JP2662056B2 - Signal recording / reproducing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a video and audio signal recording / reproducing apparatus such as a VTR.

2. Description of the Related Art In recent years, video / audio signal recording / reproducing devices such as VTRs have achieved high image quality and high sound hardening, and are shifting from conventional analog recording to digital recording. In a digital VTR that digitally records a video signal and an audio signal, an input analog signal is converted into a digital signal, and then the data is scattered within a predetermined period (shuffling) and an error correction code is added and recorded. At the time of reproduction, an error is corrected based on the error correction code, the dispersed data is returned to the original state (deshuffling), and then converted to an analog signal and output. As described above, since the processing is performed in units of a certain period, it takes time for the processing at the time of recording and reproduction. This process is performed in units of 1/3 field or 1 field of the video signal. On the other hand, the VTR simultaneously records an analog audio signal (cue signal) and a time code in addition to the digital signal. Since recording and reproduction of these cue signals and time codes do not have a time delay unlike digital signals,
When recording and reproduction are performed by the same head, a problem occurs that a digitally recorded signal is delayed from a cue signal or a time code. In order to solve this problem, there is a method of reproducing a digital signal using a reproducing head preceding a recording head.

FIG. 4 shows an example of a recording / reproducing apparatus having such a function.

In FIG. 4, a signal input to a signal input terminal 1 is guided to a recording signal processing circuit 2 and subjected to necessary processing for recording, and then recorded on a tape 5 through a recording amplifier 3 and a recording head 4. . The input signal is guided to the switch 9, output from the signal output terminal 10 via the E1 terminal of the switch 9, and monitored.

The reproducing head 6 is arranged at a position preceding the recording head 4 by a time corresponding to a total processing time of recording and reproducing of a signal to be digitally recorded and reproduced. The signal reproduced by the reproduction head 6 is guided to a reproduction signal processing circuit 8 through a reproduction amplifier 7, subjected to reproduction processing, and output from an output terminal 10. A combined signal is obtained.

At the time of editing, by switching the switch 9 from P1 to E1 at the time of recording, the editing point is monitored at the output terminal 10 and the signal after passing through the recording signal processing circuit 2 and the recording amplifier 3 is recorded by the recording head 4. I do.

Problems to be Solved by the Invention However, in the above-described conventional configuration, an output signal during recording does not pass through the recording signal processing circuit 2 and the reproduction signal processing circuit 8, so that even if these circuits are out of order, they cannot be found. .

An object of the present invention is to provide a device that solves such a problem.

Means for Solving the Problems In order to achieve the above object, a signal recording / reproducing apparatus according to the present invention comprises: a set of recording heads mounted on a rotating surface having the same height; A reproducing head located on a rotating surface at a height preceding by the time required for processing, an editing function for continuously recording new signals on a recorded signal trajectory on a tape, and a recording signal as a signal output at the time of recording Output means for selecting whether to output a first signal that has been subjected to processing and reproduction signal processing or to output a second signal that bypasses part or all of the signal processing; Is output from the reproduction head when the transition from reproduction to recording is performed and the signal subjected to reproduction signal processing is output from the reproduction signal to the second signal, and when the transition from recording to reproduction is output from the reproduction head. Is There is means for switching to a signal that has undergone reproduction signal processing.

Also, in the present invention, the selection means can select any of the first and second signals at the time of normal recording, and forcibly wash the second signal at the time of editing and recording regardless of the setting.

Operation According to the above configuration, the operation of the circuit system can be checked at the time of recording by outputting the first signal subjected to the recording signal processing and the reproduction signal processing as the signal output at the time of normal recording or monitoring. Also, at the time of editing recording,
By outputting the second signal bypassing the circuit system to minimize the delay from input to output,
You can monitor the exact edit points.

Embodiment FIG. 1 is a block diagram of a signal recording / reproducing apparatus according to an embodiment of the present invention, FIG. 2 shows a head arrangement on a rotary cylinder in the embodiment, FIG. 2 (a) is a plan view, FIG. FIG. 2B is a front view.

In FIG. 1, the same components as those in FIG. 4 are denoted by the same reference numerals, and perform the same operations.

In FIG. 2, A and A 'are recording heads, and B and B' are reproducing heads.

As in the case of FIG. 4, a signal input to the signal input terminal 1 is guided to a recording signal processing circuit 2 and subjected to processing necessary for recording, and then is applied to a tape 5 through a recording amplifier 3 and a recording head 4. Be recorded. The output of the recording signal processing circuit 2 is led to a reproduction signal processing circuit 8 via a terminal E2 of a switch 11, subjected to processing, and then passed through a P1 terminal of a switch 9 to a signal output terminal.
The signal is output as the first signal from 10 and is monitored while checking the circuit system.

The switch 11 is a switch for switching between outputting a signal (EE system) passing through a circuit system and outputting a reproduced signal. Then, it is connected to the E2 side during the EE system, and to the P2 side during reproduction. The switch 9 is a switch for switching between outputting an input signal as a second signal not passing through the recording signal processing circuit 2 and the reproduction signal processing circuit 8 or outputting an EE system or a reproduction signal. When it is connected to the E1 side, when it is the latter, it is connected to the P1 side. In this embodiment, the signal from the E1 side bypasses all of the signal processing. However, a part of the circuit system may be bypassed so as to minimize the delay from input to output.

During normal recording (including the EE system), the switch 9 can be connected to the E1 side or to the P1 side, and can be selected.
It is possible to select whether to monitor a signal that has passed through the circuit system or to monitor a signal that has not passed.

At the time of normal reproduction, the switch 11 is connected to the P2 side and the switch 9 is connected to the P1 side, and the time corresponding to the total processing time of recording and reproduction of the digitally recorded / reproduced signal (the height h in FIG. 2 (b)). The signal reproduced by the reproducing head 6 disposed at a position preceding by () corresponds to the reproducing signal processing circuit 8 through the reproducing amplifier 7 and the switch 11, and after being subjected to the reproducing process, passes through the switch 9. The signal is output from the output terminal 10, and a signal that matches the timing of the cue signal or the time code is obtained at the output terminal 10.

When editing, switch 9 automatically switches to P1 when you want to record.
Is switched to E1, and the editing point can be monitored at the output terminal 10. At the same time, the signal after passing through the recording signal processing circuit 2 and the recording amplifier 3 is recorded by the recording head 4.

Hereinafter, the connection at the time of editing will be described with reference to FIG.

In FIG. 3, 12 is an input signal sequence applied to the signal input terminal, 13 is a signal sequence at the time of recording by the recording head 4, 14 is a signal sequence at the time of reproduction by the reproduction head 6, and 15
Is a signal sequence at the output of the reproduction signal processing circuit 8, and 16 is a signal sequence at the signal output terminal 10. S1, S2, S3,... Represent signal sequences recorded on the tape, and each of them is one field. Also, C1, C2, C3,... Represent an input signal sequence, and each of them is also assumed to be one field.

Now, assuming that the time required for the recording signal processing is one field, the signal sequence 13 is delayed by one field from the signal sequence 13. If the time required for the reproduction signal processing is 1.5 fields, the signal sequence 15 is delayed by 1.5 fields from the signal sequence 14. Between the recording head 4 and the reproducing head 6, there is provided a step corresponding to the total signal processing time of recording and reproduction, that is, 2.5 fields. Therefore, when the recording head 4 is at the position for recording C1 of the signal sequence 13 in FIG. 3, the reproducing head 6 is at the position for reproducing S1 of the signal sequence 14.

At the time of editing / playback, playback control is performed in synchronization with the input signal, and S1, S2, S3,...
2, C3,... Are controlled so as to have the same timing. Therefore, if it is desired to perform editing so as to newly record C4 and subsequent portions of the input signal sequence 12 from the position of S4 of the signal sequence 15 already recorded, the switch 9 is switched at the point A in FIG.
Is switched from P1 to E1 and recording is started at time B, ie, when the recording head 4 approaches C4 of the signal sequence 13. In this way, the same connecting signals as those actually edited and recorded can be monitored at the signal output terminal 10 (signal train 16 in FIG. 3).

As described above, according to the present invention, the circuit system can be checked by the EE system, and at the time of editing, an accurate edit point can be monitored.

[Brief description of the drawings]

FIG. 1 is a block diagram of a signal recording / reproducing apparatus according to one embodiment of the present invention, FIG. 2 is a plan view and a front view showing a head arrangement on a rotary cylinder in the embodiment, and FIG. FIG. 4 is a block diagram of a signal recording / reproducing apparatus showing a conventional example. 2 ... Recording signal processing circuit, 3 ... Recording amplifier, 4 ... Recording head, 6 ... Reproduction head, 7 ... Reproduction amplifier, 8 ...
... Reproduction signal processing circuit, 9,11 ... Switch.

Claims (2)

(57) [Claims] 1. A helical scan type signal recording / reproducing apparatus for recording / reproducing a signal on / from a magnetic tape, comprising: a set of recording heads mounted on a rotating surface having the same height; A reproducing head located on a rotating surface at a height ahead of the time required for signal processing and reproduction signal processing, an editing function for continuously recording new signals on a recorded signal trajectory on tape, and during recording or monitoring As a signal output at the time, whether the first signal subjected to the recording signal processing and the reproduction signal processing is output,
Selecting means for selecting whether to output a second signal bypassing a part or all of the signal processing, wherein the output at the time of editing is output from the reproducing head when a transition from reproduction to recording is performed; Means for switching from the signal subjected to the above to the second signal, and from the second signal to the signal outputted from the reproduction head and subjected to the reproduction signal processing when the transition from the recording to the reproduction is performed. Signal recording / reproducing device. And a selection means for selecting either of the first and second signals during normal recording and monitoring, and forcibly selecting the second signal during editing and recording irrespective of the setting. The signal recording / reproducing apparatus according to claim 1, wherein: