JP2586448B2 - Digital signal recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal recording / reproducing apparatus such as a digital video tape recorder having a reproducing head arranged at a predetermined rotation angle with respect to a recording head.

[Summary of the Invention]

The present invention relates to a recording processing circuit that converts an input recording signal into a parallel digital signal, and a first parallel serial signal that converts the parallel digital signal output from the recording processing circuit into a first serial digital signal. A converter, a recording head that records the first serial digital signal output from the first parallel-serial converter on a recording medium, and a recording head that is shifted by a predetermined rotation angle with respect to the recording head. And a reproduction signal reproduced from the recording medium by the reproduction head.
In a digital signal recording / reproducing apparatus having a serial / parallel converter for converting into a digital signal and outputting the signal, a delayed recording signal in which a delay amount corresponding to a rotation angle difference between a recording head and a reproducing head is given to the recording signal is monitored By using the output, the monitor operation in the so-called preview mode can be stably and reliably performed during the editing operation.

[Conventional technology]

Generally, in a helical scan type digital video tape recorder (D / VTR) in which a signal is recorded and reproduced by a rotation timing head device, the recording head is shifted to the recording head by a predetermined rotation angle with respect to the recording head. By immediately reproducing the recorded signal, the recording operation is performed while confirming that the signal is reliably recorded on the inclined recording track on the magnetic tape.
In the D.VTR described above, a time difference occurs between the recording signal and the reproduction signal for a time corresponding to the rotation angle difference between the recording head and the reproduction head.

Generally, when editing a recorded video tape, it is necessary to ensure the phase continuity between a newly recorded signal and a recorded signal. The servo phase of the rotating magnetic head device is changed by a time corresponding to the rotation angle difference between the recording head and the reproducing head when performing a so-called preview mode operation for confirming the content of the recorded signal following this signal. I was trying to make it. Therefore, in the conventional VTR, the servo lock of the rotary magnetic head device is released at the timing of mode switching, and the reproduced screen may be disturbed or the sound may not be heard until the rotary magnetic head device is locked again.

[Problems to be solved by the invention]

In the conventional VTR that controls the servo phase of the rotating magnetic head device to perform the preview mode operation as described above, the servo lock of the rotating magnetic head device is released at the timing of mode switching, and the playback screen is displayed until locked again. There was a problem that the sound was disturbed and the sound could not be heard.

Thus, the present invention addresses the conventional problems described above,
Instead of controlling the servo phase of the rotating magnetic head device,
It is an object of the present invention to provide a signal recording / reproducing apparatus having a novel configuration in which a monitoring operation in a preview mode can be stably and reliably performed by giving a predetermined delay amount to a recording signal to output a monitor.

[Means for solving the problem]

The present invention relates to a recording processing circuit that converts an input recording signal into a parallel digital signal, and a first parallel serial signal that converts the parallel digital signal output from the recording processing circuit into a first serial digital signal. A converter, a recording head that records the first serial digital signal output from the first parallel-serial converter on a recording medium, and a recording head that is shifted by a predetermined rotation angle with respect to the recording head. And a reproduction signal reproduced from the recording medium by the reproduction head.
A digital signal recording / reproducing device comprising a serial / parallel converter for converting and outputting a digital signal, wherein the parallel digital signal output from the recording processing circuit is converted into a rotational angle difference between the recording head and the reproducing head. A delay circuit for delaying by a corresponding time, a second parallel / serial converter for converting the parallel digital signal delayed by the delay circuit into a second serial digital signal, and a second parallel / serial converter. A switch circuit for selectively supplying the second serial digital signal output from the serial converter and the reproduced signal obtained by the reproducing head to the serial / parallel converter. Things.

[Action]

According to the present invention, a digital signal recording / reproducing device converts a parallel digital signal into a serial digital signal and records it on a recording medium, and then converts a reproduced signal reproduced by a monitor head into a parallel digital signal and outputs the signal. The device converts the input parallel digital signal to a serial digital signal after delaying by the time corresponding to the rotation angle difference of the recording head, and selectively converts the serial digital signal and the reproduction signal to a parallel digital signal. I do.

〔Example〕

Hereinafter, an embodiment of a signal recording / reproducing apparatus according to the present invention will be described in detail with reference to the drawings.

The embodiment shown in the block diagram of FIG.
In this embodiment, an input recording signal supplied to a signal input terminal 1 is converted by a recording processing circuit 2 into a digital recording signal of parallel data. A 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 arranged on a rotary magnetic head device 5 via a recording amplifier 4. Is supplied to the recording head 6
The information is recorded on a recording track on the magnetic tape 7.

In this embodiment, the rotating magnetic head device 5 is rotated by a predetermined rotation angle difference (θ) with respect to the recording head 6 so that a signal recorded while recording by the recording head 5 can be reproduced. The reproducing head 8 is disposed at a position where the phase is delayed. A digital reproduction signal of serial data obtained by the reproduction head 8 is supplied to a reproduction amplifier 9.
From the serial / parallel (S /
P / P converter 11 converts the data into a digital reproduction signal of parallel data by the S / P converter 11 and reproduces the data.
Supplied to

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 the television signal from a signal output terminal 13 to a monitor television receiver 20.

Further, in this embodiment, the digital recording signal obtained by the recording processing circuit 2 is supplied to the delay circuit 14. The delay circuit 14 has a delay amount (τ) corresponding to the rotation angle difference (θ) between the recording head 6 and the reproducing head 8, and is used for the digital recording signal supplied from the recording processing circuit 2. The delay amount (τ) is given 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 converted to serial data by the P / S converter 3 and supplied to the S / P converter 11 via the switch circuit 10, and the parallel data is converted by the S / P converter 11 into parallel data. , And supplied to the reproduction processing circuit 12.

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 so as to select the delayed digital recording signal in the preview mode.

In the embodiment having the above configuration, the recording head 6
A delay digital recording signal formed by giving a delay amount (τ) corresponding to a rotation angle difference (θ) between the digital signal and the reproducing head 8 to the digital recording signal by the delay circuit 14 is
The phase of the digitally reproduced signal reproduced from the magnetic tape 7 coincides with the phase of the digitally reproduced signal. 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 to be newly recorded are controlled. And the phase continuity with the reproduction signal that follows.
Further, by switching between the delayed digital recording signal and the digital reproduction signal having the phase continuity as described above by the switch circuit 10 and monitoring the output of the reproduction processing circuit 12, signal disturbance may occur at the time of mode switching. In addition, the monitor operation in the preview mode can be performed stably and reliably.

〔The invention's effect〕

As is apparent from the above description of the embodiment, in the signal recording / reproducing apparatus according to the present invention, the delay circuit gives the recording signal a delay amount corresponding to the rotation angle difference between the recording head and the reproducing head, And the reproduction signal are selectively supplied to the reproduction processing circuit via the switch circuit in the preview mode, whereby the phase continuity between the newly recorded signal and the reproduction signal following the signal can be ensured. By monitoring the output of the reproduction processing circuit, the monitor operation in the preview mode can be stably and reliably performed without causing signal disturbance at the time of mode switching.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment in which the present invention is applied to a digital VTR. DESCRIPTION OF SYMBOLS 1 ... Signal input terminal 2, 2 ... Recording processing circuit 5 ... Rotary magnetic head device 6 ... Recording head 7, Magnetic tape 8 ... Reproduction head, 10 ... Switch circuit 12 ... Reproduction processing circuit 13 ... … Signal output terminal, 14… Delay circuit 20… Monitor television receiver

Claims (1)

(57) [Claims] A recording processing circuit for converting an input recording signal into a parallel digital signal, and a first parallel digital signal for converting the parallel digital signal output from the recording processing circuit into a first serial digital signal. A serial converter, a recording head that records a first serial digital signal output from the first parallel-serial converter on a recording medium, and a recording head that is shifted by a predetermined rotation angle with respect to the recording head. And a reproduced signal reproduced from the recording medium by the reproducing head.
A digital signal recording / reproducing device including a serial / parallel converter that converts and outputs a digital signal, wherein the parallel digital signal output from the recording processing circuit is converted into a rotational angle difference between the recording head and the reproducing head. A delay circuit for delaying by a corresponding time; a second parallel-serial converter for converting the parallel digital signal delayed by the delay circuit into a second serial digital signal; A switch circuit for selectively supplying the second serial digital signal output from the serial converter and the reproduced signal obtained by the reproducing head to the serial / parallel converter. Digital signal recording / reproducing device.