JPH0487068A - Magnetic disk dubbing device - Google Patents

Abstract

PURPOSE:To attain a dubbing job to a 2nd magnetic disk in a proper recording timing by using a vertical synchronizing signal obtained from a reproduced video signal or a pulse signal obtained with revolution of a 1st magnetic disk as a reference phase servo signal of a recording medium. CONSTITUTION:A 1st magnetic disk DA is set in a reproduction state and the pulse signal obtained with revolution of the disk DA is used as a reference phase servo signal of a 2nd magnetic disk DB at reproduction of a voice signal. At reproduction of a video signal, the vertical synchronizing signal of a reproduced video signal is used as the reference phase servo signal of the disk DB. Thus the phase servo control is secured based on the vertical synchronizing signal of the reproduced video signal even though the recording timing of the video signal of the disk DA gets out of a rated range. Then a recording job is assured in a proper recording timing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to magnetic disks in which video signals and audio signals are recorded on different tracks, such as magnetic disks used as recording media for electronic still cameras. It relates to a dubbing device.

[Summary of the Invention] The present invention provides that when the reproducing means reproduces the video signal on the first magnetic disk, the vertical synchronization signal obtained from the reproduced video signal is used as a reference signal for the phase servo of the recording means, and the reproducing means uses the audio signal as a reference signal for the phase servo of the recording means. When reproducing the video signal of the first magnetic disk, the pulse signal obtained in accordance with the rotation of the first magnetic disk is used as a reference signal for the phase servo of the second magnetic disk of the recording means. Even if the recording timing deviates from the standard range, dubbing can be performed on the second magnetic disk with proper recording timing.

[Prior Art] An electronic still camera is configured to be able to record audio signals in addition to video signals on a magnetic disk, and the video signals and audio signals are recorded on separate tracks. A video signal for one field is recorded on one track, and in the case of frame recording, it is recorded on two tracks. As shown in FIG. 2, the recording format of such a magnetic disk is to record a video signal in a range of 7H±2H from the PG position.
It is determined that the start ID signal (recognition signal) of the audio signal is located within a range of 2H from the PC position. It is necessary to dub the recorded contents of the magnetic disk 7 onto another magnetic disk for purposes such as editing, and various dubbing apparatuses of this type have been proposed (see Japanese Patent Application Laid-Open No. 107369/1999, etc.). In the dubbing device, it is necessary to match the phase of the first magnetic disk in the reproduction state and the second magnetic disk in the recording state according to the above recording format, and generally the P of the first magnetic disk is
This is used as the reference signal for G-times signal phase servo.

[Problems to be Solved by the Invention] However, according to the above configuration, signals are recorded at the same position as the first magnetic disk. Therefore, if the video signal on the first magnetic disk deviates from the recording format standard shown in Figure 2, that is, if the VD signal is not recorded in the range of 7H ± 2H from the PG position, the video signal obtained by dubbing is The second magnetic disk also had the disadvantage that the recording format did not conform to the standard.

Therefore, the present invention provides a magnetic disk dubbing device that corrects and dubs to a second magnetic disk so that it conforms to the standard even if the video signal on the first magnetic disk is recorded out of compliance with the standard. That is the issue.

[Means for Solving the Problems] To solve the above problems, a magnetic disk dubbing apparatus according to the present invention includes a reproduction means for reproducing video signals and audio signals recorded on a first magnetic disk, and a reproduction means for reproducing video signals and audio signals recorded on a first magnetic disk. In a magnetic disk dubbing device comprising a recording device for recording the video signal and audio signal reproduced by the reproduction means on a second magnetic disk, when the signal reproduced by the reproduction means is a video signal, the reproduced video signal is recorded. The vertical synchronization signal obtained from the above is used as a reference signal for the phase servo of the recording means, and when the signal reproduced by the reproduction means is an audio signal, the pulse signal obtained according to the rotation of the first magnetic disk is used as the reference signal for the phase servo of the recording means. This signal is used as a reference signal for the phase servo of the recording means.

[Function] The first magnetic disk is put into a playback state, and the pulse signal obtained by the rotation of the first magnetic disk is used as the reference signal for the phase servo of the second magnetic disk when playing an audio signal, but when playing a video signal Sometimes, the vertical synchronization signal of the reproduced video signal is used as the reference for the phase servo of the second magnetic disk, so even if the recording timing of the video signal on the first magnetic disk is out of the standard range, the vertical synchronization signal of the reproduced video signal Phase servo is applied based on this, and recording is performed at appropriate recording timing.

[Example code] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a circuit block diagram of a dubbing device according to an embodiment of the present invention. In FIG. 1, the dubbing device consists of a reproducing means A and a recording means B, and the reproducing means A and the recording means B are constructed integrally or separately and independently. The reproducing means A has a disk drive means, and a first magnetic disk DA on which a video signal and an audio signal are already recorded is mounted on the disk drive means. A detected portion is provided at one location on the first magnetic disk DA, and a pulse generator (PG) 1 is provided at a position facing the detected portion on the rotation locus. This PCI outputs one pulse signal for each revolution of the first magnetic disk DA. The head HA is moved in the radial direction of the first magnetic disk DA by a head driving means (not shown), and the output of the head HA is led to a demodulation circuit 3 via a reproduction amplifier 2.

The video signal and audio signal demodulated by the demodulation circuit 3 are led to the recording means B, and also to the discrimination circuit 4 and the VD separator circuit 5. The discrimination circuit 4 discriminates whether the input is a video signal or an audio signal, and includes, for example, a synchronization separation circuit, and makes the discrimination based on whether or not a horizontal synchronization signal can be detected from the input signal. The determination result of the determination circuit 4 is sent as a switching control signal to the changeover switch SW described below. The VD separation circuit 5 extracts a vertical synchronizing signal (VD) from the video signal and outputs the extracted vertical synchronizing signal to the selection terminal a of the changeover switch SW of the recording means B.

The output of the PCI is led to the 7H delay circuit 6, and the 7H
The delay circuit 6 delays the pulse signal by seven horizontal line scanning sections. The VD signal recorded on the magnetic disk is P
Since the position is delayed by the standard 7H from the G position, the pulse signal is at almost the same position as the VD signal. 7H delay circuit 6
The output is then shaped into a signal in the same format as the VD signal by the waveform shaping circuit 7, and output as a pseudo VD signal to the selection terminal of the changeover switch SW of the recording means B via the buffer 8.

The recording means B, like the reproducing means A, has a disk drive means, and a second magnetic disk D for dubbing signals is attached to this disk drive means. The video signal and audio signal reproduced by the reproduction means A are guided to the head H1 for recording on the second magnetic disk Dm via the modulation circuit 9 and the recording amplifier 10. On the other hand, selector switch S
W is for selecting a VD signal or a pseudo VD signal, and when the discrimination circuit 4 outputs a discrimination signal indicating a video signal, it is output to the VD signal selection terminal a, and when a discrimination signal indicating an audio signal is output, the discrimination signal indicating an audio signal is output. It is controlled to be connected to the selection terminal of the pseudo VD signal. The output of this changeover switch SW is output to the phase control circuit 11. The output of PCl3 of the reproducing means B is also led to the phase control circuit 11.
1 outputs a phase error signal to the drive circuit 13 in order to lock the phase so that the VD signal or pseudo VD signal comes to the rotational position 7H from the PG position of the second magnetic disk D. The drive circuit 13 outputs a drive signal to the motor 14 based on this phase error signal, and the rotation of the motor 14 rotates the second magnetic disk D8.

The operation of the above configuration will be explained below.

When the first magnetic disk DA rotates, the magnetic disk HA picks up the recorded signal and generates a playback signal (playback track).
When is a video signal, a VD signal is guided from the VD separation circuit 5 to the changeover switch SW, and a pseudo VD signal shaped from a pulse signal is guided from the waveform shaping circuit 7 to the changeover switch SW regardless of the type of reproduced signal. When the reproduced signal is an audio signal, a pseudo VD signal is output to the phase control circuit 11, and the rotational phase of the second magnetic disk DB is controlled to match that of the first magnetic disk DA,
The audio signal reproduced on the first magnetic disk DA is recorded on the second magnetic disk DB.

Further, when the reproduction signal is a video signal, a VD signal is output to the phase control circuit 11, and the rotational phase of the second magnetic disk DB is adjusted to that of the first magnetic disk DA based on this VD signal.
controlled to suit. Therefore, the first magnetic disk D
A's PCI detection time and PG1 of the second magnetic disk DB
The phase is not controlled to match the two detection points, but V
Since the phase is controlled so that the D signal detection point is delayed by 7H from the PG12 detection point, the recording timing of the video signal on the first magnetic disk DA is within the standard range (PG
The second magnetic disk D is recorded at the proper recording timing even if it is deviated from the position (7H±2H).

is dubbed.

[Effects of the Invention] As described above, according to the present invention, when the reproducing means reproduces the video signal of the first magnetic disk, the vertical synchronization signal obtained from the reproduced video signal is used as the reference for the phase servo of the recording means. When the reproduction means reproduces the audio signal, the pulse signal obtained in accordance with the rotation of the first magnetic disk is used as the reference signal for the phase servo of the second magnetic disk of the recording means. Even if the recording timing of the video signal on the second magnetic disk deviates from the standard range, dubbing can be performed on the second magnetic disk at the appropriate recording timing.

[Brief explanation of drawings]

FIG. 1 is a circuit block diagram of a dubbing device showing an embodiment of the present invention, and FIG. 2 is a diagram showing a recording format of a magnetic disk. A...Reproducing means, B...Recording means, DA...First
magnetic disk, Da... second magnetic disk. Figure 1 shows λh Qi Te and 0 officials and Natsume Huonut Figure 1 Figure 2

Claims (1)

[Claims] (1) Comprising a reproduction means for reproducing the video signal and audio signal recorded on the first magnetic disk, and a recording means for recording the video signal and audio signal reproduced by the reproduction means on the second magnetic disk. In the magnetic disk dubbing apparatus, when the signal reproduced by the reproduction means is a video signal, a vertical synchronization signal obtained from the reproduced video signal is used as a reference signal for the phase servo of the recording means, and the signal reproduced by the reproduction means is used as a reference signal for the phase servo of the recording means. 2. A dubbing apparatus for a magnetic disk, characterized in that when the signal obtained by the recording is an audio signal, a pulse signal obtained in response to the rotation of the first magnetic disk is used as a reference signal for phase servo of the recording means.