JPH0526837Y2 - - Google Patents

Description

[Detailed explanation of the idea] (b) Industrial application fields The present invention relates to a receiving device.

(b) Conventional technology In recent years, so-called AV (audio-visual) products that integrate audio equipment and video equipment have been proposed. Such AV products can satisfy the functions that were previously lacking and can give a sense of luxury. As part of such AV commercialization, the sound of a broadcast station being received by a TV receiver is received by a receiving device and reproduced in high frequency.

(c) Problems to be solved by the invention In the above-mentioned conventional technology, it is necessary to perform channel selection operations on both the TV receiver and the receiving device, making the operation extremely complicated.

(d) Means for solving the problems In view of the above problems, the present invention has been proposed to at least
a receiving circuit unit capable of receiving audio signals of the band;
A signal terminal to which an audio output signal from the TV receiver is supplied, and comparing and determining the audio signal input from this signal terminal and the audio signal from the receiving circuit section,
When a match occurs, the first output signal is output, and when a mismatch occurs, the second output signal is output.
a comparison circuit that outputs an output signal; a controller that controls a broadcast frequency received by the reception circuit based on a second output signal; and a controller that controls a broadcast frequency received by the reception circuit based on a second output signal; A selection circuit is provided which selectively supplies the signal and the audio signal from the signal terminal to the subsequent circuit. The comparison circuit compares and determines the received audio signal with the second output signal from the comparison circuit, and if the two signals do not match, the controller changes the reception broadcast frequency based on the second output signal from the comparison circuit. At this time, the audio signal input from the signal terminal is supplied to the subsequent circuit.

On the other hand, if the two signals match, the audio output signal from the receiving circuit is supplied to the subsequent circuit based on the first output signal from the comparison circuit.

(f) Example The figure shows an example of the present invention. In the figure, 1 is an antenna, 2 is a receiving circuit section consisting of a well-known high-frequency amplification circuit, a mixing circuit, a local oscillation circuit consisting of a PLL, an intermediate frequency amplification circuit, and a detection circuit, and 3 is a programmable frequency divider section constituting the PLL. 4 is a key input unit connected to the controller 3; 5 is a signal terminal to which an audio output signal from the TV receiver 6 is supplied; 7 is a signal to the signal terminal 5; track 8
9 is set to an operating state based on the detection signal _S1 from the detection unit ₇ , and when in operation, the receiving circuit A comparison circuit that compares and determines the audio output signal from the section 2 and the audio signal from the signal terminal 5, and when the two signals match, the first output signal S _{2 is} output.
When they do not match, a second output signal _S3 is output. 1
0 is a selection circuit 11 that selects the audio output signal from the receiving circuit section 2 and the audio signal input from the signal terminal 5 based on the first output signal _S2 from the comparison circuit 9;
1 is a low frequency amplifier circuit, and 12 is a speaker.

Next, the operation will be explained.

When the signal line 8 from the TV receiver 6 is connected to the signal terminal 5, the detection unit 7 outputs a detection signal _S1 based on the mechanical connection between the signal line 8 and the signal terminal 5 or the presence or absence of an input audio signal. do.

Based on the detection signal _S1 , the comparison circuit 9 is set to an operating state and compares and determines the audio output signal from the receiving circuit section 2 and the audio signal from the signal terminal 5. still,
In this comparison and determination, both audio signals are once converted into digital signals and the digital signals are compared, but other methods may be used.

As a result of this determination, if the two signals do not match, the comparison circuit 9 outputs the second output signal S ₃ and supplies it to the controller 3. The controller 3 is set to the sweep state based on the second output signal _S3 , and variably controls the frequency division ratio of the programmable frequency divider of the receiving circuit section 2.

When the receiving circuit section 2 is tuned to another broadcast frequency by such a sweep, the receiving circuit section 2 outputs a tuning detection signal _S4 , and the controller 3 stops the sweep in response to this.

The tuning detection signal S ₄ is also supplied to the comparison circuit 9, and the comparison circuit 9 compares and determines both audio signals again in response to the rise (or fall) of the tuning detection signal S ₄ .

As a result, if both audio signals match, the comparison circuit 9 outputs the first output signal _S2 , and the selection circuit 10
Set the switch to the side.

Therefore, the audio output signal from the receiving circuit section 2 is
The signal is supplied to a low frequency amplifier 11 via a selection circuit 10, amplified by the low frequency amplifier 11, and then emitted from a speaker 12.

Note that until the comparing circuit 9 determines that the two audio signals match, the audio signal from the TV receiver 6 inputted from the signal terminal 5 is emitted from the speaker 12.

(g) Effects of the invention According to the invention, there is provided a receiving circuit section capable of receiving at least an audio signal in the TV band, a signal terminal to which an audio output signal from a TV receiver is supplied, and a signal input from the signal terminal. a comparison circuit that compares and determines the audio signal from the received audio signal and the audio signal from the receiving circuit section, and outputs a first output signal when they match and outputs a second output signal when they do not match; and the receiving circuit based on the second output signal. a controller for controlling the broadcast frequency received at the section; and a controller that selectively sends the audio signal from the receiving circuit section and the audio signal from the signal terminal to a subsequent circuit according to each output signal from the comparison circuit. Since a selection circuit is provided, the receiving frequency of the receiving circuit section can be automatically matched with the broadcasting frequency being received by the TV receiver, improving operability.

[Brief explanation of drawings]

The figure shows an embodiment of the present invention. 2... Receiving circuit section, 3... Controller, 5...
...signal terminal, 9...comparison circuit, 10...selection circuit.

Claims (1)

[Scope of utility model registration request] A receiving circuit unit capable of receiving at least an audio signal of the TV band, a signal terminal to which an audio output signal from the TV receiver is supplied, and an audio signal input from this signal terminal and an audio signal from the receiving circuit unit. a comparator circuit that compares and determines and outputs a first output signal when they match and outputs a second output signal when they do not match;
a controller that controls a broadcast frequency received by the receiving circuit based on a second output signal; and an audio signal from the receiving circuit and an audio signal from the signal terminal according to each output signal from the comparing circuit. 1. A receiving device comprising: a selection circuit that selectively supplies the following signals to a downstream circuit.