JPH08140032A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE: To perform high-speed reproduction of the same fold speed number in the case of any data rates and to surely provide data for high-speed reproduction by controlling a tape speed at the time of recording, arranging signals used for the high-speed reproduction in an area where a head can perform tracing reproduction, recording them, controlling the tape speed of reproduction and reproducing the signals for the high-speed reproduction. CONSTITUTION: A recording data formatting circuit 11 constitutes synchronization signal blocks and formats recording data so as to be the data arrangement of tracks to be recorded and a timing signal generation circuit 12 generates and outputs the timing signals of synchronization signals or the like. A data rate detection circuit 18 detects what value is the data rate of an input bit stream and outputs the signals for indicating the data rate and a tape speed control circuit 19 controls the tape speed at the time of the recording corresponding to the signals for indicating the data rate of the bit stream from the data rate detection circuit 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital video tape recorder having a track format for recording a digital video signal and a digital audio signal in predetermined areas of diagonal tracks (hereinafter
Digital VTR), in which a digital video signal and a digital audio signal are input in a bit stream, and the bit stream is recorded.
It is about.

[0002]

2. Description of the Related Art FIG. 20 shows a general home digital VT.
It is a figure which shows the track in R. In the figure, a diagonal track is formed on the magnetic tape, and one track is divided into two areas: a video area for recording a digital video signal and an audio area for recording a digital audio signal.

There are two methods for recording video and audio signals in the above home digital VTR. One is a so-called baseband recording method in which an analog video signal and an audio signal are input and recorded using a high-efficiency encoder for video and audio. The other is a so-called transparent recording system for recording a digitally transmitted bit stream.

ATV being discussed in the United States
The latter transparent recording method (tricky method) is suitable for recording the (Advanced Television) signal. The reason is that the ATV signal is already a digitally compressed signal and a high-efficiency encoder or decoder is not necessary, and since it is recorded as it is, there is no deterioration in image quality. On the other hand, the disadvantage is that
This is the image quality during special playback such as high-speed playback and still and slow motion. Particularly, if the bit stream is recorded on the diagonal track as it is, almost no image can be reproduced at the time of high speed reproduction.

As a method of the digital VTR for recording the above ATV signal, "Intern" held in Ottawa, Canada from October 26 to 28, 1993.
national Workshop on HDTV '
"A Recording" in the technical announcement in "93"
Method of ATV data on aC
There is an "Digital Summarization VCR". Hereinafter, this content will be described as a conventional example.

As a basic specification of a home digital VTR prototype, SD (Standard Define) is used.
mode), the recording rate of the digital video signal is 25 Mbps, and the field frequency is 60 Hz.
In some cases, one frame of video is recorded in a video area of 10 tracks. Here, if the data rate of the ATV signal is set to 17 to 18 Mbps, transparent recording of the ATV signal becomes possible in this SD mode.

FIG. 21 is a head trace diagram during normal reproduction and high-speed reproduction of the digital VTR. In the figure, each track is alternately recorded obliquely by heads having different azimuth angles. During normal reproduction, the tape feed speed is the same as during recording, so the head can trace along the recording track as shown in FIG. However, during high speed reproduction, the tape speeds are different, so that it is possible to trace across several tracks and reproduce only the fragments of each same azimuth track. Figure 2
1 (b) shows the case of fast-forwarding at 5 times speed.

In the MPEG2 bit stream, only intra-coded blocks can be independently decoded without referring to other frames. If the MPEG2 bit stream is recorded on each track in order,
In the reproduction data at the time of high speed reproduction, an image is reconstructed from the burst using only the intra code. At this time, the reproduced area is not continuous on the screen, and the block fragments spread on the screen. Furthermore, since the bitstream is variable length coded,
There is no guarantee that all of the screens will be updated periodically,
Some parts may not be updated for a long time. As a result, the image quality at the time of high speed reproduction cannot be said to be sufficient, and it cannot be accepted in a home digital VTR.

FIG. 22 is a block diagram on the recording side of a bit stream recording device capable of high speed reproduction. Here, the video area of each track is composed of a main area for recording bit streams of all ATV signals, and an important part (H of the bit stream used for image reconstruction during high-speed reproduction).
(P data) and a copy area for recording. During high speed playback, only intra-coded blocks are effective, so
Although this is recorded in the copy area, in order to further reduce the data, low frequency components are extracted from all the intra-coded blocks and recorded as HP data. In FIG. 22, 1 is a bit stream input terminal, 2 is a main area bit stream output terminal, 3 is a copy area HP data output terminal, 4 is a variable length decoder, 5 is a counter, and 6 is data. Extraction circuit, 7 is EO
This is a B (End of Block) addition circuit.

The MPEG2 bit stream is input from the input terminal 1 and output from the output terminal 2 as it is,
It is sequentially recorded in the main area. On the other hand, the bit stream from the input terminal 1 is also input to the variable length decoder 4, and M
The syntax of the PEG2 bit stream is analyzed, the intra image is detected, the timing is generated by the counter 5, the low frequency components of all blocks of the intra image are extracted by the data extracting circuit 6, and E
The OB adding circuit 7 adds EOB to form HP data and records it in the copy area.

FIG. 23 is a diagram showing a structure on the reproducing side in a conventional bit stream recording / reproducing apparatus. During normal playback, all bitstreams recorded in the main area are played back, and MPEs outside the digital VTR are played.
It is sent to the G2 decoder. At this time, since it is during normal reproduction, the HP data recorded in the copy area is discarded, but this selection is made by data separation. On the other hand, during high-speed reproduction, only HP data in the data-separated copy area is collected and sent to the MPEG2 decoder, and the bitstream in the main area is discarded. This selection is also done by data separation.

Next, the arrangement of the main area and the copy area on one track will be described. FIG. 24 is a diagram showing an example of a head trace during high-speed reproduction at 9 × speed. If the tape speed is an integral multiple speed and phase lock control is performed, head scanning is synchronized with the same azimuth track. Therefore, the position of the reproduced data is fixed. In FIG. 24, if it is assumed that a portion in which the output level of the reproduction signal is higher than −6 dB is reproduced, a shaded area is reproduced by one head. FIG. 24 shows an example of 9 × speed, and at 9 × speed, signal reading in this shaded area is guaranteed. Therefore, HP data may be recorded in this area. However, at other speeds, signal read out is not guaranteed and this area must be chosen for reading at some tape speeds.

FIG. 25 is a diagram showing an example of three tape speed scan areas in which the heads are synchronized with the same azimuth track. The area scanned at each tape speed has some overlapping areas. A copy area is selected from these areas to ensure the reading of HP data at different tape speeds. Although FIG. 25 shows the case of fast-forwarding at 4 times, 9 times, and 17 times, these scan areas are -2.
Double, -7 times, -15 times the same as fast forward.

At some tape speeds it is not possible for the head to trace the exact same area. This is because the number of tracks traversed by the head differs depending on the tape speed. In addition, it should be possible to trace from any one of the same azimuth tracks. FIG. 26 is a diagram showing an example of head traces at different tape speeds. In FIG. 26, areas 1, 2, and 3 are selected from the overlapping area of 5 × speed and 9 × speed. By repeatedly recording the same HP data on 9 tracks, the HP data can be read at either 5 × speed or 9 × speed.

FIG. 27 is a diagram showing an example of a head trace at 5 × speed. As can be seen, by repeatedly recording the same HP data on the same number of tracks as the tape speed, the HP data can be read by the head synchronized with the same azimuth track. Therefore, by repeating the duplication of the HP data for the same number of tracks as the maximum tape speed for high speed reproduction, the duplicate HP data becomes
Reads in both forward and reverse directions at some tape speeds.

FIG. 28 is a diagram showing an example of the main area and the copy area. In the home digital VTR, the video area of each track is composed of 135 sync blocks, the main area is 97 sync blocks, and the copy area is 32 sync blocks. For this copy area, the overlapping areas corresponding to 4, 9, and 17 times speed shown in FIG. 25 are selected. In this case, the data rate in the main area is about 17.46 Mbps, and the same data is recorded 17 times in the copy area, which is about 338.8 kbps.

[0017]

The conventional apparatus is configured as described above, and when recording a bit stream transmitted at a certain fixed data rate, the overlapping areas reproduced at a plurality of high reproduction speeds are recorded. The data for high-speed playback was selected and placed.

Here, in the future, for example, DVB (Digit)
2. Description of the Related Art There is a digital VTR that records a bit stream in which signals having different data rates, such as an al video broadcasting signal, are multiplexed. Even in this case, the transparent recording method is suitable, and when recording signals with different data rates, the number of rotations of the rotating drum is kept constant, and the tape speed is changed according to the data rate ratio, so that it is recorded on the track. Bitstreams can be recorded at the same recording rate. For example, when the data rate of the bit stream becomes 1/2, 1/2 of the tape speed v when the data rate is 1
If the tape speed is changed to the speed of 1, the signal will be recorded on the track at the same recording rate and format as in the case of the data rate 1. Further, when the data rate is 1/4, if the tape speed is changed to 1/4 of the tape speed v when the data rate is 1, the case where the bit rate on the track is 1 The signal is recorded at the same recording rate and format.

When a bit stream transmitted by multiplexing signals having different data rates as described above is recorded and high-speed reproduction is performed, the recorded track is the same at any data rate, but at the time of reproduction. When the high speed reproduction speed at the data rate 1 is m times speed reproduction, the m times speed at the data rate 1/2 signal is reproduced at a speed corresponding to (1/2) × m times speed at the data rate 1. That is, the m-times speed of a signal having a data rate of 1/4 is reproduced at a speed corresponding to the data rate (1/4) × m-times speed.

Therefore, in the conventional apparatus, since the high-speed reproduction data is arranged in the area reproduced at a predetermined high-speed reproduction speed in the bit stream having a fixed data rate, the recorded signals of different data rates are respectively arranged. When performing high-speed playback, the playback tape speed must be changed according to the data rate ratio in order to perform high-speed playback at the same double speed number. It depends on the data rate. Therefore, depending on the data rate of the bit stream, there is a problem that the arranged data for high speed reproduction may not be traced.

In each case of all data rates, high-speed reproduction data may be arranged in an area traced at a predetermined double speed.
In R, the video area for recording the video signal is limited, and in order to arrange the area for recording the data for high speed reproduction in addition to the area for recording the data in the main area, the amount of data for high speed reproduction is limited. come. Therefore, there is a problem that the number of bit stream data rates that can be handled is limited.

The present invention has been made in order to solve the above problems, and when a bit stream in which signals having different data rates are multiplexed is recorded on a track at the same recording rate and high speed reproduction is performed. Also in the case of the above, even if the data area for high speed reproduction is not provided for each data rate, the same high speed reproduction can be performed at any data rate, and the data for high speed reproduction can be surely reproduced. An object is to obtain a magnetic recording / reproducing device.

[0023]

According to a first aspect of the present invention, there is provided a magnetic recording / reproducing apparatus for extracting a signal used for high-speed reproduction from a normal recording signal, and a tape speed during recording according to a data rate of the signal. A means for controlling and a means for arranging and recording the signal used for the high-speed reproduction in a region where the head can trace and reproduce the m-times speed (| m |> 1) high-speed reproduction for signals of all kinds of data rates to be recorded. And a means for controlling the tape speed of reproduction based on the double speed number and the data rate when performing high-speed reproduction at the m-times speed for recorded signals of all kinds of data rates, and the area on the track The signal for high speed reproduction arranged at is reproduced to obtain the signal for high speed reproduction at each data rate.

In the magnetic recording / reproducing apparatus according to the second aspect of the present invention, the data rate ratio r (r
Is a positive number), the tape speed during recording is controlled to be 1 / r, and when the m-fold speed is performed for each of the signals to be recorded, the reproduction tape speed is m /
The signal for high speed reproduction is arranged and recorded in the area traced by the head when reproduced at a speed corresponding to r times speed.

[0025]

In the magnetic recording / reproducing apparatus according to the first aspect of the present invention, means for controlling the tape speed at the time of recording according to the data rate of the recording signal, and the signal used for the high speed reproduction are provided.
M-times speed (| m
|> 1) In high-speed reproduction, the head has a means for recording and arranging in a traceable and reproducible area, and when performing high-speed reproduction at the m-times speed for signals of all kinds of recorded data rates, Since there is a means for controlling the tape speed of reproduction based on the data rate and the signal for high speed reproduction arranged in the area on the track is reproduced and the signal for high speed reproduction at each data rate is obtained, the data rate is different. Even when a bit stream in which signals are multiplexed is recorded and high-speed reproduction is performed, the same high-speed reproduction is performed at any data rate, and high-speed reproduction data can be reliably obtained.

In the magnetic recording / reproducing apparatus according to the second aspect of the present invention, the data rate ratio r between the signals to be recorded is r.
Depending on (r is a positive number), the tape speed during recording is 1 / r
And a signal for high-speed reproduction in an area traced by the head when the tape speed for reproduction is reproduced at a speed corresponding to m / r times when performing m-times speed for each of the signals to be recorded. Since data is arranged and recorded, even when a bit stream in which signals with different data rates are multiplexed is recorded on a track at the same recording rate and high speed reproduction is performed, the data area for high speed reproduction to be arranged is set for each data rate. , The same high speed reproduction is performed at any data rate, and the data for high speed reproduction can be surely obtained.

[0027]

【Example】

Example 1. Hereinafter, the present invention will be described with reference to the drawings. FIG.
FIG. 3 is a block diagram showing a configuration example of a recording side of the bitstream recording / reproducing apparatus in the embodiment of the present invention. In the figure, 10 is a bit stream input terminal, 11 is a recording data formatting circuit that forms a synchronization signal block (sync block), and formats the recording data so as to have a data arrangement of a track to be recorded, and 12 is a synchronization signal. A timing signal generation circuit for generating and outputting a timing signal such as, a recording data output terminal, a variable length decoder 14, a counter, 16 a data sampling circuit, 17 an EOB (End of Block) addition circuit, Reference numeral 18 is a data rate detection circuit which detects what value the data rate of the input bit stream is, and outputs a signal showing the data rate, and 19 is a signal showing the data rate of the bit stream from the data rate detection circuit 18. Tape speed control to control the tape speed during recording according to the It is a road.

Next, the operation will be described in detail. MP
The bit stream of the EG2 is input from the input terminal 10 and sent to the recording data formatting circuit 11 to be the timing signal generating circuit 1 as data for the main area.
A sync block is formed by adding a sync byte on the basis of the sync signal from 2. On the other hand, the input terminal 10
Is also sent to the variable length decoder 14, the syntax of the MPEG2 bit stream is analyzed to detect an intra image, and the counter 15 counts the number of decoded DCT coefficients to determine the timing. It is generated and output to the data extracting circuit 16. The data extracting circuit 16 extracts low frequency components of all blocks of the intra image from the input bit stream based on the timing signal from the counter 15 and outputs a predetermined number of DCTs at low speed and high speed.
Data corresponding to the coefficient is sent to the EOB adding circuit 17, EOB is added by the EOB adding circuit 17, high speed reproduction data for low speed multiplication and high speed reproduction is constructed, and output to the recording data formatting circuit 11.

The data sampling circuit 16 may sample the low-speed double data and the high-speed double data at the same timing or at different timings. The difference in the timing means that the number of DCT coefficients in one recorded video block (a unit obtained by performing orthogonal transformation on the encoder side) is different. Since the area for recording the high speed reproduction data is limited, if the number of DCT coefficients in one video signal block is increased, the high speed reproduction area for recording will be increased if the high speed reproduction area has the same area. It requires a lot and slows down the screen refresh during playback. Instead, the image quality is improved. The trade-off between the refresh and the image quality determines the timing for extracting the data.

In the recording data formatting circuit 11,
The data for high speed reproduction for low speed multiplication and high speed multiplication from the EOB adding circuit 17 is transferred to the timing signal generation circuit 12
A sync block for high speed reproduction is formed by adding a sync byte based on a sync signal from the sync block, and the sync block which is the data for the main area and the data for high speed reproduction are stored in a predetermined sync block on the track. The recording signal is configured to be recorded in the area. Then, the formatted recording signal is output from the recording data formatting circuit 11 to the output terminal 13 and subjected to recording signal processing such as digital recording modulation and recording amplification.
It is recorded on the magnetic tape by heads A and B of the azimuth type.

In this embodiment, assuming that the data rate of the input bit stream is 1, 1/2, 1/4, the tape speed is changed according to the data rate ratio at the time of recording. The data rate is 1 / the tape speed when the data rate is 1
If it is 2, the tape speed is halved and the data rate is 1
If it is / 4, recording is performed at a tape speed of 1/4. Therefore, in each data rate, the recording rate recorded on the track is the same, and the arrangement on the track is also the same.

Therefore, the data rate detection circuit 18 detects whether the data rate of the input bit stream is 1, 1/2 or 1/4, and generates a signal indicating a rate ratio with the data rate 1, for example. Then, it is sent to the tape speed control circuit 19. The tape speed control circuit 19 controls the tape speed for recording to change in accordance with the signal indicating the rate ratio of the data rate of the transmitted bit stream, and outputs it from the output terminal 13. Record the recorded data.

Next, the arrangement on the track for recording the high-speed reproduction sync block which is the high-speed reproduction data will be described. Now, the bitstream data rate is 1, 1
Since the case of / 2 and ¼ is set, the case where the double speed number of the high speed reproduction at this time is 4 times as the low speed double speed and 16 times as the high speed double speed will be described.

FIG. 2 is a diagram showing an example of the position of the head trace of the head B and the reproduction area in the track on the tape at the time of quadruple speed reproduction at the data rate ratio 1, where the tape speed is an integer multiple speed and phase lock is performed. If controlled, head scanning is synchronized with the same azimuth track and the position of the reproduced data is fixed. In FIG. 2, assuming that the portion where the output level of the reproduction signal is greater than −6 dB is reproduced, the area of the shaded portion on the track is reproduced from the head of the azimuth B, and the data for 4 × speed is recorded. The low-speed double recording area is area 1 or 2
The area for low speed multiplication is arranged in the area 1 of the track B, for example. In the case of 4x speed playback, track 4
Since the head traces for each book, the copy area may be arranged for every four tracks.

FIG. 3 is a diagram showing an example of the position of the head trace of the head A and the reproduction area in the track on the tape at the 16 × speed reproduction at the data rate ratio 1. If the tape speed is an integral multiple speed and the phase lock is controlled as in the case of the 4 × speed, the head scanning fixes the position of the data reproduced in synchronization with the same azimuth track, and the output level of the reproduction signal. Assuming that a portion larger than −6 dB is reproduced, the head portion of azimuth A reproduces a shaded area on the track.
The high-speed double recording area for recording the 6-times speed data can be arranged in the areas 1 to 8, and for example, the high-speed double recording areas are arranged in the areas 3 to 6. Further, in the case of 16x speed reproduction, the head traces every 16 tracks, so that even when a copy area is arranged for every 4 tracks, all the arranged areas can be traced and reproduced.

FIG. 4 shows an example in which the areas for high speed reproduction are arranged in the video area on the track of the home digital VTR based on the head trace in the case of the bit stream data rate 1. In the figure,
Reference numeral 20 is an area for low-speed multiplication of the B track for recording data at the time of quad-speed reproduction by the head of azimuth B, 21 to 24
Is an area for high speed doubling of the A track for recording the data at the time of 16x speed reproduction by the head of azimuth A, and area 2
Video areas other than 0, 21 to 24 are used as a main area for recording a bit stream which is data for normal reproduction.

The number of areas for the 4 × speed area and the 16 × speed area is not limited to the above, and they may be arranged in other areas shown in FIGS. 2 and 3.

Here, when performing 4 × speed reproduction and 16 × speed reproduction, the reproduction speed at the data rate of each bit stream is as compared with the case of data of data rate 1.
4x speed at a data rate of 1/2 corresponds to 2x speed, 16x speed corresponds to 8x speed, 4x speed at a data rate of 1/4 corresponds to 1x speed, and 16x speed corresponds to 4x speed. During reproduction, the tape speed for reproduction is changed according to each data rate as in recording. Therefore, in the case of the data rate 1, the 4 × speed reproduction traces the 4 × speed area 20 of FIG. 4 by the head B, and the 16 × speed reproduction traces the 16 × speed area 21-24 by the head A to obtain the high speed reproduction data. And Data rate 1 /
In the case of 4, since the 4 × speed reproduction is traced on the track at the 1 × speed, the 16 × speed area 21 to 24 in FIG. 4 by the head A or the 4 × speed area 20 by the head B is traced to obtain the 16 × speed. Since the reproduction is traced at 4 × speed, the 4 × speed area 20 by the head B can be traced and reproduced as high speed reproduction data.
In the case of this data rate 1/4, for example, the data in the 4x speed area 20 is used as the data in the 4x speed reproduction. If the data rate is 1/2,
The quadruple speed reproduction is traced on the track at the double speed, the tracing of the head B at this time can be performed as shown in FIG. 5, and the reproduced area can reproduce all the data of the B track. Therefore, the quadruple speed area 20 by the head B can be traced and reproduced as high speed reproduction data. Note that 16 × speed reproduction is traced at 8 × speed.

Therefore, by arranging the data for high speed reproduction in the area traced by the head at 4 times speed and 16 times speed at the data rate 1, 4 times speed reproduction, 16 times speed reproduction at the data rate 1/4, and It becomes possible to perform the 4 × speed reproduction at the data rate of 1/2 and reproduce the arranged high speed reproduction data. Then, the recording pattern is formed on the magnetic tape by repeatedly recording with the arrangement of the four tracks shown in FIG. 4 as one unit. For example, data for 4 × speed may be repeatedly recorded twice, and data for 16 × speed may be repeatedly recorded 8 times.

FIG. 6 is a diagram showing a case where data having a data rate ratio of 1 in the first embodiment of the present invention is reproduced at 4 × speed with a drum structure of 1 ch × 2. For example, two types of azimuths A and B are shown. 2 shows a head scan at the time of quadruple speed reproduction when data of data rate 1 is recorded by a 1ch × 2 drum structure in which the heads of FIG. Since the data for quadruple speed is recorded by the head of azimuth B, as shown in the figure, head B
The data for high speed reproduction (D1 to D4 in the figure) of the area for quadruple speed traced by the head B is reproduced in a state where the phase lock control is performed so as to trace. Further, FIG. 7 shows the data rate ratio 1 in the first embodiment of the present invention.
FIG. 6 is a diagram when 16 × speed reproduction is performed on a track on which the data of 1 is recorded with a drum configuration of 1 ch × 2. Since the 16x speed data is recorded by the azimuth A head, the high speed reproduction data of the 16x speed area traced by the head A in the state where the phase lock control is performed so that the head traces as shown in the figure ( In the figure, E1 to E4) are reproduced.

FIG. 8 shows 1 ch × on a track on which data having a data rate ratio of 1/2 in the first embodiment of the present invention is recorded.
It is a figure at the time of quadruple speed reproduction with 2 drum constitutions. At this time, the scan of the head becomes the same as the scan at the time of double speed reproduction at the data rate 1, and the head B scans 4 times as shown in the figure.
Phase lock control is performed so as to trace the double speed area. Since the quadruple speed data is recorded by the head of the azimuth B, the high speed reproduction data (F1 to F8 in the figure) of the quadruple speed area traced by the head B is reproduced.

FIG. 9 shows 1 ch × on a track on which data having a data rate ratio of ¼ according to the first embodiment of the present invention is recorded.
It is a figure at the time of quadruple speed reproduction with 2 drum constitutions. The head scan is the same as the scan at the 1 × speed reproduction at the data rate 1. Therefore, at this time, the 4 × speed data and the 16 × speed data can be reproduced. However, if the 4 × speed data by the head B is used, the phase lock control is performed so that the head B traces as shown in the figure. In this state, the high speed reproduction data (G1 to G8 in the figure) in the 4 × speed area traced by the head B is reproduced. The 16x speed data from head A is
The head A can scan the track twice to reproduce all the data, and this can also be used to obtain quadruple speed reproduced data.

FIG. 10 shows 1 ch on a track on which data having a data rate ratio of 1/4 according to the first embodiment of the present invention is recorded.
It is a figure at the time of 16-times speed reproduction with the drum composition of x2.
The scan of the head is the same as the scan at the quadruple speed reproduction at the data rate 1, and the phase lock control is performed so that the head B traces the quadruple speed area as shown in the figure. Four
Since the double speed data is recorded by the head of the azimuth B, the high speed reproduction data (H1 to H4 in the figure) of the 4 × speed area traced by the head B is reproduced.

Incidentally, in FIG. 6 to FIG. 10, the head is 1
Although a case of a ch × 2 drum structure is shown, the present invention is not limited to this, and two types of heads of azimuths A and B are paired to form a 2 ch × 1 drum structure or the heads are arranged in pairs and face each other. Even in the case of the 2ch × 2 drum structure, the area of high-speed reproduction data used at each rate and double speed uses the area traced by either the head A or the head B.
If the phase lock control is performed so that either of the above is traced in the same manner as described above, the data in the predetermined high-speed reproduction area is reproduced in the same manner as described above. However, 2ch x 2
The number of double speeds during high-speed playback is 1ch x
This is a double speed number that is ½ of the double speed number in the case of the configuration of 2, 2 ch × 1.

FIG. 11 is a diagram showing the structure of the reproducing side for realizing the magnetic recording / reproducing apparatus of the present invention. In the figure,
Reference numeral 30 is an input terminal for the reproduced data, 31 is a data rate determination circuit for determining the data rate of the bit stream recorded from the reproduced data, and 32 is a low speed double (4 times speed) or high speed during normal reproduction and high speed reproduction. Double (16
A reproduction mode signal generating circuit for generating and outputting a signal indicating a reproduction mode at each of double speed), and 33 for a signal indicating the data rate from the data rate discrimination circuit 31 and a reproduction mode signal from the reproduction mode signal generating circuit 32. Based on
This is a reproduction tape speed control circuit for controlling the reproduction tape speed during reproduction. Reference numeral 34 is a data separation circuit for separating the bit stream of the main area in the reproduction data from the data for high speed reproduction in the low speed double area and the high speed double area.
Reference numeral 35 is a data rate discrimination circuit 31 and a reproduction mode signal generation circuit 32 for reproducing each reproduction data from the data separation circuit 34.
A data switching circuit for switching and selecting on the basis of the signal from, and an output terminal 36 for the selected reproduction data.

Next, the operation will be described. The reproduction data is input from the input terminal 30, and the data rate determination circuit 31
At, the data rate in the bit stream of the reproduction data is determined, and a signal indicating the rate ratio is output.
The reproduction tape speed control circuit 33 controls the reproduction tape speed at the time of reproduction based on the signal indicating the rate ratio of the data rate from the data rate determination circuit 31 and the reproduction mode signal from the reproduction mode signal generation circuit 32.

That is, at the time of normal reproduction, the reproduction tape speed is 1 when the data rate is 1/2 as compared with the reproduction tape speed when the data rate is 1 at the normal reproduction.
If the data rate is 1/4, the reproduction tape speed is controlled to 1/4. Further, when performing 4 × speed reproduction and 16 × speed reproduction, the reproduction speed at the data rate of each bit stream is 2 × speed at 4 × speed at the data rate of 1 in comparison with the case of data at 1 × data rate. Correspondingly, the reproduction tape speed is controlled so that the 4x speed at the data rate of 1/4 corresponds to the 1x speed and the 16x speed corresponds to the 4x speed.

The reproduction data from the input terminal 30 is also sent to the reproduction data separation circuit 34, and the normal reproduction data in the main area of the reproduction data, the low speed double reproduction data in the low speed double area, and the high speed double area. The data is separated into the high-speed double reproduction data in (1) and output to the data switching circuit 35. The data switching circuit 35 switches and selects data based on the signal indicating the data rate of the reproduction data from the data rate determination circuit 31 and the reproduction mode signal from the reproduction mode signal generation circuit 32 and sends it to the output terminal 36. Here, at the time of normal reproduction, a bit stream that is normal reproduction data in the main area is selected at any data rate. At the time of high speed reproduction, data is selected by a reproduction mode signal indicating the data rate of reproduction data and low speed double (4 × speed) reproduction or high speed double (16 × speed) reproduction. When the data rate is 1, the low-speed area traced by the head B is reproduced at the 4-times speed as shown in FIG. 6, so the low-speed reproduction data is selected, and at the 16-times speed as shown in FIG. Since the high speed double area traced by the head A is reproduced, the high speed double reproduction data is selected. At the quadruple speed when the data rate is 1/2, the low-speed playback area traced by the head B is reproduced as shown in FIG. 8, so the low-speed reproduction data is selected. When the data rate is 1/4, the low speed double reproduction area traced by the head B shown in FIG. 9 is reproduced. Therefore, the low speed double reproduction data is selected. Since the data in the low speed double area traced by the head B is reproduced, the low speed double data is selected.

As described above, in the case of the data rate 1 and the cases of the data rates 1/2 and 1/4,
The double speed number of the high speed reproduction is set so that the data for the high speed reproduction is arranged in the traced area when the high speed reproduction is performed at the same double speed, and the quadruple speed and 1 at the data rate 1 are set.
Since high-speed reproduction data for 4x speed and 16x speed is arranged from the 6x speed reproduction trace and the data to be used is selected by switching the data rate of the reproduction data and the double speed number of reproduction, signals with different data rates are selected. Even when recording the multiplexed bit stream on the track at the same recording rate and performing high-speed reproduction, without providing a data area for high-speed reproduction to be arranged for each data rate,
The data for high speed reproduction can be reproduced at the time of 4 × speed reproduction at the data rates of 1, 1/2 and 1/4 and the 16 × speed reproduction at the data rates of 1 and 1/4, and the high speed reproduction of the same double speed number can be performed. Therefore, the data for high speed reproduction can be surely reproduced.

In the above embodiment, the case of the data rates 1, 1/2 and 1/4 is explained, but the value of the data rate is not limited to this, and other data rate ratios are used. Even at that data rate m
In the double-speed reproduction, if the head traces and reproduces the high-speed reproduction data by controlling the reproduction speed according to the data rate, the same effect as described above can be obtained.

Example 2. Another embodiment 2 of the arrangement on the track for recording the high speed reproduction data area will be described. Similar to the first embodiment, the case where the data rate of the bit stream is 1, 1/2, 1/4 and the double speed number of high speed reproduction is 4 times as low speed double speed and 16 times as high speed double speed will be described. To do.

FIG. 12 is a diagram showing an example of the head trace of the head A and the reproduction area in the track on the tape at the 16x speed reproduction at the data rate ratios of 1 and 1/2. At the time of 2, head A
Shows a trace in which there is an overlapping area on the trajectory traced by. If the tape speed is an integral multiple speed and the phase lock is controlled, the head scanning is synchronized with the same azimuth track and the position of the reproduced data is fixed. The portion indicated by I1 to I8 in FIG. 12 is a region that can be reproduced at 16 times speed at the data rate 1.
The portions indicated by I9 to I12 indicate the reproducible areas at 16 times speed at the data rate of 1/2. FIG. 13 is a diagram showing a reproduced signal in the trace at each data rate in FIG. 12 and a reproducible area on the track A,
The shaded area in FIG. 13 is the reproducible area. From FIG. 12 and FIG. 13, 16 at data rate 1
The overlap area that can be reproduced in common during double speed reproduction and 16x speed reproduction at a data rate of 1/2 is the portion indicated by I13 and I14. Further, in the case of 16x speed reproduction at the data rate 1, the head traces every 16 tracks, so even when a high speed reproduction area is arranged for every 4 tracks, all the arranged areas are traced and reproduced. In the case of 16x speed reproduction at a data rate of 1/2, a trace corresponding to 8x speed reproduction at a data rate of 1 is obtained, and since the head traces every 8 tracks, 4 tracks are similarly recorded. Even when a high-speed reproduction area is arranged for each, all the arranged areas can be reproduced.

Therefore, the high-speed double recording area for recording the 16-times speed data is arranged in the areas I13 and I14, which are the overlapping areas in the case of the data rates 1 and 1/2, and, for example, I13 of the areas I3 and I10. By arranging the same data in an area excluding I4 and arranging the same data in areas I6 and I11 other than I14, a high speed double area at 16 times speed is arranged. According to this, at the 16 × speed at the data rate 1, the regions I13, I14 and I3, I
6 can be reproduced, and at the time of 16 times speed at a data rate of 1/2, data arranged in a region other than I13 of regions I13, I14 and I10 and data arranged in a region other than I14 of region I11 can be reproduced. Data for high speed doubling at 16 times speed can be obtained.

FIG. 14 shows an example in which the areas for high speed reproduction are arranged in the video area on the track of the home digital VTR as described above. In FIG. 14, 40 is a low speed double area of the B track for recording data at 4 × speed reproduction by the head of azimuth B, and 41 to 46 are high speed of A track for recording data at 16 × speed reproduction by the head of azimuth A. It is a double area and areas 40 and 41
Video areas other than 46 are used as a main area for recording a bit stream which is data for normal reproduction. Here, 41 and 42 in the figure are the same data, and
3 and 44 are the same data. The low-speed double area is arranged in the same area as that of the first embodiment, and the description thereof is omitted.

In the quadruple speed reproduction, as in the case of the first embodiment, when the data rate is 1, the quadruple speed area 40 is traced by the head B to obtain high speed reproduction data. In the case of 2, the 4 × speed reproduction is traced on the track at 2 × speed, and the tracing of the head B at this time can be performed as shown in FIG. It can be traced and used as high-speed playback data. Further, when the data rate is 1/4, the 4 × speed reproduction is traced on the track at the 1 × speed, and therefore, the head A produces 16
The 4 × speed area 40 can be traced by the 4 × speed areas 41 to 46 or the head B. At this time, for example, the 4 × speed area 40 by the head B can be used as high speed reproduction data. Furthermore, 1 at a data rate of 1/4
Since 6 × speed reproduction is traced on the track at 4 × speed, the 4 × speed area 40 by the head B can be traced and reproduced as high speed reproduction data. The traces and operations during the 4 × speed reproduction at each data rate and at the 16 × speed reproduction at the data rate ¼ are the same as those in the first embodiment, and therefore the description thereof will be omitted.

Next, the 16 × speed operation for the data rates of 1 and 1/2 will be described. Data rate 1
The head trace of azimuth A at 16 times speed at 1/2 and 1/2 is as shown in FIG.
The reproduction speed at 2 is reproduced by a head trace corresponding to 16 times speed and 8 times speed for the data of data rate 1, and at the time of reproduction, the tape speed of reproduction is changed in accordance with each data rate as at the time of recording. It will be. In the 16 × speed reproduction in the case of the data rate 1, the head A traces 41, 45, 46, 44 in the 16 × speed area to obtain high speed reproduction data. When the data rate is ½, the head A can make 4 in the 16 × speed area.
2, 45 and 46, 43 are traced and reproduced as high speed reproduction data.

Therefore, the data rates 1 and 1/2
By arranging the data for high speed reproduction in the area traced by the head A at 16 times speed at 4 times speed at 4 times speed at each data rate and 1 at 1/4 speed at data rate.
In addition to 6x speed playback, 1 at data rate 1 and 1/2
It is possible to perform 6 × speed reproduction and reproduce the arranged high speed reproduction data. Then, the recording pattern is formed on the magnetic tape by repeatedly recording the four tracks shown in FIG. 14 as one unit. For example, data for 4 × speed may be repeatedly recorded twice, and data for 16 × speed may be repeatedly recorded 8 times.

FIG. 15 is a diagram showing 16 times speed reproduction with a drum structure of 1 ch × 2 on a track on which data having a data rate ratio of 1 or 1/2 is recorded in the second embodiment of the present invention. In the figure, the broken line arrow indicates 16 of data rate 1.
A double-speed trace is shown, and a solid arrow shows a 16-speed trace with a data rate of 1/2. Since the 16x speed data is recorded by the head of the azimuth A, in the case where the phase lock control is performed so that the head A traces as shown in FIG.
The high-speed reproduction data J1 to J4 in the 16x speed area traced by are reproduced. When the data rate is 1/2, the high speed reproduction data J5, J2 and J3, J6, and J7 to J10 in the 16x speed area traced by the head A are reproduced.

In FIG. 15, the head is 1 ch × 2.
However, the present invention is not limited to this, and the two types of heads of azimuths A and B are paired to form a 2ch × 1 drum configuration, or the heads are arranged in pairs and 2ch × 2 heads are arranged to face each other. In the case of the drum structure of No. 1 as well, since the area of high-speed reproduction data used at each rate and multiple speed uses the area traced by either head A or B, either head A or head B is the same as above. If the phase lock control is performed so as to be traced to, the data in the predetermined high-speed reproduction area is reproduced in the same manner as above. However, in the case of a 2ch × 2 drum structure, the double speed at the time of high-speed reproduction is 1ch × 2, 2c
This is a double speed number that is ½ of the double speed number in the case of the h × 1 configuration.

The bit stream recording / reproducing apparatus for arranging the high-speed reproduction data area on the track is shown in the same manner as in FIGS. 1 and 11 in the first embodiment, and the recording format circuit 11 in FIG. The print data is configured to have the data arrangement shown in FIG. The other recording operations are the same as in the first embodiment. Further, at the time of reproduction, the reproduction tape speed control circuit 33 reproduces at the time of reproduction on the basis of the signal indicating the rate ratio of the data rate from the data rate determination circuit 31 and the reproduction mode signal from the reproduction mode signal generation circuit 32. The tape speed is controlled. In the normal reproduction, the reproduction tape speed is 1 when the data rate is 1/2 as compared with the reproduction tape speed when the data rate is 1 in the normal reproduction.
If the data rate is 1/4, the reproduction tape speed is controlled to 1/4. Further, when performing 4 × speed reproduction and 16 × speed reproduction, the reproduction speed at the data rate of each bit stream is 2 × speed at 4 × speed at the data rate of 1 in comparison with the case of data at 1 × data rate. 1
The 6 × speed corresponds to the 8 × speed, the 4 × speed at the data rate ¼ corresponds to the 1 × speed, and the 16 × speed corresponds to the 4 × speed.

Then, in the data separation circuit 34, the data switching circuit 35 is separated into the normal reproduction data in the main area, the low speed double reproduction data in the low speed double area, and the high speed double reproduction data in the high speed double area. In the data switching circuit 35, the data of each area that has been output to a signal indicating the data rate of the reproduced data from the data rate determination circuit 31 and the reproduction mode signal generation circuit 32 are output.
The data is switched and selected based on the reproduction mode signal from and is sent to the output terminal 36. At the time of normal reproduction, a bit stream which is data for normal reproduction in the main area is selected at any data rate. At the time of high speed reproduction, data is selected by a reproduction mode signal indicating the data rate of reproduction data and low speed double (4 × speed) reproduction or high speed double (16 × speed) reproduction. At 4x speed at data rate 1, the low speed area is played back, so select low speed playback data, and at 16x speed the head A traces the high speed area and plays at high speed. Select the playback data. When the data rate is 1/2, the low speed area is played back at 4x speed, so the low speed data is selected. At 16x speed, the high speed area is played, so high speed playback is performed. Data for use. When the data rate is 1/4, the low speed double reproduction area is reproduced at the 4 × speed. Therefore, the low speed double reproduction data is selected. At the 16 × speed, the low speed double area is reproduced. Select double data.

As described above, at any data rate, the double speed number of the high speed reproduction is set so that the data for the high speed reproduction is arranged in the traced area when the high speed reproduction is performed at the same double speed. Specified, quadruple speed playback trace at data rate 1 and data rates 1 and 1/2
Since the high-speed reproduction data for 4x speed and 16x speed is arranged from the trace of 16x speed reproduction in, the data to be used is switched and selected based on the data rate of the reproduction data and the double speed number of reproduction. Even when a bit stream in which signals of different rates are multiplexed is recorded on a track at the same recording rate and high speed reproduction is performed, the data area for high speed reproduction is not provided for each data rate, and the data rate 1 , Data for high speed reproduction can be reproduced at low speed double reproduction (4 times speed) and high speed double reproduction (16 times speed) at 1/2, 1/4, high speed reproduction of the same double speed number, high speed reproduction Data can be played back reliably.

In the above embodiment, the case of the data rates 1, 1/2 and 1/4 is explained, but the value of the data rate is not limited to this, and other data rate ratios are used. Even at that data rate m
In the double-speed reproduction, if the head traces and reproduces the high-speed reproduction data by controlling the reproduction speed according to the data rate, the same effect as described above can be obtained.

Example 3. Another embodiment 3 of the arrangement on the track for recording the high-speed reproduction data area will be described. Similar to the first embodiment, the case where the data rate of the bit stream is 1, 1/2, 1/4 and the double speed number of high speed reproduction is 4 times as low speed double speed and 16 times as high speed double speed will be described. To do.

FIG. 16 is a diagram showing an example of head traces and reproducing areas of the heads A and B in the tracks on the tape at the time of 16x speed reproduction in the 2ch × 1 drum structure when the data rate ratio is 1 and 1/2. And more specifically, the arrangement of the heads on the rotating drum is 2 for azimuths A and B.
When two types of heads are paired and have a structure of 2 ch × 1, 16 times speed when the data rate of the bit stream is 1 and 16 times when the data rate is 1/2
The example of the head trace of azimuth A and B at the time of double speed is shown, and the trace in which the areas where the heads A and B trace overlap at the data rate 1 and 1/2 is shown is shown. There is. Also, if the tape speed is an integer multiple speed and the phase lock is controlled, head scanning is synchronized with the same azimuth track,
The position of the reproduced data is fixed. Ka in FIG. 16
1 to ka8 and kb1 to kb8 represent areas that can be reproduced at 16x speed at the data rate 1, ka9 to ka
12, the portion indicated by kb9 to kb12 is the data rate 1
It shows a reproducible area at 16x speed at / 2. FIG. 17 is a diagram showing the reproduction signal in the trace at each data rate in FIG. 16 and the reproducible area on the tracks A and B. The hatched portion in FIG. 17 is the reproducible area. From FIGS. 16 and 17, the overlapping areas that can be reproduced in common at 16 × speed reproduction at the data rate 1 and at 16 × speed reproduction at the data rate 1/2 are indicated by K1 and K2 on tracks A and B, respectively. It becomes a part. Also,
Track 16 for 16x speed playback at data rate 1
Since the head traces every 6 tracks, even when a high-speed playback area is placed on every 4 tracks, the entire area that is placed can be traced and played back at 16 times speed at a data rate of 1/2. In the case of reproduction, the trace corresponds to 8 × speed reproduction at the data rate 1, and the head traces every 8 tracks. Therefore, even when the high-speed reproduction area is arranged in every 4 tracks, the arrangement is the same. You can play all the areas you have created.

Therefore, the high-speed double recording area for recording the 16-times speed data is 16 areas in the areas K1 and K2 on the tracks A and B which are overlapping areas when the data rates are 1 and 1/2. Place a high-speed double area at double speed. It shows that at data rates 1 and 1
At 6 × speed, the data of the K1 and K2 areas arranged on the tracks A and B can be reproduced from the heads of azimuth A and B, and the data for high speed multiplication at 16 × speed can be obtained.

FIG. 18 shows an example in which the areas for high speed reproduction are arranged in the video area on the track of the home digital VTR as described above. In the figure, reference numeral 50 is a B for recording data at the time of quadruple speed reproduction by the azimuth B head.
Low speed doubling areas for trucks, 51a, 51b and 52
Reference numerals a and 52b are areas for high speed doubling of tracks A and B for recording data at 16x speed reproduction by the heads of azimuth A and B, and areas 50, 51a, b to 52a,
The video area other than b is used as a main area for recording a bit stream which is data for normal reproduction.
The low-speed double area is arranged in the same area as that of the first embodiment, and the description thereof is omitted.

In the quadruple speed reproduction, as in the case of the first and second embodiments, in the case of the data rate 1, the head B traces the quadruple speed area 50 to obtain the high speed reproduction data, and the data rate 1 In the case of / 2, the 4x speed reproduction is traced on the track at 2x speed, and the tracing of the head B at this time can be performed as shown in FIG. Is traced and used as high-speed playback data. When the data rate is 1/4, the quadruple speed reproduction is 1 on the track.
It is traced at double speed, so it is 1 by head A and B
6x speed area or 4x speed area 5 with head B
0 can be traced. At this time, for example, the quadruple speed area 50 by the head B is used as high speed reproduction data. Further, since the 16 × speed reproduction at the data rate ¼ is traced on the track at the 4 × speed, the 4 × speed area 50 by the head B is traced and reproduced as the high speed reproduction data. At this time, if the phase lock control is performed so that the head B traces the area for quadruple speed, 2 ch × 1
Even with this configuration, data for 4 × speed can be reproduced. The traces and operations during the 4 × speed reproduction at each data rate and the 16 × speed reproduction at the data rate ¼ are the same as those in the first embodiment, and therefore detailed description thereof will be omitted.

The 16 × speed operation for the data rates 1 and 1/2 will be described below. Data rate 1
Head traces at 16x speed at
As shown in FIG. 6, the reproduction speed at the data rate of 1/2 is reproduced by the head trace corresponding to the 8 × speed when the 16 × speed is the same as that of the data of the data rate 1. The tape speed for reproduction will be changed according to each data rate. In the 16x speed reproduction in the case of the data rate 1, the heads A and B trace 51a, b and 52a, b in the 16x speed area as high speed reproduction data, and even when the data rate is 1/2, 51 in the 16x speed area with heads A and B
Trace a and b and 52a and b, and reproduce as high speed reproduction data.

Therefore, the data rates 1 and 1/2
By arranging the data for high-speed reproduction in the overlapping area traced by the heads A and B at the 16-times speed in the above, in addition to the 4 times speed reproduction at each data rate and the 16 times speed reproduction at the data rate ¼, It is possible to perform the 16 × speed reproduction at the data rates 1 and 1/2 and reproduce the arranged high speed reproduction data. Then, the recording pattern is formed on the magnetic tape by repeatedly recording the four tracks shown in FIG. 18 as one unit. For example, data for 4 × speed may be repeatedly recorded twice, and data for 16 × speed may be repeatedly recorded 8 times.

FIG. 19 is a diagram showing 16 × speed reproduction with a 2 ch × 1 drum structure on a track on which data having a data rate ratio of 1 or 1/2 is recorded in the third embodiment of the present invention. In the figure, the broken line arrow indicates 16 of data rate 1.
A double-speed trace is shown, and a solid arrow shows a 16-speed trace with a data rate of 1/2. The phase lock control is performed so as to trace the high speed double area, and in the case of the data rate 1, the high speed reproduction data L1 to L4 of the 16 times high speed area arranged on the azimuth A and B tracks are reproduced. When the data rate is 1/2, the high-speed reproduction data L1 to L4 in the 16x speed area is used.
And L5 to L8 are reproduced.

In the above FIG. 15, the head is 2ch × 1.
It shows the case of the drum configuration of Azimuth A
Even in the case of a 2ch × 2 drum structure in which two types of heads, B and B, are arranged in pairs and face each other, the areas of high-speed reproduction data used at each rate and double speed are traced, so heads A and B If the phase lock control is performed so that either of the above is traced in the same manner as described above, the data in the predetermined high-speed reproduction area is reproduced in the same manner as described above, and the same effect is obtained. .

The bit stream recording / reproducing apparatus for arranging the data area for high speed reproduction on the above-mentioned track is shown in the same manner as in FIG. 1 and FIG. 11 in the first embodiment, and the recording formatting circuit 11 in FIG. The print data is configured to have the data arrangement shown in FIG. The other recording operations are the same as in the first embodiment. Further, at the time of reproduction, the reproduction tape speed control circuit 33 reproduces at the time of reproduction on the basis of the signal indicating the rate ratio of the data rate from the data rate determination circuit 31 and the reproduction mode signal from the reproduction mode signal generation circuit 32. The tape speed is controlled. In the normal reproduction, the reproduction tape speed is 1 when the data rate is 1/2 as compared with the reproduction tape speed when the data rate is 1 in the normal reproduction.
If the data rate is 1/4, the reproduction tape speed is controlled to 1/4. Further, when performing 4 × speed reproduction and 16 × speed reproduction, the reproduction speed at the data rate of each bit stream is 2 × speed at 4 × speed at the data rate of 1 in comparison with the case of data at 1 × data rate. 1
The 6 × speed corresponds to the 8 × speed, the 4 × speed at the data rate ¼ corresponds to the 1 × speed, and the 16 × speed corresponds to the 4 × speed.

Then, in the data separation circuit 34, the data switching circuit 35 is separated into the normal reproduction data in the main area, the low speed double reproduction data in the low speed double area and the high speed double reproduction data in the high speed double area. In the data switching circuit 35, the data of each area that has been output to a signal indicating the data rate of the reproduced data from the data rate determination circuit 31 and the reproduction mode signal generation circuit 32 are output.
The data is switched and selected based on the reproduction mode signal from and is sent to the output terminal 36. At the time of normal reproduction, a bit stream which is data for normal reproduction in the main area is selected at any data rate. At the time of high speed reproduction, data is selected by a reproduction mode signal indicating the data rate of reproduction data and low speed double (4 × speed) reproduction or high speed double (16 × speed) reproduction. When the data rate is 1, the low-speed area is reproduced at 4x speed, so the low-speed reproduction data is selected, and at 16x speed, the high-speed area traced by the heads A and B is reproduced. Select the high speed double playback data. When the data rate is 1/2, the low speed area is played back at 4x speed, so the low speed data is selected. At 16x speed, the high speed area is played, so high speed playback is performed. Data for use. When the data rate is 1/4, the low-speed double reproduction area is reproduced. Therefore, the low-speed double reproduction data is selected.
At double speed, the data in the low speed double area is played, so
Select low speed data.

As described above, the double speed number of the high speed reproduction is set so that the data for the high speed reproduction is arranged in the traced area when the high speed reproduction is performed at the same double speed at any data rate. Specified, quadruple speed playback trace at data rate 1 and data rate 1 and 1 /
Since the data for high speed reproduction for 4x speed and 16x speed is arranged from the trace of 16x speed reproduction in 2 and the data to be used is switched and selected from the data rate of the reproduction data and the double speed number of reproduction, Even when a bit stream in which different signals are multiplexed is recorded on a track at the same recording rate for high-speed reproduction, data rates of 1 and 1 are not provided for each high-speed reproduction data area. Data for high speed reproduction can be reproduced at low speed double reproduction (4 times speed) and high speed double reproduction (16 times speed) at / 2, 1/4, and high speed reproduction of the same double speed number can be performed. Data can be played back reliably.

In the above embodiment, the case where the data rates are 1, 1/2 and 1/4 is explained, but the value of the data rate is not limited to this, and the case of other data rate ratios. Even at that data rate m
In the double-speed reproduction, if the head traces and reproduces the high-speed reproduction data by controlling the reproduction speed according to the data rate, the same effect as described above can be obtained.

[0077]

According to the magnetic recording / reproducing apparatus of the first aspect of the present invention, the tape speed at the time of recording is controlled according to the data rate of the recording signal, and all kinds of data for recording the signal used for high speed reproduction are recorded. M-speed with a rate signal (| m |> 1)
In the case of high-speed reproduction, the head is arranged to record in a traceable and reproducible area for recording, and in the case of signals of all kinds of recorded data rates, when performing high-speed reproduction at the m times speed, a tape for reproduction based on the double speed number and the data rate. By controlling the speed and reproducing the signal for high speed reproduction arranged in the area on the track and obtaining the signal for high speed reproduction at each data rate, a bit stream in which signals with different data rates are multiplexed is recorded. Even when performing high-speed reproduction, the same high-speed reproduction is performed at any data rate, and high-speed reproduction data can be reliably obtained.

According to the second aspect of the magnetic recording / reproducing apparatus of the present invention, the data rate ratio r between the signals to be recorded is r.
Depending on (r is a positive number), the tape speed during recording is 1 / r
In addition, when performing the m-fold speed for each of the signals to be recorded, a signal for high-speed reproduction is provided in the area traced by the head when the tape speed for reproduction is reproduced at a speed corresponding to the m / r double speed. Since the data is arranged and recorded, even when recording a bitstream in which signals with different data rates are multiplexed on a track at the same recording rate and performing high-speed reproduction, a data area for high-speed reproduction to be arranged is set for each data rate. Without providing, high-speed reproduction of the same double speed number is performed at any data rate, and data for high-speed reproduction can be surely obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a configuration on a recording side for realizing a recording / reproducing apparatus of the present invention.

FIG. 2 is a diagram showing an example of a position of a head trace of a head B and a reproduction area in a track on a tape at the time of quadruple speed reproduction at a data rate ratio of 1.

FIG. 3 is a diagram showing an example of a position of a head trace of a head A and a reproduction area in a track on a tape at 16-times speed reproduction at a data rate ratio of 1.

FIG. 4 is a diagram showing an example of a track pattern in which a high-speed reproduction data area is arranged in an embodiment of the present invention.

FIG. 5 is a diagram showing an example of a position of a head trace of a head B and a reproduction area in a track on a tape at the time of quadruple speed reproduction at a data rate ratio of 1/2.

FIG. 6 is a data rate ratio 1 according to the first embodiment of the present invention.
FIG. 6 is a diagram when quadruple speed reproduction is performed on the track on which the data of 1 is recorded with a drum structure of 1 ch × 2.

FIG. 7 is a data rate ratio 1 according to the first embodiment of the present invention.
FIG. 6 is a diagram when 16 × speed reproduction is performed on a track on which the data of 1 is recorded with a drum configuration of 1 ch × 2.

FIG. 8 is a data rate ratio 1 in Example 1 of the present invention.
FIG. 9 is a diagram when quadruple speed reproduction is performed with a 1ch × 2 drum structure on a track on which data of / 2 is recorded.

FIG. 9 is a data rate ratio 1 according to the first embodiment of the present invention.
It is a figure at the time of quadruple speed reproduction | regeneration by the drum structure of 1chx2 on the track which recorded the data of / 4.

FIG. 10 is a diagram when 16-times speed reproduction is performed with a 1ch × 2 drum structure on a track on which data having a data rate ratio of 1/4 is recorded in Example 1 of the present invention.

FIG. 11 is a diagram showing a configuration on the reproducing side for realizing the recording / reproducing apparatus of the present invention.

FIG. 12 is a diagram showing an example of a head trace of a head A and a reproduction area in a track on a tape at 16 × speed reproduction at a data rate ratio of 1 and 1/2.

FIG. 13 is a diagram showing an example of a reproduction signal and a reproducible area by the head A at the time of 16 × speed reproduction at a data rate ratio of 1 and 1/2.

FIG. 14 is a diagram showing an example of a track pattern in which a high-speed reproduction data area is arranged in Example 2 of the present invention.

FIG. 15 shows 1 ch on a track on which data having a data rate ratio of 1 or 1/2 is recorded in Example 2 of the present invention.
It is a figure at the time of 16-times speed reproduction with the drum composition of x2.

FIG. 16 is 2 when the data rate ratio is 1 and 1/2
FIG. 3 is a diagram showing an example of head traces and reproduction areas of heads A and B in a track on a tape at the time of 16 × speed reproduction in a ch × 1 drum structure.

17 is a diagram showing a reproduced signal in a trace and a reproducible area on tracks A and B at each data rate in FIG.

FIG. 18 is a diagram showing an example of a track pattern in which a high-speed reproduction data area is arranged in Example 3 of the present invention.

FIG. 19 shows 2 ch on a track on which data having a data rate ratio of 1 or 1/2 is recorded in Example 3 of the present invention.
It is a figure at the time of 16x speed reproduction by the drum composition of x1.

FIG. 20 is a diagram showing a track in a general home digital VTR.

FIG. 21 is a head trace diagram during normal reproduction and high-speed reproduction in the digital VTR.

[Fig. 22] Fig. 22 is a diagram illustrating the configuration on the recording side of a bitstream recording / reproducing device capable of high-speed reproduction.

[Fig. 23] Fig. 23 is a diagram showing the structure on the reproducing side in a conventional bitstream recording / reproducing device.

FIG. 24 is a diagram showing an example of a head trace during high-speed reproduction at 9 × speed.

FIG. 25 is a diagram showing an example of three tape speed scan areas in which heads are synchronized with the same azimuth track.

FIG. 26 is a diagram showing examples of head traces at different tape speeds.

FIG. 27 is a diagram showing a head trace at 5 × speed.

FIG. 28 is a diagram showing an example of arrangement of a main area and a copy area.

[Explanation of symbols]

11 recording data formatting circuit, 12 timing signal generating circuit, 14 variable length decoder, 15 counter,
16 data extraction circuit, 17 EOB addition circuit, 1
8 data rate detection circuit, 19 tape speed control circuit, 20, 40, 50 low speed reproduction area, 21-2
4, 41-46, 51a, b, 52a, b high-speed double area, 31 data rate discrimination circuit, 32 reproduction mode signal generation circuit, 33 reproduction tape speed control circuit, 34 data separation circuit, 35 data switching circuit.

Claims (2)

[Claims] 1. A device for recording / reproducing a signal having a different data rate on an inclined track formed on a surface of a magnetic tape by a rotating drum having a head mounted thereon, and means for extracting a signal used for high-speed reproduction from a normal recording signal, and a signal. Means for controlling the tape speed at the time of recording according to the data rate, and the head traces the high-speed reproduction at m times speed (| m |> 1) high-speed reproduction at the signals of all kinds of data rates to be recorded. And has a means for arranging and recording in a reproducible area and controlling the tape speed of reproduction based on the number of double speeds and the data rate when performing high-speed reproduction at the m-times speed for all kinds of recorded data rate signals. Means for reproducing high-speed reproduction signals arranged in the area on the track to obtain high-speed reproduction signals at each data rate. A magnetic recording / reproducing apparatus characterized in that 2. A data rate ratio r between the signals to be recorded
Depending on (r is a positive number), the tape speed during recording is 1 / r
And a signal for high-speed reproduction in an area traced by the head when the tape speed for reproduction is reproduced at a speed corresponding to m / r times when performing m-times speed for each of the signals to be recorded. 2. The magnetic recording / reproducing apparatus according to claim 1, further comprising: