JPS635952B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a remote control device such as a television receiver.

Traditionally, remote control devices for television receivers are
The receiver selects a channel in response to a channel selection control signal from the commander, and the channel is displayed on the receiver.

However, depending on the direction of the commander, it may not work, or a different channel may be selected due to interference, etc. In such cases, the channel display on the receiver may be small or distorted. If you make a mistake, you may end up continuing to watch the wrong channel without knowing it. In order to prevent this, methods such as increasing the size of the channel display on the receiver or displaying the channel on a picture tube have been considered, but these methods have the disadvantage that the display becomes distracting.

In view of these points, the present invention is designed to make it possible to reliably check from the commander at hand whether or not the receiver has selected a channel in accordance with the tuning operation performed by the commander.

Hereinafter, an example of this invention will be explained with reference to the drawings.

FIG. 1 shows an example of the remote control device of the present invention.
100 on the left side indicates a commander, and 200 on the right side indicates a television receiver, respectively.

In the commander 100, reference numeral 11 denotes a tuning switch group, which has n tuning switches corresponding to each channel. 12 is an ultrasonic generation circuit; ₁₃ is an oscillation frequency of the ultrasonic generation circuit 12 according to the operated tuning switch of the tuning switch group 11;
₂ , . . . _o , and 14 is a speaker. Further, 15 is a channel memory that converts the frequency switching signal from the frequency switching circuit 13 into a binary code and stores it.

On the other hand, 17 is a microphone that receives the signal from the receiver 200, 18 is an amplifier, and 19 is a discrimination circuit, which includes bandpass filters A ₁ , A ₂ for extracting signals with frequencies of ₁ , ₂ , ... _o . ，……A _o
and the detectors B ₁ , B ₂ , ... connected to them respectively.
B _o and a code generating circuit 20 that generates a channel code depending on which one the detected output is from using predetermined detected outputs from the detectors B ₁ , B ₂ , . . . B _o .

Further, 21 is a code generation circuit 2 of the discrimination circuit 19.
a comparison circuit for detecting whether the code from 0 matches the code from the channel memory 15; 2;
2 is a display circuit that displays whether or not there is a match.

Note that 23 is a monostable multivibrator that is triggered by operating any one of the tuning switches in the tuning switch group 11, 24 is a power switch for the ultrasonic generation circuit 12, and 25 is a power switch for the amplifier 18.

In the receiver 200, 31 is the commander 100
32 is an amplifier, 33 is a discrimination circuit, which receives signals from the microphone when the frequency is ₁ , ₂ ,
It has bandpass filters C ₁ , C ₂ , . . . C _o for extracting the signals of . . . _o , and detectors D ₁ , D _{2 ,} .

34 is a detector D ₁ , D ₂ , . . . of the discrimination circuit 33;
A channel memory generates and stores a channel code according to the predetermined detection output from D _o , and 35 takes out the detection outputs of the detectors D ₁ to D _o of the discrimination circuit 33 all at once. 36 is a reset circuit for the channel memory 34, 37 is a tuning circuit for selecting a terminal voltage of a variable capacitance diode of an electronic tuning tuner to select a station, and 38 is a channel display circuit.

On the other hand, 39 is an ultrasonic generation circuit, and 40 is an oscillation frequency of the ultrasonic generation circuit 39 according to the channel code from the channel memory 34, ₁ , ₂ , . . .
Frequency switching circuit for switching to one of _o , 41
is a speaker.

In addition, 42 is a monostable multivibrator, 43
44 is a power switch for the ultrasonic generating circuit 39, and 44 is a power switch for the amplifier 32.

When the commander 100 operates a corresponding channel selection switch in the channel selection switch group 11 to select an arbitrary channel, for example, the channel corresponding to the frequency ₁ mentioned above, the monostable multivibrator 23
One output S _A (Fig. 3 A) becomes "1" in a certain period T _A , and in this period T _A , the power switch 24
is turned on, the frequency switching signal from the frequency switching circuit 13 causes the ultrasonic wave generation circuit 12 to obtain an ultrasonic signal P ₁ (B in the same figure) for controlling the frequency of ₁ , which is emitted from the speaker 14. .

At this time, the channel memory 15 stores a code corresponding to the channel, that is, a code corresponding to frequency ₁ . Note that the memory 15 is rewritten when the next information arrives.

The control ultrasonic signal P ₁ of frequency ₁ transmitted from the commander 100 is sent to the receiver 200.
is received by the microphone 31 at the amplifier 32.
The signal is supplied to the discrimination circuit 33 through the bandpass filter C1, and is extracted from the bandpass filter _C1 , and a predetermined detection output is obtained from the detector _D1 .

Here, bandpass filter C ₁ and detector D ₁
The portion shown in FIG. 2 is configured as shown in FIG. 2, for example. That is, 61 to 64 are transistors, a bandpass filter _C1 is connected to the collector side of the transistor 61, a rectifying resistor 65 and a capacitor 66 are connected to the collector side of the transistor 62, and a noise removal filter is connected to the collector side of the transistor 63. A resistor 67 and a capacitor 68 are connected.
For example, the time constant of the resistor 67 and capacitor 68 is
Increased to 50m sec. When an ultrasonic signal with a frequency of ₁ is not supplied to the base of the transistor 61, no signal is obtained at its collector, so the transistor 62 is off and its collector potential is "1", and the transistor 63 is on and its collector potential is "1". "0", the transistor 64 is off and its collector potential is "1".

Then, the above-mentioned ₁ is connected to the base of the transistor 61.
When an ultrasonic signal P ₁ with a frequency of is supplied, it is extracted by a bandpass filter C ₁ and
When the transistor 62 is turned on, its collector potential S _C becomes "0" (FIG. 3C), and when the transistor 63 is turned off, its collector potential S _D becomes "1".
Therefore, the transistor 64 is turned on and its collector potential S _E becomes "0". However, in this case, since the time constants of the resistor ₆₇ and the capacitor 68 are large, the collector potential S _D of the transistor 63 does not rise immediately, and τ _1
After a time of E). In addition,
When the ultrasonic signal _P1 stops and the transistor 63 is turned on, its collector potential S _D immediately returns to "0", so at the end of the interval T _A , the transistor 64 is turned off and its collector potential S _E
returns to "1".

In this way, when a predetermined detection output is obtained from the detector D ₁ of the discrimination circuit 33, that is, the detector
Collector potential S _E of transistor 64 of D ₁ is “0”
Then, the same thing can be obtained for line 35,
A reset pulse S _R is obtained from the reset circuit 36 (FIG. 3F), this reset pulse S _R is supplied to the channel memory 34, and the channel code stored up to now is changed to the channel corresponding to the channel. The channel selection circuit 37 selects a channel using the rewritten channel code, and this is displayed on the display circuit 38.

Further, in the receiver 200, the signal obtained on the line 35 is supplied to the AND circuit 45, and the reset pulse S _R causes the monostable multivibrator 4
2 is triggered and its output S _G is τ ₂ from the time when the channel code is rewritten in the channel memory 34 to a certain point after the interval T _A
This output S _G is supplied to the AND circuit 45, and the output S _H of the AND circuit 45 becomes "1" in a certain period T _B immediately after the period T _A (FIG. 3G). ” (Figure H).

Then, in this interval T _B , the power switch 43 is turned on, and the frequency of the ultrasonic generator 39 is checked by the frequency switching signal based on the channel code rewritten in the channel memory 34 from the frequency switching circuit ₄₀ . Ultrasonic signal for
R _i (FIG. 3 I) is obtained and transmitted from the speaker 41.

In the commander 100, the other output _A of the monostable multivibrator 23 is "1" in the section T _B.
Therefore, in this section T _B , the power switch 25 is turned on. Therefore, the confirmation ultrasonic signal R _i of frequency ₁ transmitted from the receiver 200 is received by the microphone 17 in the commander 100,
It is supplied to the discrimination circuit 19 through the amplifier 18,
The signal is extracted from the bandpass filter A ₁ , a predetermined detection output is obtained from the wave detector B ₁ , and a channel code corresponding to the channel is obtained from the code generation circuit 20 .

Therefore, an output is obtained from the comparison circuit 21 indicating that the code from the code generation circuit 20 matches the code from the memory 15, and the display circuit 2
At step 2, for example, the amplifier lights up, confirming that the channel has been selected on the receiver 200.

If the receiver 200 does not switch channels or selects another channel even though the commander 100 selects a channel, the comparison circuit 2 of the commander 100
Since no coincidence output is obtained from 1 and the lamp does not light up on the display circuit 22, it can be seen that the channel was not selected.

In addition, in the commander 100, the output _A of the monostable multivibrator 23 is "0" in the section T _A.
Since the power switch 25 is off in the section T _A , the control ultrasonic signal transmitted from the commander 100 is not received by the commander 100 itself as a confirmation signal.

Further, in the receiver 200, in the section T _B , the output _H of the inverter 46 is "0" and the power switch 4 is turned off.
4 is off, the confirmation ultrasonic signal transmitted from the receiver 200 is not received by the receiver 200 itself as a control signal.

Note that in the commander 100, the comparison circuit 2
1 may be stored in a memory, and the output of this memory may be supplied to the display circuit 22 so that it is displayed even after the channel selection operation is completed.

In addition, the output of the channel memory 15 is also supplied to the display circuit 22, and the receiver 200 displays the commander 10.
When a channel is selected as selected in 0, the selected channel number may be lit with a lamp.

Note that the display may be performed with sound.

As described above, according to the present invention, it is possible to reliably check from the commander at hand whether or not the receiver has tuned the channel in accordance with the tuning operation on the commander, which is extremely convenient. Moreover, since the receiver transmits the confirmation signal after stopping receiving the control signal from the commander, the control signal from the commander and the confirmation signal from the receiver may be in the same form, for example, at the same frequency.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an example of the device of this invention, and FIG.
The figure is a connection diagram of an example of a part thereof, and FIG. 3 is a waveform diagram for explaining the operation. 11 is a group of tuning switches, 12 and 39 are ultrasonic generation circuits, 13 and 40 are frequency switching circuits, 15
and 34 are channel memories, 19 and 33 are discrimination circuits, 21 are comparison circuits, 22 are display circuits, 3
5 is a tuning circuit.

Claims (1)

[Claims] 1 Consists of a commander and a receiver, the commander is provided with a control signal transmitting section, a memory, a confirmation signal receiving section, and a display section; the receiver is provided with a control signal receiving section and a confirmation signal transmitting section; When a channel is selected in the commander, a signal corresponding to the selected channel is transmitted from the commander's control signal transmitting section and is stored in the memory, and in the receiver, the control signal receiving section receives this signal and selects the channel. When a station is broadcast, a signal in the same manner as the transmitted signal from the commander is sent from the confirmation signal transmitting section according to the channel selected by this receiver after the control signal receiving section stops receiving the above. The confirmation signal receiving unit of the commander receives the confirmation signal after the transmission from the commander has stopped, and compares it with the transmission signal from the commander read from the memory to determine a match; A remote control device capable of confirming the channel selection by displaying the discrimination output.