JPS62197983A - Signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To stably and exactly perform the monitoring operation of preview mode, by setting a delay recording signal in which a delayed quantity equivalent to the difference of angle of rotation between a recording head and a reproducing head is supplied to a recording signal, as a monitoring output. CONSTITUTION:As a delay circuit 14, a circuit having a delayed quantity (tau) corresponding to the difference theta of the angle of rotation between a magnetic head 6 and a reproducing head 8, is used, and it is constituted so that a delay digital recording signal is formed by giving the delayed quantity (tau) to the digital recording signal supplied from a recording processing circuit 2, and it is supplied to a reproduction processing circuit 12 through a switch circuit 10. As for the delay digital recording signal, the phase of which is coincided with that of a digital reproducing signal reproduced from a magnetic tape 7 by the reproducing head 8, and by controlling the switch circuit 10 so as to select the delay digital recording signal in the preview mode, a phase continuity between a signal recorded newly and the reproducing signal following the signal can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a signal recording and reproducing apparatus such as a digital video tape recorder, which is equipped with a reproducing head that is disposed offset by a predetermined rotational angle with respect to a recording head. .

[Summary of the invention]

The present invention provides a signal recording/reproducing device including a reproducing head disposed offset by a predetermined rotational angle with respect to the recording head, in which a delay amount corresponding to the rotational angle difference between the recording head and the reproducing head is applied to the recorded signal. By using the delayed recording signal as a monitor output, a so-called preview mode monitor operation can be performed stably and reliably during editing work.

(Prior Art) Generally, a helical scan type digital video tape recorder (D
-VTR), by immediately reproducing the signal recorded by the recording head by a reproduction head arranged at a predetermined rotation angle with respect to the recording head, the signal is ensured on the inclined recording track on the magnetic tape. Be sure to perform the recording operation while making sure that the information is being recorded.

In the above-mentioned D-VTR, there is a time difference between the recorded signal and the reproduced signal, which corresponds to the rotational angle difference between the recording head and the reproducing head.

Generally, when performing #Ja compilation work on a recorded videotape, it is necessary to ensure phase continuity between the newly recorded signal and the already recorded signal. When performing the so-called Brevigny mode operation in which the content of the signal to be recorded and the content of the recorded signal following this signal is performed, the servo of the rotating magnetic head device is activated for a time corresponding to the rotational angle difference between the recording head and the reproducing head. I was trying to change the phase. Therefore, in conventional VTRs, the servo latch of the rotating magnetic head device may come off at the timing of mode switching, and the playback screen may become distorted or the audio may become inaudible until it locks again.

[Problem that the invention seeks to solve]

As mentioned above, in conventional VTRs that operate in preview mode by controlling the servo phase of the rotating magnetic head device, the servo latch of the rotating magnetic head device comes off at the timing of mode switching, and the playback screen becomes distorted until it locks again. There was a problem that the sound could not be heard.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, the present invention provides a method for monitoring preview mode by giving a predetermined amount of delay to a recording signal and outputting it as a monitor instead of controlling the servo phase of a rotating magnetic head device. It is an object of the present invention to provide a signal recording and reproducing device with a novel configuration that can operate stably and reliably.

[Means for solving problems]

In order to solve the above-mentioned problems, the signal recording and reproducing device according to the present invention includes a recording processing circuit that supplies a recording signal to a recording head, and a recording processing circuit that is arranged to be shifted by a predetermined rotation angle with respect to the recording head. a reproduction processing circuit to which a reproduction signal obtained by the reproduction head is supplied; a delay circuit giving a recording signal output from the recording processing circuit a delay amount corresponding to a rotation angle difference between the recording head and the reproduction head; The apparatus is characterized by comprising a switch circuit that selectively supplies the delayed recording signal obtained through the delay circuit and the reproduction signal obtained by the reproduction head to the reproduction processing circuit.

[Effect]

In the signal recording and reproducing apparatus according to the present invention, the delay circuit gives the recording signal a delay amount corresponding to the rotational angle difference between the recording head and the reproducing head, and the delayed recording signal and the reproduction signal are transferred to each other by the switch circuit in the preview mode. By selectively supplying the signal to the playback processing circuit via the playback processing circuit, phase continuity between the newly recorded signal and the playback signal following the signal is ensured, and by monitoring the output of the playback processing circuit, the preview mode Monitor operation can be performed stably and reliably.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a signal recording and reproducing apparatus according to the present invention will be described in detail below with reference to the drawings.

The embodiment shown in the block diagram of FIG.
In this embodiment, the input recording signal supplied to the signal input terminal 1 is converted by the recording processing circuit 2 into a parallel digital recording signal. The digital recording signal obtained by the recording processing circuit 2 is converted into serial data by a parallel/serial (P/S) converter 3, and then provided to a rotary magnetic head device 5 via a recording amplifier 4. The recording data is supplied to the RAD 6 and recorded on the recording trunk on the magnetic tape 7.

In this embodiment, the rotating magnetic head device 5 includes:
In order to be able to reproduce the recorded signal while recording with the recording head 5, a reproduction head 8 is disposed at a position whose rotational phase is delayed by a predetermined rotational angle difference (θ) with respect to the recording head 6. be.

A digital reproduction signal of serial data obtained by the reproduction head 8 is supplied from a reproduction amplifier 9 to a serial-to-parallel (S/P) converter 11 via a switch circuit 10. The signal is converted into a digital reproduction signal and supplied to the reproduction processing circuit 12.

The reproduction processing circuit 12 converts the digital reproduction signal into an analog signal, reproduces a television signal of a predetermined standard television system, and supplies it to the monitor television receiver 20 from the signal output terminal 13.

Furthermore, in this embodiment, the digital recording signal obtained by the recording processing circuit 2 is supplied to the delay circuit 14. This delay circuit 14 has a delay M (τ) corresponding to the rotational angle difference (θ) between the recording head 6 and the reproducing head 8, and is used to delay the digital recording signal supplied from the recording processing circuit 2. The delay amount (τ) is applied to form a delayed digital recording signal, and this delayed digital recording signal is supplied to a parallel/serial (P/S) converter 15. The delayed digital recording signal is transmitted to the P/S converter 3.
is converted into serial data and supplied to the S/P converter 11 via the switch circuit 10.The S/P converter 11 converts it into a digital reproduction signal of parallel data and sends it to the reproduction processing circuit 12. is being supplied to.

The switch circuit 10 is supplied with a switching control signal from a system controller (not shown) to its control terminal 10A, and is controlled to select the delayed digital recording signal in the Brevigny mode.

In the embodiment having the above-mentioned configuration, the delay amount (
τ) is applied to the digital recording signal by the delay circuit 14, and the delayed digital recording signal is formed by the reproduction head 8.
By controlling the switch circuit 10 to select the delayed digital recording signal in the preview mode, the signal to be newly recorded and the signal are matched in phase with the digital reproduction signal reproduced from the magnetic tape 7. Subsequently, it is possible to ensure phase continuity with the reproduced signal. In addition, the delayed digital recording signal and the digital reproduction signal with phase continuity secured in this way are transferred to the switch circuit 10.
By switching over and monitoring the output of the reproduction processing circuit 12, the preview mode monitoring operation can be performed stably and reliably without causing signal disturbance when switching modes.

〔Effect of the invention〕

As is clear from the description of the embodiments described above, in the signal recording and reproducing apparatus according to the present invention, the delay circuit applies a delay amount corresponding to the rotation angle difference between the recording head and the reproducing head to the recording signal, and the delayed recording signal By selectively supplying the playback signal and the playback signal to the playback processing circuit via the switch circuit in the preview mode, it is possible to ensure phase continuity between the newly recorded signal and the playback signal following the signal, and the above-mentioned By monitoring the output of the reproduction processing circuit, the preview mode monitoring operation can be performed stably and reliably without causing signal disturbance when switching modes.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment in which the present invention is applied to a digital VTR. 1... Signal input terminal 2... Recording processing circuit 5...
・Rotating magnetic head device 6...recording head 7...magnetic tape 8...
Playback head 10... Switch circuit 12... Playback processing circuit

Claims (1)

[Claims] A recording processing circuit that supplies a recording signal to a recording head, and a reproduction processing circuit that is supplied with a reproduction signal obtained by a reproduction head that is arranged at a predetermined angle of rotation with respect to the recording head. a delay circuit that provides a recording signal output from the recording processing circuit with a delay amount corresponding to a rotational angle difference between the recording head and the reproducing head; and a delayed recording signal obtained via the delay circuit and the reproducing head. and a switch circuit for selectively supplying the reproduction signal obtained by the reproduction processing circuit to the reproduction processing circuit.