JPH06236506A - Reproducing device of non-tracking system - Google Patents

Abstract

PURPOSE:To enable the good execution of reproduction at a tape speed of two-fold the ordinary tape speed with recording the reproducing device of a non-tracking system which scans tracks at density of two-fold the density at the time of recording with a rotary head. CONSTITUTION:Signals of one track are divided to plural blocks and are recorded in the oblique recording tracks of a magnetic tape 2 and track addresses and block addresses are recorded in each of the respective blocks. The rotary head device has rotary heads 14A, 14A' of a first azimuth which are disposed adjacent to each other at a level difference of one track pitch and rotary heads 14B, 14B' of a second azimuth which are disposed adjacent to each other at a level difference of one track pitch, apart respective spacings of 180 deg. from each other. The recording tracks scanned at the density of two-fold the density at the time of recording with the heads 14A, 14A', 14B, 14B' when the traveling speed of a tape 2 is set at two-fold the traveling speed of the ordinary time. The reproduced signals are rearranged in accordance with the track addresses and block addresses, by which the signals of the respective tracks are obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-tracking type reproducing apparatus which scans a recording track with a rotary head at a density twice as high as that at the time of recording.

[0002]

2. Description of the Related Art Conventionally, as for a non-tracking type recording / reproducing apparatus, for example, "Nikkei Electronics" 19
92.3.30 (no. 550) p. 133-161
Etc.

The outline of this digital recording / reproducing apparatus will be described. FIG. 6 shows a rotary head device. Reference numeral 1 denotes a tape guide drum, on which a magnetic tape 2 is obliquely wound in an angular range of about 100 degrees. Further, 3A, 3B and 3A 'are rotary magnetic heads. The heads 3A and 3A 'have the same azimuth, the heads 3A, 3A' and 3B have different azimuths, and the heads 3A and 3B are so-called double azimuth heads.

In such a rotary head device, at the time of recording, the heads 3A and 3B are alternately used every one rotation, and inclined recording tracks TA and TB are sequentially formed on the magnetic tape 2 as shown in FIG. To be done. In this case, each inclined track TA, TB is formed by supplying a recording signal to the heads 3A, 3B during a 90 ° angular range in which the heads 3A, 3B scan the magnetic tape 2. Then, the signal of one track is divided into a plurality of blocks and recorded, and
A track address and a block address are recorded for each block.

Also, during reproduction, the head 3 is used for each rotation.
Since both A'and 3B are used, even if the rotation speed is the same during recording and reproduction, double density scanning is performed during reproduction. FIG. 7 shows the scanning loci of the heads 3A 'and 3B.

FIG. 8 shows the circuit configuration of the reproducing system.
Reproduction signal S output from heads 3A 'and 3B during reproduction
3A and S3B (shown in FIGS. 9A and 9B) are supplied to the fixed terminals on the a side and the b side of the changeover switch 5 via the reproduction amplifiers 4A and 4B, respectively. The changeover switch 5 is connected to the a side while the head 3A 'scans the magnetic tape 2, and is connected to the b side while the head 3B scans the magnetic tape 2.

The reproduction signal (shown in FIG. 9C) output from the changeover switch 5 is supplied to the reproduction signal processing circuit 8 via the amplifier 6 and the reproduction equalizer 7. In the processing circuit 8,
After the reproduction signal is demodulated, the data of each block is sequentially written into a predetermined address of the buffer memory corresponding to the track address and the block address, whereby the signal of each track is obtained. Then, the reproduction data of each track read from the buffer memory is subjected to error correction processing and output.

As described above, the heads 3A 'and 3B scan the recording tracks TA and TB at a double density during reproduction, and the processing circuit 8 reconstructs the signal of each track based on the track address and the block address. Head 3
A'and 3B do not need to faithfully trace (track) the recording tracks TA and TB, respectively.

By the way, the tape running speed at the time of reproduction by the above-mentioned non-tracking type digital recording / reproducing apparatus is doubled at the normal time, and the reproducing time is set to 1 by using the rotary head device as shown in FIG. It is possible to set it to / 2. 10, parts corresponding to those in FIG. 6 are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 10, again, 9A, 9B, 9
A'and 9B 'are rotary magnetic heads arranged at angular intervals of 90 °. In this head configuration, the head 9
A and 9A 'are the same azimuth and heads 9B and 9A
B'is the same azimuth, but heads 9A, 9A 'and 9'
Azimuth different from B and 9B '.

In such a rotary head device, when the tape running speed is twice as high as the normal speed, the heads 9A, 9
Even if the rotational speeds of B, 9A 'and 9B' are the same as in the normal state, the scanning of the recording tracks TA and TB by the heads 9A, 9B, 9A 'and 9B' is twice as fast as the recording.

FIG. 11 shows the circuit structure of the reproducing system, which reproduces the reproduction signals S9A, S9A, 9A 'from the heads 9A, 9A'.
S9A '(shown in FIGS. 12A and 12B) is a side of the changeover switch 11A via reproduction amplifiers 10A and 10A',
It is supplied to the fixed terminal on the b side. The changeover switch 11A is
The head 9A is connected to the side a while the magnetic tape 2 is scanned, while the head 9A 'is connected to the side b while the magnetic tape 2 is scanned. The output signal of the changeover switch 11A is connected to the fixed terminal on the side a of the changeover switch 12.

The reproduction signals S9B and S9B '(shown in FIGS. 12C and 12D) output from the heads 9B and 9B' are shown on the side a and the side b of the changeover switch 11B via the reproduction amplifiers 10B and 10B ', respectively. Supplied to fixed terminals. The changeover switch 11B is connected to the side a while the head 9B scans the magnetic tape 2, while the head 9B 'is connected to the magnetic tape 2.
Is connected to the side b during the scanning. The output signal of the changeover switch 11B is connected to the fixed terminal on the b side of the changeover switch 12.

The changeover switch 12 includes heads 9A and 9A '.
Is connected to the side a during scanning of the magnetic tape 2, while b is scanned during scanning of the magnetic tape 2 by the heads 9B and 9B '.
Connected to the side. The reproduction signal (illustrated in FIG. 12E) output from the changeover switch 12 is supplied to the amplifier 6 and the reproduction equalizer 7.
It is supplied to the reproduction signal processing circuit 8 via and the reproduction data of each track is output.

[0015]

When the tape running speed is doubled, by using the rotary head device as shown in FIG. 10, theoretically, at a density twice as high as that at the time of recording, as described above. Although the recording tracks TA and TB can be scanned, since the heads 9A and 9A 'or the heads 9B and 9B' are arranged separately, it is difficult to perform pairing between the respective heads, and recording There is a possibility that the recording tracks TA and TB cannot be accurately scanned at a density twice as high as that at the time.

Therefore, the present invention is a non-tracking type reproducing apparatus which scans a recording track with a rotary head at a density twice as high as that at the time of recording, and the rotary head is used even when the tape speed is twice as high as usual. Therefore, the recording track can be scanned at a density twice as high as that at the time of recording.

[0017]

According to the present invention, a signal of one track is divided into a plurality of blocks and recorded, and a track address and a block address for each block are recorded on a recording track on a tape. In a non-tracking reproducing apparatus that scans with a rotary head at twice the density at the time of recording, the first and second rotary heads having the first azimuth are arranged adjacent to each other with a step difference of 1 track pitch. Third and fourth rotary heads having a second azimuth are arranged adjacent to each other with a step difference of 1 track pitch, and the first and second rotary heads and the third and fourth rotary heads are substantially 1 each other.
It is equipped with a rotary head device arranged at an angular interval of 80 °, and when the traveling speed of the tape is doubled at the normal time, the first
The reproduced signal from the fourth rotary head is rearranged based on the track address and the block address to obtain the signal of each track.

[0018]

According to the present invention, when the running speed of the tape is doubled at the normal time, the first and second rotary heads 9A and 9A ', the third and the second rotary heads which are adjacently arranged with a step difference of 1 track pitch. Fourth rotating head 9B and 9
Since the recording tracks TA and TB are scanned at B ', it is possible to scan the recording tracks at a density twice as high as that at the time of recording even if the tape running speed is twice as fast as the normal time.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a rotary head device in this example. In FIG. 1, parts corresponding to those in FIG. 6 are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, 14A, 14A ', 14
B and 14B 'are rotary magnetic heads. The heads 14A and 14A 'are arranged adjacent to each other, and the head 14
B and 14B 'are arranged adjacent to each other. Head 14
A, 14A 'and heads 14B, 14B' are approximately 1 each other.
They are arranged at angular intervals of 80 ° and have different azimuths. Further, the heads 14A and 14A 'are arranged so as to have a step difference by being shifted by one track pitch TP in the axial direction as shown in FIG. Head 1
4B and 14B 'also have one track pitch TP in the axial direction.
They are arranged so that they are staggered and have a step.

In such a rotary head device, when the tape running speed is twice as high as the normal speed, the head 14A,
Even if the rotational speeds of 14A ', 14B, 14B' are the same as in the normal state, the heads 14A, 14A ', 14B, 14
The scanning of the recording tracks TA and TB by B'has a density twice as high as that at the time of recording as shown in FIG.

In this case, since the heads 14A and 14A 'are arranged adjacent to each other, the heads 14A and 1A are
4A ′ can be accurately displaced in the axial direction by one track pitch TP. This is heads 14B and 14
The same applies to B '. Therefore, unlike the case where the rotary head device is configured as in the example of FIG. 10, the pairing between the heads cannot be completely removed, and the scanning cannot be performed accurately at twice the density at the time of recording.

Although not described above, the scanning at twice the density at the time of recording is scanning of the recording track TA by the heads 14A and 14A 'and scanning by the recording track TB by the heads 14B and 14B'. Therefore, the head 14
The scanning trajectories of B and 14B 'do not have to pass through the centers of the scanning trajectories of the heads 14A and 14A', and in extreme cases, both scanning trajectories may completely overlap. In other words, the head 14
It is not necessary to perform pairing between A, 14A 'and heads 14B, 14B'.

FIG. 4 shows the circuit structure of the reproducing system.
4, parts corresponding to those in FIG. 8 are designated by the same reference numerals, and detailed description thereof will be omitted.

The reproduction signals S14A and S14B output from the heads 14A and 14B (shown in FIGS. 5A and 5B) are supplied to the selector switch 16a via reproduction amplifiers 15A and 15B, respectively.
Side and b side fixed terminals. Changeover switch 16
Is connected to the side a while the head 14A scans the magnetic tape 2, while it is connected to the side b while the head 14B scans the magnetic tape 2. The output signal of the changeover switch 16 (shown in FIG. 5C) is supplied to the amplifier 18 and the reproduction equalizer 2.
It is supplied to the fixed terminal on the a side of the changeover switch 23 through the series circuit of the 0 and 90 ° delay circuits 22 (shown in FIG. 5D).

The reproduction signals S14A 'and S14B' (shown in FIGS. 5E and 5F) output from the heads 14A 'and 14B' are shown on the a side of the changeover switch 17 via reproduction amplifiers 15A 'and 15B', respectively. It is supplied to the fixed terminal on the b side. The changeover switch 17 is changed over in conjunction with the changeover switch 16, and is connected to the side a while the head 14A 'scans the magnetic tape 2 and is connected to the side b while the head 14B' scans the magnetic tape 2. It The output signal of the changeover switch 17 (illustrated in FIG. 5G) is supplied to the fixed terminal on the b side of the changeover switch 23 via the series circuit 23 of the amplifier 19 and the reproduction equalizer 21.

The changeover switch 23 is for the heads 14A ', 1
4B 'is connected to the side b during scanning of the magnetic tape 2, while these heads 14A' and 14B are connected to the magnetic tape 2
Is connected to the side a during the period when scanning is not performed. Changeover switch 2
The reproduction signal (illustrated in FIG. 5H) output from the No. 3 is supplied to the reproduction signal processing circuit 8 and the reproduction data of each track is output.

[0028]

According to the present invention, when the running speed of the tape is doubled at the normal time, the recording tracks are scanned by the first and second rotary heads which are arranged adjacent to each other with a step difference of one track pitch. Therefore, the recording track can be scanned at a density twice as high as that at the time of recording, and thereby, good reproduction can be performed at a tape speed twice as high as usual.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a rotary head device according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining the arrangement of heads.

FIG. 3 is a diagram showing a recording track and a head scanning locus during reproduction according to an embodiment of the present invention.

FIG. 4 is a block diagram showing a circuit configuration of a reproducing system in an embodiment of the present invention.

FIG. 5 is a diagram showing signals of respective parts in the example of FIG.

FIG. 6 is a diagram showing a configuration of a rotary head device in a conventional non-tracking type digital recording / reproducing apparatus.

FIG. 7 is a diagram showing a recording track in a conventional non-tracking type digital recording / reproducing apparatus and a head scanning locus during reproduction.

FIG. 8 is a block diagram showing a circuit configuration of a reproducing system of a conventional non-tracking type digital recording / reproducing apparatus.

9 is a diagram showing signals of respective parts in the example of FIG.

FIG. 10 is a diagram showing a configuration of an example of a rotary head device.

11 is a block diagram showing a circuit configuration of a reproducing system when the rotary head device of the example of FIG. 10 is used.

FIG. 12 is a diagram showing signals of respective parts in the example of FIG. 11.

[Explanation of symbols]

 1 tape guide drum 2 magnetic tape 8 reproduction signal processing circuit 14A, 14A ', 14B, 14B' rotary magnetic head 15A, 15A ', 15B, 15B' reproduction amplifier 16, 17, 23 changeover switch 20, 21 reproduction equalizer 22 Delay circuit

Claims (1)

[Claims] 1. A 1-track signal is divided into a plurality of blocks for recording, and each recording track on the tape on which a track address and a block address are recorded for each block is recorded by a rotary head at the time of recording. In a non-tracking type reproducing apparatus which scans at double density, first and second rotary heads having a first azimuth are arranged adjacent to each other with a step difference of 1 track pitch, and a third azimuth having a second azimuth is provided. And the fourth rotary head is arranged adjacent to each other with a step difference of 1 track pitch, and the first and second rotary heads and the third and fourth rotary heads are arranged at an angular interval of approximately 180 ° from each other. When the traveling speed of the tape is doubled at the normal time, the reproduction signal from the first to fourth rotary heads is provided. The reproducing apparatus of non-tracking system, characterized in that to obtain a signal of each track rearranged based on the track address and the block address.