JPH0731874B2 - Magnetic recording / reproducing method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing method capable of arbitrarily changing an output signal time axis in the acoustic field, for example.

2. Description of the Related Art As a conventional magnetic recording / reproducing apparatus, for example, JP-A-60-
No. 25055.

FIG. 4 shows a block diagram of a conventional time axis converter. 1 is an encoder that digitizes an analog signal,
2a is a two-head type rotary head type magnetic recording / reproducing apparatus (hereinafter abbreviated as VTR) having a winding angle of 90 degrees, and 3 is a digital signal converted into an original analog signal after correcting an error in an input signal. Decoder for outputting, 4 is a compressor for compressing the digital signal on the time base, 5 is an expander for expanding the digital signal on the time base, 21a is a changeover switch for switching the data flow in the VTR 2a, and 22a is a 90 degree switch. 2 with wrap angle
Head type rotary head (hereinafter abbreviated as rotary head), 23
Is a magnetic tape.

FIG. 5 is a diagram showing the flow of a digital signal on the time axis when recording / reproducing is performed using the rotary head 22a of FIG. The operation will be described below. Audio signal
AI is converted by the encoder 1 into a digital signal DO as shown in FIG. This time-continuous digital signal DO is converted by the compressor 4 into an intermittent signal CO as shown in FIG. The intermittent signal CO passes through the changeover switch 21a in the two-head type rotary head type magnetic recording / reproducing apparatus 2a having a winding angle of 90 degrees and is recorded on the magnetic tape 23 by the rotary head 22a. In addition, the signal recorded on the magnetic tape 23 is
The signal is read by the rotary head 22a, passes through the changeover switch 21a, is returned to the continuous signal DI shown in FIG. 5 by the decompressor 5, and is then converted into the original analog audio signal AO by the decoder 3.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above configuration, there is a drawback that only the intermittent data for the rotary head type recording / reproducing apparatus 2a having a winding angle of 90 degrees has a time-axis conversion function of a signal. Had.

In view of such a point, the present invention, from a magnetic recording / reproducing apparatus having an arbitrary rotating cylinder diameter and a winding angle, does not depend on the rotating cylinder diameter and the tape winding angle,
It is an object of the present invention to provide a magnetic recording / reproducing device capable of performing signal conversion to a magnetic recording / reproducing device having a winding angle.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention, at the time of recording or reproducing, is the reciprocal of the ratio of the cylinder diameters of the two magnetic recording and reproducing apparatuses, or the winding angle of the two magnetic recording and reproducing apparatuses. It is characterized by having a time axis compression / expansion function corresponding to the ratio.

Effect The present invention can reduce the cylinder diameter of the rotary head by applying the above-mentioned function to the rotary head type magnetic recording / reproducing apparatus, and thus can downsize the apparatus.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. Here, for simplicity, the case where the winding angles are 180 degrees and 90 degrees will be described.

FIG. 1 shows a block diagram of a magnetic recording / reproducing apparatus in an embodiment of the present invention. In FIG. 1, reference numeral 2b is a two-head type rotary head type magnetic recording / reproducing apparatus (hereinafter abbreviated as DTR) having a wrap angle of 180 degrees for recording / reproducing a digital audio signal, and 21b is a recording / reproducing switch.
22b is a rotary head, 23 is a magnetic tape, 6 is a compressor that compresses and outputs input data on the time axis, 7 is an expander that expands and outputs input data on the time axis, and 8 is a 90-degree winding. It is a signal processing device of a rotary head type digital audio tape recorder (hereinafter abbreviated as R-DAT) having an attachment angle.

FIG. 2 is a diagram showing compression of a signal by the compressor 6 of FIG. 1 during reproduction of the DTR2b of FIG. 1, and FIG. 3 is expansion of a signal by the decompressor 7 of FIG. 1 during recording of the DTR2b. FIG.

The operation of the time axis converter of the present embodiment configured as described above will be described below. When the DTR2b is reproduced, the continuous reproduction signal SI as shown in FIG. 2 is input, the compressor 6 compresses the reproduction signal SI and outputs the intermittent signal DO as shown in FIG. 2 to the signal processing device 8. To do. The signal processing device 8 converts the intermittent signal DO into an audio analog signal AO and outputs it. Next, at the time of recording the DTR2b, the signal processing device 8 converts the analog signal AI into a digital signal and outputs the third signal.
A digital intermittent signal DI as shown in the figure is output, and the intermittent signal DI is input to the decompressor 7. Expander 7 is an intermittent signal
DI is expanded on the time axis and a digital continuous signal SO as shown in FIG. 3 is output to DTR2b. The DTR 2b records the continuous signal SO on the magnetic tape 23 as a recording signal. The signal processing device 8 is an R-DAT signal processing device, and its technical contents are known. Also, the DTR2b has a cylinder diameter half that of the R-DAT, and is suitable for downsizing of the device.

As described above, according to this embodiment, the compressor 6 and the expander 7 are
By providing the above, the DTR 2b can be recorded and reproduced by using the signal processing device 8 for R-DAT, and the DTR 2b can be used, so that the digital audio tape recorder device can be miniaturized.

As described above, according to the present invention, a magnetic recording / reproducing apparatus having an arbitrary cylinder diameter and an arbitrary winding angle can be realized by using a signal processing signal used in a conventional R-DAT. For example, the wrap angle is 18 with half the conventional cylinder diameter.
A 0 ° rotary head type magnetic recording / reproducing apparatus can be easily realized and miniaturized.

[Brief description of drawings]

FIG. 1 is a block diagram showing a magnetic recording / reproducing apparatus according to an embodiment of the present invention, FIG. 2 is an explanatory view showing a data compression operation at the time of reproducing of the same embodiment, and FIG. 3 is at the time of recording of the same embodiment. 4 is an explanatory view showing the data decompression operation of FIG. 4, FIG. 4 is a block diagram of a conventional magnetic recording / reproducing apparatus, and FIG. 5 is a relational diagram of input / output data of the apparatus on the time axis. 6 ... Compressor, 7 ... Expander.

Front Page Continuation (72) Inventor Tahiro Murase 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Naoki Ejima, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (56) References JP-A-60-661 (JP, A)

Claims (1)

[Claims] 1. A two-head type rotary head type magnetic recording / reproducing apparatus for obtaining a recording signal for an arbitrary tape winding angle B by inputting a recording signal for a tape winding angle A of a rotating cylinder. The time axis is extended by the ratio (B / A), and the signal at the time of reproduction at the tape winding angle B is input to obtain the signal at the time of reproduction at the tape winding angle A. A magnetic recording / reproducing method characterized in that the time axis is compressed by.