JPH03237602A - Rotary head type magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To record and reproduce data at high speed and to simultaneously monitor and record data at high speed by setting the rotary speed of rotary heads and the travel speed of a magnetic tape to twice as much as a standard value, and providing a phase difference to frame synchronizing signals in a recording system signal processing circuit and a reproduction system signal processing circuit. CONSTITUTION:A pair of recording heads 1 and 3 and a pair of reproduction heads 2 and 4 are fitted to a rotary drum for herical scan 10. Total four heads 1-4 are sequentially arranged in a direction opposite to the rotary direction of the drum 10 with the allocation angle of 90 degrees. A capstan 12 rotates at speed twice as much as a specified speed and it drives the tape 7 with a pinch roller 13. The rotary drum 10 is also driven at the speed twice as much as the standard speed. For executing simultaneous monitoring recording, the frame synchronizing signals in the recording system signal processing circuit 14 and the reproduction system signal processing circuit 24 have the prescribed phase. Thus, time required for recording and dubbing computer output data is shortened and simultaneous monitoring recording at the time of dubbing is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a helical scan rotary head type magnetic recording/reproducing device, and particularly to a device for recording/reproducing digital signals.

[Conventional technology]

A so-called DAT (digital audio recorder) is a device that has been standardized and commercialized as a device for magnetically recording and reproducing digital signals using a helical scan method. In this conventional DAT, the magnetic tape running speed, data transfer rate, etc. are standardized, and the data transfer rate is 192 kByte/sec. Note that this standard was established at the General Report of the DAT Conference.

[Problem to be solved by the invention]

Although it is possible to dub data by using two conventional standardized DATs, this requires a relatively long time, and a reduction in time is desired.

Furthermore, when using a DAT for recording computer output and backing up data, it is desired to shorten the time required for recording and reproducing, that is, high-speed access. It is also desired to perform simultaneous monitor recording at high speed to ensure dubbing.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a rotary head type magnetic recording/reproducing apparatus which is capable of recording and reproducing data at a speed faster than that specified by the conventional DAT standard, and can also perform high-speed simultaneous monitor recording.

[Means to solve the problem]

In order to achieve the above object, the present invention sets the rotation speed of the rotary head and the running speed of the magnetic tape to twice the conventional standard values, and also sets one pair of rotary heads for recording and one pair for reproduction. Rotating heads are provided separately, and a predetermined distance is provided between them in the direction of the drum axis, and synchronization means is provided for providing a predetermined phase difference between frame synchronization signals in the recording system signal processing circuit and the reproduction system signal processing circuit. It is set up.

That is, according to the present invention, a pair of recording heads are arranged at intervals of 1800 with respect to the center of rotation of the helical scanning drum, and a pair of recording heads are arranged at intervals of 180'' from each other at a predetermined angle from the pair of recording heads. and a pair of playback heads mounted at a predetermined distance in the axial direction of the drum from the mounting position of the recording head, and the drum is rotated at twice the speed specified by a predetermined standard. means for causing the magnetic tape running while being wound around the drum to run at a speed twice as high as a value determined by the predetermined standard; and a recording system signal processing circuit for processing recording signals supplied to the recording head. and a reproduction system signal processing circuit that processes the reproduction signal supplied from the reproduction head.
There is provided a rotary head type magnetic recording and reproducing apparatus having synchronization means for providing a predetermined phase difference between the phases of frame synchronization signals in the recording system and reproduction system signal processing circuits.

[For production]

Since the rotating head type magnetic recording/reproducing device of the present invention has the above configuration, not only the recording time according to the DAT standard is halved, but also simultaneous monitoring recording is possible to ensure dubbing, resulting in even higher speeds. Since recording and playback is possible,
By appropriately controlling the interface, it can also be applied to data storage such as computer output.

〔Example〕

Embodiments of the rotary head type magnetic recording/reproducing apparatus of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing one embodiment of the present invention. A pair of recording heads 1 and 3 and a pair of reproduction heads 2.4 are attached to the helical scan rotating drum 10. Each pair of heads 1° 3, 2, and 4 is a +azimuth Ach (channel) recording head 1, a reproduction head 4, and a -azimuth Bch recording head 3 and reproduction head 2. The pair of heads are arranged opposite to each other with an interval of 180@ to the center of rotation of the drum 10. Further, the above-mentioned total of four heads 1 to 4 are arranged in the order of 1.2.3.4 in the direction opposite to the rotational direction of the drum 10 indicated by arrow A, with an allocation angle of 90°. . In the figure, 6 is the guide boss, 7 is the drum 10
This is a magnetic tape that runs in the direction of arrow B while being wound around the magnetic tape. Further, 12 is a capstan, which is rotated at twice the standard speed by a capstan motor 12M, and drives the tape 7 together with the pinch roller 13.

Note that the drive device for each reel of the cassette is the same as the conventional device and is not shown. The rotating drum 10 is also driven at twice the standard speed by the drum motor IOM. This standard speed or standard value is the number of rotations of the drum that corresponds to the track pattern that satisfies the DAT standard.
Varies depending on drum diameter.

FIG. 2 is a side view showing the position of each head attached to the drum 10 in the drum axis direction. The drum 10 consists of a rotating upper cylinder 8 and a fixed lower cylinder 9, and each head 1-4 is attached to the upper cylinder 8.As shown in the figure, the recording head 1.3 is attached. With respect to the position , the axial position of the reproducing heads 2 and 4 is downward, that is, a distance d apart from the lower cylinder 9. More specifically, the playback heads 2 and 4 are set to the recording head 1.
．． It is located 23.8μ below 4 in the axial direction,
In other words, a step d is provided between the recording/reproducing heads.

Since the rotational speed of the rotary heads 1 to 4 and the running speed of the tape 7 are set to twice the standard values and standard values mentioned above, the frequency of the recording and playback signals is twice the frequency of 9.4MH2 in the conventional DAT. It is 18.8MH2.

Therefore, the frequency characteristics of each of the heads 1 to 4 and the rotary transformer are designed to be suitable for such high frequency signal processing.

In FIG. 1, a recording system signal processing circuit 14, a recording amplifier 16,
Reproduction amplifier 18 selector switch 5WISW2, equalizer 20. The PLL circuit 22, reproduction system signal processing circuit 24, interface 28, control section 30, servo circuit 32, and drivers 34 and 36 are basically the same as those of the conventional DAT, but as mentioned above, recording and reproduction signals Since the frequency is twice that of conventional devices, frequency characteristics commensurate with this are required.

The control unit 30 controls the servo circuit 32 to drive the driver 34.
drives the capstan motor 12M at twice the standard speed, increasing the tape speed from the conventional 8.15 m5/s to 16.
30 w/s, and the driver 36 is a drum motor IO.
M is the standard value (for a drum diameter of 30 m) 2, OO
It is driven at 4,000 rpm, which is twice the Orpm. The CPU in the control unit 30 is programmed to not only perform the above-mentioned control but also control the entire device in the same way as a conventional DAT. That is, identification of recording/playback mode, generation of subcodes during recording, reading of subcodes during playback, recording system signal processing circuit 14 and playback system signal processing circuit 24
Control such as mode signal transfer between the servo circuit 32 and the servo circuit 32 is performed.

Next, the operation when performing simultaneous monitor recording using the rotary head type magnetic recording/reproducing apparatus shown in FIG. 1 will be described. The recording data input to the interface 28 is converted into a recording signal in a predetermined format by the recording system signal processing circuit 14.
2 for recording with the switch SWI via the recording amplifier 16.
It is divided into two heads 1°3. Thus tape 7
The recorded signals are immediately pinked up by the two reproduction heads 2.4 and supplied to the reproduction amplifier 18 via the switch SW2. The output signal of the reproduction amplifier 18 is applied to a reproduction system signal processing circuit 24 via an equalizer 20 and a PLL circuit 22, converted into reproduction data, and outputted via an interface 28. In addition, each of the above switches SWI
, the switching speed of SW2 is also twice the standard value.

FIG. 3 is a time chart showing the temporal relationship among the recording/reproducing identification signal, channel identification signal, recording signal, and reproduction signal.

As can be seen from the figure, the signal recorded on the tape 7 is reproduced when the drum 10 has rotated 270' from the time of recording.

The recording data input from the interface 28 to the recording system signal processing circuit 14 has a standard value of 192 kBy.
The transfer rate is 384 kByte/s, which is twice the transfer rate of te/s. Therefore, C1/C2 in the recording system signal processing circuit 14
Signal processing such as parity addition, interleaving, modulation, etc. is also performed at twice the speed of conventional values.

On the other hand, the output signal of the reproduction amplifier 18 is 2 times the conventional reproduction output.
Since the frequency is twice as high as 18.8 MH, the equalizer 20 and the PLL circuit 22 must have characteristics corresponding to this frequency. Data and clocks are extracted by these circuits, and fed to the reproduction signal processing circuit 24, which can operate at twice the speed of conventional devices, where they are demodulated, deinterleaved, and CI/C2 corrected, and are output as simultaneous monitor output data. The signal is applied to the interface circuit 28.

In order to perform the above simultaneous monitor recording, the frame synchronization signals in the recording system signal processing circuit 14 and the reproduction system signal processing circuit 24 must have a predetermined phase. That is, as shown in the timing chart of FIG. 4, a synchronization relationship is required in which the frame synchronization signal of the recording system has a phase delay of 90° with respect to the reproduction system. The synchronous circuit 26 is
For this purpose, it is a synchronization means that generates two signals with a phase difference of 90@, and the above synchronization relationship is obtained based on these signals.

〔Effect of the invention〕

As is clear from the detailed explanation above, according to the rotary head type magnetic recording/reproducing apparatus of the present invention, the data transfer speed is 384 kByte/s, which is twice that of the conventional one, and is suitable for recording computer output data and dubbing. Not only can the time required be half that of the conventional device, but also simultaneous monitoring and recording can be performed during dubbing, making the operation reliable and accurate. Furthermore, since the signal content and formant within the magnetic tape obtained by high-speed dubbing are exactly the same as those of conventional DAT, there is compatibility in that it can be reproduced as is with conventional DAT.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the rotary magnetic recording/reproducing apparatus of the present invention, FIG. 2 is a side view showing the drum and magnetic tape in FIG. 1, and FIGS. 3 is a time chart for explaining the operation of the device shown in the figure. 1.3... Recording head, 2, 4... Playback head, 6
...Guide post, 7...Magnetic tape, 8...Upper cylinder, 9...Lower cylinder, 10...Drum, I
OM...Drum motor, 12...Capstan, 1
2M... Capstan motor, 13... Pinch roller, 14... Recording system signal processing circuit, 16... Recording amplifier, 18... Playback amplifier, 20... Equalizer,
22...PLL@path, 24...Reproduction system signal processing circuit, 26...Synchronization circuit, 28...Interface,
30...Control unit, 32...Servo circuit, A...Drum rotation direction, B...Magnetic tape running direction, d...
Step. Inventors: Morisaki-Hiko, Fumio Sato, Hatao Inoue, Hayami, Jun Iwata, Hiroshi Nakayoshi, Applicant: Victor Co., Ltd., Japan.

Claims (1)

[Claims] (1) A pair of recording heads arranged 180 degrees apart from each other with respect to the center of rotation of the helical scan drum, and a pair of recording heads arranged 180 degrees apart from each other at a predetermined angle from the pair of recording heads.
A pair of playback heads arranged at 0° intervals and mounted at a predetermined distance in the axial direction of the drum from the mounting position of the recording head, and
means for rotating the magnetic tape at twice the speed; means for causing the magnetic tape running while being wound around the drum to run at twice the speed determined by the predetermined standard; and processing a recording signal to be supplied to the recording head. a recording system signal processing circuit, a reproduction system signal processing circuit for processing a reproduction signal supplied from the reproduction head, and a synchronization means for providing a predetermined phase difference between the phases of frame synchronization signals in the recording system and reproduction system signal processing circuits. A rotary head type magnetic recording and reproducing device comprising: