JPS6098567A - Recording device of information signal - Google Patents

Abstract

PURPOSE:To attain recording always stably without the change of characteristics independently of the diameter of a recording track by changing the mixing ratio of the 1st information signal arranged in a comparatively high frequency band to the 2nd information signal arranged in a comparatively low frequency band in accordance with a means obtaining the information on the diameter of a circular track. CONSTITUTION:A luminance signal FM-modulated by am FM-modulator 6 so as to select a comparatively high frequency band and a line sequencial color difference signal FM-modulated by an FM-modulator 9 in a comparatively low frequency band are multiplied at their frequency by a recording amplifier 7 and the output of the amplifier 7 is recorded on a sheet 12 rotated at a constant speed by a motor 13 through a head 11. A system controller 15 moves the head 11 on a track specified by an operation part through a head feeding mechanism 14 and supplies a control signal related to the diameter of the track to a level adjusting circuit 10 to control the level. Namely, the level is reduced at the recording in a track having a small diameter and the level is increased at the recording in a large track.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field> The present invention relates to an information signal recording device, and particularly to an information signal recording device that records two or more different information signals while forming a circular track on a rotating recording medium.
(No. 13 is a frequency control device) (Relates to a device for recording a mixed signal.

<Description of Prior Art> In this type of device, a large number of circular tracks are usually formed by rotating a sheet-like recording medium at a constant speed and moving a head in the radial direction of the sheet-like recording medium. .

Therefore, the relative speed between the head and the medium varies depending on the diameter of the track. Since the gap width of the head is, of course, constant, there will be a difference in the recording level depending on the frequency of the information signal to be recorded, depending on the size of the diameter, even when recording is performed with the same recording current as -C1t. This also relates to the problem of interference between pieces of information, especially when recording a mixed signal in which two or more information signals are frequency-multiplexed.

This type of device, for example, rotates a magnetic sheet and sends a magnetic head in its radial direction to form a large number of circular tracks and record one field of a color video signal on each track. By playing the color Ifi', Ih I'! There is a magnetic recording image reproducing device (hereinafter referred to as SV in Jt+) which outputs a II signal to 1'. In the following description, this SV will be explained as an example.

FIG. 1 is a diagram showing an example of the frequency convergence spectrum drum of Record No. 18 in Sv. In Figure 1, 1 indicates the frequency spectrum of the FM-modulated line-sequential color difference signal, and 2 indicates the frequency spectrum of the FM-modulated luminance signal.When recording on the zero track, the recording level of the kiFM-modulated luminance signal tends to become small. It is. As a result, the amount of interference of the line-sequential color difference signal component with the luminance signal component increases, resulting in beats appearing on the screen during playback. The object of the present invention is to provide an information signal recording device that can perform optimal recording with a simple configuration when recording a mixed signal consisting of two or more information signals on circular tracks with different diameters. It is said that

<Description of Examples> The present invention will be described below using Examples. FIG. 2 is a diagram showing a simple configuration of the Sv recording system according to the present invention.

In Figure 2, 3 is the input terminal for the luminance signal (Y), 4°5
16 is a Y FM modulator, 7 is a recording amplifier, 8 is a 2-inch switch for line-sequentializing two color-difference signals, and 9 is a line-sequential color-difference signal. 10 is a level adjustment circuit, 11 is a head, 12 is a magnetic sheet, 16 is a motor, 14 is a head feeding mechanism, and 15 is a system controller.

The FM modulator 6 modulates the FM luminance signal in a relatively high band, and the 2M modulator 9 modulates the FM in a relatively low band.
The M-modulated ly sequential color difference signal is frequency-multiplexed by a recording amplifier, and recorded by a head 11 and a motor 13 on a sheet 12 rotating at a constant speed. This mixed signal has a frequency spectrum as shown in FIG.

The system controller 15 moves the head via the head feeder 4a41!114 onto a track specified by an operation section (not shown), and supplies a control signal related to the diameter of the track to the level adjustment circuit 10 to adjust the level adjustment circuit 10. Control levels. That is, when recording on a track with a small diameter, the level is set low, and when recording on a track with a large diameter, the level is set high. Figures 3 and 4 show the configuration of the level adjustment circuit 10 shown in Figure 2. It is a figure showing an example. FIG. 6 shows that when the gain K is recorded on T1, for example, in response to the track chill (where R is an integer, Tl is the smallest diameter track, and Tso is the largest diameter track), the above-mentioned control signal is - 0,42
, Tso, K = 1, and when recording on Tso, K is determined as K - 0,4 + 0.02 x le. For example, a well-known voltage control amplifier (VCA) may be used as this circuit.

Figure 4 shows the sequential color difference signals of the FM variable N14 m when recording to Tl-111, when recording to 'l'1e -IIOK, and when recording to Ti1-Tso. This is a diagram showing an example of a specific circuit configuration of a level adjustment circuit for recording at a level of 0. For example, when recording at Tt-wxs, a voltage is applied to only the input terminal 17' of control number 4M.
When recording on Tis to SO, apply a high level input signal only to terminal 17', and
When recording to 1sl-Tso, terminal 1. ,7'
, 17' are busy giving low level signals, so the output level of the level JσI4 adjustment circuit 10 is changed in six steps. 16 and 16' in Figures 6 and 4.
is the input terminal, 18, 18' is the output terminal, 17.17'
, 17' is a control (No. 1 input terminal).

According to the above configuration, the smaller the diameter of the track, the more
The mixing ratio of the FM modulated color difference signal to the l'M modulated 11 degree signal becomes smaller. Therefore, even if the level on the high frequency side of the FM modulation brightness number 48 becomes small during playback when a relative speed cannot be maintained, it is possible to suppress the generation of beat components due to the color difference signal. Can you do it? ! ) It is possible to prevent beats from occurring on the main screen.

The method for changing the mixing ratio is the above-mentioned 'j! :/1
In the fIi example, this is achieved by changing the level in the transmission system of the F'M modulated color difference signal, but
This can also be achieved by changing the level in the transmission system of the M-modulated luminance signal. It can also be realized by a combination of both.

In addition, in the description of the above-mentioned embodiments, illustrations and explanations of parts not directly related to the present invention, such as various apricots and video signal glaze processing circuits, are omitted. I have only mentioned those that apply
The present invention can be modified as appropriate within the scope of the claims, and can be applied to a device that records information signals on circular tracks with different diameters to great effect.

<Description of Effects> As explained above (according to the present invention, it is possible to record without any change in characteristics regardless of the diameter of the recording track), and the interference between two types of information signals can be reduced. It is an object of the present invention to provide an information signal recording device which can suppress the occurrence of signal deterioration in a small diameter portion of a track and prevent signal deterioration etc. with a simple configuration.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the frequency spectrum of a recording signal in Sv, FIG. 2 is a diagram showing the configuration of a recording apparatus as an embodiment of the present invention, and FIGS. Figure 1 shows a specific example of a circuit. 7#'i recording aperture, 10#i level adjustment circuit, 11 a head, 12 a sheet, 14 a head feeding mechanism, and 15 system controllers. Applicant Canon Co., Ltd.

Claims (1)

[Claims] 1) An apparatus for recording a mixed signal in which two or more different information signals are frequency-multiplexed while forming a circular track on a rotating recording substrate, and means for obtaining information on the diameter of the circular track; an information signal comprising: means for changing the mixing ratio of a first information signal distributed in a relatively high frequency band and a second information signal distributed in a relatively low frequency band; Recording device.