JPH0246551A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To automatically set a fast forwarding mode on a nonrecording part and to automatically set a reproducing mode on a recording part during a reproducing operation by detecting the presence of a control signal as a reference signal for a control circuit and outputting its result to an operation circuit. CONSTITUTION:The recording part of a magnetic tape 1 is necessarily written with the control signal as the reference signal for the control system circuit. Since this control signal is utilized for a discriminating signal of whether the magnetic tape 1 is the recording part or nonrecording part, this signal is inputted to a control signal presence/absence discriminating circuit 5, and by its detecting output, the operation circuit 6 is controlled. That is, when the control signal is absent during the reproducing time, the operation circuit 6 is controlled by the output of this control signal presence/absence discriminating circuit 5 so as to set the fast forwarding mode, and when the control signal is present again, it is controlled to set the usual reproducing model. Thus, when the control signal is absent during the reproducing time, the fast forwarding reproducing mode is automatically set up, and the nonrecording part is skipped over automatically.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a feature that when reproducing a magnetic tape with an unrecorded zone, when an unrecorded zone is reached, the system automatically switches to fast forward mode, skips to the recorded section, and then returns to playback mode. The present invention relates to a magnetic recording and reproducing device that makes it possible to perform

[Conventional technology]

FIG. 2 shows a configuration diagram of a conventional magnetic recording/reproducing device. In this figure, 1 is a recorded magnetic tape, 2 is a control head that extracts a control signal from this magnetic tape 1 during reproduction, and 3 is an amplifier that amplifies the signal extracted by the control head 2. This control signal is input to the control circuit 4 as a reproduction reference signal, and the control circuit 4 controls the magnetic recording and reproduction apparatus. Further, 6 is an operation circuit, which controls the control circuit 4 according to the user's operation.

Next, the operation will be explained.

In a conventional magnetic recording and reproducing device, during reproduction, a control head 2 extracts a minute control signal from a magnetic tape 1 on which video signals and the like have already been recorded, and the signal obtained from this control head 2 is sent to a control signal amplifier 3. The amplified control signal is used as a reference signal for the control circuit 4 that controls the magnetic recording and reproducing device. Further, the user controls the magnetic recording and reproducing apparatus by operating the operation circuit 6 and controlling the control circuit 4.

As described above, in the conventional magnetic recording and reproducing apparatus, the user operates the operation circuit 6 to control the magnetic recording and reproducing apparatus.

[Problem to be solved by the invention]

As mentioned above, conventional magnetic recording and reproducing devices do not have a function to detect whether the currently reproduced part of the magnetic tape being played back is a recorded part or an unrecorded part. When playing a magnetic tape that has an unrecorded part at the beginning or middle of the tape, when the unrecorded part is played back, either wait until the next recorded part is played in normal playback mode, or use There is a problem in that the only method is for a person to fast-forward playback to a recorded portion while looking at the playback screen, and then switch to normal playback mode and view the reproduced image of the next recorded portion.

The present invention was made to solve the above-mentioned problems, and when there is an unrecorded part in the middle of the tape being played back, the unrecorded part is automatically detected and the unrecorded part is removed. It is an object of the present invention to provide a magnetic recording/reproducing device having a function of fast-forwarding in a fast-forwarding mode and returning to normal reproduction when the next recorded portion is reached.

[Means to solve the problem]

The magnetic recording and reproducing apparatus according to the present invention is provided with a circuit that detects the presence or absence of a control signal that is a reference signal for a control system circuit extracted from a magnetic tape during reproduction, and outputs the detection result to an operation circuit. be.

[Effect]

In the present invention, by detecting the presence or absence of a playback control signal, which is a reference signal for the control system circuit, and outputting the result to the operation circuit, when the control signal disappears during playback, that is, the tape becomes an unrecorded part. For example, the detection signal makes it possible to quickly skip over the unrecorded portion and go to the next recording section in a fast-forward mode.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
In the figure, 1 is a magnetic tape, 2 is a control head that takes out a control signal written on a part of the magnetic tape 1, 3 is an amplifier that amplifies the signal taken out from the control head 2, and 4 is amplified by this amplifier 3. This is a control circuit to which the control signal is input. Further, 5 is a control signal presence/absence discriminating circuit for determining the presence or absence of a control signal, and 6 is an operation circuit to which the output of the control signal presence/absence discriminating circuit 5 is input.

A control signal, which is a reference signal for a control system circuit, is always written in the recording portion of the magnetic tape l. Conventionally,
This control signal was only input to the control circuit 4 as a reference signal during playback of the control system circuit, but in this embodiment, this control signal is used as a signal for determining whether a recorded portion of the magnetic tape 1 is an unrecorded portion. In order to use it as a control signal, the control signal is input to a control signal presence/absence determination circuit 5, and the operation circuit 6 is controlled by the detection output. That is, during playback, the control head number (if it is, the operation circuit 6 is output from the control signal presence/absence determination circuit 5).
is controlled to enter the fast-forward playback mode, and when the control signal is received again, the normal playback mode is controlled.

In this way, in this embodiment, when the control signal disappears during playback, the mode automatically enters the fast-forward playback mode, so that unrecorded portions are automatically skipped, and the user can operate the operation circuit 6 as before. No need to operate.

In the above embodiment, a case has been described in which when an unrecorded part is entered, the unrecorded part is automatically skipped in the fast forward playback mode, but this may also be skipped in a simple fast forward mode, and the same procedure as in the above embodiment is made. It has the effect of

[Effects of the Invention] As described above, according to the magnetic recording and reproducing device according to the present invention,
The presence or absence of a control signal, which is a reference signal for the control system circuit, is detected and the result is output to the operation circuit. During playback, if an unrecorded part is reached, the system automatically switches to fast forward mode and quickly moves to the next recorded part. When the recording section is skipped, the mode can be automatically switched to the playback mode, which has the effect of simplifying the operation.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a magnetic recording and reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional magnetic recording and reproducing apparatus. 1 is a magnetic tape, 2 is a control head, 3 is a control signal amplifier, 4 is a control circuit, 5 is a control signal presence/absence determination circuit, and 6 is an operation circuit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] (1) In a magnetic recording and reproducing device that operates using a control signal extracted from a magnetic tape during playback as a reference signal and is equipped with a control circuit that controls each part of the device, the presence or absence of the control signal is determined, and the result is used to control the above. A magnetic recording/reproducing device characterized by comprising a control signal presence/absence determination circuit that outputs to an operation circuit for controlling the circuit.