Magnetic recording and reproducing system using preceding and la

Details Magnetic recording and reproducing system using preceding and la Magnetic recording and reproducing system using preceding and la

1985-09-23

1989-03-07

Faber, Alan

Dynamic magnetic information storage or retrieval

Record editing

360 141, 360 361, 358330, 358343, H04N 5782

Patent

active

048111210

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a magnetic recording and reproducing system of the rotary head type in which a video signal of a predetermined unit such as one field or the like and audio signals corresponding to the video signal of the predetermined unit length are sequentially recorded or reproduced by rotary magnetic heads in such a manner that those signals are recorded as a single record locus which is slanted with respect to the longitudinal direction of a magnetic tape.


BACKGROUND ART

At present, a helical scanning technique in which video tracks are obliquely traced on a tape by the rotary heads is the main type of scanning technique used in magnetic recording and reproducing systems (hereinafter, simply referred to as VTR). This type of scanning is employed in a VTR for use in the home to attain a miniaturized highly compact construction. For example, in VTR of the VHS system, the video signal is obliquely recorded on the tape having a width of 1/2 inch by use of two video heads arranged so as to be away from each other by 180.degree. on the rotary cylinder having a diameter of 62 mm. On one hand, in broadcasting VTR as well, a miniaturized and light-weight VTR is demanded for portable use for collection of news and for production of field programs, and VTR's of the U-standard of 3/4 inch are fairly used. For a news collection VTR, a high picture quality as well as small-size and light-weight is required for use in broadcasting. In the case of the U-standard VTR of 3/4 inch, there is a limitation of miniaturization since the cylinder diameter is 110 mm and the tape width is 3/4 inch. In addition, as for the recording method of the video signal, a method is adopted wherein the luminance signal is a frequency-modulated wave and the low frequency band is removed and the low frequency band converted carrier chrominance signal is added. Therefore, the frequency bands of the luminance signal and chrominance signal are limited and the picture quality is not necessarily satisfactory for use in broadcasting.
The small-sized and light-weighted system in which the reproduced image with a high picture quality is obtained has been proposed in consideration of the foregoing point (Japanese Patent Unexamined Publication No. 118490/1982). According to a system, the high quality image can be derived even by use of the cylinder of a diameter and the cassette of a size which are almost the same as those in the home-use VTR, and accordingly the system configuration can be miniaturized and made light-weight as compared with conventional news collecting VTR.
FIG. 1 is a plan view of an arrangement of the heads on the cylinder for use in the foregoing system. FIG. 2 is a front view of the heads appearing in FIG. 1. FIG. 3 is a diagram showing an example of the recorded patterns by the heads. FIG. 4 is a block diagram of one embodiment of the recording system using the heads. FIG. 5 shows a waveform diagram of the main part in FIG. 4. The recording system will then be described with reference to FIG. 4.
In FIGS. 1 and 2, reference characters A.sub.1 (A.sub.2), A.sub.1 ' (A.sub.2 ') and B.sub.1 (B.sub.2), B.sub.1 '(B.sub.2 ') denote two pairs of heads arranged at the positions on the circumference of the cylinder, which are away from each other by an angle of 180.degree., such that they are aligned at the same height of the cylinder. In FIG. 3, A, A', B, and B' indicate loci written by the heads A.sub.1, A.sub.1 ', B.sub.1, and B.sub.1 ', respectively. In FIGS. 2 and 3, T.sub.A and T.sub.B denote track widths of the heads A.sub.1 (A.sub.1 ') and B.sub.1 (B.sub.1 '), respectively, T.sub.P indicates a track pitch, and T.sub.S represents a space. When the diameter and rotating speed of the cylinder, the values of x and y in FIG. 2, the values of T.sub.A, T.sub.B and T.sub.S, the tape speed, and the angle between the tape and the record locus are now properly determined, the loci as shown in FIG. 3 are obtained when the heads are arranged at the positions as shown in FIGS. 1 and 2. For example, it is poss

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