JPH11127114A - Television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a television receiver by which each person views a program in a favorite acoustics or volume or in a favorite language, even in the case that plural viewers view a television program. SOLUTION: A television tuner of a television receiver main body A selects a television signal from an RF signal, an audio signal is separated from the selected television signal and reproduced into an audio intermediate frequency signal with a frequency of 4.5 MHz. An infrared ray emission section 2 modulates an infrared ray signal with the selected audio intermediate frequency signal with a frequency 4.5 MHz and emits the modulated signal. An infrared ray receiver 3 receives the emitted infrared ray in an infrared-ray receiving audio demodulation system headphone B, and an audio detection amplifier section 4 detects and demodulates an audio signal from the received infrared ray.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver which emits an audio signal with infrared rays.

[0002]

2. Description of the Related Art When watching a television broadcast,
There is an individual difference in the sound quality and volume preference of each viewer, and in particular, a hearing-impaired person needs to have a higher treble or a higher volume than a healthy person. Therefore, when a plurality of viewers watch a television broadcast, each viewer can view the desired sound quality and volume, or, in the case of viewing a dual sound multiplex broadcast, in a preferred language. Is preferred. Therefore, as a system to solve this problem, a transmitter that radiates infrared rays is connected to the earphone terminal of the television receiver, and the audio signal demodulated by the television receiver is radiated from this transmitter with infrared rays. There is a system for receiving and demodulating the infrared rays obtained by a cordless headphone having an infrared demodulation function.

[0003]

However, the above-mentioned system does not provide the setting of the sound quality and volume on the television receiver side,
Also, when receiving a double audio multiplex broadcast, it depends on a switching mode (hereinafter referred to as “audio demodulation mode”) of Japanese, English, etc. set on the television receiver side.
There was a problem that the viewer could not view in the preferred sound quality and volume, or in the preferred language.

[0004] Therefore, the present invention provides a television receiver in which even when a plurality of viewers watch television, each of the viewers can view the desired sound quality and volume, or the preferred language. The task is to

[0005]

According to a first aspect of the present invention, there is provided a television receiver comprising an RF receiver.
A tuner section for inputting a signal and selecting a television signal, a processing section for separating a signal including an audio signal from the selected television signal, and reproducing the signal as an audio intermediate frequency signal, And a transmitter for modulating and radiating infrared rays with a voice intermediate frequency signal.

A television receiver according to a second aspect of the present invention includes a tuner section for inputting an RF signal and selecting a television signal, and an audio signal from the selected television signal. A television audio signal transmitting device comprising a processing unit that separates a signal and reproduces this signal into an audio intermediate frequency signal, and a transmitting unit that modulates and radiates infrared rays with the audio intermediate frequency signal, A television audio signal receiving / reproducing device includes a light receiving unit that receives the emitted infrared light and a demodulation unit that demodulates an audio signal from the received infrared light.

Therefore, according to the television receiver of the first aspect, a signal including an audio signal in the television signal selected by the tuner section is reproduced by the processing section into an audio intermediate frequency signal, and the transmission section is provided. Modulates and radiates infrared rays with this audio intermediate frequency signal.

[0008] According to the television receiver of the second aspect, the television audio signal transmitting apparatus converts the signal including the audio signal in the television signal selected by the tuner section into an audio intermediate signal by the processing section. Play back to frequency signal,
The transmitting section modulates and radiates infrared rays with the audio intermediate frequency signal. Then, the television audio signal receiving / reproducing device receives the emitted infrared light by the light receiving section, and demodulates the infrared light received by the demodulation section into an audio signal.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. The television receiver of the present embodiment includes:
It is composed of a television receiver main body A as a television audio signal transmitting device and an infrared light receiving audio demodulating headphone B as a television audio signal receiving and reproducing device. In this embodiment, an infrared light receiving sound demodulation type headphone B which receives infrared light by radiating the infrared light with a 4.5 MHz sound intermediate frequency signal before demodulating the sound signal from the television receiver main body A, and receiving the infrared light. On the side,
The audio intermediate frequency signal is detected and the audio signal is demodulated.

FIG. 1 is a block diagram showing a television receiver main unit A and an infrared receiving sound demodulating headphone B. As shown in FIG. 1, a television receiver main body A is roughly composed of a television tuner section 1 and an infrared light emitting section 2. The television tuner section 1 includes a high frequency amplification / frequency conversion section 11, an intermediate frequency amplification / It comprises a detection unit 12, an impedance matching unit 13, and a sound IF processing circuit 14. Note that reference numeral 5 in the figure denotes an outdoor antenna.

The high-frequency amplifier / frequency converter 11 selects and amplifies a television signal to be received from the RF signal received by the outdoor antenna 5, and converts this to a 54.25M audio signal.
Hz intermediate frequency signal.

The intermediate frequency amplifying / detecting section 12 is provided with the above-mentioned 54.
The audio intermediate frequency signal of 25 MHz is converted into an audio intermediate frequency signal of 4.5 MHz, and the audio intermediate frequency signal of 4.5 MHz is output to the sound IF processing circuit 14, and the infrared light emitting section 2 is output via the impedance matching section 13.
Output to When audio is output from the television audio transmitter A, the sound IF processing circuit 14 detects and amplifies the audio signal from the input 4.5 MHz audio intermediate frequency signal, and supplies it to a speaker or the like to output the audio. Output.

As for the video signal, the synthesized video signal is Y / C-separated by a video signal processing circuit (not shown), subjected to luminance signal processing and chrominance signal processing, and then subjected to R, G via a matrix circuit or the like. , B signal, and an image is output by a CRT or the like of the television receiver A.

The infrared light emitting section 2 outputs the output 4.5.
Infrared light is subjected to luminance modulation with an audio intermediate frequency signal of MHz and output to the outside.

The TV tuner 1 is a UH
Because it performs high-frequency signal processing such as F and VHF, it is arranged near the antenna terminal on the back of the television receiver main unit A. On the other hand, in order to transmit infrared rays to a viewer efficiently, it is desirable to mount an infrared light emitter including the infrared transmitter 2 on the front panel of the television receiver A. Therefore, the intermediate frequency amplifying / detecting unit 12 and the infrared light emitting unit 2 connected via the impedance matching unit 13 are connected by a low impedance shield cable 5 or the like in order to prevent mutual interference with other signals.

FIG. 2 shows the intermediate frequency amplifier / detector 12
A bandpass filter 12a, which is a part of the filter, an FET 13a, which is an impedance matching unit 13, and an infrared light emitting unit 2
The detailed circuit diagram of FIG. As shown in FIG. 2, the input 54.25 MHz audio intermediate frequency signal is converted into a 4.5 MHz audio intermediate frequency signal by the band-pass filter 12a. Then, this signal is output from the bandpass filter 12a to the FET1 having a lower output impedance.
3a and the infrared light emitting unit 2 via the shielded cable 5
Lead to. Note that the impedance conversion unit 12 of the present embodiment is
Is configured using the FET 12a, but may be an emitter follower using a transistor.

As shown in FIG. 2, the infrared light emitting section 2 generally includes transistors 21a and 21b and a light emitting diode 22.
a, 22b and the like.
The luminance modulation is applied to the infrared rays by driving with the input 4.5 MHz audio intermediate frequency signal by a and 21b, and the infrared rays are emitted from the light emitting diodes 22a and 22b.

The infrared receiving sound demodulating headphone B
Is, as shown in FIG.
It is roughly composed of an amplifier 4, an audio demodulation mode changeover switch (not shown), a volume controller, a sound quality controller, and the like.

The infrared light receiving section 3 receives the infrared light output from the infrared light emitting section 2 of the television receiver main body A, converts the infrared light into an electric signal, and outputs the electric signal to the audio detection / amplification section 4. The audio detection / amplification unit 4 demodulates the audio signal from the input audio intermediate frequency signal, amplifies it as an original LR audio signal, supplies the audio signal to a headphone speaker, and outputs it as stereo audio.

The operation of the above configuration will be described below. The RF signal received by the outdoor antenna 5 is selected and amplified by a high-frequency amplifier / frequency converter 11 to be converted into a 54.25 MHz audio intermediate frequency signal. Is entered. The intermediate frequency amplification / detection unit 12 converts the input 54.25 MHz audio intermediate frequency signal into a 4.5 MHz audio intermediate frequency signal, and outputs it to the infrared light emitting unit 2 via the impedance matching unit 13. The infrared light emitting unit 2 outputs the above-mentioned 4.
Infrared light is modulated by a 5 MHz audio intermediate wave number signal and output to the outside as an infrared signal. The emitted infrared light is received by the infrared light receiving unit 3 of the infrared light receiving and sound demodulating headphone B, converted into an electric signal, and input to the sound detecting / amplifying unit 4. The audio detection / amplification unit 4 demodulates the audio signal from the input signal, amplifies the signal as an original LR audio signal, supplies the amplified signal to a headphone speaker, and outputs it as stereo audio. Then, the TV sound is demodulated in the desired sound quality volume and sound demodulation mode based on the operation information supplied from the sound quality adjustment switch, the volume adjustment switch, and the sound demodulation mode switch.

Since the conventional system transmits the right and left audio signals with different carrier waves, the receiving side must be able to receive these different carrier waves and a wideband demodulation circuit must be provided. However, in the present invention, it is only necessary to be able to demodulate only the above-mentioned audio intermediate frequency signal, so that a wideband demodulation circuit is unnecessary on the light receiving side.

[0022]

As described above, the television receiver according to the first aspect of the present invention modulates and radiates an infrared ray with an audio intermediate frequency signal. It does not depend on the sound quality, volume or sound demodulation mode set on the side.

According to a second aspect of the present invention, in the television receiver, the television audio signal transmitting apparatus modulates and radiates infrared rays with the audio intermediate frequency signal and receives the infrared rays. Since the audio intermediate frequency is demodulated on the playback device side, the television audio receiving / reproducing device side does not depend on the sound quality and volume or the audio demodulation mode on the television audio transmission side, and the audio signal is in the desired sound quality and volume or the preferred language. This has the effect of being able to play back.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a partial circuit configuration diagram of the embodiment of the present invention.

[Explanation of symbols]

A: Television receiver body, B: Infrared light receiving sound demodulation type headphones, 1 ... TV tuner part, 2 ... Infrared light emitting part, 3 ... Infrared light receiving part, 4 ... Sound detection / amplification part

Claims (4)

[Claims] 1. A tuner section for inputting an RF signal to select a television signal, separating a signal including an audio signal from the selected television signal, and reproducing the signal as an audio intermediate frequency signal And a transmitting unit that modulates and radiates infrared rays with the audio intermediate frequency signal. 2. A tuner section for inputting an RF signal to select a television signal, separating a signal including an audio signal from the selected television signal, and reproducing the signal as an audio intermediate frequency signal. A television audio signal transmitting apparatus comprising: a processing unit that modulates and radiates infrared light with the audio intermediate frequency signal; and a light receiving unit that receives the radiated infrared light. A television receiver, comprising: a demodulation unit that demodulates an audio signal from infrared light; and a television audio signal reception / reproduction device. 3. The frequency of the audio intermediate frequency signal is
The television receiver according to claim 1, wherein the frequency is 4.5 MHz. 4. The frequency of the audio intermediate frequency signal is
The television receiver according to claim 2, wherein the frequency is 4.5 MHz.