JPH09298717A - Magnetic recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reproduce a video image with high time resolution. SOLUTION: When an operation key 14 is used to designate the N multiple (high speed) image pickup mode, a sub code control microcomputer 22 generates recording information denoting the recording mode. The recording information is given to an error correction circuit 20 with a video signal and a prescribed track configuration is built up and the result is recorded on a magnetic tape 28. When the operation key 14 is used to designate the reproduction mode, the sub code control microcomputer 22 extracts recording information from the reproduction signal. When the recording information is discriminated to be a high speed image pickup mode, a video processing circuit 18 conducts reproduction processing corresponding to the high speed image pickup mode. Then video signals of N-fields are outputted while being shifted one by one field from a memory 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus, and is particularly applied to, for example, a digital VCR and converts a video signal taken at a normal N times magnification into first to Nth video signals for 1 / N screen. The present invention relates to a magnetic recording / reproducing apparatus for recording video signals for N fields on a magnetic tape in one field period.

[0002]

2. Description of the Related Art An example of a data conversion device as the background of the present invention is disclosed in Japanese Patent Application No. 6-2 filed on October 7, 1994.
No. 43565. In this technique, a frame memory (bitmap memory) capable of recording video data for one monitor screen is provided, and this frame memory is the first
A write address is generated so as to be divided into the Nth area. Then, the first to Nth video data (charges) corresponding to 1 / N screen portion of the video signal read out from the CCD during one frame period are divided into the first of the divided frame memories.
To the Nth area, and the video data is sequentially read from the frame memory according to the read address signal from the shuffling address generation circuit.

[0003]

However, there is no disclosure of a method for reproducing video data shot at N times speed (mode), and in order to effectively reproduce the video data, the video data must be reproduced. It is necessary to understand how the data was recorded on the magnetic tape and take appropriate measures. In other words, if the video data recorded in the frame memory by high-speed shooting is reproduced as it is, the 1st to Nth video data corresponding to 1 / N screens are simultaneously multi-displayed in one frame period. At a normal shooting speed (1/60 seconds) such as a golf swing, it was impossible to continuously view an invisible image with increased resolution.

Therefore, a main object of the present invention is to provide a magnetic recording / reproducing apparatus capable of reproducing video data captured at high speed with high resolution.

[0005]

According to the present invention, there is provided a frame memory capable of recording a video signal for one screen of a monitor, and the 1st to Nth screens for 1 / N screens taken at a speed N times as fast as a normal one. A magnetic recording / reproducing apparatus for sequentially storing video signals in first to Nth areas of a frame memory and recording the N field video signals read from the frame memory in a recording medium during one field period. A recording unit that writes recording information indicating how the recording is performed on the recording medium, and the recording information is read from the recording medium that runs at a speed of 1 / (N × M) that is normal, and N fields are read according to the recording information. The magnetic recording / reproducing apparatus is provided with reproducing means for outputting the video signal of 1 field for each M field period.

[0006]

At the time of recording, recording information indicating how the captured video signal is recorded on the recording medium is recorded on the recording medium by the writing means. For example, the recording medium has an optional area for each track, and, for example, shooting speed information as recording information is recorded in this optional area. Then, at the time of reproduction, the recording information is read from the recording medium by the magnetic head, and the video signal is output at the timing corresponding to the recording information. That is, the recording information recorded in the optional area is read, and it is recognized from the recording information that the video signal recorded on the recording medium is obtained by high-speed shooting (N-speed shooting). Then, the N-field video signal read by the magnetic head is output by the reproducing means one field at a time for every M-field period.

[0007]

As described above, according to the present invention, since the reproduction process is performed according to the recording information recorded on the recording medium together with the video signal, it is possible to obtain a video with high resolution.
The above-mentioned objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of the embodiments with reference to the drawings.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a magnetic recording / reproducing apparatus 10 of this embodiment is applied to, for example, a digital VCR movie and includes a syscon microcomputer 12. The syscon microcomputer 12 records the input video signal from the camera 16 on the magnetic tape 28 or reproduces the input video signal recorded in accordance with the key input signal from the operation key 14.

That is, for example, when the N-fold speed imaging mode for recording at the normal N times is designated by the operation keys 14, the syscon microcomputer 12 receives a key input signal from the operation keys 14 and includes a CCD (not shown). Camera 16
, A command signal corresponding to the designated mode is output. As a result, in the input video signal, the image charge is read from the CCD in the camera 16 in accordance with the charge read pulse which is output once in the 1 / N field, for example.

The read image charge is, for example, 1/2
Video charges for one line are transferred in the vertical direction every 1 / 2H in accordance with a vertical transfer pulse that is output once for H and 240 for 1 / N field. This image charge is
Data is transferred in the horizontal direction according to a horizontal transfer pulse once in the same 1H period as in the normal mode. Therefore, when the image charges in the first half of one line have been transferred and the image charges in the second half still remain, the image charges of the next line will be transferred from the vertical transfer CCD (not shown). 1
The image charges in the latter half of one line are swept out by the unnecessary charge sweeping pulse output in 240 / N fields. Therefore, from the CCD (not shown), only the image charges in the first half of one line are output. When the image charges for 1 / N field have been transferred, 240 remaining vertical transfer pulses and unnecessary charge sweep pulses cause the remaining 2
The image charges for 40 lines are swept out. This allows
A CCD (not shown) outputs image charges for 1 / N screen.

The video signal (charge) output from the CCD is applied to the video processing circuit 18, where it is written at a designated address in accordance with a predetermined write address signal. That is, the image processing circuit 18 includes a frame memory 19 capable of storing an image for one screen of the monitor, and the write address signal for dividing the frame memory 19 into the first to Nth areas corresponds to the 1 / N screen. The first to Nth (for one frame) video signals are written in the frame memory 19. The written video signal is then read from the frame memory 19 according to a predetermined read address signal. That is, the frame memory 19 outputs a video signal obtained by converting information for N fields into one field period, as described in Japanese Patent Application No. 6-243565. This video signal is subjected to signal processing in the video processing circuit 18 in the same manner as in a normal camera, and given to the error correction circuit 20.

The syscon microcomputer 12 outputs a command signal corresponding to the key input information to the subcode control microcomputer 22. As a result, the subcode control microcomputer 2
2 produces | generates the imaging speed information as recording information according to the command signal, and records this recording information in the predetermined area of the magnetic tape 28. That is, as shown in FIG. 2, the magnetic tape 28 is composed of a subcode sector, a video sector, an audio sector and an ITI sector, and a video signal and an audio signal are recorded in the video sector and the audio sector, respectively. The recording information generated by the subcode control microcomputer 22 is recorded in the subcode sector of the magnetic tape 28.

The subcode sectors are constructed as shown in FIGS. 3 and 4, and each subcode sector has an I
D data and subcode data are recorded. As you can see from the figure, 0SYNC BL of subcode data
OCK to 2SYNC BLOCK and 6SYNC B
An optional area is formed in LOCK to 8 SYNC BLOCK. And, for example, 0SYNC B
The manufacturer code pack shown in FIG. 5 is recorded in LOCK.

The manufacturer code pack (optional area) is, for example, a pack data PC as shown in FIG.
It consists of 5 bytes from 0 to PC4 and pack data PC0
Is written with item data (header), and the formats of PC1 to PC4 that follow the item data are set. Manufacturer code pack pack data PC1
The manufacturer's ID is written in, and by this value,
Subsequent contents can be specified for each manufacturer.
The TDP in the manufacturer code pack indicates the total number of related packs after this pack. Pack data P
In C4, shooting speed information as recorded information is recorded,
For example, when the quadruple speed high-speed imaging mode is designated by the operation key 14, "AAH", which indicates that the information of four fields is thinned and recorded in one field period, is recorded in the pack data PC4.

The maker code pack generated by the sub-code control microcomputer 22 is applied to the error correction circuit 20 and is constructed in the track configuration shown in FIG. 2 together with the input video signal which is signal processed by the video processing circuit 18.
Then, the manufacturer code pack (recording information) and the input video signal are recorded on the magnetic tape 28 by the magnetic head 30 via the modulation / demodulation circuit 24 and the head amplifier circuit 26.

On the other hand, when the slow reproduction mode is designated by the operation keys 14, the syscon microcomputer 12 drives the magnetic tape 28 at a speed according to the designated mode.
As a result, the video signal and the recording information are read from the magnetic tape 28. The read signal is given to the syscon microcomputer 12 via the head amplifier circuit 26, the modulation / demodulation circuit 24, and the error correction circuit 20.

The syscon microcomputer 12 outputs this reproduction signal to the subcode control microcomputer 22.
The subcode control microcomputer 22 extracts subcode data including record information from the reproduction signal. Then, the manufacturer code recorded in the manufacturer code pack shown in FIG. 5 is discriminated, and if the manufacturer code recorded in the pack data PC1 is that of its own, then the pack data P
The C4 is analyzed to detect the record information indicating how the reproduced signal is recorded on the magnetic tape 28. That is, when the pack data PC4 = AAH, the sub-code control microcomputer 22 determines that the reproduction signal is a signal recorded in the quadruple speed (high speed) imaging mode.

Then, according to the result of this determination, the syscon microcomputer 12 outputs a command signal for setting the video processing circuit 18 to the reproduction processing mode corresponding to the high-speed imaging mode.
As a result, the reproduction signal provided to the video processing circuit 18 is written into the memory according to the predetermined write address signal, and read from the memory according to the predetermined read address signal.

That is, the video processing circuit 18 includes a memory 32 composed of, for example, eight addresses (addresses 0 to 7), and the video signal from the error correction circuit 20 is stored in the memory 32 as shown in FIG. , Regularly recorded. That is, the syscon microcomputer 12 generates a write address signal for instructing writing to the memory 32, and the video signal is written to the memory 32 in accordance with this write address signal. The video signal written according to the write address signal is read from the memory 30 according to the read address signal generated by the syscon microcomputer 12. In this embodiment, 0 or 4 is designated as the write address, and 0 to 7 are designated as the read address.

Further, the error correction circuit 20 outputs a FEND signal indicating that a video signal for 10 tracks corresponding to one frame has been fetched, and detects a period for fetching a video signal for one frame. And
Video signals of two fields forming one frame are switched at an appropriate timing. That is, for example, when the 1/4 slow reproduction mode is designated, as can be seen from FIG. 6, the error correction circuit 20 outputs the first half field of the four field period, and subsequently outputs the second half field of the four field period. It

More specifically, the error correction circuit 2
When the FEND signal is output from 0, the error correction circuit 20 outputs the first half field video signal to the video processing circuit 18 at the rising edge of the frame pulse (FRM signal). Then, the video signal of the first half field is stored in the memory 32 by the write instruction signal (TA) from the syscon microcomputer 12. Then, for example, the video signal of the first half field is recorded in the addresses 4 to 7 by the write address signal, and at the same time, the video signal of the second half field of the previous frame is recorded in the addresses 4 to 7 by the read address signal. The address of is read. That is, the next FRM when the FEND signal rises
Write address 4 and read address 0 are designated in synchronization with the rising edge of the signal. Then, the read address 2 is designated in synchronization with the next rising edge of the FRM signal. At this time, writing to the memory 32 is not performed.

When the video signal of the latter half field is output from the error correction circuit 20, the write address 0 is similarly output.
And the read address 4 is designated, and the video signal of the latter half field is recorded in the memory 32. Then, the read address 6 is designated in synchronization with the next rising edge of the FRM signal,
The video signal of the first half field is read. At this time, writing to the memory 32 is not performed.

Therefore, from the video processing circuit 18, 4
(N) The video signals of four fields (four screens) recorded in the double speed imaging mode are output one field (one screen) every one field period. In addition, syscon microcomputer 1
Reference numeral 2 includes a counter 34, and the counter 34 is incremented in synchronization with the next rise of the FRM signal after the rise of the FEND signal. The read address of the memory 32 is designated according to the count value of the counter 34.

The operation of the syscon microcomputer 12 and the sub-code control microcomputer 22 described above will be described with reference to the flowchart of FIG. 7. The syscon microcomputer 12 causes the reproduction mode designated by the operation key 14 to be slow reproduction in step S1. Determine if it is in mode. Then, when it is confirmed that the slow reproduction mode is set, the sub-code control microcomputer 22 extracts the sub-code data from the reproduction signal in step S3, and in the subsequent step S5, determines whether or not the extracted manufacturer code is the own code. . That is, as described above, the pack data PC1 = 10010 of the manufacturer code pack shown in FIG.
It is determined whether it is 111. This code is the manufacturer code of Sanyo Electric Co., Ltd.

In step S5, pack data PC
If it is recognized that the manufacturer code written in 1 is the company code, the pack data PC4 of the manufacturer code pack is read in step S7, and it is determined whether the code is "AAH". That is, it is determined whether or not the stored information recorded in the pack data PC4 is a code indicating that the information of four fields is thinned out and recorded in one field period (in the 4 × speed imaging mode), and “YES”. For example, in the subsequent step S9, the syscon microcomputer 12 outputs a signal designating the ¼ slow reproduction mode to the video processing circuit 18. As a result, the reproduction signal given to the video processing circuit 18 changes according to the read address signal described above with reference to FIG.
It is output from the video processing circuit 18.

In the following step S11, it is determined whether the FEND signal output from the error correction circuit 20 is a UP edge. If "YES", the read address is read in step S13 in synchronization with the rising edge of the FRM signal. Is designated as 0 and the write address is designated as 4, and the counter 34 is incremented. That is, at the rising edge of the next frame pulse (FRM signal) after the rising edge of the FEND signal, the video signal of the first half field is stored in the memories 4 to 4.
7, the video signals of the latter half field of the previous frame are sequentially read from the memories 0 to 3.

When it is determined in step S11 that the FEND signal is not the UP edge, it is determined in step S15 whether the count value of the counter 34 is 1, and if "YES", the read address is read in step S17. The counter 34 is incremented while being designated as 2. Further, in step S15, the counter 34
If the count value of is not 1, the following step S19
, It is judged whether the count value is 2 and "Y
If "ES", the read address is 4 in step S21.
A write address of 0 is designated. On the other hand, if the count value of the counter 34 is not 2, in step S23,
The read address is designated as 6.

The processing of steps S11 to S23 described above
The process is repeated until "NO" is determined in step S7. Also, with the operation key 14,
Similarly, when the / 16 slow reproduction mode is designated, timing control is performed in accordance with the read address and the write address shown in FIG. 8 to reproduce a video signal with further improved time resolution. That is, the video processing circuit 1
From 8, the video signals of 4 (N) fields (4 screens) recorded in the 4 × speed imaging mode are output one field (1 screen) every 4 (M) field periods.

In the 1/16 intermittent slow playback mode, since it is difficult to switch the first half field and the second half field by the video processing circuit 18, the syscon microcomputer 12 generates the FLUSH signal shown in FIG. By inverting the FEND signal at the rising edge of the FLUSH signal, the video signals of the first half field and the second half field can be switched and output.

As described above, since the photographing speed information as the recording information is recorded in the optional area of the magnetic tape and the reproducing process according to the recorded information is performed, the sports scene etc. recorded in the high speed imaging mode can be recorded. It is possible to output a quick motion as a continuous image for each field, and obtain an image with high time resolution. In addition,
In the above-described embodiment, in step S1 of FIG. 7, it is determined whether or not the slow reproduction mode is set, and if “NO”, the process is ended, but even if the normal reproduction mode is designated. It is very convenient if the traveling speed of the magnetic tape 28 is regulated according to the recording information read from the magnetic tape 28. In addition, the error correction circuit 2
The circuit can be simplified by inputting the reproduced video signal from 0 to the frame memory 19 which is not used during reproduction, instead of the memory 32, and performing the above-mentioned writing and reading there.

[Brief description of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is an illustrative view showing a tape format of a video tape.

FIG. 3 is an illustrative view showing a structure of ID data / subcode data.

FIG. 4 is an illustrative view showing a structure of ID data / subcode data.

FIG. 5 is an illustrative view showing a maker code pack.

FIG. 6 is a timing chart showing a part of the operation at the time of reproducing the video signal recorded in the quadruple speed (high speed) imaging mode in the ¼ slow reproduction mode in the embodiment of FIG. 1;

FIG. 7 is a flowchart showing a part of the operation of the embodiment in FIG. 1;

FIG. 8 is a timing chart showing a part of the operation when reproducing the video signal recorded in the quadruple speed (high speed) imaging mode in the 1/16 slow reproduction mode in the embodiment of FIG. 1;

[Explanation of symbols]

 10 ... Magnetic recording / reproducing device 12 ... Syscon microcomputer 16 ... Subcode control microcomputer 18 ... Camera 20 ... Image processing circuit 22 ... Error correction circuit 28 ... Magnetic tape 32 ... Memory 34 ... Counter

Claims (5)

[Claims] 1. A frame memory capable of recording a video signal for one screen of a monitor, which is taken at a speed N times as high as a normal speed.
First to Nth video signals for N screens are sequentially stored in the first to Nth areas of the frame memory, and the N field video signals read from the frame memory are recorded on a recording medium in one field period. A magnetic recording / reproducing apparatus for writing, to the recording medium, recording information indicating how the video signal was recorded on the recording medium, and running at a speed of 1 / (N × M) of a normal speed. The recording information is read from the recording medium, and N
A magnetic recording / reproducing apparatus comprising reproducing means for outputting the field video signal for each field every M field periods. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the recording medium has an optional area for each track, and the recording information is recorded in the optional area. 3. The reproducing means includes writing means for writing the video signal of N fields into a memory for each predetermined field, and reading means for reading the video signal written in the memory for every M fields. Claim 1 or 2
The magnetic recording and reproducing apparatus according to claim 1. 4. The magnetic recording / reproducing apparatus according to claim 1, further comprising a driving unit that defines a traveling speed of the recording medium according to the recording information read by the reproducing unit. 5. The magnetic recording / reproducing apparatus according to claim 1, wherein the recording information includes at least photographing speed information.