JPS6355272B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a main channel in audio multiplex broadcasting,
The present invention relates to a television receiving device in which switching between a sub channel and a main/sub channel can be carried out either selectively when manually operated, or sequentially when operated by a remote control.

Today, audio multiplex broadcasting is being carried out, which transmits two audio lines within the frequency band allocated to each channel with a width of 6 MHz, and allows bilingual broadcasting and stereo broadcasting using a main channel and a secondary channel. For this reason, television receivers are provided with circuits and manual switches that allow the users to switch and listen to these sounds on a channel-by-channel basis. Such switches include one or more mode selection switches for selecting a main channel, a subchannel, and a main/subchannel. On the other hand, if you try to switch channels by remote control, you will need a separate control circuit that responds to the remote control operation. The channel designation display of the switch may be different. In such a case, it becomes unnatural in terms of operation and appearance, and there are problems in terms of cost and ease of use.

The present invention has been made in view of such problems, and in particular, an electronic switching circuit is associated with a channel selection circuit for selecting a main channel, a subchannel, and a main/subchannel, and the electronic switching circuit is controlled by a remote control signal. The present invention provides a television receiving device which is driven to sequentially switch each of the channels.

An embodiment of the television receiving apparatus according to the present invention will be described below with reference to the drawings.

FIG. 1 is a specific circuit diagram thereof. 1 is a switch for selecting a sub channel, 2 is a switch for selecting a main/sub channel, and 3 is a switch for selecting a main channel. 4 to 8 are each of the above switches 1 to 3
The backflow prevention diodes 9 to 16 connected to are voltage dividing resistors for setting the set input voltage and reset input voltage of the next JK flip-flop, respectively. 17, 18 and 19, 20 are input terminals J ₁ of the J-K flip-flop, which will be described later.
K ₁ , J ₂ , K ₂ and clock pulse input terminal C ₁ ,
C is the resistor connected to ₂ . Reference numerals 21 and 22 are two J-K flip-flops integrated into an IC, and the output terminal Q1 of the flip-flop 21 is connected to AND circuit ₂ of the four AND circuits 23 to 26 integrated into an IC.
Similarly, the output terminal Q ₁ is connected to one input terminal of the AND circuit 24 . Similarly, output terminals Q ₂ and ₂ of JK flip-flop 22 are connected to respective input terminals of AND circuits 25 and 26 via resistors 27 and 28, respectively. 29 is a transistor that is turned on by a signal obtained by rectifying the 922.5Hz signal obtained during bilingual broadcasting, and its collector is connected to the power supply.
The emitter is connected to the other input terminals of each of the AND circuits 23 to 26 and to the anode sides of the light emitting diodes 30 and 31. 32 and 33 are transistors whose collectors are connected to their cathodes, and whose emitters are grounded via resistors 34 and 35. Furthermore, these transistors 32,3
The output terminal ₁ of the flip-flop 21 and the resistor 27 are connected to the base of the flip-flop 21 via resistors 36 and 37, respectively. 38 is a transistor that generates a kick voltage when the power switch is turned on;
The emitter passes through diodes 39 and 40,
the above-mentioned resistor 15 and flip-flop 2, respectively.
1 reset input terminal _R1 . 4
1 and 42 are capacitors and resistors for forming a kick voltage. 43 to 45 are diodes, and 46 is a capacitor. 47 is a remote control pulse input terminal, which is the clock input terminal of flip-flop 21.
C ₁ and is connected to a resistor 48 and a capacitor 49 forming a delay circuit. 50, 51 and 52 are diodes and resistors constituting an AND circuit, which act to supply a clock signal to the clock input terminal _C2 of the flip-flop 22 when the signals applied to their inputs are at high level H. Reference numerals 53 to 56 denote analog switches consisting of CMOS ICs, which are closed by the outputs of the AND circuits 23 to 26, and pass the main channel signal and sub channel signal applied to input terminals 57 and 58 to the right channel amplifier and the left channel amplifier, respectively. It is now possible to selectively supply the channel amplifier.

Next, the operation of the above circuit will be described.

(1) During manual switching operation First, turn on the power switch of this television receiver. As a result, a kick pulse is generated at the output of the transistor 38, and the diode 4
0,39 through flip-flops 21,22
The signals applied to the reset input terminals R ₁ and R ₂ of the
The signals obtained at Q ₁ and Q ₂ are low level (hereinafter referred to as L
). Therefore, the signals at the respective output terminals ₁ and ₂ become H. If bilingual broadcasting is being performed here, the transistor 2
Since 9 is on, the above AND circuit 2
The outputs of switches 4 and 26 become H, and analog switches 54 and 56 are closed. Therefore, the main channel signal applied from the main channel signal input terminal 57 is applied to the respective right and left channel amplifiers, and the main channel audio can be heard from the left and right speakers of the television receiver. can. That is, when the power is turned on, the main channel mode is automatically established.
At this time, by turning on the transistor 32, a current flows through the light emitting diode 30, which lights up to indicate that the main channel mode is present. When the switch 1 is closed in order to listen to the audio on the sub-channel, the power supply voltage is applied to the set input terminals S ₁ and S ₂ of the flip-flops 21 and 22 via the resistor 9, diode 4, and resistor 11, and this becomes H. As a result, the output terminal
Q ₁ and Q ₂ become H, and output terminals ₁ and ₂ become L.
Therefore, the outputs of the AND circuits 24 and 26 are L.
On the other hand, the outputs of the AND circuits 23 and 25 become H.
Therefore, the analog switches 53 and 55 are closed, and the sub-channel signals are output to the left and right channel amplifiers. At this time, since the base potential of the transistor 33 is H, it is turned on and the light emitting diode 31 for sub-channel display is lit.

In addition, switch 2 for selecting the main/sub channel
When the flip-flop 21 is closed, the flip-flop 21
The reset input terminal R ₁ of the flip-flop 22 becomes H, the set input terminal S ₂ of the flip-flop 22 becomes H, and both output terminal ₁ and output terminal Q ₂ become H, so that the outputs of the AND circuits 24 and 25 become H.
Therefore, the analog switches 54 and 55 are closed, the main channel signal and the sub-channel signal are taken out to the left and right amplifiers, and sounds from different sound sources can be heard from the left and right speakers. In this case, the transistor 3
Since channels 2 and 33 are driven together, main channel and sub channel display are performed simultaneously.

(2) During remote control switching operation First, when the power switch is turned on, the circuit is in the main channel mode as described above. Here, when a remote control signal is sent to the input terminal 47 by remote control operation, the clock input terminal _C1 of the flip-flop 21 becomes H.
Therefore, the output terminal _Q1 is inverted and becomes H.
On the other hand, the clock input terminal of flip-flop 22
_C2 becomes H by an AND circuit of a diode 50 and a resistor 52, and the output terminal ₂ is inverted and becomes H. Therefore, as described above, the outputs of the AND circuits 23 and 25 become H, the analog switches 53 and 55 are closed, and the sub-channel mode is entered. In addition, the above-mentioned resistor 48 and capacitor 4
9 is the input terminal for the order in which clock pulses are added.
By giving priority to C ₁ over C ₂ , the output of the output terminal Q ₁ can be set to H immediately, and the input terminal C ₂ can be stably set to H.

Next, when the remote control signal comes again, a remote control pulse is applied to the input terminal 47, and at this time, the clock input terminal _C1 of the flip-flop 21 becomes H, and the signal is inverted at the output terminal _Q1 and becomes L.
becomes. On the other hand, a pulse delayed by the time constant of the resistor 48 and capacitor 49 is about to enter the clock input terminal _C2 , as described above. However, at this time, the output terminal Q ₁ is inverted to L, so the clock input terminal is connected via the diode 51.
C ₂ is pulled to L, and only the output terminal Q ₂ is not inverted. Therefore, analog switches 54 and 55 are closed in the same way as described above, and the main channel signal and sub-channel signal are taken out to the left and right amplifiers connected to each, thereby forming a main/sub channel mode.

Furthermore, when the next remote control signal comes, the output terminal _Q1 is inverted by the clock input terminal _C1 and becomes H, and the clock input terminal _C2 becomes H by the AND circuit of diodes 50, 51 and resistor 52. Output terminal _Q2 is inverted and becomes L. At this time, output terminal Q ₁ is H, output terminal Q ₂ is H
It is detected that the diodes 43 and 45
The AND circuit sets the reset terminal _R1 to H. This causes the output terminal _Q1 to become L, but
Feedback will immediately be made to the main channel mode. In this way, channels can be switched sequentially by remote control operation.

As described above, in the television receiver according to the present invention, when receiving an audio multiplexed signal, the main channel, sub channel, or main/sub channel can be switched by manual operation of the switch provided on the main body of the television receiver. Any one of them can be selected arbitrarily, and each of the channels can be sequentially selected according to a predetermined sending order using a remote control signal.

Therefore, when selecting each of the channels using the switch, so-called random selection can be performed, thereby ensuring good operability. Furthermore, since the remote control signal may be of only one type, the remote control signal transmitting device can be made simple and compact.

Further, since the switch and the transmitting device are provided separately, it is natural that the selection operation by the switch and the so-called remote control by the transmitting device can be performed simultaneously.

That is, the present invention provides a television receiving device that provides good operability without complicating the device configuration.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of a television receiver according to the present invention. 1...Switch for subchannel selection, 2...
Switch for main/sub channel, 3... Switch for main channel, 21, 22... Electronic switch circuit, 47... Input terminal for remote control pulse.

Claims (1)

[Scope of Claims] 1. In a television receiver that receives an audio multiplexed signal, the main body of the television receiver is provided with a main channel, a sub-channel, or a main/sub-channel for selecting the audio signal by manual operation. two flip-flops that are controlled by the switch and hold one of the three selection states; A four-circuit analog switch for distributing to the audio channel, and a changing means that is triggered each time a remote control signal is input and sequentially changes the state of the flip-flop between the three states according to a predetermined sending order. A television receiving device characterized by: