JP2569565B2 - Erasing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium information erasing device suitable for use in a still image recording device such as a magnetic disk.

[Conventional technology]

One field or magnetic disks used one frame of the still image and the audio signal to the still image recording and reproducing apparatus designed to record, as shown in FIG. 4, a concentric track 2 ₁ of example 50 present on the disc 1, 2 _2, 2 ₃ ......... 2 ₅₀ is made to be provided. The case of recording moves the head 3 to a desired track while selecting a track 2 ₁ to 2 ₅₀ of the 50 present, 1 of one field in the track still picture signal or a predetermined time audio signal of an arbitrary I try to record on a track. In an apparatus for recording a still image of one frame, two heads 3 are provided, and two adjacent heads are supplied to these two heads while supplying an odd field signal and an even field signal. I try to record on tracks. As for the audio signal, a signal obtained by compressing the audio signal for 5 seconds, 10 seconds or 20 seconds is recorded on one track.

Such a still image recording / reproducing apparatus often records a video signal and an audio signal in association with each other. In this case, the tracks that constitute one group in relation to each other are not always recorded continuously, and for example, as shown in FIG.

Examples of the FIG. 5 shows the case of audio tracks A _mn of two groups the audio signals of the two programs is recorded, the audio track A ₁₁ to A ₁₄ of the first program is recorded a first group including, but a second group including audio track a ₂₁ to a ₂₄ of the second program is recorded is present, these tracks a ₁₁ ~
A _14, A ₂₁ ~A ₂₄ are recorded jumbled not be recorded sequentially in series along the disk.

[Problems to be solved by the invention]

As shown in FIG. 5, there is a case where an audio track (or a video track) constituting each group is completely arbitrarily recorded and erased in order to rewrite all the audio tracks or the video tracks of one group of the disc. is there. For example, tracks A ₁₁ to A ₁₁ forming the first group in FIG.
To erase ₁₄ only, the user track A ₁₁ to A ₁₄ is because hardly understand where it is in the position of the disc, without error one by one erase while these tracks A ₁₁ to A ₁₄ looking one by one It was very difficult to do. If even one track is erased by mistake, continuous recording will be destroyed and an error will occur during reproduction.

[Means for solving the problem]

In the present invention, a plurality of tracks are provided, and each track is provided with a first signal composed of a video signal or an audio signal or a second signal composed of a video signal or an audio signal in association with the first signal. An eraser that erases the video signal or the audio signal from a recording medium that is recorded and recorded on an arbitrary track that is not affected by the position of the track on which the first signal is recorded,
The first signal and the second signal stored in each track are classified into a plurality of groups depending on whether they are related to each other, and storage means for storing the classification information, and a designated track belongs to the group. Erasing means for detecting a track constituting a group based on the classification information and erasing all video signals or audio signals recorded on the designated track and the track detected based on the classification information. .

〔Example〕

As shown in FIG. 2, video tracks V ₁ and V ₂ on which video signals are recorded and audio tracks A on which audio signals are recorded, respectively.
_{11 ~A 13, A 21 ~A 23} , A 31 ~A 33 a description will be given of a case of erasing a disc recorded in the order shown.

In this case, the audio track A _{11 with} respect to the video track V ₁
To A ₁₃ is associated, these tracks V _1, A ₁₁ ~A ₁₃
The instruction video track and V ₁ (the A ₁₁ to A ₁₃ an instruction to V ₁₎ to the first group. Further are related audio track A ₂₁ to A ₂₃ to the video track V _2, these tracks V _2, A ₂₁ ~A ₂₃ of the instruction video track and V ₂ (A
₂₁ to A ₂₃ may instruct the V ₂₎ and the second group. The audio track A ₃₁ to A ₃₃ are not associated with the video track (otherwise indicated video track) and a third group.

In the present embodiment, in the erase mode, when one track (either a video track or an audio track) among the tracks constituting the first to third groups is designated, the audio track of the group to which the track belongs is designated. Is automatically deleted. For example, in FIG. 2, if A ₃₂ is specified, A ₃₁ , A
₃₂ and A ₃₃ are erased.

In the present embodiment, before performing an erase operation, then play back the head is moved to the track 2 ₁ to 2 _50, each audio track that is recorded in an instruction video track number, the head audio track number of the group and The audio track control data including the subordinate audio track number following the head audio track is checked at an arbitrary time, and the group configuration is stored.

The above-mentioned audio track control data in the case of FIG. 2 is as shown in the following table.

Based on this control data, the audio track of the group to which the designated track belongs can be deleted. still,
In the above table, the subordinate audio track number may be the audio track number existing next to the head audio track on the disc.

FIG. 1 shows an embodiment of a circuit for performing the above-described erase operation.

In FIG. 1, the disk 1 is driven to rotate by a motor 4, and the motor 4 is driven by a motor drive unit 6 controlled by a system control unit 5. First, when the operation unit 7 is operated to set the apparatus to the erase mode, the apparatus temporarily enters the reproduction mode, and the reproduction / erasure changeover switch 8
Is closed to the contact PB side. The switch 8 is operated by a switch driving unit 9 controlled by the system control unit 5. Next, a head movement signal is output from the system control unit 5, and the head movement signal is applied to the head control unit 11 through the head position calculation unit 10. By the head control unit 11 controls the head drive unit 12 in response to this, the head 3 is sequentially reproduced from the outermost track 20 ₁ of the disk 1 (or the innermost track 2 _50). The reproduced signal is supplied from the head 3 to the signal recording / reproducing unit 14, the reproduced signal detecting unit 15, and the audio control data detecting unit 18 through the contact point PB of the switch 8 and the reproducing amplifier 13.

The reproduction signal detection section 15 detects the envelope of the reproduction signal (RF signal), and this envelope detection signal is supplied to the system control section 5 and the head position calculation section 10. Head position calculating unit 10 takes the tracking of the head 3 at the rate of 10 steps per track and detects the presence or absence of each track 2 ₁ to 2 ₅₀ for the signal, calculated based on the peak position of the envelope, each track Send an optimum head position relative to 2 ₁ to 2 ₅₀ to the system control unit 5. The system control unit 5 based on this, each track 2 ₁ to 2 ₅₀ for recorded as or recording state storage unit and the data of the data and the head position indicating which blank track 16
To memorize. The recording state storage unit 16 receives data indicating whether each of the recorded tracks is a field still image or a frame still image, data such as date, playback signal detection, and audio signal detection from the signal recording / reproducing unit 14. And these data are also stored at the same time. The control data detected by the audio track control data detection unit 18 is stored in the audio information storage unit 19 through the system control unit 5 as the table.

Thus, with the search for all the tracks 2 ₁ to 2 ₅₀ terminates the switch 8 is switched to the contact ERS, the behavior erasing current generator 17, the erase current is supplied to the head 3 via a switch 8, All audio tracks to which the track with the designated track number belongs are erased. The operation of designating the track number to be erased may be performed, for example, when the erase mode is set.

FIG. 3 shows a flowchart of the system control unit 5 when the above-described erasing operation is performed.

In FIG. 3, when the erase mode is set in step (1), it is next checked in step (2) whether or not the erase switch has been pressed. If the erase switch is ON, the head sequentially checks each track as follows. First, in step (3), it is checked whether the track is a ghost track (a track on which a signal is recorded but it is impossible to identify whether it is video or audio), and if it is not a ghost track, Proceeding to step (4), it is checked whether the track is a video track. If the track is a ghost track or a video track, an erase mark indicating that the track may be erased is set for the track number in step (5), and the track number is set to the designated video track number. And stored in step (6).

If it is neither a ghost track nor a video track, it is checked in step (7) whether the track is an audio track. If the track is an audio track, after setting the erase mark of the track number in step (8), it is checked whether the audio track has an instruction video track or an audio-free imageless audio track without the instruction video track. Can be If there is a designated video track, the designated video track number is stored in step (10), and then the process proceeds to step (11).

The step (6) is also connected to the step (11). When the erase mark setting and the instruction video track number storage are completed for the video track and the audio track, respectively, this step (11) is performed. ), The track number is incremented by one and the next track is operated by one. First, in step (12), it is checked whether the next track number exceeds "50". If the track number is less than "50", it is checked in step (13) whether it is an audio track. . If it is an audio track, it is checked in step (14) whether or not the indicated video track number indicated by the audio track matches the indicated video track number previously stored in step (10). If they match, the erasure mark of the track number is set in step (15), and the process returns to step (11) to perform the same operation on the next track. Also, when the two do not match or when it is determined in step (13) that the track is not an audio track, the process returns to step (11).

The operations of steps (11) to (15) are sequentially performed for each track until the track number exceeds "50" in step (12). If the track number exceeds "50" in step (12), the flow advances to step (16) to perform the above-described erasing operation on the designated track having the erase mark. When the erasing is completed, the still image recording / reproducing apparatus enters a recording standby state in step (17). If it is determined in steps (3), (4), and (7) that it is neither a ghost track nor a video track or an audio track, the recording standby state is set in step (17).

Next, in step (9), when it is determined that the audio track is the imageless signal, step (18)
The head audio track number of the group to which the audio track belongs is stored. When this is completed, the next operation is performed on the next track by incrementing the track number by one in step (19). First, in step (20),
It is checked whether or not the track number advanced by "50" is greater than "50". If the track number is "50" or less, whether or not the track is an audio track is checked in step (21). If it is an audio track, it is checked in step (22) whether or not the head audio track number of the group to which the audio track belongs matches the head audio track number previously stored in step (18). If they match, the erasure mark of the track number is set in step (23), and the process returns to step (19) to perform the same operation on the next track. Also, when the two do not match or when it is determined in step (21) that the track is not an audio track, the process returns to step (19).

The operations of steps (19) to (23) are sequentially performed for each track until the track number exceeds "50" in step (20). If the track number exceeds "50" in step (20), the flow advances to step (16) to perform the above-described erasing operation on the designated track having the erase mark. When the erasing is completed, a recording standby state is set in step (17).

In the above, the case where only the audio track is deleted has been described, but one or both of the audio track and the video track may be deleted.

〔The invention's effect〕

According to the present invention, when a video track and an audio track are associated with each other and divided into a plurality of groups, and the tracks constituting each group are mixedly recorded on a recording medium, the audio track and the audio track of a specific group are recorded. And / or all of the video tracks can be automatically deleted without error by simply specifying one track of the group.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing an example of a recording state of a video track and an audio track on a magnetic disk, FIG. 3 is a flowchart of a system control unit, and FIG. FIG. 5 is a plan view of a magnetic disk to which the present invention can be applied, and FIG. 5 is a diagram showing an example of a recording state of an audio track on the magnetic disk. In still code used in the drawings, 1 ...... the magnetic disk 2 ₁ to 2 ₅₀ ...... track 5 ...... system control unit V _1, V ₂ ...... visual track _{A 11, A 12, A 13} ...... audio track A ₂₁ , A ₂₂ , A ₂₃ … Voice tracks A ₃₁ , A ₃₂ , A ₃₃ … Voice tracks 17… Erase current generation part 18… Voice control data detection part 19… Voice information storage part.

Claims (1)

(57) [Claims] A plurality of tracks are provided, and each track includes a first signal composed of a video signal or an audio signal or a second signal associated with the first signal and composed of a video signal or an audio signal. Recorded, wherein the second signal is the first signal
An erasing device for erasing the video signal or the audio signal from a recording medium recorded on an arbitrary track that is not affected by the position of the track on which the signal is recorded, wherein the first signal and the The second signal is classified into a plurality of groups depending on whether or not they are related to each other, and storage means for storing the classification information, and tracks constituting the group to which the designated track belongs are detected based on the classification information. And an erasing means for erasing all video signals or audio signals recorded on the designated track and the track detected based on the classification information.