JPH087240A - Recording/reproducing device - Google Patents

Abstract

PURPOSE:To improve the chracteristics of a signal passing through a rotary transformer by providing a pair of recording heads and a pair of reproducing heads so as to oppose to each other respectively by 180 deg. for a rotary drum. CONSTITUTION:A pair of recordin<j heads AREC, BREC are provided with azimuth angles (e.g. +20 deg. and -20 deg.) different from each other. These recording heads ARRECc, BREC, are confronted vi' each other at the angle 180 deg. respectively, and are arranged so that both heads become the same height as e.g. a drum reference surface. Thus, though the continuity of transmission of information between respective channels is lost, since the recording infofmation is made a digital signal, it is reproduced as the continuous information by a signal process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing device and a recording / reproducing device which can be used for both recording and reproducing. The present invention relates to a recording / reproducing apparatus capable of recording and reproducing, etc. as digital signals.

[0002]

2. Description of the Related Art A device (VTR) that records and reproduces digital information obtained by converting a color video signal or a color television signal into a digital signal on a magnetic tape has been widely used as a commercial device. Such a digital V
TR is a VTR that records and reproduces conventional analog signals
It is superior in terms of editing operations and C / S compared to the above, and in particular there is no deterioration in image quality even after repeated dubbing and recording / recording.
It has an excellent advantage that the recording / reproducing characteristics hardly change due to the physical characteristics of the reproducing system.

Generally, in order to record a color video signal as it is on a digital VTR and maintain high image quality, high-density recording and a high data transfer rate are required as compared with an analog VTR, so long-term recording is required. In this case, the amount of tape used is remarkably increased, which makes it difficult to downsize the VTR. Therefore, in recent years, it is necessary to compress image data and audio data converted into digital data by a highly integrated IC circuit, which is being developed, by a predetermined method, and perform encoding to reduce an error rate during recording and reproduction. Proposed a signal processing and recording format that allows the use of a small cassette similar to the current home VTR, and magnetic recording that allows digital data itself to be commonly used for various standard TV signals. The standard of the reproduction method is being recommended.

By the way, in a general VTR, a so-called rotary head having a rotary drum provided with a recording / reproducing head is used to record / reproduce information on / from a magnetic tape by a helical scan method. There is.
For example, FIG. 9 shows an example of a rotary head used for a VTR.
A pair of recording heads A _REC and B _REC and a pair of reproducing heads A _PB and B _PB are provided. The recording heads A _REC and B _REC are arranged to face each other at an angle of 180 °, and the reproducing heads A _PB and B _PB are also arranged to face each other at an angle of 180 ° and rotate. The head is constructed. Since the magnetic tape T that contacts the rotary head is of the helical scan type, it actually has a predetermined tape angle with respect to the rotating surface of the drum. The winding angle of the magnetic tape T is 180 ° or more.

FIG. 10 is an explanatory diagram showing a connection form from the rotary head having the above structure to the recording / reproducing amplifier. In this figure, RT _{1 to} RT ₄ represent rotary transformers provided in channels 1 to 4, respectively.
Reference numerals 21a and 21b denote recording amplifiers, and 31a and 31b denote reproduction amplifiers. Then, recording head A _REC is rotary transformer RT ₁ arranged in one channel is connected, is connected further the rotary transformer RT ₁ in the recording amplifier 21a. In addition, the reproducing head A _PB is connected to a reproducing amplifier 31 via a 2-channel rotary transformer RT _2.
The recording head B _REC is connected to the recording amplifier 21b via the 3-channel rotary transformer RT ₃ and the reproducing head B _PB is connected to the reproducing 31b via the 4-channel rotary transformer RT ₄ . In addition, SR indicates a short ring, and in reality, the recording heads A _REC and B _REC are provided between 1 channel and 3 channels, and the reproducing heads A _PB and B _PB are provided between 2 channels and 4 channels. It is provided. As a result, even if a recording (or reproducing) operation based on the timing described below is performed, it is possible to prevent crosstalk that occurs between channels of the rotary transformer during recording and reproducing.

FIG. 11 shows the circuit shown in FIG. 9 and FIG.
For the VTR of the connection configuration of the rotary head and each recording / playback head
It is explanatory drawing which shows the recording timing in. Rotating drum
The winding angle of the magnetic tape T with respect to 1 is 180 ° or more
(See Fig. 9)
Recording head A to roll_REC , B_REC To the magnetic tape
As shown in Fig. 11 (a),
The recording head A_REC Winding over 180 ° by
Approximately 1/2 period of the rotation cycle of the rotating drum 1 before and after the angle
Thus, a recording section that is over is formed. Soshi
Then, as shown in FIG. 11B, the recording head B_REC 
Similarly, 1/2 period of the rotation cycle of the rotating drum 1
The recording section is formed so that
The recording operation of is repeated. This recording method
According to the law, recording head A_REC And B_REC At the same time
There will be a period of contact with T
Overlap section t where the recording sections in the figure overlap_ORAs raw
It will be messed up. Then, this overlap section t_OR
By providing the, the continuity of recorded information is secured.
I am trying. Note that during playback,
Recording head A depending on timing_REC , B _REC Each of
Playback head A_PB, B_PBEach of
Since it will be reproduced by
Overlap that overlaps the playback section even during playback
Up section t_ORWill occur. Record and above
And each channel of the rotary transformer at the playback timing.
Between windings, there is an overlap area during recording and playback.
There will be crosstalk between them, but in reality
Providing a short ring SR as shown in FIG.
To prevent this crosstalk and perform proper recording / playback.
I am trying to do it.

[0007]

By the way, a rotary transformer is wound around a circular groove provided corresponding to each channel. Due to such a structure, the groove is formed in order to insert the short ring. Need to add. That is, providing the short ring increases the number of grooves in the rotary transformer. For example, the configuration shown in FIG. 10 has a five-groove four-channel configuration in which one groove corresponding to the short ring SR is added to four grooves corresponding to the rotary transformer for four channels. However, there are restrictions on the outer shape and inner diameter of the rotary transformer, and as the number of grooves increases, the facing area of the stator side and rotor side windings of the rotary transformer in each channel becomes smaller, and the coupling coefficient and inductance of the rotary transformer become smaller. Characteristics are deteriorated and S
There is a problem that the / N ratio and the like are adversely affected.
In addition, the overlap section T without the short ring
_When trying to solve the problem of _OR , the recording head A _REC ,
Recording amplifier 2 so that the recording sections by B _REC do not overlap
It is necessary to perform control such as controlling the on / off timing of the outputs of 1a and 21b, which complicates the design of the device.

Further, in the case of the connection structure as shown in FIG. 10, since the recording amplifier and the reproducing amplifier are connected to correspond to each of the four recording heads of the two recording heads and the two reproducing heads, Although four systems of recording and reproducing amplifiers are required, it is preferable that such a signal system is as simple as possible from the viewpoint of cost and the like.

[0009]

In order to solve the above-mentioned problems, the present invention is capable of recording / reproducing on / from a tape-shaped recording medium wound on a rotary drum.
In the reproducing apparatus, a pair of recording heads and a pair of reproducing heads are provided on the rotating drum so as to face each other by 180 °, and, for example, the winding angle of the tape-shaped recording medium with respect to the rotating drum is set. By making the angle smaller than 180 °, the recording sections by the pair of recording heads are configured not to overlap. Accordingly, the short ring inserted between the channels of the rotary transformer corresponding to the pair of recording heads and the pair of reproducing heads is omitted. The pair of recording heads and the pair of reproducing heads are connected so as to alternately correspond to the channel order of the rotary transformer, or the pair of recording heads and the pair of recording heads are connected to the channel order of the rotary transformer. It was decided to connect the playback heads of the above so as to correspond to the adjacent channels. The recording system is configured so that the output of one recording amplifier is supplied in parallel to two rotary transformers provided corresponding to one pair of recording heads, or one pair. The recording heads of (1) and (2) are connected to one rotary transformer in parallel or in series. Further, as the structure of the reproducing system, the outputs of the two rotary transformers corresponding to the pair of reproducing heads are selectively switched by a switch at a predetermined timing and output to one reproducing amplifier. I decided. Further, in addition to the structure described above, an erasing head is provided on the rotary drum, and a rotary transformer of a channel corresponding to this erasing head and a channel corresponding to a pair of recording heads and a pair of reproducing heads are provided. It was decided to insert a short ring between them.

[0010]

A pair of recording heads and a pair of reproducing heads are provided on the rotating drum so as to face each other by 180 °, and the winding angle of the magnetic tape is 180 °.
By making the size smaller, the pair of recording heads or the pair of reproducing heads will not contact the magnetic tape at the same time during recording and reproducing. As a result, the continuity of information transmission between the channels is lost, but since the recorded information is a digital signal, it can be reproduced as continuous information by signal processing. By doing so, it is possible to omit the short ring between the channels of the pair of recording heads and the pair of reproducing heads facing each other at 180 °, and to reduce the grooves of the rotary transformer accordingly. Become. Further, at this time, a pair of recording heads and a pair of reproducing heads are connected to a rotary transformer corresponding to an alternate channel order, or a pair of recording heads and a pair of reproducing heads are arranged in the channel order of the rotary transformer. It can be changed according to the conditions such as connecting to a rotary transformer corresponding to each adjacent channel.

Further, with the above configuration, it is possible to perform recording while constantly supplying the same signal to the pair of recording heads during recording, for example. Therefore, by connecting the output of one recording amplifier in parallel to the rotary transformers of two channels corresponding to a pair of recording heads, the recording amplifier side can be made into one system. Alternatively, by connecting a pair of recording heads in parallel or in series to a rotary transformer of one channel, it is possible to make one recording amplifier and one rotary transformer corresponding to recording.

Further, a changeover switch capable of selectively changing the outputs of the rotary transformers of the two channels corresponding to the pair of reproduction heads at a predetermined timing is provided, and the output of the changeover switch is supplied to one reproduction amplifier. The reproduction amplifier can be made into one system by connecting so as to input. In each of the above configurations, an erasing head is provided on the rotary drum, and one short ring is provided between the rotary transformer of the channel corresponding to the erasing head and the channel corresponding to the recording head and the reproducing head. By inserting, it becomes possible to easily use the erasing head as a rotary head.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS.
A digital VTR, which is an example of a reproducing apparatus, will be described. FIG. 1 shows an example of a rotary head used in the digital VTR of this embodiment.
_REC and B _REC indicate a pair of recording heads and have different azimuth angles (for example, + 20 ° and −20 °). The recording heads A _REC and B _REC face each other at an angle of 180 °, and are arranged so that they have the same height with respect to the drum reference plane, for example. A _PB and B _PB represent a pair of reproducing heads, which have different azimuth angles (+ 20 ° and -2) like the recording heads.
0 °). The reproducing heads A _PB and B _PB are also arranged so as to face each other at an angle of 180 ° and have the same height with respect to the drum reference surface. The head is constructed.

In this figure, the recording head A
The angles between _REC and B _REC and the playback heads A _PB and B _PB are approximately 9
Although shown as 0 °, it is not necessarily limited to this, and it is sufficient that the recording head and the reproducing head face each other at an angle of 180 °. Then, the magnetic tape T that contacts the rotary head
Is a helical scan method, so that it has a predetermined tape angle with respect to the rotating surface of the drum. Further, the winding angle (indicated by θ) of the magnetic tape T in the case of the present embodiment is set to be smaller than 180 ° as can be seen from the figure.

FIG. 2 shows an example of the connection form from the rotary head to the recording and reproducing amplifier having the above structure. The same parts as those in FIG. 10 are designated by the same reference numerals and the description thereof will be omitted. In the case of this figure, rotary transformers RT _{1 to} RT 4 for channels _{1 to 4} are provided. When the rotary transformer has a cylindrical structure, the channels are arranged in order from the upper side to 1 to 4 channels, and in the case of the flat type, the channels are arranged from the outer side to the 1 to 4 channels. In addition, the recording amplifiers 21a, 21
b and reproduction amplifiers 31a and 31b are provided in total.

The recording head A _REC is connected to the recording amplifier 21a via a rotary transformer RT ₁ arranged on one channel. In addition, the reproducing head A _PB is connected to a reproducing amplifier 3 via a 2-channel rotary transformer RT _2.
1a, the recording head B _REC is connected to the recording amplifier 21b via a 3-channel rotary transformer RT ₃ , and the reproducing head B _PB is connected to a reproducing amplifier 31b via a 4-channel rotary transformer RT ₄ .
That is, the recording amplifier and the reproducing amplifier are connected to the rotary transformer side so as to correspond to the alternate channel order. Further, in this embodiment, the short ring is not provided, so in this case, the four grooves 4 are used.
It is a rotary transformer with a channel structure. The same _applies when the recording heads A _REC and B _REC corresponding to channels 1 and 3 are interchanged, and the reproducing heads A _PB and B _PB corresponding to channels 2 and 4 are interchanged. It can be configured.

FIG. 3 is a block diagram schematically showing a main part of a digital VTR which can be constructed by including the rotary head and the rotary transformer as shown in FIGS. 1 and 2, and in this case. The recording system and the reproducing system are shown separately. In the recording system of this figure, the video signal SD supplied at the time of recording is supplied as a luminance signal component Y and color difference signal components RY and BY, respectively, and these signals are predetermined by an input signal processing circuit (not shown). The image quality is adjusted and various kinds of signal processing are performed by sampling at the clock frequency of.

Then, the digital video signal SD is first input to a blocking circuit (BLK) 11, where pixels are exchanged within a scanning line, an ID code is added, and a block is formed in a predetermined order. The framing circuit 12 compresses the data on the time axis and converts the data into frame-structured data. The output of the data compression / framing circuit 12 is the shuffling circuits 13a and 13
It is branched and input to b, and shuffling of the data code is performed here. This shuffling circuit 13a, 13b
Various control data is added from the microcomputer 15 to the video data output from the microcomputer 15. That is, the system control data circuit 16 adds the control signal composed of the input data to the adding circuits 17a and 17b.
Similarly, the output data is added to the output data of the shuffling circuits 13a and 13b via the addition circuits 18a and 18b. Further, the audio signal accompanying the video signal is transmitted from the audio data processing circuit 14 via the adding circuits 17a and 17b,
Similarly, the data is branched and added to the output data of the shuffling circuits 13a and 13b, and the error correction signal providing circuit (ECC) 19 is arranged in an array based on the data pattern of a predetermined track.
a, 19b. The data to which, for example, external and internal error correction signals have been added by the error correction signal addition circuits (ECC) 19a and 19b is the coding circuit 2
At 0a and 20b, the code is converted into a code suitable for the characteristics of the recording / reproducing system. Then, each coding circuit 20a, 20
The data signals output from b are recorded amplifiers 2 respectively.
1a and 21b, and further recording heads A _REC and B via rotary transformers RT ₁ and RT _2.
Supplied to _REC . In the recording heads A _REC and B _REC , the supplied data is recorded as a magnetic signal so that, for example, a signal of one frame becomes 10 recording tracks on a track formed in a diagonal direction of a magnetic tape (not shown). I will go.

Next, in the reproducing system of FIG. 3, the reproducing head A
_The data signals reproduced from the magnetic tapes (not shown) by _PB and B _PB are the rotary transformer R respectively.
Reproducing amplifier 31a via the T _3, RT _4, is supplied to 31b, it is supplied further decoding circuit 32a, the 33b. The reproduction data decoded by the decoding circuits 32a and 32b are subjected to error detection and correction during recording and reproduction by error correction circuits (ECC) 33a and 33b, respectively, and reproduction data generated due to uneven rotation of the rotating drum. Is supplied to time base correct circuits (TBC) 34a and 34b for removing the jitter.
The reproduction data whose time axis has been corrected via the time base correct circuits 34a and 34b is the control data in the data, which is taken in by the reproduction system control unit 38, and the mode data at the time of recording and various data for performing reproduction processing. Is extracted.

The time base collect circuit 34a,
Of the data output from 34b, the data recorded in the audio area of the reproduction data is detected as an audio data signal by the audio signal processing circuits 41a and 41b, and the required processing is performed. And is converted into an audio signal. Further, the data recorded in the video area is supplied to the deshuffling circuits 35a, 35b, where the shuffled data is restored to the original video data and supplied to the decompression circuit 36, respectively. The decompression circuit 36 interpolates the time-compressed data at the time of recording and supplies it to the deblocking circuit 37. A digital video signal S composed of a luminance signal component Y, color difference signal components RY and BY, using the data having a block structure at the time of recording as an original data series.
Output as D. The digital video signal SD is subjected to predetermined image quality adjustment and synchronization signal addition processing by a circuit (not shown) in the subsequent stage, and is returned to the original video signal at the time of recording.

Next, the digital VT of this embodiment will be described with reference to FIG.
The recording timing of R will be described. For example, in this embodiment, first, as shown in FIG. 4 (a), the recording head A _REC
As a result, a recording section is formed within a half period of the rotation cycle of the rotary drum 1. Then, as shown in FIG. 4B, the recording head B _REC also forms a recording section within a half period of the rotation cycle of the rotary drum 1, and thereafter this recording operation is repeated. To go. That is,
In this case, as a conventional example, data processing for one track is performed and recording is performed so that the overlap section t _OR as shown in FIG. 11 does not occur. In the present embodiment, such a recording timing is realized because the data to be conventionally recorded on one track is subjected to processing such as blocking and time axis compression as described with reference to FIG. _REC ,
To feed the B _REC and, as a result, the rotary drum 1
The winding angle of the magnetic tape T with respect to the magnetic tape T is smaller than 180 ° so that the recording heads A _REC and B _REC facing each other at 180 ° do not contact the magnetic tape T at the same time. It should be noted that, even during reproduction, the respective areas recorded by the recording heads A _REC and B _REC are recorded as shown in FIG.
At the same timing as in No. 1, the reproducing heads A _PB and B _PB respectively reproduce.

In this way, since the overlap section t _OR is eliminated in this embodiment, crosstalk occurs without providing a short ring between the channels of the rotary transformer as shown in FIG. There will be no. As a result, it is possible to omit the short ring that has been conventionally provided and to reduce the groove of the rotary transformer that has been added. For example, in FIG. 10 shown as a conventional example, there are five grooves and four channels, but in FIG. 2 of this embodiment, there are four grooves and four channels. As described above, the facing area of each rotary transformer can be increased by the number of grooves, which is advantageous in terms of S / N ratio and the like.

FIG. 5 is a diagram showing a connection form from a recording / reproducing head to a recording / reproducing amplifier according to another embodiment. The structure and recording timing of the rotary head in this case are shown in FIGS. 1 and 4. It can be the same as the one. The circuit configuration of the digital VTR may be the same as that shown in FIG. However, at least the path from the recording head to the recording amplifier and the path from the reproducing head to the reproducing amplifier will be changed to the connection configuration described below.

In the present embodiment, the recording heads and the reproducing heads are made to correspond to the adjacent channels in the order of the channels 1 to 4 of the rotary transformer. That is, the recording head A _REC as shown in Figure 5, B _{RE C} are connected to each one channel and 2 rotary transformers RT ₁ channel, RT _2. And the rotary transformer RT ₁ ,
Recording amplifiers 21a and 21b are connected to RT ₂ , respectively. The reproducing heads A _PB and B _PB are rotary transformers R of 3 and 4 channels, respectively.
Rotary transformer R connected to T ₃ and RT ₄
Playback amplifier 31a against T _3, RT _4, 31b are connected. Also in this case, the rotary transformer has a four-groove, four-channel configuration as in the previous embodiment, and it is possible to eliminate crosstalk without inserting a short ring. It should be noted that a configuration similar to that of the connection configuration shown in FIG. 5 can be obtained even if the reproducing heads are associated with the 1st and 2nd channel sides and the recording heads are associated with the 3rd and 4th channel sides. It is possible.

FIG. 6 is a diagram showing a connection form from a recording / reproducing head to a recording / reproducing amplifier as still another embodiment. Also in this case, the configuration of the rotary head and the recording timing may be the same as those shown in FIGS. 1 and 4, and the circuit configuration of the digital VTR is at least the path from the recording head to the recording amplifier and the reproducing head. 3 may be the same as that of FIG. 3 except that the path from the reproduction amplifier to the reproduction amplifier is changed as described below. First, in the case of the present embodiment, an erasing head C is provided on the rotary drum 1 as shown by the broken line in FIG. 1, for example, to form a rotary head configuration including a flying erase head. In the case of this embodiment, as shown in FIG.
₁ to 5 channels _{1 to} RT ₅ are provided. On the rotor side, the recording heads A _REC and B _REC are connected to the 1-channel and 2-channel rotary transformers RT ₁ and RT ₂ , respectively, and the reproducing heads A _PB and B _PB are 2-channel and 4-channel rotary, respectively. It is connected to the transformers RT ₃ and RT ₄ .
Further, the erasing head C is connected to a 5-channel rotary transformer RT ₅ , and an oscillator OSC is connected to the stator side of the rotary transformer RT ₅ . At this time, one short ring SR is provided between the five channels corresponding to the erasing head C and the other channels as shown in the figure.

By the way, in the case of the present embodiment, since the crosstalk is eliminated by preventing the pair of recording heads from simultaneously contacting the magnetic tape as described above, the recording amplifiers 21a and 21b are turned on / off. Since it is not necessary to control the off state, it is possible to always supply the same signal current to the recording heads A _REC and B _REC . Also,
S / N of the signal output from the recording amplifier to the recording head side
Is sufficiently high as compared with the signal output from the reproducing head to the reproducing amplifier side, for example.

Therefore, in the case of this embodiment, the recording head A
Rotary transformers RT ₁ and R corresponding to _REC and B _REC
The recording amplifier 21a provided for the stator side of the T _2, rotary transformers RT the output of the recording amplifier 21a
₁ and RT ₂ are connected in parallel. By connecting in this way, the same signal current is always supplied from one recording amplifier 21a to the recording heads A _REC and B _REC, and one recording amplifier is sufficient even though there are two recording heads. Becomes The outputs of the coding circuits 20a and 20b shown in FIG. 3, for example, are combined and input to the recording amplifier 21a.

Further, on the stator side of the rotary transformers RT ₃ and RT ₄ corresponding to the reproducing heads A _PB and B _PB , the outputs of the rotary transformers RT ₃ and RT ₄ are inputted as shown in the figure to select them. A switch SW for switching to is provided, and the output of this switch is supplied to the reproduction amplifier 31a. The switching timing of the switch SW is based on the rotation cycle of the rotary head.
This switching control can be executed by the reproduction system control unit 38 (see FIG. 3), for example. In this configuration, the data signals reproduced by the reproducing heads A _PB and B _PB are alternately supplied to the reproducing amplifier 31a according to the switching timing of the switch SW. By doing so, it becomes possible to use only one reproducing amplifier in the reproducing system. Therefore, the reproduction amplifier 31a in this case
Of the decoding circuit 32 shown in FIG.
It will be branched and supplied to a and 32b. It is possible to connect the output of the reproducing head to the reproducing amplifier in parallel in the reproducing system as in the recording system. However, in consideration of the S / N of the output supplied from the reproducing head, this embodiment It is preferable that the head output is switched as described above.

FIG. 7 is a diagram showing a connection form from a recording / reproducing head to a recording / reproducing amplifier as still another embodiment. In this case as well, the configuration of the rotary head and the recording timing may be substantially the same as those shown in FIGS. 1 and 4, and the circuit configuration of the digital VTR is at least the path from the recording head to the recording amplifier and the reproduction from the reproducing head. It may be the same as in FIG. 3 except that the path to the amplifier is changed. In this figure, first, recording heads A _REC and B
1 channel rotary transformer with _REC output ₁
Is connected in parallel to the rotor side and the stator side is connected to the recording amplifier 21a. With this configuration, the rotary transformer and the recording amplifier can be combined into one system for one pair of recording heads. Such a configuration is possible because, as described in FIG. 6, in the present invention, crosstalk does not occur even if the same signal current is always supplied to the recording heads A _REC and B _REC. And the S / N of the signal output from the recording amplifier to the recording head side is sufficiently high. Further, the reproducing head side has the same configuration as that of the previous embodiment shown in FIG. 6, and therefore its explanation is omitted here. However, in this case, since the rotary transformer of the recording system has only one channel, the reproducing head A is used. Two-channel rotary transformer RT ₂ and three-channel rotary transformer RT ₃ correspond to _PB and B _PB , respectively. That is, in the present embodiment, the rotary transformer is reduced to 1 to 3 channels to form a total of 3 grooves and 3 channels, and the recording amplifier and the reproducing amplifier are each one system. In this embodiment as well, as shown in FIG. 6, it is possible to provide a flying erase head by the erase head C via the short ring SR, but in this case, a 5-groove 4-channel configuration is adopted.

FIG. 8 is a diagram showing a connection form from a recording / reproducing head to a recording / reproducing amplifier as still another embodiment. The same parts as those in FIG. 8 are designated by the same reference numerals and the description thereof will be omitted. In this embodiment, the recording heads A _REC and B _REC are used for the 1-channel rotary transformer RT ₁ .
Are connected in series. Even with such a connection, as in the case of FIG. 7, both the rotary transformer and the recording amplifier can be provided as one system for a pair of recording heads. Up to 3 channels reduced to a total of 3 grooves 3 channels,
The recording amplifier and the reproducing amplifier will be one system each. Also in this embodiment, as shown in FIG. 6, the flying erase head may be provided via the short ring SR.

The present invention is not limited to the ones shown in the above embodiments, and can be modified within the scope of the invention. For example, the circuit configuration of the digital VTR is as shown in FIG. It is not limited to the one described above, and may be changed according to the actual recording format and the added function. Further, in each of the above-described embodiments, the digital VTR that handles a video signal has been described, but it is also applicable to a device that can record and reproduce other data as a digital signal on a magnetic tape.

[0032]

As described above, the recording / reproducing apparatus of the present invention can eliminate crosstalk without providing a short ring which is conventionally inserted between channels of recording / reproducing heads facing each other. Therefore, by reducing the number of grooves in the rotary transformer to the required minimum, the facing area of the rotary transformer of each channel can be expanded, and the coupling characteristics, inductance, etc. are improved and the signal passing through the rotary transformer is improved. It has the effect of improving the characteristics.

Further, in the present invention, since a pair of recording or reproducing heads do not contact the magnetic tape at the same time, in a recording system, for example, the output of one recording amplifier corresponds to one pair of recording heads, respectively. The number of rotary transformers and the number of grooves associated therewith can be further reduced by supplying two channels of rotary transformers in parallel or connecting a pair of recording heads in parallel or in series to one rotary transformer. The recording amplifier can also be one system. Also, in the playback system, 1
By switching the output of two channels corresponding to a pair of reproducing heads with a switch and supplying it to one reproducing amplifier, it is possible to reduce the rotary transformer and the recording and reproducing amplifiers as much as possible to achieve cost reduction. It also has an effect.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of a rotary head of a recording / reproducing apparatus and a winding state of a magnetic tape according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a connection form from a recording / reproducing head to a recording / reproducing amplifier of this embodiment.

FIG. 3 is a block circuit diagram showing a configuration of a recording / reproducing apparatus of this embodiment.

FIG. 4 is an explanatory diagram showing recording timing by the recording head of the present embodiment.

FIG. 5 is a circuit diagram showing a connection form from a recording / reproducing head to a recording / reproducing amplifier as another embodiment.

FIG. 6 is a circuit diagram showing a connection form from a recording / reproducing head to a recording / reproducing amplifier as still another embodiment.

FIG. 7 is a circuit diagram showing a connection form from a recording / reproducing head to a recording / reproducing amplifier as still another embodiment.

FIG. 8 is a circuit diagram showing a connection form from a recording / reproducing head to a recording / reproducing amplifier as still another embodiment.

FIG. 9 is an explanatory diagram showing a structure of a rotary head of a recording / reproducing apparatus and a winding state of a magnetic tape in a conventional example.

FIG. 10: Recording / reproducing from the recording / reproducing head in the conventional example
It is a circuit diagram which shows the connection form to a reproduction amplifier.

FIG. 11 is an explanatory diagram showing recording timing by a recording head of a conventional example.

[Explanation of symbols]

1 rotary drum 21a, b recording amplifier 31a, b reproducing amplifier A _REC , B _REC recording head A _PB , B _PB reproducing head C erasing head RT _{1 to} RT ₄ rotary transformer SR short ring

Claims (10)

[Claims] 1. A recording / reproducing apparatus capable of recording or reproducing information on a tape-shaped recording medium wound around a rotating drum by a helical scan method, comprising: a pair of recordings on the rotating drum. Recording / reproducing, characterized in that a head and a pair of reproducing heads are provided so as to face each other by 180 °, and at least recording sections by the pair of recording heads do not overlap. apparatus. 2. A wrapping angle of the tape-shaped recording medium with respect to the rotary drum is set to be smaller than 180 ° so that at least the pair of recording heads or the pair of reproducing heads do not contact the tape-shaped recording medium at the same time. The recording / reproducing apparatus according to claim 1, wherein 3. The rotary drum is provided with two rotary transformers for supplying signals to the pair of recording heads, and two rotary transformers for supplying signals to the pair of reproducing heads, respectively. The recording / reproducing apparatus according to claim 1 or 2, wherein 4. The recording according to claim 1, wherein in the rotary transformer, the pair of recording heads and the pair of reproducing heads are connected so as to alternately correspond to each other. / Playback device. 5. The rotary transformer, wherein the pair of recording heads and the pair of reproducing heads are connected so as to correspond to adjacent channels, respectively. The recording / reproducing device according to 1. 6. The output of one recording amplifier is supplied in parallel to two rotary transformers supplying signals to the pair of recording heads. The recording / reproducing apparatus according to claim 5. 7. The recording / reproducing apparatus according to claim 1, wherein the pair of recording heads are connected in parallel to one rotary transformer which supplies a recording signal. . 8. The recording / reproducing apparatus according to claim 1, wherein the pair of recording heads are connected in series to one rotary transformer that supplies a recording signal. 9. A changeover switch for selectively changing the outputs of two rotary transformers to which the respective signals from the pair of reproduction heads are supplied at a predetermined timing is provided, and the output of the changeover switch is one reproduction. 9. The recording / reproducing apparatus according to claim 1, wherein the recording / reproducing apparatus is input to an amplifier for use. 10. An erasing head is provided for the rotating drum, a channel of a rotary transformer corresponding to the erasing head, and a channel of a rotary transformer corresponding to the pair of recording heads and the pair of reproducing heads. 10. The recording / reproducing apparatus according to claim 1, further comprising a short ring inserted between the recording medium and the recording medium.