JPS593708A - Magnetic recording and reproducing method - Google Patents

Abstract

PURPOSE:To improve recording characteristics by imposing frequency modulation on a signal to be recorded and vibrating a magnetic head at right angles to the running direction of a tape for recording and reproduction. CONSTITUTION:An input signal is frequency-modulated by a modulating and recording circuit 1 and then impressed to the magnetic head 2. The magnetic head 2 is supported elastically on a chassis through a supporting member 4, which is fitted with an exciting device 5 for vibrating the magnetic head 2. The device 5 is driven by a driving signal outputted from a scanning circuit 6. The magnetic head 2 vibrates at right angles to the running direction of the magnetic recording tape T, so the FM-modulated signal from the modulation and recording circuit 1 is recorded on the magnetic tape T in a slanting direction 7. Therefore, the relative speed between the magnetic head and magnetic recording tape is increased greatly and the recording characteristics of a high-frequency signal are improved greatly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing method. In general, the signal quality of a magnetic recording tape is such that the faster the relative speed to the magnetic head, the better the frequency characteristics.
The wider the recording band, the better the 8N ratio, but the audio recording sections of video tape recorders, which have become widely used in recent years, are under conditions that go against the above principle, and are content with extremely poor sound quality. In the current situation. In other words, for the Ozone Reel Teso recorder, the tape width is approximately 621, and the running speed is 9.
．． 5 cn/see, cassette tape and coder according to Filitsuzo company's standards, approximately 3.8 centimeters in the tape, running speed 4-7
5 cm/sec, whereas in the audio recording section of the VH 80,000-type video tape recorder, the running speed is 1cm/sec while recording the tape! 33.3511!11/1ie
l:, and with 1/3x speed long-time mode F"K, the running speed is 11.12wn/sec, so compared to the other recording methods mentioned above, including the deterioration of the wah-7 rutter characteristic. However, the sound quality deteriorates significantly in 1/3x speed mode, so improvements are desperately needed.
was.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic recording and reproducing method which eliminates the drawbacks of the above-mentioned magnetic recording and reproducing method and allows good sound quality to be obtained even when the tape is running at a low speed.

An embodiment of the present invention will be explained below based on the drawings.

In the figure, T indicates a magnetic recording tape for VTR, TI indicates an audio recording track, TI indicates all image recording tracks,
One shows the entire apparatus and circuit for magnetic recording on the audio recording track.

Reference numeral 1 denotes a modulation recording circuit for performing FM modulation on a signal if input from an input section IN and recording the signal tl, and its output section is connected to a magnetic head 2. 7 is a circuit for amplifying and demodulating the signal from the magnetic head 2; S indicates a switching circuit during recording and reproduction. The magnetic head 2 is configured to vibrate in a direction perpendicular to the running direction of the magnetic recording tape T. In the embodiment, the magnetic head 2 is elastically attached to a chassis 3 of a device (not shown) via a support member 4. The magnetic head 2 is supported on the support member 4.
An excitation device 5 for moving the metal is attached.

In the illustrated example, a piezoelectric element is shown as this excitation device. The excitation device 5, that is, the piezoelectric element is driven by a drive signal outputted from the scanning circuit 6, and when the magnetic head 2 vibrates, the VC@air as shown in FIG. FM is recorded on the recording tape T by the modulation recording circuit 1.
The locus 7 of the new recording band of the modulated signal exhibits, for example, a sine wave shape as shown in FIG. 2, and the relative speed between the magnetic head 2 and the magnetic recording tape T can be greatly increased. It becomes possible to record high frequency signals.

Further, as shown in FIG. 3, the same effect can be obtained even if the magnetic head 2 is excited so that the turning point P is located outside the audio recording track Tl.

In addition to increasing the relative speed between the magnetic head 2 and the magnetic recording tape T, by setting the gap between the magnetic head 2 narrower, it is possible to record signals of even higher frequency. Therefore, since the FM recording frequency can be set high, it becomes easy to modulate and record the audio multiplexed signal. Also,
The magnetic head 2 may have two channels, each recording separate signals (R, L); in this case,
As shown in FIG. 4, if the magnetic head 2 records signals on the outward path (solid line) and does not record signals (blanking) on the return path (broken line), the recording band will be in a nominal shape as shown in the figure. It is also possible to effectively utilize the tape surface.

Furthermore, in order to reduce the cross H-nik between adjacent recording tracks, the E-cross talk can be reduced by providing the recording heads of two channels each with an n azimuth angle. Furthermore, it is also possible to increase the number of recording and reproducing channels by using an even number of recording heads, such as 4, 6, and 8 recording heads. Also, if a card band is used between recording tracks, recording and reproduction of odd numbered channels is also possible. In the case of reproduction, the recorded signal is taken out by the magnetic head 2 by vertically tracing the recorded TESO T, passed through the switching circuit S, and the reproduced signal is obtained by the 7 reproduction amplification demodulation circuit.

The scanning circuit can also use a tracking signal to accurately position the magnetic head on a track during recording and reproduction.

In the magnetic recording and reproducing method according to the present invention, the signal to be recorded is FM modulated and the magnetic head is vibrated in a direction perpendicular to the running direction of the magnetic recording tape.
'Since the M-modulated n9 signal is recorded diagonally, the relative speed between the magnetic head and the magnetic recording tape can be greatly increased, and the recording characteristics of high-frequency signals can be significantly improved. I can do it. In addition, the recording and playback characteristics are improved by iFM modulating the signal, and it is also possible to record audio multiplexed signals.Furthermore, as a characteristic of FM modulation, it is also possible to improve the wah-7-raku effect, especially for low tapes. It has excellent features as a recording method for speed equipment.

[Brief explanation of the drawing]

The drawings show an embodiment of the magnetic recording and reproducing method according to the present invention,
FIG. 1 is an overall schematic diagram, and FIGS. 2 to 4 are plan views showing the trajectory of a recording band on a magnetic recording tape. 1: Modulation recording amplification circuit, 2: Magnetic head, 5: Piezoelectric element as an excitation device, 7: Reproduction amplification demodulation circuit, 8: Recording/reproduction switching circuit, 6: Scanning circuit. Figure 3

Claims (1)

[Claims] In a tape recorder, the signal to be recorded is FM-modulated and the magnetic head is vibrated in a direction perpendicular to the running direction of the magnetic recording tape, and the FM-modulated signal is supplied to the magnetic head and transferred onto the magnetic recording tape. A magnetic recording and reproducing method characterized by recording and reproducing.