JPS61184916A - Receiver - Google Patents

Abstract

PURPOSE:To solve complicated trouble in receiving a cable television broadcast (MTV) by providing a circuit comparing a sound output of a TV broad case and a monaural sound output of an FM broadcast and a logical circuit driven by the compared output. CONSTITUTION:The MTV for exclusive use of music program is led to a TV tuner 19 and its sound output signal 20 is brought into a constant level by a limiter circuit 14. On the other hand, the FM radio wave is led to an FM turned 5 and stereo sound outputs 6a, 6b are subject to monaural output by a limiter circuit 10 and the level is matched to the monaural sound signal obtained by the circuit 14. Then the output of the comparator 11 is zero. When the input signal is zero, the output signal of the logical circuit 12 is set to a high level. In turning on a simultaneous cast switch 13, selector switches 8a, 8b connect to terminals 2a, 2b for other acoustic device, for example, in the selector switches 7a, 7b, 8a, 8b and even when the switches 8a, 8b are turned on, the switches 7a, 7b being the reception mode of the FM broadcast are turned on forcibly.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a receiver for TV broadcasting, FM broadcasting, etc.

BACKGROUND OF THE INVENTION Generally, in cable television broadcasting practiced in the United States and other countries, the video and monaural audio output of a music program are sent via TV radio waves, and the stereo audio signal is sent via FM radio waves. Subscribers have access to the TV screen and TV reception.
By selecting the FM receiver based on the sound from the built-in speaker, the video information of the music program is received on the television, and the stereo audio signal is received by the FM receiver.

Problems to be Solved by the Invention As described above, conventional receivers do not support music program-only cable television (hereinafter referred to as M
(referred to as TV), a TV receiver, FM
There is a complication of having to select channels separately on each receiver.

An object of the present invention is to provide a receiver that can solve the complexity of receiving MTV.

Means for Solving the Problems The receiver of the present invention is provided with a comparison circuit for comparing the audio output of TV broadcasting and the monaural audio output of FM broadcasting, and a logic circuit driven by the output of this comparison circuit. The present invention is characterized in that the automatic tuning of the FM broadcast is controlled by the output of the circuit.

Function: With this configuration, the automatic tuning of FM broadcasting is controlled by the output of the comparison circuit that compares the audio output of TV broadcasting and the audio output of FM broadcasting, so when the comparison circuit detects that both audio signals match, the FM tuner is By terminating the sweep, the complexity of channel selection when receiving MTV can be solved.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings. A cable television dedicated to music programs is led to a TV tuner 19 from a TV antenna terminal 3. The audio output signal @20 is made to a constant level via a limiter circuit 14 having an amplification function. On the other hand, in MTV, a stereo signal of the audio signal is transmitted via FM radio waves. F
The M radio wave is guided from the FM antenna terminal 1 to the FM tuner 5, and its stereo audio outputs 6a and 6b are converted into monaural signals by a limiter circuit 10 with an amplification function, and the level is also the same as that of the TV broadcast obtained by the limiter circuit 14. monaural audio signal. The audio outputs of the limiter circuits 10 and 14 are compared by a comparator 11. In the case of MTV, these two signals are the same signal and their levels are also equal in each limiter circuit 10, 14, so the output of the comparator 11 is zero. Comparator 11 is logic circuit 12
It is connected to the. The logic circuit 12 is set so that when the input signal is zero, the output signal is at a high level in DC terms. The output of the logic circuit 12 is led to the tuning circuit 15 of the FM tuner 5 via the simulcast switch 13. When the simulcast switch 13 is turned on, the selector switches 7a, 7b, 8a, 8tl;t, for example, the amplifier 4 is connected to the terminals 2a, 2b for other audio equipment.
Even if the selector switches 3a and 8b are turned on, the selector switches 7a and 7b, which are in the FM broadcast reception mode, are always forced to be turned on. ing. Moreover, the switch 13 also operates in conjunction with a sweep start switch 17 that starts automatic tuning of the tuning circuit 15. Further, when a signal having a certain level of electric field strength is input to the FM tuner 5, a signal to stop the sweep is applied to the tuning circuit 15 through the line 1G, and the tuning circuit 15 stops the sweep.

However, if the logic is configured so that when the switch 13 is on, the sweep will not be stopped unless a high DC level of the logic circuit 12 is simultaneously applied to the tuning circuit 15, then the tuning circuit will sweep at a certain level. Field strength and MTV
It only stops at the stations of the following broadcasting stations. 9a and 9b are audio amplifiers, and 18a and 1.8b are speaker terminals. Note that in the drawings, the description of the video is omitted because it is the same as the conventional one.

In this way, cable television broadcasting can be started by simply turning on the switch 13, which does not require the complicated operation of switching the selector switch from another playback mode position to the FM broadcast playback mode, and moreover, it is possible to watch cable TV broadcasts by simply turning on the switch 13. You can receive MTV stereo audio signals without any operations.

In the above embodiment, the case where MTV video and stereo audio are received has been described, but the same applies to the case where only stereo audio is received and no video is received.

As described in the detailed description of the invention, the receiver of the present invention includes a comparison circuit that compares the audio output of TV broadcasting and the noural audio output of FM broadcasting;
A logic circuit driven by the output of this comparison circuit is provided, and the automatic tuning of the FM broadcast is controlled by the output of the logic circuit, so that by simply selecting the TV tuner, you can tune the cable television dedicated to music programs. It can receive stereo audio signals and solves the complexity of conventional channel selection.

[Brief explanation of drawings]

The drawing is a block diagram of one embodiment of the present invention. 1... FM antenna terminal, 3... TV antenna terminal, 5... FM tuner, 6a, 6b... FM audio output, 10... Limiter circuit, 11... Comparator,
12... Logic circuit, 13... Simulcast switch, 14... Limiter circuit, 15... Tuning circuit,
17...Sweep start switch, 18a.

Claims (1)

[Claims] 1. A comparison circuit that compares the audio output of TV broadcasting and monaural audio output of FM broadcasting, and a logic circuit driven by the output of this comparison circuit are provided, and the automatic tuning of the FM broadcasting is controlled by the output of the logic circuit. A receiver configured to: