JPH0248878A - RF converter circuit for video equipment - Google Patents

Abstract

PURPOSE:To vary a sound volume of a television receiver receiving a high frequency (RF) signal optionally by using a remote controller so as to adjust the level of an audio signal prior to the acquisition of an audio FM signal. CONSTITUTION:Before the carrier of an oscillated frequency of an oscillator 3 is subject to frequency modulation at an FM modulator 2 by using a reproduced audio signal as a modulation signal, the audio signal level is varied optionally by a digital volume 14. When the remote controller 11a is operated to revise the setting value of the volume 14, a remote control signal whose setting value is variable is radiated. The remote control signal is received by a photodetection section 12 of a VTR and given to a control section 13a. The control section 13a decodes the remote control signal, outputs a control signal in response to the decoded content to adjust the resistance of the volume 14. Thus, the sound volume is varied optionally without any sound volume adjustment of the television receiver.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an RF converter circuit for a video device (VTR, VCR) that outputs an RF (high frequency) signal to a television receiver, and more specifically relates to an RF converter circuit for a video device (VTR, VCR) that outputs an RF (high frequency) signal to a television receiver. This invention relates to an RF converter circuit that adjusts the level of an audio signal using a remote control before obtaining a frequency modulated signal, and can arbitrarily change the volume on a television receiver into which the RF multiplied signal is input.

[Conventional Example] Conventionally, an RF converter circuit as an output circuit of a video apparatus has a configuration shown in FIG. 2, for example.

In the figure, an audio signal reproduced from a videotape by a video device is audio amplified! Amplified by 1.

Using this audio signal as a modulation signal, the 4.5 MHz audio carrier wave oscillated by the oscillator 3 is subjected to FM (frequency modulation) in the FM modulator 2, while the similarly reproduced video signal is amplified in the video amplifier 4. A clamp section 5 sets the signal to a predetermined level, and a 4.5 MHz trap section 6 traps the audio frequency signal.

In this way, the audio FM signal and the video signal from which the audio frequency component has been removed at a predetermined level are mixed in the video/audio mixer 7, and the mixed (audio, video) signal is used as a modulation signal to be transmitted to the AM modulator. The carrier wave oscillator 9 oscillates at 8.
A channel or two channels of carrier waves are subjected to AM (amplitude modulation). This mixed (audio, video) AM signal is largely attenuated in areas other than the television broadcast band by a filter (BPF) 10. In this way, the RF multiplied signal obtained by the RF converter circuit is input to the television receiver via the VHF antenna, and a reproduced video image can be obtained on one or two channels of the television receiver.

The video device also includes a light receiving section 12 that receives a remote control signal from the remote control 11, and a control section that controls recording/playback, recording reservation, etc. in accordance with the remote control signal obtained by the light receiving section 12. CPU) 13 is provided.

Such remote control functions have come to be provided not only in video devices, but also in television receivers and other home appliances, making the handling of these video devices and television receivers more convenient.

Furthermore, a system remote controller for remotely controlling an AV system that combines various devices has been proposed, and is becoming more convenient.

[Problems to be Solved by the Invention] However, since the above-mentioned remote control function is provided independently in a video device and a television receiver, for example, when displaying images played back by a video device on a television receiver, However, there was the inconvenience of having to operate both the remote control for the television receiver and the remote control for the video device.

In addition, as mentioned above, when operating the remote control for a video device to adjust the volume of the video image to a higher or lower level when playing the video image on a television receiver, it is necessary to adjust the volume of the video image to a higher or lower level. There was a problem in that I had to use the remote control for the TV receiver instead of the remote control for the TV receiver.

Further, there is a problem in that the AV system controlled by the system remote controller must be composed of equipment from the same manufacturer, and must be of a limited number of models.

The present invention has been made in view of the above points, and its object is to provide an RF converter circuit for a video device that is capable of varying a predetermined level of the RF multiplied signal audio signal output to a television receiver. It is in.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a VTR device having a function of recording and playing back television broadcasts, etc., and a function of controlling the recording, playback, etc. by remote control.

The audio FM signal and the video signal are mixed, and this mixed signal is
In an RF converter circuit that outputs an F-fold signal to a television receiver or the like, a variable means for varying the level of the audio signal is provided before the FM modulator for obtaining the audio FM signal, and this variable means is controlled by the remote controller control function. The control means is operable to vary the level of the audio signal to a predetermined value in response to remote control operation.

[Function] With the above configuration, the level of the audio signal can be arbitrarily varied by controlling the variable means using the remote control of the video device. This audio signal at a predetermined level is converted into an audio FM signal by the FM modulator, and this audio FM signal is mixed with a video signal.

The mixed signal is then RF multiplied and input to a television receiver via a VHF antenna. Therefore, the volume of the speaker of the television receiver can be changed arbitrarily by operating the remote control of the video device in a predetermined manner.

[Example] Hereinafter, an embodiment of the present invention will be described based on FIG. 1.

In the figure, the same parts as in FIG. 2 are denoted by the same reference numerals, and redundant explanation will be omitted.

In the figure, the RF converter circuit is provided with a digital polynium 14 that is a variable means for varying the level of the reproduced audio signal amplified by the audio amplifier 1, and this digital polynium 14 is provided at the front stage of the FM modulator 2. . That is, before the FM modulator 2 uses the reproduced audio signal as a modulation signal to frequency-modulate the carrier wave of the 4.5 MHz oscillation frequency of the oscillator 3, the level of the audio signal is arbitrarily varied by the digital polynium 14. be done. On the other hand, the remote control 11a is equipped with a remote control signal output function for varying the set value of the digital polynium 14.

Further, the control section 13a is provided with a control function for varying the digital polynium 14 based on the remote control signal.

Next, the operation of the RF converter circuit having the above configuration will be explained.

First, it is assumed that a video tape is being played back in a video apparatus equipped with this RF converter circuit, and the audio and video signals recorded on the video tape are being played back.

Then, among the reproduced signals, the audio signal is transmitted to the audio amplifier 1.
The signal is amplified to a predetermined value by the digital polynium I4 and set to a level corresponding to its resistance value.

That is, the reproduced audio signal is digital polynium 1
The level can be changed by the attenuation rate corresponding to the resistance value of 4. This level-varied audio signal is used as a modulation signal,
As in the conventional case, a carrier wave of 4.5 MHz is frequency-modulated by an FM modulator 2, and this audio FM signal and a video signal via a trap circuit 6 are mixed by a video/audio mixer 7.

The AM modulator 8 uses this mixed signal as a modulation signal to amplitude-modulate one or two channels of carrier waves. In this way, the RF multiplied signal obtained by the RF converter circuit is input to the television receiver via the VHF antenna, and a reproduced video image can be obtained on one or two channels of the television receiver. Moreover, the volume of the speaker is set according to the set value of the digital polynium 14.

Here, when an operation is performed to change the setting value of the digital polynium 14 by operating the remote control lla, etc.,
A remote control signal of the changed setting value is emitted from the remote control lla. Then, the remote control signal is received by the light receiving section 12 of the video device and inputted to the control section 13a, and the control section 13a decodes the remote control signal and generates a control signal according to the decoded contents. Output. That is, since the resistance value of the digital polynium 14 is increased or decreased by the control signal, the level of the audio signal is adjusted in accordance with the operation of the remote control lla.

In the television receiver into which the RF multiplied signal output from the RF converter circuit is input, the level of the audio signal obtained by the audio signal processing section is varied on the video device side, so that the television receiver receives The volume from the machine's speakers is decreased or increased depending on the settings on the video device side. In this way, if you want to decrease or increase the volume of the speaker, use the remote control 1
By operating 1a in a predetermined manner, the set value of the digital polynium 14 of the video device is varied, so the volume can be changed arbitrarily without adjusting the volume on the television receiver side. Note that, as in the past, it is of course possible to adjust the volume of the speaker on the television receiver side as well.

[Effects of the Invention] As explained above, according to the RF converter circuit for a video device of the present invention, a digital polynium (variable means) for varying the level of an audio signal is provided in the front stage of the FM modulator, and this digital Since the value of polynium can be changed arbitrarily by remote control operation, etc., when playing back the video device, the volume adjustment of the speaker on the TV receiver side that inputs the RF multiplied signal from the RF converter circuit can be done on the video device side. It can be carried out in a prescribed manner. therefore.

If you want to adjust the volume while playing a video using the remote control, you can simply operate the video remote control without having to operate the TV remote control each time, which greatly improves usability. There is an effect.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of an RF converter circuit of a video device showing an embodiment of the present invention, and FIG. 2 is a schematic block diagram of an RF converter circuit of a conventional video device. In the figure, 2 is an FM modulator, 14 is a digital polynium (
variable means), 13.13a is a control section (control means: C
PU), 11° 11a is a remote control. Patent applicant Fujitsu General Ltd.

Claims (2)

[Claims] (1) Functions to record and play back TV broadcasts, etc., and their recording and
The audio FM signal is obtained in an RF converter circuit that mixes an audio FM signal and a video signal and outputs this mixed signal to a television receiver, etc. as an RF signal in a VTR device that has a function to remotely control playback, etc. A variable means for varying the level of the audio signal is provided before the FM modulator, and a control means for operating the variable means using the remote control control function, and the level of the audio signal is varied to a predetermined value in response to remote control operation. RF of a video device characterized by:
converter circuit. (2) The RF converter circuit for a video device according to claim (1), wherein the variable means is a digital polynium.