JPH01152877A - Fade-in fade-out device - Google Patents

Abstract

PURPOSE:To easily obtain a normal information signal by recording the information signal on a recording medium while not being faded and applying fade-in/ fade-out to a reproduced information signal in response to a control signal at reproduction so as to erase the control signal in case of elimination of the fade operation. CONSTITUTION:A control signal reproduced by a control head 7 is fed to a phase control circuit 20 via an amplifier 19 to control the rotating phase of a rotary head 9. Moreover, the output of the amplifier 19 is given to a fade gain control signal generator 21, where the change in the duty ratio of the reproduced control signal is detected to generate a fade-in or fade-out signal for a predetermined period. The fade-in or fade-out signal is fed to a gain control amplifier 17, the gain is controlled to obtain the video signal subject to fade-in or fade-out.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a fade-in/fade-out device used in a magnetic recording/reproducing device (VCR) or the like.

2. Description of the Related Art Conventionally, video or audio signals have been faded in or out in order to obtain visual or auditory effects. In other words, during recording, the level of the information signal to be recorded is gradually decreased (fade in).
, or are gradually increased (fade out) and recorded on a recording medium.

Problems to be Solved by the Invention However, in the above configuration, since the information signal is already faded in and faded out during recording, it is difficult to use the fade operation frequently during playback, or to make errors in the timing of the fade position. Even if I noticed it, it was impossible to fix it.

The present invention provides a fade-in/fade-out device that solves this problem.

Means for Solving the Problems A fade-in/fade-out device of the present invention that solves the above problems records an information signal to be recorded on a recording medium and also controls the recording of a control signal indicating a section to be faded in or faded out. The information signal is recorded on a medium, and the level of the reproduced information signal is controlled in accordance with the control signal during reproduction.

Operation According to the above configuration, the information signal is recorded on the recording medium in an unfaded state, and during playback, the information signal is
Since the reproduced information signal is faded in and faded out, if it is desired to eliminate the fade operation, a normal information signal can be easily obtained by erasing the control signal.

Embodiment Hereinafter, an embodiment of the present invention will be described using a VTR as an example with reference to the drawings.

FIG. 1 is a block diagram showing the main parts of the recording system of the same embodiment. Reference numeral 1 denotes an input terminal to which a control signal recorded to control the rotational phase of the rotary head during reproduction is applied. A signal generator 2 generates a fade-in control signal and a fade-out control signal in response to the operation of a fade-in operation switch 3 and a fade-out operation switch 4, which are pressed at the start of a fade-in operation and a fade-out operation, respectively. 5 is a modulator that changes the duty of the control signal applied to the input terminal 1 according to the application of the fade-in control signal and the fade-out control signal, and the output of this modulator 6 is connected to the recording amplifier 6. The control head 7 records the data on the magnetic tape 8 via the control head 7.

On the other hand, the video and audio signals are recorded on the magnetic tape without changing their levels even during a fade operation. That is, when you want to perform a fade operation during recording, if you press the fade-in operation switch 3 or the fade-out operation switch 4, the fade-in or fade-out control signal indicating the start of the fade operation is transferred onto the tape as a change in the duty of the control signal. is configured to be recorded.

FIG. 2 shows a block diagram of the reproduction system, in which the video signal reproduced by the rotary head 9 is separated into a luminance signal component and a color signal component by a separation circuit 1o, and a luminance signal processing circuit for each component. 11 and a color signal processing circuit 12, the signal is demodulated into the original luminance signal and color signal, and then the synchronization signal and burst signal are removed by a synchronization signal separation circuit 13 and a burst gate circuit 14, respectively. The luminance signal and chrominance signal from which the synchronization signal and burst signal have been removed are mixed in a mixer 16 and then applied to a gain control amplifier @M17.

On the other hand, the synchronization signal separation circuit 13 and the burst gate circuit 14
The synchronization signal and burst signal separated by are waveform-shaped by a waveform shaping circuit 16, and then mixed with the output of the gain control amplifier 17 by a mixer 18 to form a composite television signal.

On the other hand, the control signal reproduced by the control head 7 is applied to the phase control circuit 2o via the amplifier 19, and the rotational phase of the rotary head 90 is controlled by conventionally known means. The output of the amplifier 19 is also applied to a fade gain control signal generator 21, which detects changes in the duty of the reproduction control signal and generates a fade-in or fade-out signal for a predetermined period.

This fade-in or fade-out signal is applied to the gain control amplifier 17, and the gain is controlled so that a fade-in or fade-out video signal can be obtained.

According to the above configuration, if a fade operation is not desired at all during playback, it is sufficient to stop the operation of the fade gain signal generator 21, for example, and in order to effectively perform a fade operation, the fade operation If it is desired to add or delete a control signal, it is sufficient to re-record only the control signal using conventionally known means.

In the above embodiment, the duty of the control signal as a signal for controlling the fade operation is changed and recorded. If it is not possible to distinguish between the two, it is also possible to change the period of occurrence and record it superimposed on the audio signal.

Effects of the Invention As described above, according to the present invention, it is possible to perform a fade operation during playback without changing the level of an information signal such as a video signal during recording, so it is also possible to cancel the fade operation during playback. It is what it is.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a recording system showing an embodiment of a fade device of the present invention, and FIG. 2 is a block diagram showing main parts of a reproduction system of the same fade device. 1... Control signal input terminal, 3...
...Fuction-doin operation switch, 4...Fade-out operation switch, 5...Modulator, 17.
... Gain control amplifier, 21 ... Fade control signal generator. Name of agent: Patent attorney Toshio Nakao and 1 other person
Ward a-he group taste-8
I

Claims (1)

[Claims] Recording an information signal to be recorded on a recording medium, and recording a control signal indicating a section to be faded in or faded out on the recording medium, and controlling the reproduced information signal according to the control signal during reproduction. A fade-in/fade-out device featuring