JP2913673B2 - Erasing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an erasing device, and more specifically, to an erasing device for erasing a specified recording content of a recording medium.

[Prior Art] For example, a still video defined by a still video round-table conference
A recording / reproducing apparatus using a video floppy as a recording medium has an erasing function for erasing unnecessary recorded contents. As an erasing procedure, a magnetic head is moved to an arbitrary track to be erased, and an erasing current is applied to the magnetic head according to an operation of an erasing switch to erase a signal of the track, or according to a predetermined switch operation. There is a method of sequentially erasing the signals of all tracks from the outermost first track to the innermost 50th track.

In the still video floppy, there are 50 tracks from the outermost first track to the innermost 50th track, and each track can record a video signal of one field. Two adjacent tracks are used for recording one frame of video. In addition, a recording format such as a date, a time, a track number, field / frame identification information, and a user code is defined as identification information associated with a still image to be recorded, that is, ID information.

[Problem to be Solved by the Invention] In such a still video floppy, each track can be individually erased and recorded, so after once recording up to the 50th track, after erasure / recording is repeated,
Unrecorded tracks are distributed in a discrete manner. In other words, the recorded video is not necessarily recorded in the order of the track numbers. Such work cannot be performed efficiently. That is, in the conventional example, reproduction is performed sequentially from the first track, the recording date is confirmed from the date / time information of the ID information for each track, a memo is made on paper as necessary, and after checking all the tracks, The oldest recorded video or a track of a recorded video deemed unnecessary is individually designated and erased. This is an extremely cumbersome operation. In addition, there is a possibility that a new video is erased by mistake.

An object of the present invention is to provide an erasing device that can perform an erasing operation more efficiently.

[Means for Solving the Problems] An erasing apparatus according to the present invention comprises: an identification information reproducing unit that reproduces identification information indicating the date and time when the recording information was recorded from a recording medium on which a plurality of recording information is recorded; Is given, the erasing processing means for erasing the plurality of pieces of recording information sequentially in the order according to the date and time indicated by the identification information, and manual processing is performed when the erasing processing means sequentially performs the processing. And control means for stopping the processing of the erasure processing means in response to an instruction.

[Operation] According to the above means, the erasing processing means sequentially erases the recording information in the order according to the recording date and time in response to the erasing instruction, so that it is not necessary to check the recording date and time each time. In addition, since this processing can be stopped by manual instruction, it is possible to prevent readout of record information in a desired date range by a simple operation.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
10 is a photographing lens, 12 is a mechanical shutter, 14 is a drive circuit of the shutter 12, 16 is an image sensor, 18 is a process circuit that forms a luminance signal and a color difference signal from the output of the image sensor 16, and 20 is an output from the process circuit 18. A recording circuit for performing a recording process such as modulation on a luminance signal and a color difference signal, a switch 22 for switching between recording, erasing and reproduction, a video floppy 24 as a recording medium, a motor 26 for rotating the floppy 24, and a motor 28. Servo circuit to control the rotation of the, 30 is a magnetic head,
32 is a head moving motor for moving the magnetic head 30 in the radial direction of the floppy 24, 34 is a drive circuit of the motor 32, 36 is an erasing circuit for generating an erasing signal, and 38 is a reproducing signal reproduced by the magnetic head 30 such as demodulation. A reproducing circuit for performing processing and outputting the video signal in a video signal format, a video output terminal 40, and an ID decoding circuit 42 for decoding an ID signal included in a recording signal of the floppy 24.

44 is a liquid crystal display for displaying the state of the system and various data, 46 is a clock generating circuit for generating an operation reference clock, and 48 is a system control circuit for controlling the whole system. Reference numeral 49 denotes a switch group for inputting a predetermined instruction to the system control circuit 48, a shooting preparation switch 50 closes at the first stroke of the shutter release operation, and instructs to enter a shooting preparation operation. The shutter is closed in the second stroke of the shutter release, and a photographing operation is instructed. Other modes include a recording switch 54, a reproduction switch 56, an up switch 58 for instructing track up, a down switch 60 for instructing track down, and a mode for switching the display mode and setting mode of the display device 44. There are a switch 62, an ID setting switch 64, and an erase switch 66 for instructing an erase mode.

A clock calendar circuit 101 generates date / time information. Reference numeral 102 denotes a modulation circuit that performs, for example, DPSK modulation on date / time information output from the clock circuit 101 as ID data. A counter 104 counts a 4-digit serial number to be recorded as ID data, and is incremented each time shooting is performed.

Next, the operation of FIG. 1 will be described with reference to FIG. In the present embodiment, the intention of erasing uses a shutter release. That is, the shutter release operation in the erasing mode is regarded as the will of erasing, and the erasing circuit 36 is accordingly operated.
Then, an erasing current is applied to the magnetic head 30.

When the floppy disk 24 is loaded (S1), the magnetic head 30 is sequentially sent to each track, the ID signals of all the tracks of the loaded floppy disk 24 are read, and the ID date and time of each track are stored in the memory ( S2). Next, the erase switch
It is checked whether 66 is ON or not, that is, whether it is in the erase mode or not (S3).
If the mode is not the erasing mode, the recording / reproducing operation is effected according to the recording switch 54 or the reproducing switch 56, and the processing ends (S1).
1). In the erase mode, according to the data stored in S2,
The magnetic head is moved to the oldest track in terms of date and time (S4), and the date, time and track number of the track are displayed on the display device 44 (S5). Then, the photographing switch 54 is checked (S6).
Then, an erasing current is applied to the magnetic head 30 to erase the recording signal of the track (S7). If the shooting switch 54 is off, the process proceeds to S8 without erasing.

The erase switch 66 is checked (S8). If it is off, the erase mode is regarded as canceled and the process proceeds to S11. If it is on, the head 30 is sent to the next old track until the last track (S9) (S9). S10), repeat from S5. When the above operation has been performed on all the tracks, the process ends.

In FIG. 2, the erasure is confirmed in S6 and the erasure is performed when the switch 52 is on. Conversely, when the switch 52 is on, the next track is moved without erasing. Alternatively, the erasure may be performed when the switch 52 is off. This is more convenient when there are many tracks to be erased.

In the above embodiment, the track order for erasing is
We used date / time data, but instead
Data may be used. The user data is numeric data of several digits, and the number is increased by one for each recording. The magnetic head may be moved in ascending order of the data.

In the case of a floppy recorded by a still video device without an ID recording function, date / time data or user data cannot be obtained. For such a floppy, the presence or absence of an ID may be determined in S2 of FIG. 2 and the process may be shifted to a routine for reproducing in the order of tracks as in the related art.

In this embodiment, a still video floppy is used as a recording medium, but such a medium may be a tape-like medium, an optical recording medium, or a solid-state memory such as a semiconductor memory. Further, the ID information may be data that is recorded by being frequency-multiplexed with the video signal, or may be data that is recorded by time division without being frequency-multiplexed.
Further, information other than the video signal, for example, an audio signal may be deleted.

According to the present embodiment, since the head moves in the recording order,
Even when old records and new records are mixed, the old records can be surely erased, and the operability is greatly improved. Also, the possibility of erroneously erasing a new record is reduced. Furthermore, when recording, it is not necessary to worry about the order on the track, and the operability of recording, reproduction, and erasure is significantly improved.

[Effects of the Invention] As can be easily understood from the above description, according to the present invention, when erasing a plurality of pieces of record information on a recording medium, the pieces of record information are sequentially erased in the order of recording date, Since the sequential processing can be stopped according to the manual instruction, it is possible to prevent the user from reading out the record information in the desired date range by a simple operation. Therefore, the operability of erasing is improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a flowchart thereof. 16: Image sensor, 24: Video floppy, 26: Motor, 30:
Magnetic head, 38: playback circuit, 40: video output terminal, 42: ID
Decoding circuit, 44: liquid crystal display device, 48: system control circuit, 4
9: switch group, 50: shooting preparation switch, 52: shooting switch, 54: record switch, 56: playback switch, 58: up
Switch, 60: down switch, 62: mode switch, 64: ID setting switch, 66: erase switch

Claims (1)

(57) [Claims] An identification information reproducing means for reproducing identification information indicating the date and time when the recording information was recorded from a recording medium on which a plurality of recording information is recorded; Erasing processing means for erasing the plurality of pieces of recording information in order according to the date and time indicated by the information; and
Control means for stopping the processing of the erasure processing means in response to a manual instruction.