KR800000096B1 - Remote control - Google Patents

Abstract

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Description

Remote control

1 is a circuit diagram of a signal generator applied to a remote control device of the present invention.

1, b and c are waveform diagrams of signals in the apparatus.

2 is a circuit diagram of a remote control transmitter in a remote control device according to an embodiment of the present invention.

2, b, c and d are waveform diagrams of signals at the same transmitter.

3 is a circuit diagram of a remote control receiver in a remote control device according to an embodiment of the present invention.

3, b and c are waveform diagrams of signals in the apparatus.

The present invention relates to a remote control apparatus for use in the case of remote control of channel switching of a television receiver.

In the remote control method using light as a control signal, it is being studied not to light the light by direct current, but to light the high frequency signal so that the remote control device is not sensitive to the light existing in nature. .

However, in recent years, mechanisms for lighting fluorescent lamps with direct current power have been manufactured, and these mechanisms usually convert direct current into high frequencies of 15 KHz to several 10 KHz by inverters and light them, and this frequency is often not constant. Therefore, there is a possibility of causing a malfunction of the above-mentioned fluorescent lamps only by modulating the light transmitted from the remote control device using the light medium as a high frequency signal.

Therefore, in order to avoid this, the present invention provides a control signal by modulating the high frequency signal again to a low frequency, demodulating it, and extracting a low frequency component. However, if the normal AM modulation is used, the circuit becomes complicated and the low-frequency piezoelectric has a disadvantage that the portion to be used becomes large and the light modulation is also troublesome.

Thus, the present invention can be used, for example, for remote control of a television receiver, and provides a remote control device that is free from malfunctions by using a signal in which high frequency modulation and low frequency modulation are used as a remote control signal. For the purpose of Moreover, an object of this invention is to provide the remote control apparatus which can generate | generate such a remote control signal easily. Another object of the present invention is to provide a remote control device capable of accurately controlling a remote control device by receiving a remote control signal as described above.

In order to achieve the object as described above, in the present invention, as shown in FIG. 2C, for example, modulation of a predetermined medium, for example, light into a high main fruit tree (40 KHz, etc.) is again performed. A signal modulated at a frequency (1 KHz, etc.) (intermittent modulation in the drawing) is used as a signal for remote control.

In order to generate such a signal, a resistor is connected to each of the first collector and the emitter to which the bias is applied to the base, and the collector of the first transistor (the emitter follower is connected). A capacitor is connected between the base of the second transistor and the emitter of the first transistor and the emitter of the second transistor to form a multivibrator, and to the collector of the second transistor. An apparatus comprising an oscillation circuit which connects a resonance circuit and oscillates at a frequency higher than the repetition frequency of the multivibrator when the second transistor is conducting is used.

Next, the present invention will be described in detail with reference to the drawings.

First, the apparatus for generating a signal for remote control used in the remote control apparatus of the present invention will be described.

In the signal generator shown in FIG. 1, the emitters of the transistors 1 and 2 are combined with the condenser 3 to form an unstable multivibrator with emitter coupling. Here, the emitters of the transistors 1 and 2 are grounded with resistors 4 and 5, respectively, and a parallel circuit of the resistor 6 and the capacitor 7 is inserted between the base and thead of the transistor 1. The base is connected to the DC power supply terminal 9 via a resistor 8. The collector of the transistor 1 is connected to the terminal 9 via a resistor 10 and coupled to the base of the transistor 2 via a condenser 11 at the same time.

로, τ₂의 기간은 트랜지스터(2)가 도통(導通)하고, τ₃의 기간은 트랜지스터(1)가 도통(導通)하고 있다.The base of the transistor 2 is connected to the terminal 9 via a resistor 12 and the collector is directly connected to the terminal 9. Transistor 1 thus acts as the base ground amplifier of the emitter input and transistor 2 acts as the emitter follower amplifier of the base input. In this circuit configuration, the oscillation waveform at the base of the transistor 2 is as shown in FIG.

In the period of τ ₂ , the transistor 2 conducts, and in the period of τ ₃ , the transistor 1 conducts.

Since the transistor 2 operates as an emitter follower as a multivibrator, the transistor 2 has a sufficiently low impedance with respect to the oscillation frequency of the multivibrator. Therefore, the oscillation output signal of the square wave can be taken out with very low impedance in this transistor 2. For this reason, this type of unstable multivibrator can omit the emitter follower circuit which was added and installed in order to take out an oscillation output signal with low impedance, and can obtain a simple signal generator. In this signal generator, since the transistor 2 operates with low impedance as an emitter follower amplifier, a resonant circuit is installed in the collector circuit of the transistor 2 without disturbing the operation as the multivibrator. Therefore, the oscillation resonant circuit is provided in the collector circuit of the transistor 2 to form a separate high frequency oscillation circuit so that the oscillation of this high frequency is performed only when the transistor 2 is conducting. It is possible to obtain a high frequency signal which is interrupted by the oscillation period of the multivibrator.

A circuit example of such a signal generator is shown in FIG. In the signal generator of FIG. 1A, in addition to the above-described configuration, a parallel resonant circuit having the collector coil 13 and the capacitor 14 of the transistor 2 is provided again, and the other end of the resonant circuit is for feedback. It is connected to the base of the transistor 2 via the capacitor | condenser 15 of.

The intermediate wrap of the coil 13 is connected to a DC power supply terminal. Transistor 1 thus acts as the base ground amplifier of the emitter input and transistor 2 acts as the emitter follower amplifier of the base input.

의 τ₂기간은 트랜지스터(2)가 도통(導通)하고, τ₃의 기간은 트랜지스터(1)가 도통(導通)하고 있다. 그리고, 트랜지스터(2)는 멀티바이브레이터로서는 에미터 폴리워로서 동작하고 있기 때문에, 멀티바이브레이터의 발진주파수에 대해서는 충분히 낮은 임피이던스를 갖고, 콘덴서(14)와 코일(13)과의 공진회로를 트랜지스터(2)의 콜렉터에 접속하여도 멀티바이브레이터의 동작으로서는 하등의 지장을 초래하지 않는다. 또 코일(13)을 감아 올려서 그 한쪽의 단자에서 멀티바이브레이터의 발진주파수에 대하여 충분히 높은 임피이던스를 갖도록한 콘덴서(15)를 통하여 트랜지스터(2)의 베이스에 접속하므로서 트랜지스터(2) 코일(13), 콘덴서 (14)(15), 저항(5),(12)에 의하여, 하틀리이(Hartley)형의 발진회로가 구성된다.In this configuration, the oscillation waveform at the base of the transistor 2 is shown in Fig. 1, and the repetition frequency is

In the τ ₂ period, the transistor 2 conducts, and in the τ ₃ period, the transistor 1 conducts. Since the transistor 2 operates as an emitter layer as a multivibrator, the transistor 2 has a sufficiently low impedance with respect to the oscillation frequency of the multivibrator, and the resonant circuit between the capacitor 14 and the coil 13 is connected to the transistor 2. Even if connected to the collector, the operation of the multivibrator does not cause any trouble. Furthermore, the coil 13 of the transistor 2 is wound up by connecting the coil 13 to the base of the transistor 2 through a capacitor 15 wound up to have an impedance sufficiently high with respect to the oscillation frequency of the multivibrator at one terminal thereof. The capacitor 14, 15, resistors 5, 12 form a Hartley oscillation circuit.

As a result, a high frequency interrupted oscillation circuit as shown in FIG.

As a specific example, when the high frequency sinusoidal wave of about 40 KHz oscillated by the Hartley oscillation circuit by the transistor 2 is interrupted at a low frequency of 1 KHz oscillated by the multivibrator The values of each element of Resistor (8) = 15KΩ, Resistor (6) = 39KΩ, Capacitor (7) = 1㎌, Resistor (10) = 3.3KΩ, Capacitor (11) = 0.056㎌, Resistor (12) = 12KΩ , Resistance 4 = 470?, Capacitor 3 = 10 ㎌, resistance 5 = 100?, Coil 13 = 14 mH, capacitor 12 = 1200 pF, capacitor 14 = 0.01 μF.

As described above, according to this signal generator, a signal waveform obtained by interrupting high frequency with a very simple configuration can be obtained.

Next, the case where such a signal generating device is applied to a remote control device such as a television receiver will be described.

2 shows the transmitter for the remote control and FIG. 3 a shows the receiver for the remote control, respectively.

In the transmitter shown in FIG. 2A, an oscillation circuit 16 substantially identical to that shown in FIG. 1A is installed, and a switch 18A for turning on and off the supply of power from the power source 17. FIG. ) And 18B are installed in series with this power supply 17, and the capacitors 19, 20A, and 20B for determining the oscillation frequency at a high frequency are the collector and power supply of the transistor 2 ( A switch 21 is installed in series with the condenser 20A. 20B and is installed between 17 and 20B and interlocks with the switch 18B to switch the insertion of the condenser 20A, 20B. . A secondary coil 22 coupled to the coil 13 is installed, one of which is connected to the base of the switching transistor 24 via a power supply 17 and the other via a resistor 23.

로 τ₂의 기간은 트랜지스터(2)가 도통(導通)하고 τ₃의 기간은 트랜지스터(1)가 도통(導通)하고 있다.The collector of the transistor 24 is connected to the switches 18A and 18B, and a light emitting diode 25 is installed between the emitter and the power supply 17 to emit a remote control optical signal. have. In this configuration, the transistor 1 operates as the base ground amplifier of the emitter input and the transistor 2 operates as the emitter follower amplifier of the base input. The oscillation waveform of the multivibrator at the base of the transistor 2 is shown in Fig. 2b, and the repetition frequency

In the period of τ ₂ , the transistor 2 conducts, and in the period of τ ₃ , the transistor 1 conducts.

As a result, the transistor 2, the resistor 12, the coil 13, the capacitors 14, 15, 19, 20A, and 20B are provided only during the period in which the transistor 2 conducts. The oscillation is performed at a high frequency, and as shown in FIG. 2C, an oscillation output signal in which the high frequency oscillation signal is interrupted at the oscillation cycle of the multivibrator is obtained. The oscillation output signal is applied to the switching transistor 24 by the secondary coil 22. As a result, a driving current as shown in FIG. 2 d flows to the light emitting diode 25, thereby emitting light. In the diode 25, the optical signal for remote control which is modulated at a high frequency and interrupted at a low frequency of the multivibrator is emitted.

For example, in this case, the frequency of the interruption indicated by T ₁ is selected to be about 1 KHz, and the high frequency represented by T ₂ is selected to be about 40 KHz. However, this high frequency is about 40 KHz when the switch 18A is operated, and is about 37 KHz, which is about 3 KHz lower than when the switches 18B and 21 are operated. In case of channel switching and volume switching, separate frequency is used, so two series of remote control is achieved.

Next, in the receiver shown in FIG. 3A, an optical signal-electrical signal change circuit 27 having a port transistor 26 which receives such an optical signal is installed. The signal as shown in Fig. D is obtained. The received signal is amplified by the amplifying circuit 28 and the amplifying transistor 29 and then applied to the two signal selection circuits 30 and 31 mounted on the collector of the transistor 29.

A resonant circuit is provided on the secondary side together with the signal selection circuits 30 and 31. One signal selection circuit 30 is tuned to 40 KHz, and the other signal selection circuit 31 is 37 KHz. I'm in tune. Therefore, when the switch 18A is operated by the transmitter shown in FIG. 2A, only the output terminal of the signal selection circuit 30 is operated. When the switches 18B and 21 are operated, the signal selection circuit 31 of the signal selection circuit 31 is operated. The output is generated only at the output terminal, and the remote control function is selected.

Of course, by increasing the type of the high frequency of this signal and installing many signal selection circuits, an arbitrary number of control functions can be selected. The waveform of the signal obtained by the selection by the signal selection circuits 30 and 31 is as shown in FIG. 2C, and this signal is a detection circuit connected to the output terminals of the signal selection circuits 30 and 31. Detected in (32) and (33), it becomes as shown in FIG. In addition, this signal (FIG. 3) is a noise light signal which is not interrupted by the differential circuit by the capacitor | condenser 34 and the resistor 35 which were installed next to the detection circuit 32. Or after the signal modulated at a lower frequency is removed, it is applied to the base of the transistor 36 and amplified and supplied to the clamp diode 38 via the DC removing capacitor 37 so that the lowest level of the signal is grounded. It is clamped to an electric potential, and it is applied to the integral circuit comprised by the diode 39 and the capacitor | condenser 40, and the integrated voltage like FIG. 3 is generated in this capacitor | condenser 40. FIG.

The integrated voltage is applied to the base of the switching transistor 41. In the switching transistor 41, the signal of FIG. 3b is repeated several cycles or more, and the integral voltage of FIG. When the time is exceeded, the time constant of the integrating circuit and the bias voltage of the switching transistor 41 are selected so as to be conductive. In addition, a control relay is installed in the collector of the switching transistor 41 so that a remote control device such as a channel switching device of a television receiver can be controlled when the transistor 41 is turned on. In addition, although the part before these capacitor | condenser 34 is abbreviate | omitted after the detection circuit 33 of FIG. 3 a, it is installed similarly.

As described above, according to this apparatus, a modulated light at a high frequency is used as a remote control signal at a frequency lower than the frequency, and since such a signal rarely exists in the natural world, Will not cause a malfunction (誤 動作). In addition to using an optical signal, an arbitrary signal such as an ultrasonic signal or a radio wave signal may be used.

Claims (1)

A resistor is connected to the collector and the emitter of the first transistor to which the bias is applied to the base, respectively, between the collector of the first transistor and the base of the second transistor and the emitter and the first transistor of the first transistor. In an emitter-coupled multivibrator configured by connecting condensers to emitters of two transistors, respectively, when the second transistor is conducting by connecting a resonant circuit to the collector of the second transistor. A signal oscillating at a frequency higher than the repetition frequency of the vibrator, and modulating a signal such as light at a high frequency and intermittently modulating the signal modulated at this high frequency to a lower frequency as a remote control signal. Control unit.

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