JP2956202B2 - Recording device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device, and more particularly, to a recording device for digitally recording image information and the like on a tape-shaped recording medium.

2. Description of the Related Art Helical scan type magnetic recording / reproducing devices are widely used for recording large amounts of information, such as video tape recorders (VTRs). In recent years, this technology has also been applied to a device that encodes a still image for audio and digitally records and reproduces it. In the case of a still image, one screen is divided into several tracks or several hundred tracks and recorded. For convenience of search, the title or number of a still image is recorded in each track as an ID word in a predetermined area.

[Problems to be Solved by the Invention] Such an ID word enables high-speed search. However, it was impossible to quickly search the recorded still image itself. In the case of high-speed reproduction, a plurality of tracks for recording data of one image are partially reproduced, and a considerable part of the image data is lost. Therefore, it was not possible to obtain a reproduced image that could be watched.

SUMMARY OF THE INVENTION An object of the present invention is to provide a recording device capable of obtaining a good high-speed reproduction function.

[Means for Solving the Problems] A recording apparatus according to the present invention comprises an input unit for inputting an image signal, and a first unit for encoding an image signal input by the input unit to generate an image signal for normal reproduction. Generating means, and second generating means for encoding an image signal input by the input means to generate an image signal for high-speed reproduction,
A plurality of helical tracks are formed on a tape-shaped recording medium by a rotating head, and each helical track is divided into a plurality of areas, and the image signal for normal reproduction is recorded in a first predetermined area of the plurality of helical tracks. Recording means for recording the image signal for high-speed reproduction in a second predetermined area; dividing one screen of the image signal for high-speed reproduction into a plurality of portions; Each of the helical tracks is recorded in the second predetermined area, and a predetermined number of the helical tracks are formed with respect to the high-speed reproduction image signals of the respective portions. Control means for controlling the recording means so as to record the image signals for each predetermined number of times.

[Operation] By means of the above-described means, for example, when a still image is recorded, all or most of the image data constituting one image with low image quality can be reproduced from the second area. Therefore, high-speed reproduction can be realized.

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

First, a track pattern of a magnetic tape and recorded contents in a track in this embodiment will be described. FIG. 2 shows a track pattern of a magnetic tape as a recording medium.
As shown in FIG. 2, in the present embodiment, A,
Two areas B are provided, an image signal is digitally recorded in the area A as usual, and image information for high-speed reproduction is digitally recorded in the area B. The G area is a guard band. In this embodiment, track numbers # 1, # 2, #
Use n tracks of 3,..., #N.

FIG. 3 shows the configuration of track # 1 of screen number i. A
The synchronization signal, ID and block address, parity, data part, and error detection and correction code (EC
C), a part of the data of the screen number i is recorded in the data part of the area A, while the data part of the area B is
A plurality of sets (eight sets in the illustrated example) of data obtained by partially thinning out image information recorded in the data portion of the A area are recorded.

FIG. 1 is a block diagram showing a configuration of a recording system according to an embodiment of the present invention. 10 is an image output circuit that outputs an image signal like an image sensor, 12 and 16 are A / D converters that digitize the luminance signal Y output from the image output circuit 10, and 14 and 18 are from the image output circuit 10. A / D for digitizing output color signals I and Q
It is a converter. However, the sampling frequency and the number of bits per sampling of the A / D converters 12 and 14 are set so that normal image quality can be obtained.
The sampling frequency of 18 and the number of bits per sampling are set lower than those of the A / D converters 12 and 14.

20 is a memory for storing output data of the A / D converters 12 and 14,
22 is a memory for storing output data of the A / D converters 16 and 18;
Is an encoder that encodes data stored in the memory 20 to form a signal to be recorded in the A area, 26 is an encoder that encodes data stored in the memory 22 to form a signal to be recorded in the B area, and 28 is an encoder that encodes data stored in the B area. Switches for serializing the output, 30 and 32 are magnetic heads mounted on a rotating drum (not shown) 180 ° opposite each other, 34 is a magnetic tape, and 36 is a system control circuit for controlling the whole.

The operation of FIG. 1 will be described. The A / D converters 12 and 14 sample the luminance signal Y and the color signals I and Q output from the image output circuit 10 at a normal sampling frequency and digitize the data, and the output data is stored in the memory 20. The encoder 24 serially outputs the data stored in the memory 20 to the switch 28 in a format as shown in FIG. 3A for each data to be recorded on each track.

On the other hand, the A / D converters 16 and 18 sample the luminance signal Y and the chrominance signals I and Q output from the image output circuit 10 at a lower sampling frequency than the A / D converters 12 and 14, and at a lower bit number. Digitize. Therefore, the image data output from the A / D converters 16 and 18 is thinned out, and the A / D converters 12 and
Less than 14 output data numbers. Output data of the A / D converters 16 and 18 are stored in the memory 22. Encoder 26 is memory 22
Is stored in the third track for each data to be recorded on each track.
The data is serially output to the switch 28 in a format as shown in FIG.

The switch 28 is connected to the a contact in the area A shown in FIG.
Connect to contact b in region B. The output of the switch 28 is recorded on the magnetic tape 34 by the magnetic heads 30 and 32. That is, normal-quality image data is recorded in the area A on the same head scan line of the helical scan, and a plurality of sets (eight sets in the illustrated example) of low-quality image data for high-speed reproduction are recorded in the area B. .

FIG. 4 is a block diagram showing the configuration of the reproducing system with respect to FIG. 40 is a magnetic tape on which a still image is recorded in a track format as shown in FIG. 2, 42 and 44 are magnetic heads, 46 is a waveform equalizing circuit, 48 is reproduction data from the A area and reproduction from the B area. Switch for separating data, 50 is A
A decoder for decoding the reproduced data from the area; 52, a decoder for decoding the reproduced data from the B area; 54, 56, memories for storing the decoded data from the decoders 50, 52;
8, 60 are D / A converters for converting luminance data and color data stored in the memory 54 into analog signals, and 60, 62 are D / A converters for converting luminance data and color data stored in the memory 56 into analog signals. A converter, 66 is an image output processing circuit for forming a video signal from the output of the D / A converters 58, 60, 68 is a D / A converter 62,
An image output processing circuit that forms a video signal from 64 outputs,
70 is a switch for selecting the output of the image processing circuits 66 and 68, 72
Is an output terminal for a reproduced image signal, and 74 is a system control circuit for controlling the whole.

The operation of FIG. 4 for normal reproduction will be described. The magnetic heads 42 and 44 move along the tracks of the magnetic tape 40, and the recording signals on the magnetic tape 40 are reproduced by the magnetic heads 42 and 44 and equalized to the optimum waveform by the waveform equalizing circuit 46. The signal in the area A of the output of the waveform equalizing circuit 46 is applied to the decoder 50 via the switch 48. The decoder 50 performs synchronization detection, error correction, and the like, and supplies reproduced data to the memory 54. By playing tracks # 1 to #n,
Image data for one screen is stored in the memory 54. memory
The data stored in 54 is then read out, converted to analog signals by D / A converters 58 and 60, and converted to standard video signals by image output processing circuit 66. During normal reproduction, the switch 70 is connected to the contact a, and the reproduced image signal output from the image output processing circuit 66 is supplied to the switch 70 and the output terminal 72.
Is supplied to an external monitor device (not shown) via the

Since the reproduction signal from the area B is not used during the normal reproduction, the decoder 52, the memory 56, and the D / A converters 62 and 64 are preferably set to a rest state from the viewpoint of power saving.

Next, the operation during high-speed reproduction will be described. During high-speed playback,
Since the running speed of the magnetic tape is faster than during recording, only a part of the recorded image data needs to be read. However, as shown in FIG. 3 (2), in this embodiment, eight sets of the same data are recorded in the B area of one track, so that when the magnetic head crosses obliquely, it is 1/8 or more of the track. , The recorded data in the area B of this track can be reproduced.

The reproduction outputs of the magnetic heads 42 and 44 are equalized by a waveform equalization circuit 46 to an optimum waveform. The signal in the B region of the output of the waveform equalizing circuit 46 is applied to the decoder 52 via the switch 48. The decoder 52 performs synchronization detection, error correction, and the like, and the decoded data is stored in the corresponding location of the memory 56 according to the block address. If the vehicle travels to tracks # 1 to #n and at least 1/8 or more of the data is reproduced from each track, the image data of one screen is stored in the memory 56 although the image quality is low. The data stored in the memory 56 is thereafter read, converted into analog signals by the D / A converters 62 and 64, and converted into standard video signals by the image output processing circuit 68. During high-speed playback, the switch 70 is connected to the contact b, and a playback image signal output from the image output processing circuit 68 is supplied to an external monitor device (not shown) via the switch 70 and the output terminal 72.

At the time of high-speed reproduction, since the magnetic heads 42 and 44 scan the track diagonally, for example, for the image of the screen number i, part of the image data of the screen number i-1 and the screen number i + 1,
Although stored in the memory 56, in the memory 56, the decoder 52
From the playback data sequentially supplied from the server.

A search is performed while looking at the monitor screen, and when a desired image is found, the tape running is stopped by a switch (not shown) or the like, and the image output when the switch or the like is operated is recorded in the Y position. The magnetic tape is rewound, and the recording signal is normally reproduced in the area A of the tracks # 1 to #n. Thereby, a desired image can be reproduced and displayed with normal image quality.

In the above embodiment, a plurality of sets of the same data are recorded in the B area of one track. For example, as shown in FIG. The data may be recorded, and the same data may be recorded in Bi2 to Bi8. That is, even if all the data recorded in one group of the B area are made the same with eight tracks as one group, a high-speed reproduction image can be obtained from the data of the B area.

In recent years, a non-tracking method that does not perform tracking control during reproduction has been proposed. This means that during playback, the rotating head is rotated at twice the speed of recording,
There is a method in which a recording signal is read repeatedly to obtain complete reproduction data in a memory. The present embodiment is also effective for such a system, and can realize high-speed reproduction in which the magnetic tape runs at a speed higher than the tape speed at the time of recording.

[Effects of the Invention] As can be easily understood from the above description, according to the present invention, since the image signal for normal reproduction and the image signal for high-speed reproduction are recorded on the tape-shaped recording medium, the image quality is low. It is possible to realize high-speed reproduction that can sufficiently withstand viewing.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of a recording system according to an embodiment of the present invention,
FIG. 2 is a track pattern of a magnetic tape, FIG. 3 is a recording configuration of track # 1 of screen number i, FIG. 4 is a block diagram of a reproducing system, and FIG. This is an area change recording configuration. 10: Image output circuit, 12, 14, 16, 18: A / D converter, 20, 22: Memory, 24, 26: Encoder, 28: Switch, 30, 32: Magnetic head, 34: Magnetic tape, 36: System control circuit, 40: magnetic tape, 42, 44: magnetic head, 46: waveform equalization circuit, 48: switch, 50, 52: decoder, 54, 56: memory, 58, 60, 60, 62: D / A
Converter, 66, 68: Image output processing circuit, 70: Switch, 72: Output terminal, 74: System control circuit

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 5/008 G11B 20/12 G11B 27/00

Claims (1)

(57) [Claims] An input unit for inputting an image signal; a first generation unit for encoding an image signal input by the input unit to generate an image signal for normal reproduction; and an input unit for inputting the image signal. Second generating means for generating an image signal for high-speed reproduction by encoding the image signal; forming a plurality of helical tracks on a tape-shaped recording medium by a rotary head and dividing each helical track into a plurality of areas; Recording means for recording the image signal for normal reproduction in a first predetermined area of the plurality of helical tracks, and recording the image signal for high-speed reproduction in a second predetermined area; and the image signal for high-speed reproduction. Is divided into a plurality of parts, and the image signals for high-speed reproduction of each part are respectively recorded in the second predetermined area of one helical track, and the high-speed reproduction of each part is performed. Control means for controlling the recording means so as to form a predetermined number of the helical tracks with respect to the image signals for reproduction and to record the image signals for high-speed reproduction of the respective parts a predetermined number of times, respectively. A recording device characterized by the above-mentioned.