JPS59194578A - Video tape recorder - Google Patents

Abstract

PURPOSE:To adjust the input level of a video signal by connecting a variable resistor to the input side of an RF converter when a signal outputted from a video tape recorder is to be reproduced by a TV receiver. CONSTITUTION:The variable resistor 5 is inserted between a video signal circuit 2 and the RF converter 4. When a video signal is excessively modulated and a buzz is generated in a voice, the input signal level of the RF converter 4 is reduced by adjusting the variable resistor 5 to smooth the excessively modulated state.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a video tape recorder for recording and reproducing television signals.

A video tape recorder generally has a function of receiving and recording a television broadcast signal, and a function of supplying this recorded signal to a television receiver and playing it back. By the way, it is known that the signals transmitted from each broadcasting station may have a slightly different video signal to audio signal ratio, and that the strength of the received signal varies depending on the position and direction of the receiving antenna. Furthermore, in video tape recorders and television receivers, signal fluctuations due to variations in component performance, variations in adjustment, etc. cannot be avoided. For this reason, when a signal from a video tape recorder is reproduced by a television receiver, the video signal is overmodulated and mixed into the audio signal, resulting in the generation of a buzz sound. Such drawbacks are due to the fact that television receivers are not manufactured with video tape recorders in mind.
All of the problems are considered to be defects in the video tape recorder, and the situation has become unavoidable.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and provides a video tape recorder in which the input signal level can be adjusted.

Hereinafter, the present invention will be explained with reference to the drawings which are one embodiment.

In FIG. 1, (1) is a tuner that receives a signal from a receiving antenna, and (2) is a video signal circuit that records an iron source signal from tuner (1) and reproduces this recorded signal.
Magnetic head (2a), recording circuit (2b), reproducing circuit (2)
C) and changeover switches (2d) and (2e). (3) is an audio signal circuit formed in the same way according to the recording or playback state of the video signal circuit (2);
) is an RF that converts the output signals of the video signal circuit (2) and audio signal circuit (3) and outputs them to a television receiver, etc.
The converter (5) is a variable resistor inserted between the video signal circuit (2) and the RF converter (4) to adjust the input level in the RF converter (4).

When recording a television signal under such a configuration, the output signal of the tuner (1) is supplied to the magnetic head (2a) via the recording circuit (2b) to record it on the magnetic tape. becomes possible. At this time, the output signal of the tuner (1) is supplied to the television receiver through the changeover switch (2d), -OJ variable resistor 5), and RF converter (4), and the video being recorded can be monitored. I can do that. Next, when reproducing the signal recorded on the magnetic tape, disconnect the tuner (1) and recording circuit (2b) from the magnetic head (2a) and connect the reproducing circuit (2C) to the magnetic head (2a). This is made possible by supplying this output signal to a television receiver via an RF converter (4).

Under such a configuration, if the video signal is overmodulated due to the strength of the transmitted signal from the broadcasting station, the signal content of subtitles, teletext, etc., the temperature characteristics of the RF converter (4), etc., and buzz occurs in the audio. , variable resistor (5
) to lower the input signal level of the RF converter (4), it becomes possible to eliminate the overmodulation state. Here, by providing the knob of the variable resistor (5) on the outer periphery of the cabinet of the video tape recorder, it is possible to have the user directly operate it, and it becomes easy to deal with complaints and the like.

By providing the variable resistor (5), there are also advantages such as brightening the image on the television receiver when the entire image is clear and preventing white collapse when the image is bright.

Further, in the above embodiment, a video tape recorder having a tenth unit (1) has been described, but it is also possible to implement the same method in a device that does not have a built-in tuner (1) unit, such as a portable video tape recorder. It is.

As explained above, according to the present invention, it is possible to guarantee the quality of a video tape recorder for a television receiver, etc., and the present invention has great practical value.

[Brief explanation of drawings]

Figure 1 is a process diagram showing a video tape recorder which is an embodiment of the present invention. In the figure, (1) is a tuner, (2) is a video signal circuit, (3) is an audio signal circuit, and (4) is a tuner.
) is an RF converter, and (5) is a variable resistor. Agent Masuo Oiwa (and 2 others)

Claims (2)

[Claims] (1) In a device that selectively supplies a video signal from a tuner or a magnetic head to an RF converter to form an output signal, a variable resistor is connected to the input side of the RF converter to adjust the input level of the video signal. A videotape recorder characterized by being adjustable. (2) The video tape recorder according to claim 1, wherein the variable resistor is operable from the outside.