JPS58222669A - Information recording system - Google Patents

Abstract

PURPOSE:To avoid fluctuation of time axis from taking place in the recorded information, by correcting the time axis of a drive signal for a solid-state image pickup element in response to the relative speed between a recording medium and a head. CONSTITUTION:A clock pulse obtained from a clock pulse generator 5 is phase- modulated with an output of a speed error detector 9 at a phase modulator 12 as a time axis correcting means. The phase-modulated clock pulse is amplified at a clock driver 6 and inputted to a CCD 1. A picture signal obtained from the CCD 1 is processed into a television signal at a recording signal processing circuit 2, given to a magnetic head 3 and recorded on a magnetic disc 4. A motor 7 rotating the magnetic disc 4 is controlled with outputs of a phase comparator 8 and the speed error detector 9.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information recording system, particularly an information recording system for recording information obtained from a solid-state image sensor.

Generally, when information is recorded onto a recording medium via a head, it is necessary to maintain a constant relative speed between the head and the recording medium. For this purpose, a control circuit is provided that constantly detects the relative speed and keeps the relative speed constant.

If information is recorded in a state where relative speed fluctuations occur during recording, the recorded information will have time axis fluctuations, and when this information is played back, the reproduced information will also have time axis fluctuations. This is because

In recent years, various systems for recording information read from solid-state image elements have been devised, and these systems are also provided with a control circuit for keeping the relative speed constant as described above.

In the following, this type of system will be described by taking as an example a system in which a telepicture/signal for one field obtained from a solid-state image pickup device is recorded on a concentric recording trajectory of a rotating magnetic disk.

FIG. 1 is a diagram showing an example of a conventional system of this type.

1 is a CCD as a solid-state imaging device; 2 is a recording signal processing circuit that processes image signals obtained from the CCD into a format recordable on a magnetic disk 4 as a recording medium; 5 is an output of the recording signal processing circuit 2; A magnetic head for recording information on a magnetic disk 4. 5 is a clock generator that generates clock pulses as driving signals for the CCD; 6 is a clock driver that amplifies the clock pulses; 7 is a motor that rotates the magnetic disk 4; 8 is a signal related to the rotation phase of the motor 70 (hereinafter referred to as PQ). a phase comparator for comparing the phase of the reference signal obtained from the clock generator 5 with the reference signal obtained from the clock generator
is a mixer 1 which mixes the signal regarding the difference regarding the rotational speed of the motor 70 and the speed error obtained from the speed error detector 9;
1 is an amplifier.

In the above configuration, the rotational speed and rotational phase of the motor 7 are controlled to be always constant. That is, when recording one soybean worth of television signals during one rotation of the magnetic disk 4, the rotational speed of the magnetic disk 4 is always set to 36 per minute.
00 rotations (one rotation per 1 Aθ second).

However, in the configuration of the control circuit as shown in Fig. 1, although the rotational speed is controlled to be constant, it is impossible to completely reduce the rotational speed.
(When recording a television signal of 262.5 horizontal synchronization periods (hereinafter referred to as H))
A signal of 262.5 H±aH will be recorded in one rotation. If this is reproduced as a television signal for one frame and a new television signal is created, 68
If the magnetic disk 4 rotates at exactly 3,600 revolutions per minute during playback, a skew of 5° will occur on the playback screen.
There were drawbacks such as the length of the screen also changed, causing shaking on the screen.

The present invention provides means for generating an information recording system that eliminates the above-mentioned drawbacks, a head for recording information obtained from a nuclear solid-state image sensor on a recording medium, and a means for detecting the relative speed between the recording medium and the head. It is an object of the present invention to provide an information recording system having a means for correcting the time axis of the drive signal according to the detection wealth means.

FIG. 2 is a diagram showing an information i-recording system that is an embodiment of the present invention. Components having the same configuration as those in FIG. 1 are given the same reference numerals and their explanations will be omitted.

The clock pulse obtained by the clock generator 5 is phase modulated by the output of the speed error detector 8 by a phase modulator 12 serving as a time axis correction means.

The phase-modulated clock pulse is amplified by the clock driver 6 to send out the image signal obtained by the CCD 1.
It is input to D1. The image signal obtained from the CCD 1 is converted into a television signal by the recording signal processing circuit 2 and transmitted to the magnetic head 6, where it is recorded on the magnetic disk 4. The motor 7 that rotates the magnetic disk 4 uses a phase comparator 8 to compare PG obtained from a PG generator (not shown) mounted on the motor 7 and a reference signal obtained from the clock generator 5.
The phase of one rotation is controlled by the output of the motor 7.
The rotational speed is controlled by the output of a speed error detector 9, which receives a signal obtained from an FG generator (not shown) attached to the engine.

Further, the output of the speed error detector 9 is transmitted to a phase modulator 12 to phase modulate the clock pulse from the clock generator 5. That is, by phase modulating the clock pulse that drives the CCD 1, it is intended to read out the number of images ilJ having the same time axis fluctuation as the motor 7.

As a result, 262.5 H (1
The signal during the vertical phase period) will be recorded.

Therefore, in the configuration shown in FIG. 2 above, the motor 7 at the time of recording
Even if there are rotational speed fluctuations, a television signal with no time axis fluctuations can be obtained during playback. Therefore, the screen does not skew or shake during playback.

In this specification, a system in which one field worth of television signals obtained from COD is recorded on a concentric recording trajectory of a rotating magnetic disk will be explained as an example.
The present invention can be applied to any system in which information obtained from a solid-state image sensor is recorded onto a recording medium using a head at a certain relative speed. For example, it is also applicable to a video tape recorder (integrated type v'r iL) that integrally incorporates a video camera using a solid-state image sensor.

Further, in the above embodiment, a CCU is used as the solid-state image sensor, but a MOB may also be used.

Furthermore, as a means for time-base correcting the drive signal, it is also possible to use other elements such as a variable delay device (although the phase modulator 12 is used in the above embodiment).

Furthermore, in the above embodiment, a relative speed is generated between the head and the recording medium due to the rotation of the magnetic disk, and the relative speed is detected by detecting the number of rotations (rotational speed) of the motor that rotates the magnetic disk. However, as in the above-mentioned integrated VTR, it is also possible that relative speed is generated by the rotation of the head side. In order to detect the relative speed in this case, it is naturally necessary to detect the number of revolutions (rotational speed) of the motor that rotates the head.

Further, as a method for detecting the relative speed, methods other than detecting the rotational speed of a drive unit such as a tartar may be considered.

For example, the speed (rotation speed) of the recording medium or the Mori head itself
If the drive unit is a motor, there is a method to detect the back electromotive force. The present invention can also be applied to

As explained above, according to the information recording system of the present invention, even if a base change occurs in the relative speed between the recording medium and the head during recording, once recorded information does not undergo time axis fluctuation. Therefore, good reproduction information can be obtained.

[Brief explanation of the drawing]

Figure 1 shows an example of a conventional information recording system, Figure 2 shows an example of a conventional information recording system.
The figure shows an information recording system that is an embodiment of the present invention. 1. A CCD as a solid-state image sensor, 3.Ti head, 4. A magnetic disk as a recording medium, 5. A clock generator as means for generating a Fi drive signal, 9 is a speed error detector as a means of detecting relative speed; 12
is a phase modulator as a time axis correction means.

Claims (1)

[Claims] 1) a solid-state image sensor, a means for generating a drive signal for driving the solid-state image sensor, a head for recording information obtained from the solid-state image sensor onto a recording medium, and the recording medium and a core. An information recording system comprising: means for detecting a relative speed with respect to a head; and means for correcting the time axis of the drive signal according to the detecting means.