JPH09231688A - Recording and reproducing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a simple VTR system by enabling all data to be read out at a speed n-times as high as the recording time and yet enabling reproduction at the same speed as the recording time. SOLUTION: Signals of heads opposite to one another at 180 deg. are amplified by their respective amplifiers 12, and are then alternately changed by a head switch signal to be led to a reproducing demodulation circuit 13. A recorded data of each track as the digital data demodulated by the reproducing demodulation circuit 13 has a data rate which is slightly different from but almost the same as the recording time, and is outputted individually in parallel into a 4-channel system to be stored once in a memory circuit 14. In order to expand and decode the compressed data, if, for instance, 10 tracks constitute 1 frame, every 10 tracks in the lump are inputted to expanding and decoding circuits 15. Then, for the purpose of rearranging the data stored in the memory circuit in order of the original tracks in turn, a memory read-out signal from a memory control circuit 16 is controlled to read out the memory to separate picture decoding circuits in a unit of 10 tracks in order of the original tracks at a data rate for the usual reproducing time.

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 more particularly to the technical field of a recording / reproducing system in which a recording data rate and a reproducing data rate are different from each other.

[0002]

2. Description of the Related Art Generally, the recording and reproducing data rates of a conventional magnetic recording and reproducing apparatus are the same. In both a cassette tape for recording audio and a VTR for recording video, the recording signal and the reproducing signal are recorded and reproduced at the same frequency.

For example, in fast-forward reproduction of video data found in the current VTR, not all the recorded data is reproduced, but only a reproducible portion of a plurality of images (a plurality of frames) is reproduced and combined to shorten the recording time. The user is watching the reproduced image that is partially missing within the specified time, and not all the recorded data is reproduced at high speed.

However, as a tape (soft tape) already recorded with an audio tape, a so-called high-speed dubbed tape that records at a relative speed between the head and the tape at the time of recording is increased from that at the time of reproduction, and a cylinder rotation at the time of reproduction is 2 There is a helical scan type magnetic recording / reproducing apparatus which rotates at a high speed twice to double the tape feeding speed and reproduces at a high speed in a frequency band twice as high as that at the time of recording.

[0005]

Generally, in order to perform high-speed reproduction with a VTR, the tape feeding speed is increased as compared with that during recording. Therefore, the tape pattern recorded at normal speed and the reproducing head are recorded. The running trajectory will be different.

Therefore, technically, by multiplying the number of rotations of the rotary cylinder on which the head is mounted by n times and the tape feeding speed by n times, it is possible to obtain the locus of the reproducing head that matches the recording pattern. It is possible to play back at n times speed,
If the signal band of the reproduction system becomes n times as much as it becomes twice or more,
In terms of mechanism, the relative speed becomes n times, and good contact between the head tapes cannot be obtained. Therefore, the circuit system becomes complicated to cope with normal recording and high speed reproduction, and a good SNR is obtained.
There were many issues without getting

[0007] Also, from the beginning, a reproducing head having n times the number of heads required for normal reproduction is mounted, and n times as many heads are used during high-speed reproduction to collectively reproduce n tracks per cylinder revolution. Then, although there is no circuit problem regarding the signal band, since the scanning locus of the reproducing head is different from the recording pattern, it is necessary to add a reproducing head having a reproducing track width sufficiently wider than the track pitch or n times more reproducing heads. Therefore, there is a problem that each reproduction channel has to be switched and reproduced.

Further, there is a method of collectively reproducing a plurality of tracks by a large number of heads, and in order to match a scanning locus of the reproducing head with a recording pattern, there is a method of displacing the head by a piezoelectric element or the like in response to a rotation cycle. However, the VTR having such a structure requires a very complicated mechanism design and a highly accurate control technique, and thus has a problem that the product becomes expensive.

Further, such a reproducing apparatus is also required to perform standard reproduction at normal speed, and there is a restriction that both high speed reproduction and normal reproduction must be performed.

[0010]

In order to solve this problem, recording data recorded on a magnetic tape at a first recording rate, which is a reference in a first magnetic recording device, and n times the recording rate. And a second magnetic recording / reproducing device for reproducing at a second reproducing rate
The number of reproducing heads of the second recording / reproducing apparatus is n times the number of recording heads of the first apparatus, and the angle of the tape running guide of the rotary cylinder part mounting the head is the same as the angle of the recording pattern. Angle correction is performed so that the number of rotations of the rotary cylinder is the same, the tape feeding speed is n times, and all the data is reproduced in 1 / n time as compared with the time of recording.

Further, as an expansion of the function of the high-speed reproducing device, when reproducing by the second magnetic recording / reproducing device at the same speed as the first recording rate, one recording track is reproduced n times as much as the recording head. Use all or part of the head,
It is preferable to reproduce by dividing into n times as many reproduction channels as at the time of recording and re-arrange the reproduced data to restore the original recorded data.

At that time, as a method for reproducing by dividing into n times as many heads, depending on the size of the reproduction output envelope of the reproduction head, only the output of a specific reproduction head is selected and the original data is reproduced. The playback method to be restored or the sync signal (sync data) for each data block added to the recorded digital data is restored, and the output of the specific playback head is performed in data block units based on the relationship with the cylinder rotation phase. A method of selecting data and then rearranging the data to restore the original data, or decoding the error correction code added to the recorded digital data of the recorded data reproduced by each head, Standard playback characterized by selecting the output data of a specific playback head in error correction block units based on the error rate and restoring it to the original data Also play divided into n times of the reproducing head in either system of formula, yet fast player by rearranging enables normal reproduction, it is possible to achieve expansion of functions of the device itself.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A detailed description will be given below of an embodiment of the present invention.

An example of a home digital video in which images and sounds are converted into digital signals and recorded and reproduced as digital data on a magnetic tape will be described.

The VTR format is a standard approved by the HD Digital VCR Council established in September 1993. The outline is that the video data is 25 Mbps and the audio 2
The channel is a format that is compressed to 1.5 Mbps and recorded on a tape 2 having a width of 1/4 inch with a track pitch of 10 μm and 10 tracks per frame.

As shown in FIGS. 2 and 3, the mechanism of the VTR is such that a pair of pair heads 0 and 1 having different azimuths of 180 degrees are arranged in a rotating cylinder having a diameter of 21.7 mm and the cylinder is arranged at 9000 minutes per minute. Rotate, 18 every half turn
Recording is performed by alternately switching the heads facing 0 degree.

In the signal processing of the recording system, the image information is converted into digital data, and the encoding circuit 3 correlates the images on a frame-by-frame basis to perform compression encoding of the data amount and control the signal amount to image data of a constant rate. To do. The compressed data is recorded and modulated, and the signal amplified by the recording amplifier is recorded on the tape by the magnetic head.

In the normal reproducing process, the recording head performs so-called self-recording / reproducing in which the recording head plays the role of a reproducing head in the same structure as in the recording process, and scans the recording pattern to read the recorded data. Processing (hereinafter, decoding processing) is performed to restore the original image information. At this time, error correction is performed for each sync block unit and track unit for erroneous data in the process of reproducing from the magnetic tape. Further, the data of the sync block that cannot be completely corrected in frame units is complemented / corrected by the data of the same block number of the immediately preceding frame.

Incidentally, the tape feeding speed 5 in the standard reproduction is 18.8 mm / sec. Further, the track angle 6 on the tape pattern is 9.17 degrees, which is the angle (still angle) when the tape does not run, and the cylinder lead angle 7 is 9.15.
Degrees.

Assume a high-speed reproduction, which is the main object of the present invention, for example, a quadruple-speed reproducing device for reproducing all data at a quadruple speed.

The number of reproducing heads is as shown in FIG.
4 times 8 heads L1, R1, L2, R2, L3, R3
Equipped with L4 and R4, batch playback of 4 tracks. As shown in (b), the respective heads are arranged with respect to the rotary cylinder 9 every 90 degrees, and the position of the head (head height) with respect to the rotating surface is shown in FIG. L, R
The distinction will be described in correspondence with the azimuth angle in the azimuth recording. As an application, there is an example in which a VTR is transferred to a memory device such as a hard disk (a storage device that can be randomly accessed) in a short time, and a recording tape is edited on the random access memory.

When reproducing at a speed of 4 times, the tape feeding speed at the time of reproduction becomes 4 times, that is, 75.2 mm / sec, and if the lead angle of the cylinder is the same as the recording VTR, the rotation speed of the cylinder is constant. Then, the track angle 6 scanned by the reproducing head becomes 9.22 degrees, and the track angle shifts. As a result, the reproducing head does not scan the recording pattern.

For this purpose, the lead angle 7 of the cylinder is set to 0.0.
Change it to 9.10 after correcting it by 5 degrees. When the track angle is set to 9.10 degrees, the track angle 6 becomes 9.17 degrees, and the locus of the head on the reproducing cylinder of the 4 × speed reproducing machine correctly scans the recording pattern when the tape is run at 4 times speed.

Therefore, four pairs of heads are mounted on the cylinder whose lead angle 7 is changed, and the height of each head corresponds to the mounting position of the cylinder.
If it is set to 0, it is possible to collectively reproduce 8 tracks for each rotation of the cylinder.

At this time, the heads are arranged on the rotary cylinder as shown in FIG. 4, in which two pair heads are symmetrically arranged at every 90 degrees of the cylinder, and the relative height 10 of the two pair heads has a relation. It is 8.6 μm, which is obtained by correcting the relative positional relationship 11 of the pair head from the track pitch.

The outputs reproduced from the four pairs of heads are subjected to signal processing in the reproducing process by the reproducing circuit shown in FIG. That is, the heads facing 180 degrees are amplified by the amplifier 12, then alternately switched by the head switch signal, and guided to the reproduction / demodulation circuit 13. The recording data for each track demodulated into digital data by the reproducing / demodulating circuit 13 has a data rate slightly different from that at the time of recording (a change in the relative speed of the tape head due to a change in the tape feed speed), but is substantially the same. The four lines are output in parallel and temporarily stored in the memory circuit 14.

In order to decompress and decode compressed data, it is necessary to carry out batch processing in units of specific data blocks. For that purpose, in the case of the present embodiment, since one frame is composed of 10 tracks, it is necessary to collectively input every 10 tracks to the decompression decoding circuit 15.

Therefore, in order to rearrange the data stored in the memory circuit in the order of the original tracks, the memory read signal from the memory control circuit 16 is controlled so that the original image decoding circuits are divided into 10-track units. Reads in track order at the normal playback data rate. Switching of heads and rearrangement and reading of reproduced data are performed by the VTR system control 17 at appropriate times.

The four systems of image decoding circuits sequentially output the image data of four frames in parallel within the time corresponding to one frame.

Here, the rearrangement of reproduced data will be described with reference to FIGS. 9 and 10. FIG. 9 shows a track recorded on the magnetic tape, and track 0a is the 0th track of the a frame. As is clear from the figure, each frame is composed of 10 tracks. L in FIG.
1 and the data reproduced from the L3 head is channel 1
(CH1), and similarly R1 and R3 are channel 2
(CH2), L2 and L4 to channel 3 (CH3),
When R2 and R4 are set to channel 4 (CH4), the track arrangement reproduced from each channel is as shown in FIG. When the tracks are arranged as shown in FIG. 10A and input to each channel of the decompression / decoding circuit 15 of FIG. 1, all the information of one frame is not complete, and the normal image information of one frame is obtained. Not decrypted. Therefore, the memory circuit 14 rearranges all the data of the same frame as shown in FIG. 10B so that all the data of the same frame are in a normal track arrangement, and then input to the decompression / decoding circuit 15. Accordingly, the decompression / decoding circuit 15 decodes and outputs the image information or the compressed image information every 4 frames. At this time, the decompression / decoding circuit 1
Reference numeral 5 corrects and corrects error data in the decoding process. However, the correction is completed on a frame-by-frame basis, whereas the correction is complemented by the input previous frame data, and in this case, the data is complemented by the data four frames before. Therefore, it is desirable that the data of the sync block that cannot be completely corrected be complemented by the data of the same sync block number from the decompression / decoding circuit that is processing the immediately preceding frame data.

The image information or compressed image information output from the decompression / decoding circuit is transferred to a recording medium such as a hard disk and recorded while the frame number and the recorded sector and address are managed.

As described above, when recording at the normal speed,
Cylinder with a lead angle of 9.15 degrees is equipped with one pair of heads for recording, and in order to reproduce at 4 times speed, the cylinder lead angle is corrected to 4 times for a cylinder changed to 9.10 degrees. The same track angle can be obtained by mounting four heads, i.e., four pairs of heads in a cylinder and doubling the tape feed speed, and reproducing all data at quadruple speed.

The correction of the cylinder lead angle for quadruple speed reproduction can be calculated from the tape speed change, the initial cylinder lead angle, and the cylinder rotation peripheral speed.

At this time, the change in the relative speed of the head due to the change in the tape feed speed is sufficiently small, and it is a slight change that can be dealt with by the reproduction signal processing unit. The reproduction data reproduced from each channel is recorded in track units. By performing the rearrangement, and performing the same track and conversion as in the case of reproducing at the normal speed, the same decoding circuit used in the normal reproducing device can be used for processing, thereby reducing the circuit cost.

With such a configuration, recording and reproduction are separately performed on the VTR.
In this case, since it is possible to deal with the change of the lead angle of the cylinder and a slight change of the traveling system by limiting the reproduction speed, the total cost is cheaper than the expensive VTR using a piezoelectric element or the like. A high-speed player with high reliability can be realized.

Next, a high-speed recording device for dubbing and recording the compressed video signal reproduced by the high-speed reproducing device at a high speed will be described with reference to the block diagram of FIG. In FIG. 11, the first channel input terminal 25 receives the compressed image information every four frames of a frame, e frame, i frame, ..., And the second channel input terminal 26 receives b frame, f frame, and so on. The compressed image information of every 4th frame of j frame ... Is input, and the compressed image information of every 4th frame of c frame, g frame, k frame ... Is input to the third channel input terminal 27. 4 channel input terminal 28 has d frame / h
It is assumed that the compressed image information of every four frames such as frame · l frame ... Is input. The modulation circuit 20 adds an error correction code to the input compressed image data and divides it into 10 tracks per frame. At this time, the data output from each channel of the modulation circuit 20 is shown in FIG.
The tracks are the same as in (b). However, even if such data is directly recorded by the 4-channel recording head, the normal recording format is not recorded. Therefore, the system control 23 and the memory control circuit 2
According to the control of 2, the memory circuit 21 outputs an appropriate rearrangement. The output of the memory circuit 21 becomes the same arrangement as that in FIG. 10A, and the same track arrangement as the recording format recorded at the normal speed can be recorded.

Next, the high-speed regenerator according to the present invention has a problem that reproduction cannot be performed at a normal speed because the lead angle of the cylinder is changed. Within each playback track,
It is shown that this is possible by synthesizing the outputs of the selected eight heads.

When reproduction is performed at normal speed by the 4 × speed reproducing device of the present invention, the lead angle of the cylinder is different from that at the time of recording.
As shown in FIG. 5, since the track angle scanned by the reproducing head is different from the recording pattern, reproduction is performed across the recording track. Therefore, the reproduction envelope does not have a constant output, and the azimuth is different for each track, resulting in an intermittent envelope. FIG. 6 conceptually shows the output levels of eight heads corresponding to the rotation angle of the cylinder.

However, these head outputs have regularity, and it was devised to reproduce by reproducing reproduction outputs of four pairs of heads.

Basically, one rotation of the cylinder is sufficient to reproduce the same two tracks as in the normal reproduction.
FIG. 6 shows a locus and a reproduction envelope when the tape travels at a normal tape feeding speed in the double speed reproducing device.

As is apparent from FIG. 6, when the 4 × speed reproducing device is reproduced by the normal feed, 8 heads scan 4 tracks, and when the reproduction outputs are combined, approximately 1/2 minute of each track is reproduced. You can

This is because when the reproducing head crosses the track, the output from the reproducing head can be taken out if only part of the track width of the reproducing head is on the recording pattern. In a usual design, the track width of the reproducing head is about 1.4 times as large as the recording track, which is a designed value, so that an envelope wider than that in the schematic diagram can be obtained.

Practically, it is appropriate to consider that the reproducing head is effective at least in a range where the reproducing head is on-tracked at least ½ of the recording track width and reproducing. FIG. 7 shows the range of tracks that can be reproduced per cylinder revolution and the selection of the reproducing head based on this criterion. The reproducible range of each head has the same shape, and the overlapping portions are overwritten in FIG. 7.

The problem is when to combine the outputs of the heads. In the present invention, an optimum selection method is devised in various cases from the relationship between cost and reproduced image quality.

In this embodiment of the 4 × speed reproducing device, one track is divided and reproduced by 4 heads.

As a first example, the level of each reproduction envelope is detected, and the output of only the vicinity of the maximum level is set as the correct reproduction output, and the output of each head is switched. In FIG. 1, the information at the time when the envelope reaches the maximum level is output from the reproduction / demodulation circuit 13 to the system control 17, and the read signal from the memory control unit 16 is output to the memory circuit 14 to output the four systems of memory circuit outputs. The data can be reproduced at the standard speed by outputting it to the extension decoding circuit 15 of the system.

As a second example, in the first example, an error is likely to occur in the head selection timing, and in order to obtain a reproduced image of higher quality by performing more strict head switching, the rotation cycle of the rotary cylinder and digital recording are performed. If the sync signal (sync data) of the data block being read is read and the valid / invalid data is identified in units of the data block from which the sync data has been read and the playback head data is selected, more accurate head switching becomes possible and the playback image It is possible to obtain a reproduced image with higher image quality, because a part of the image is not interrupted.

As a third example, in order to perform perfect head switching and to eliminate the missing part of the reproduced image, the error correction code applied to each data block unit of each reproducing head output is decoded and the error The presence / absence of a data block in which no error is detected is determined to be correct data, and the address data (I
If rearrangement is rearranged by (D data), a reproduced image with higher image quality can be obtained.

In the first to third embodiments, there is a conflict between the method of selecting the output of the reproducing head, the circuit scale for realizing it, and the required reproduction image quality. Therefore, selection may be made according to the intended use.

Further, in the first and second embodiments, the rotation of the cylinder requires speed and phase control, but in the third embodiment, it can be reproduced only by speed control. In addition, the search function required for a normal VTR has the circuit configuration shown in FIG. 1 and receives the identification signal of valid data from the reproduction / demodulation circuit and selects the read signal from the memory circuit that is collectively stored and outputs it to the expansion decoding circuit of one system. Searching is also possible by doing.

Next, a method of monitoring the playback screen of the high-speed playback device of the present invention will be described by showing a specific example. In the above-described embodiment, if the image data output from one of the decompression / decoding circuits 15 in FIG. 1 is monitored by D / A, only the image every 4 frames can be monitored, and any abnormalities in the other images. Even if there is, it cannot be recognized. This embodiment solves this problem and will be described with reference to FIGS. 12 and 13.

In FIG. 12, 12 to 17 are the same as those in FIG. 1, and therefore their explanations are omitted. The image data output from the 4-channel decompression / decoding circuit 15 is 3
0 is input to the memory circuit. In the memory circuit, the image data for 4 frames is temporarily stored in the memory, and by the control of the system control 17 and the memory control circuit 31, the frame data of each channel is thinned out in the horizontal direction and the vertical direction by 1/2, and It is combined as image information. The combined image data is converted into an analog signal of luminance / color difference by the D / A circuit 32. A synchronization signal is added to the luminance signal and is output to the monitor through the low pass filter 33.

The color difference signal is also output to the monitor through the low pass filter 33. FIG. 13 shows an image of the screen output on the monitor. In this figure, it can be seen that the A, B, C and D frames are combined into one frame.

As a result, all four frames can be recognized on one screen, and an abnormality in each channel can be dealt with each time, so that the operator operating the high-speed regenerator can use the system with more peace of mind.

Next, the method of monitoring the audio signal of the high-speed player according to the present invention will be described by showing a concrete example. In the above-described embodiment, if the audio data output from one of the decompression / decoding circuits 15 in FIG. 1 is D / A output to the speaker, only the audio at every four frames is output, which is a discontinuous audio. Therefore, low frequency noise is heard, and good monitoring cannot be performed. This embodiment solves this problem and will be described with reference to FIG.

In FIG. 14, 12 to 17 are the same as those in FIG. 1, and therefore their explanations are omitted. Digital audio data decoded by the 4-channel decompression decoding circuit 15 is input to 40 memory circuits. In the memory circuit 40, four frames of audio data are temporarily stored in the memory, and by controlling the system control 17 and the memory control circuit 41, the audio data of each channel is resampled at a quadruple sampling frequency.
It is compressed within one frame time. Voice band detection circuit 46
Then, a section including a signal in a specific voice band (for example, a human voice band) is detected, and the detected section information is output to the system control 17. Based on the section information, the memory control circuit 41 is compressed by the command of the system control 17 while the detection section is slow (for example, normal sampling frequency) and the other sections are fast (for example, 4 times the sampling frequency or more). The audio data for four frames is read out and controlled so that the total time is within one frame time. The D / A circuit 42 converts the frequency variable data and clock into an analog signal, and outputs the analog signal to the speaker through the low pass filter 44.

Although the control method that can be set within one frame time has been described above, it may be set within any appropriate frame time. For example, the audio data compressed on the time axis into one frame may be controlled so that the total time becomes 16 frame times by changing the data and clock within several frames (for example, 16 frames). By performing such control, it becomes easier for the operator to hear the voice, and a comfortable operating environment can be provided.

As described above, since the audio signals for four frames are time-axis-compressed and output within one frame time, good high-speed reproduced audio can be monitored, and particularly a certain audio band (especially human being) can be monitored. By adding a control for slowing the voice) and speeding the other voices, it becomes easier for the operator to recognize, and a good function for searching the edit point can be realized.

[0059]

According to the present invention, all the data can be read at a speed n times faster than that at the time of recording, and can be reproduced at the same speed as at the time of recording. Can be built.

[Brief description of drawings]

FIG. 1 is a conceptual block diagram showing signal processing of a 4 × speed reproducing device in an embodiment.

FIG. 2 is an explanatory diagram of a cylinder configuration of a recording system and an explanatory diagram of a recording tape pattern in the embodiment.

FIG. 3 is a block diagram of a normal recording / reproducing system and a conceptual diagram of cylinder tape running.

FIG. 4 is an explanatory view of a cylinder structure (head arrangement) and an explanatory view of a head height in an embodiment of the present invention.

FIG. 5 is an explanatory diagram of a traveling locus of a reproducing pair head when standard speed reproduction is performed by a 4 × speed reproducing device.

FIG. 6 is an explanatory diagram of a reproduction envelope when standard speed reproduction is performed by a 4 × speed reproduction device.

FIG. 7 is an explanatory diagram showing a reproducible range of a track when standard speed reproduction is performed by a 4 × speed reproduction device.

FIG. 8 is an explanatory diagram showing a reproducible range of a track when standard speed reproduction is performed by a 4 × speed reproduction device.

FIG. 9 is an explanatory diagram illustrating an arrangement of tracks recorded on a magnetic tape.

FIG. 10 is an explanatory diagram of reproduction data rearrangement processing in a 4 × speed reproduction device.

FIG. 11 is a block diagram showing signal processing in a 4 × speed recording machine.

FIG. 12 is a block diagram illustrating a method of monitoring a reproduced image in a 4 × speed reproducing device.

FIG. 13 is an image diagram explaining a method of monitoring a reproduced image in a 4 × speed reproducing device.

FIG. 14 is a block diagram illustrating a method of outputting an audio signal in a 4 × speed player.

[Explanation of symbols]

0, 1 Recording head in the embodiment 2 Tape 3 Circuit block for compressing input signal data 4 Circuit block for expanding reproduction compressed data to original input data 5 Indication of tape feeding speed 6 Magnetization pattern on magnetic tape Angle (track angle) 7 Angle indicating the trajectory of the head on the tape when the magnetic tape does not run (still angle) 8 Magnetization pattern recorded on the tape 1 track 9 Rotating cylinder 10 Rotating cylinder 10 Combi head Relative height relationship 11 Stagger distance between combi heads 12 Reproducing amplifier 13 Circuit block for converting signal reproduced from head to digital data 14 Circuit block for temporarily storing data reproduced from 4 systems 15 Image in frame unit Decompresses and decodes information that has been compressed. 16 Collects all playback data. Control unit for selecting data to be read from the stored memory 17 Circuit block for controlling signal system as a whole VTR 20 Modulation circuit block 21 Memory circuit block 22 Memory control block 23 VTR system control 24 Recording amplifier 25, 26, 27, 28 Input Terminal 30 Memory circuit block 31 Memory control block 32 D / A circuit block 33 Low pass filter 34 Monitor 40 Memory circuit block 41 Memory control block 42 D / A circuit block 43 Voice band detection circuit 44 Low pass filter 45 Speaker

Claims (12)

[Claims] 1. A recording data recorded on a magnetic tape at a first recording rate serving as a reference in a first magnetic recording device, and a second reproducing rate which is n times the recording rate. The standard recording high-speed reproducing system including the magnetic recording / reproducing apparatus of claim 1, wherein the number of reproducing heads of the second recording / reproducing apparatus is n times as large as the number of recording heads of the first apparatus, The angle of the tape running guide of the cylinder part is corrected to be the same track angle with respect to the angle of the recording pattern, the number of rotations of the rotating cylinder is the same, the tape feeding speed is n times the running speed, and 1 / n
A standard recording high-speed reproducing system using a helical scan type VTR, which is characterized by reproducing all data at the time of. 2. The standard recording high-speed reproduction system according to claim 1, wherein the record information is image information, and data grouped in a specific unit is divided into a plurality of track units and recorded. A standard recording that has a circuit that has the function of rearranging the data separately reproduced in n-track units reproduced by the double head in the original track order, and after decoding the data in a specific unit group High speed playback system. 3. The standard recording high-speed reproduction system according to claim 1, wherein the record information is image information, and data grouped in frame units is divided into a plurality of track units and recorded, which is n times as large. The head has a circuit having a function of rearranging the data reproduced individually in n track units in the original track order and outputting n times as many frame unit data at the same time. An n-channel decoding circuit having a function of decoding into image information and an error correction function of correcting erroneous data in the decoding process is provided, and for a data block that cannot be completely corrected by the error correction of the decoding circuit, Standard recording high-speed reproducing system characterized by correcting or complementing with data of the same block number of a decoding circuit for decoding frame data of one frame before 4. A second recording in which the same recording format as the reference recording format recorded on the magnetic tape by the first magnetic recording device is n times the recording rate of the first magnetic recording device. A standard recording high-speed recording system comprising a second magnetic recording / reproducing apparatus for recording at a rate, wherein the number of recording heads of the second recording / reproducing apparatus is n times the number of recording heads of the first apparatus, The angle of the tape running guide of the rotating cylinder part on which the head is mounted is corrected so as to be the same track angle with respect to the angle of the recording pattern, the rotational speed of the rotating cylinder is the same, and the tape feeding speed is n.
A standard recording high-speed recording system using a helical scan type VTR, which runs twice as fast and records all data in 1 / n the time of recording. 5. The standard recording high-speed recording system according to claim 4, wherein the recording information is image or audio information, and a recording signal input at an n-fold transfer rate is recorded by an n-fold head. 5. A standard recording high-speed recording system having a circuit having a function of rearranging so as to have the same track and track as the recording format recorded by the first magnetic recording device described in claim 4 and inputting to each head. 6. The standard recording high-speed reproducing system according to claim 1, wherein when the second magnetic recording / reproducing apparatus reproduces at the same speed as the first recording rate, one recording track is used as a recording head. A standard playback method in which playback is performed by dividing the playback data by n times the playback head, and the playback data is rearranged and restored to the original recorded data. 7. The standard reproduction system according to claim 6, wherein n
A standard playback method characterized by selecting the output of a specific playback head and restoring it to the original data, depending on the size of the playback output envelope of the playback head, when splitting playback with double playback heads. 8. The standard reproduction system according to claim 6, wherein n
When dividing and reproducing with a double reproducing head, the sync signal (sync data) for each data block added to the recorded digital data is restored and specified in data block units from the relationship with the cylinder rotation phase. A standard playback method that selects the output data of the playback head and restores it to the original data. 9. The standard reproduction method according to claim 6, wherein n
When dividing and reproducing with the double reproducing head, the error correction code added to the recorded digital data is decoded and the output data of a specific reproducing head is selected in error correction block units based on the error rate of the data. A standard playback method characterized by restoring to the original data. 10. The standard recording high-speed reproduction system according to claim 2, wherein the recording information recorded on the magnetic tape is image information, and the data grouped in frame units is divided into a plurality of track units. The recorded information of the magnetic tape is separately reproduced by n times of heads in n track units, and the reproduced data is rearranged again in the original track order at the same time as n times of frame unit data. It has a circuit having a function of outputting, a function of decoding simultaneously output frame unit data into original digital image data, and a function of decoding the simultaneously output image data of n frames in the horizontal and vertical directions. A standard recording high-speed playback system characterized by synthesizing one screen and outputting it to a monitor by thinning out data. 11. The standard recording high-speed reproduction system according to claim 2, wherein the recording information recorded on the magnetic tape is image and audio information, and the data grouped in frame units are recorded in a plurality of track units. The information recorded on the magnetic tape is divided and recorded separately by n times of heads in n track units, and the reproduced data is rearranged again in the original track order and n times of frame unit data is recorded. A circuit having a function of simultaneously outputting as, and a function of decoding the frame-by-frame data output at the same time into original digital image data and digital audio data,
The n frames of audio data output at the same time are
A standard recording high-speed playback system characterized by resampling at a sampling frequency of n times, storing within one frame time, D / A and outputting to a speaker. 12. The standard recording high-speed reproduction system according to claim 11, wherein audio data for n frames is resampled at a sampling frequency of n times and stored within one frame time. When re-sampling audio data for n frames compressed in the one frame time, a section in which audio in a specific audio band is detected is re-sampled at an appropriate sampling frequency lower than n times the sampling frequency, and Section is resampled at an appropriate sampling frequency higher than n times the sampling frequency,
A standard recording high-speed reproduction system characterized by performing D / A and outputting to a speaker so that the total time is within a predetermined appropriate frame time.