issued is determined. Here, when a video track is designated, V101 to V203 will be described. In the "audio ON" state, it is once determined whether or not there is a designated track, that is, an audio track corresponding to the designated video track (V102), and if there is, it is accessed (V10).
3) Then, once the audio data is reproduced and stored in the audio memory 106 (V104), the process moves to the designated video track (V105) and the picture is reproduced (V106), and the data in the audio memory 106 is read out. Output audio (V10
7). If the corresponding audio track does not exist, the flow branches from V102 to VIII, the display device 122 displays "No Audio" (VIII), accesses the specified track, and accesses the specified track. Output the video recorded on the

Next, in V101, the audio switch "Audio
If "OFF", only the video of the specified track is reproduced (V112 to V113). That is, "No Audio"
Is not displayed.

Next, a case where the track specified in S102 is an audio track will be described. In such a case as well, it is determined whether the audio switch is "audio ON" or not. In the "audio ON" state, the designated track is accessed (A102), and the audio data is fetched into the audio memory 106 (A103). Next, if there is a video track corresponding to this track, the head H is accessed to the track (A105), reproduction is performed, and a video signal is output (A106). Is displayed (A121), and "No Video" is displayed on the display device 122 (A122). Thereafter, in any case, the reproduction of the sound is started (A107). or,
In the case of "Audio OFF" in A102, it is displayed that the designated track is an audio track (A1
11) Then, wait for the next instruction (N110).

Finally, if the specified track is an empty track, the flow branches from S102 to N101. In this case, the video output is muted in both “audio ON” and “audio OFF” (N101), and It indicates that the track performed is an empty track (N102).

In the above embodiment, the designated track is a track on which a video signal is recorded, and when there is no corresponding audio signal, the video signal is reproduced and the display device is used.
Since this is displayed in 122, the user can know whether or not the information recorded in the designated track is a paired information of the video signal and the audio signal. If only the video signal is output on the monitor and the audio is not reproduced, the user can determine whether this is due to a malfunction of the audio reproduction system or the absence of the audio signal corresponding to the video signal being reproduced. You can know.

In the above-described embodiment, when an audio signal having no video signal corresponding to the designated track is recorded, only this audio signal is reproduced and the monitor is muted.

Next, an embodiment in which a video signal is not recorded on a designated track and an audio signal is not received when the signal is recorded will be described with reference to a flowchart of FIG.

In this embodiment, the hardware configuration is basically the same as that of the first embodiment, and the routines S101 to S1 until the track use status is checked also in software.
02, Processing routine V101 when video track is specified
To V113, processing routine N101 when an empty track is specified
To N102 are the same.

FIG. 3 is a flowchart for explaining the operation of the second embodiment of the present invention. In this embodiment, when a track on which an audio signal is recorded is designated, the video output is muted (A201), and the fact that the designated track is an audio track is displayed on the display device 122 (A20).
2). The processing routine when a track on which a video signal is recorded or an empty track is designated is the same as in the first embodiment (V101 to V113, N101 to N102), and a description thereof will be omitted.

In the above embodiment, when the audio signal is recorded on the designated track, the fact that the audio signal has been recorded on the designated track is displayed to the user, so that the monitor is simply muted. As compared with the case, the user can be informed of the operation device of the device, so that it is extremely convenient to use.

Further, the apparatus of this embodiment has an audio reproducing function, but in an apparatus having no such audio reproducing function, the track recorded with the audio is simply recorded by simply muting the track. It is impossible to determine whether there is no signal, that is, whether the track is an unrecorded track or a track on which an audio signal is recorded.
When reproduction of a track on which an audio signal is recorded is instructed as shown in the present embodiment, it is displayed that the track is a track on which an audio signal is recorded, and it is reported that the track is not an unrecorded track. Thus, it is possible to prevent new recording on such a track.

In the above embodiment, a recording apparatus having no audio reproducing function and merely having a video reproducing function cannot perform such audio reproduction even if the reproduction of a track on which an audio signal is recorded is instructed. . However, even if there is no audio reproduction function, the control code recorded together with the audio signal is detected, and the track in which the video signal corresponding to the audio signal recorded in the track instructed to reproduce from the control code is recorded. It is possible to determine the presence or absence of a video signal corresponding to the audio signal when an instruction to reproduce a track on which the audio signal is recorded is given. It is practically advantageous to reproduce a track on which such a video signal is recorded, if any.

Therefore, an embodiment having such a function will be described with reference to FIG.

FIG. 4 is a flowchart showing the third embodiment.
In the present embodiment, when a track on which an audio signal is recorded is specified, if a video track corresponding to this track exists, the video track is accessed (A30).
2) Output the video signal (A303). If there is no corresponding video track, the video output is muted (A3
04), warn that the specified track is an audio track (A305). The routine when a video track or an empty (unrecorded) track is designated is the same as that in the first embodiment (V101 to 113, N101 to 102), and a description thereof will be omitted.

According to the method of the present embodiment, when a sound is recorded on the track where the reproduction is instructed in a reproducing apparatus having no function of reproducing the audio signal, the audio signal is reproduced as noise on the monitor. Can be prevented.

Further, when there is a video signal corresponding to the audio signal recorded in the specified track, the video signal on the monitor can be interrupted as little as possible by automatically reproducing the video track. I can do it.

Next, an embodiment in which the playback sequence is changed according to whether or not the audio switch is on, that is, if the audio switch is on, the audio of the track on which the audio signal is recorded is played, and if the audio switch is off, For example, a description will be given of an embodiment in which a screen on a monitor is muted without reproducing a track on which an audio signal is recorded.

FIG. 5 is a flowchart showing the operation of this embodiment. In the embodiment shown in FIG. 5, when the audio track is designated, in the "audio ON" state, the designated track is accessed (A402), and the audio data in the track is written to the audio memory 106 (A40).
3) Start playing the audio (A404). on the other hand,
In the “Audio OFF” state, the video output is muted (A
405) Display that it is an audio track (A40
6).

The processing routine when the video track and the empty track are designated is the flow shown in FIG. 1 (V101 to V113, N101).
To N102), and a description thereof will be omitted.

In the four embodiments described above, pre-scanning is performed before performing the reproducing operation.
A device that outputs a picture on the image memory each time a track movement is instructed without prescanning, or a video output is temporarily muted if there is no image memory, and the track movement is performed. It is possible to make a decision.

In each of the embodiments described above, when an operation for accessing the audio track is received, a message indicating that the audio track is present may be displayed.

In any case, the display may be performed not only by the display device 122 but also by superimposing and displaying characters, graphics, and the like on the video output.

〔The invention's effect〕

As described above, according to the present invention, when reproducing a storage medium capable of storing video information and audio information corresponding to the video information in a plurality of storage blocks, a plurality of storage Automatically selects an optimal reproduction sequence corresponding to the type of information stored in the storage block for which reproduction has been instructed, and appropriately controls the reproduction operation in accordance with the selected reproduction sequence. A playback device that can perform the playback.

[Brief description of the drawings]

FIG. 1 is a flow chart for explaining the operation of one embodiment of the present invention, FIGS. 2 (a) and 2 (b) are block diagrams showing the configuration of an apparatus of one embodiment of the present invention, and FIGS. The flowchart is a flowchart for explaining the operation of the system controller 120. 101 is a video recording circuit, 102 is an image memory, 103 is a pre-emphasis circuit, 104 is an encoder, 105 is an A / D converter, 106 is an audio memory, 107 is a D / A converter, 108
Is an adder, 109 is a pre-emphasis circuit, 110 is a video / audio switching switch, 111 is an FM modulation circuit, 112 and 113 are address counters, 114 is a control code generation circuit, 115 is a flag generation circuit, 116 is a head drive circuit, and 117 is a timing signal. A generation circuit, 118 to 119 are oscillators, 120 is a system controller, 121 is a general-purpose memory, and 122 is a display device.

Claims (1)

(57) [Claims] 1. An apparatus for reproducing a storage medium capable of storing video information and audio information corresponding to the video information in a plurality of storage blocks, wherein the storage medium includes a plurality of storage blocks. Determining means for determining the type of information stored in the storage block to which the reproduction instruction has been issued; and reproducing the audio information stored in the storage block to which the reproduction instruction has been issued; Once stored in a memory different from the storage medium, the video information corresponding to the audio information stored in the memory is stored in the memory while reproducing the video information from a storage block of the storage medium in which the video information is stored. A first reproduction sequence for reading out audio information stored in the storage medium, and the storage medium storing audio information corresponding to the video information stored in the storage block instructed to be reproduced. After reproducing the audio information from the storage block of the above, once storing the reproduced audio information in the memory, from the storage block of the storage medium where the video information corresponding to the audio information stored in the memory is stored A second reproduction sequence for reading out the audio information stored in the memory while reproducing the video information,
When the discriminating means determines that the sound information is stored in the storage block to which the reproduction instruction has been issued, the apparatus controls the apparatus to perform the reproduction operation in accordance with the first reproduction sequence. And a control means for controlling the apparatus so as to perform a reproducing operation in accordance with the second reproduction sequence when it is determined that the video information is stored in the storage block.