KR930007393Y1 - Remocon circuit in video apparatus - Google Patents

Abstract

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Description

Wireless remote control transmitter and receiver circuit in video equipment

1 is a detailed circuit diagram of a remote control transmission circuit according to the present invention.

2 is a detailed circuit diagram of a remote control receiving circuit according to the present invention.

Figure 3 is an output waveform diagram of each part for explaining the operation of the transmission of the present invention.

4 is an encoder / decoder output diagram of a remote control receiver circuit applied to the present invention.

* Explanation of symbols for main parts of the drawings

1: oscillator 2: differential circuit

3,10, I1-I5: Inverter 4: Monostable Multivibrator

5: preamplifier 7,11: integrator

8 buffer 9 voltage amplifier

12: switching circuit 13: encoder / decoder unit

14: electronic switch control unit 15: key matrix circuit

C1-C9: capacitor R1-R42: resistor

D1-D10: Diode Q1-Q5: Transistor

T1, T2: Light emitting and light receiving element SW1-SW4, SW1'-SW4 ': Tact switch

The present invention relates to a wireless remote control transmission and reception circuit in a video device, and in particular, it is possible to remotely control the remote control signal reading and processing by using hardware without using expensive microcomputer to control remotely by executing a predetermined program. I would have to.

Conventional remote control transmission and reception circuits are well known of the microcomputer program method for receiving input signals from a remote controller having a plurality of function keys and performing a corresponding function in a predetermined program order.

However, the microcomputer control method based on such a program method additionally requires basic peripheral circuits to execute a program. Thus, even when applied to a small television set that requires little control function, the microcomputer control method is generally used according to a predetermined program production. There was a problem that can increase the manufacturing cost more than necessary due to the increased cost.

The present invention is conceived in view of the above-described conventional problems, and is classified into a tact switch on operation of grounding an output pulse width to different resistance values by a monostable multivibrator that controls a spike signal component that differentiates a predetermined oscillation frequency. A transmitter that transmits an optical signal, and encodes DC level detection as a differential input according to several pulse widths integrated with the received signal, and then drives one of several decoded outputs according to each DC level. In the same way as the operation of the tact switch in the system, the wireless remote controller transmits / receives a video device that can read and process the wireless remote controller transmit / receive signals by hardware without using a microcomputer program. Its purpose is to provide a circuit, and is illustrated in the accompanying drawings below. It will be described in detail over the subject innovation.

As shown in FIG. 1 and FIG. 2, the wireless remote control transmitter / receiver circuit of the present invention includes an oscillator 1 which generates a spherical and oscillation signal at a predetermined period by combining a resistor R1 and a capacitor C1. And a differential circuit (2) comprising a condenser (C2) and a resistor (R2) to differentiate the oscillation pulses generated by the oscillator (1), and to remove the negative pulses from the pulses differentiated by the differential circuit (2). An inverter 3 composed of a diode D1, resistors R3 and R5, and a transistor Q1 for inverting the positive pulse from which the negative pulse is removed from the diode D1, and the inverter ( The monostable multivibrator 4 which receives the inverted negative pulse by 3) and generates a transmission pulse based on the start point setting pulse, and each time constant value of each of the resistors R6-R9 and condenser C3. A plurality of tags for determining the output pulse width of the multivibrator 4 according to The switch SW1-SW4, the output signal inverting inverter I1 of the monostable multivibrator 4, the resistors R10 and R11, and the transistor Q2 constitute the final stage of the monostable multivibrator 4; By connecting the transmitter 5 for converting the output pulse into an optical signal and outputting it, and the light emitting element T1 for converting the output pulse of the monostable multivibrator 4 inverted by the transmitter 5 into an optical signal, A remote control transmission circuit configured, a light receiving element T2 for receiving an optical signal from the light emitting element T1 of the transmitting unit 5, and a preamplifier for reducing the light signal received from the light receiving element T2 into an electrical signal. (6), an integrator (7) composed of a resistor (R12) and a capacitor (C4) for converting the pulse width modulated signal amplified by the preamplifier (6) into a DC voltage proportional to the pulse width, and the integrator ( A buffer 8 for buffering the DC voltage integrated by 7) and the buffer A voltage amplifier 9 for amplifying the DC voltage through the signal 8 to a predetermined voltage, a zener diode D2 for detecting the DC voltage output from the integrator 7, a resistor R18, and a transistor Q5; And an inverter circuit (10) configured to inverter (I2) for reversing and reversing the phase only when a predetermined DC level of the integrator (7) detected through the zener diode (D2) is abnormal, and the resistor (R19) and the capacitor (C5). And a branch 11 for delaying a predetermined time according to the signal inverted from the inverter circuit 10 and a resistor 20 and transistors Q3 and Q4 to turn on / off the output signal of the voltage amplifier 9. The switching circuit 12 to turn off and the amplified output from the voltage amplifier 9 of the switching circuit 12 is input to encode a plurality of inverted stage signals, and decoded the encoded signals again to the combined signal to the inverting input terminal. Is applied to one output terminal corresponding to the coupling. Encoder / decoder section 13A comprising an encoder / decoder circuit 13A for outputting a call and a peripheral circuit (resistors R21-R38), an inverter I3-I5, a diode D3-D10 and a capacitor C6-C9. ), An electronic switch control unit 14 which controls to connect a line corresponding thereto according to each output state of the encoder / decoder unit 1, and a pull-up resistor R39- to which a separate supply power source Vcc is applied. R42) and a key matrix circuit 15 consisting of tact switches SW1'-SW4 'are provided with a remote control receiver circuit configured by interconnecting each other.

On the other hand, the differential circuit 2, the inverter 3 and the monostable multivibrator 4, the diode D1 for removing the negative polarity, the resistors R6-R9 and the capacitor C3 select the function of the remote control. The pulse width control output unit 16 is configured to variably control and output the pulse width to the clock input of the oscillator 1 in accordance with the tact switches SW1 to SW4.

The integrator 7, the buffer 8, and the voltage amplifier 9 integrate an input signal (output signal of the preamplifier 6), convert the DC signal into DC, and then amplify and output the input signal integrator and amplifier unit ( 17, and the inverter circuit 10, the integrator 11, the switching circuit 12, the resistor R13 and the zener diode D2 input the output signal of the input signal integrator and amplifying unit 17. The switching unit 18 is configured to supply or cut off the control according to the (light receiving) signal level.

Referring to the effects of the present invention configured as described above with reference to FIGS. 1 to 3 as follows.

First, an operation process of the remote control transmitter shown in FIG. 1 will be described. In response to the time constant set by the resistor R1 and the capacitor C1, the oscillator 1 oscillates and outputs a square wave as shown in FIG. 3a.

The square wave oscillation pulse is input to the pulse width control output unit 16 to output a signal having a predetermined pulse width according to the on / off of the tact switches SW1 to SW4.

That is, the positive spike pulse from which the negative spike pulse is removed through the diode D1 is differentiated into the positive and negative spike pulses by the differential circuit 2 composed of the capacitor C2 and the resistor R2. Is applied to (3).

The positive spike pulse applied to the inverter 3 is inverted by the inverter 3 as shown in FIG. 3b, and the inverted redundant pulse is applied to the monostable multivibrator 4.

As a result, the monostable multivibrator 4 generates the monostable multivibrator pulse based on the start point when the inverted negative pulse is applied to the start point setting pulse of the monostable multivibrator pulse. ) And the time constant between the corresponding resistor (R6-R9) connected when each tact switch (SW1-SW4) is turned on.

That is, assuming that the values of the resistors R6-R9 are R6 < R7 < R8 < R9, and each of the tact switches SW1-SW4 is turned on, the connection point C through the inverter I1 (a 'in FIG. As in (d '), a pulse width of t1-t4 can be obtained.

Here, the tact switch SW1-SW4 is a switch for selecting a remote control function. For example, each of the tact switches SW1-SW4 is a switch for selecting a function of channel up, channel down, volume up, and volume down. Correspondingly, this also applies to the tact switches SW1'-SW4 'on the receiving circuit side.

Therefore, the pulses t1-t4 having different pulse widths are converted into optical signals by the light emitting element T1 according to the driving of the transistor Q2 of the transmitter 5 according to the on operation of the tactile switches SW1-SW4. Is output.

On the other hand, in the operation of the remote control receiving circuit as shown in FIG. 2, first, the optical signal emitted from the light emitting element T1 of the transmitter 5 is received by the light receiving element T2 and the battery amplifier 6 Amplified and converted into an electrical signal.

At this time, the electrical signal is the same as the 3c diagram, and is converted into a direct current by the input signal integrator and amplifier 17 and amplified and output.

That is, the integrator 7 composed of the resistor R12 and the condenser C4 integrates each DC voltage proportional to each pulse width t1-t4.

Each of these integrated DC voltages is buffered through the buffer 8, adjusted to a predetermined amplification voltage from the voltage amplifier 9 to the amplifier OA2, input to the encoder / decoder section 13, and encoded and polarized.

That is, the output of the voltage amplifier 9 is input to the inverting terminals a4, a6, a8, a10 of the encoder / decoder circuit 13A, and the output of the voltage amplifier 9 is switched 18 according to the input signal level. ) Is under control.

That is, when the level of the DC signal output from the integrator 7 maintains the signal level equal to or higher than the zener voltage of the zener diode D2 (when the received signal is a normal remote control transmission signal, it is necessary to recognize the integral level). In the case of a sufficient level and in the case of noise or other signals, the zener diode D2 is turned off because the integration level is low) and the zener diode D2 is turned on.

When the zener diode D2 is turned on, the transistor Q5 of the inverter circuit 10 is turned on and the high signal inverted by the inverter 12 is inputted to the integrator 11 and integrated. The output signal of the voltage amplifier 9 is supplied to the encoder / decoder section 13 so that the transistors Q2 and Q3 of 12 are turned on.

As shown in the diagram of FIG. 4, assuming that the DC corresponding voltages applied to the output terminal V0 of the switching circuit 12 are respectively V21, V22, V23, and V24 while pressing the tact switches SW1 to SW4 of the transmitting circuit, respectively. When the tact switch SW1 or SW2-SW4 is pressed, the voltage levels V4, V6, V8, and V10 are commonly applied to the inverting terminals a4, a6, a8, and a10 of the encoder / decoder circuit 13A.

In addition, each of the resistors R32, R34, R29, R3O, and R23, R24, R25, R26 applied to the non-inverting terminals a5, a7, a9, a11 of the encoder / decoder circuit 13A. When the set voltages are V5, V7, V9, and V11, respectively, the input switch is input to the inverting terminals a4, a6, a8, and a10 of the encoder / decoder circuit 13A by pressing the tact switches SW1-SW4 of the sendiny circuit. The relationship between the applied DC voltages V21, V22, V23 and V24 and the voltages V5, V7, V9 and V11 set in the non-inverting terminals a5, a7, a9 and a11. V24 <V11 <V23 <V9 < When the whole is set as V22 &lt; V7 &lt; V21 &lt; V5, the state (V1, V2, V13, V14) of the output terminals a1, a2, a13, a14 of the encoder / decoder circuit 13A is as shown in the diagram of FIG.

For example, the DC voltage V24 is applied to the inverting terminals a4, a6, a8, a10 of the encoder / decoder circuit 13A when the tact switch SW4 of the transmitting circuit is pressed.

At this time, the DC voltage V24 input to the inverting terminals a4, a6, a8, a10 of the encoder / decoder circuit 13A and the voltages V5, V7, which are applied to the non-inverting terminals a5, a7, a9, a11. Since the relationship with V9 and V11 is V24 &lt; (V5, V7, V9 and V11), the output terminals a1, a2, a13 and a14 are all in a 'high' state, and the output of the output terminal a13 is' At the high 'level, the low signal inverted by the inverter I3 is applied to the non-inverting terminal a9 so that the output terminal a14 goes from high to low, and the low signal inverted to the inverter D4 through the diode D9. Is applied to the non-inverting terminal a7, the output terminal a1 goes from high to low, and the low signal in which the output terminal a1 signal, which was the high signal, is inverted to the inverter I5 through the diode D5, is non- In addition to the inverting terminal a5, the output terminal a2 goes from high to low.

At this time, the output terminals a1, a2, a14 of the encoder / decoder circuit 13A inverted to the 'low' state generate a spike pulse as shown in the diagram of FIG. 4, which is again connected to each output terminal. (D3) (D7) (D8) and the resistors R35 (R36) (R37) and the capacitors (C6) (C7) (C8) are finely divided and removed.

Therefore, when the tact switch SW4 of the transmitting circuit is depressed, only the output terminal a13 of the encoder / decoder circuit 13A becomes 'high', and this high signal is controlled by the electronic switch control unit 14 through the diode D10. The output terminal P4 corresponding to the input terminal P4 is connected to the ground so that the voltage input to the key input terminal K4 of the key control unit is input by the fly-up resistor R42 of the key matrix circuit 15. By going low, the tact switch (SW4, eg, volume down) is recognized as a luck.

In addition, when the other tact switches SW1-SW3 are pressed as in the above-described embodiment, each state of the encoder / decoder circuit 13A is 'high' because only the output terminals a14, a1, and a2 corresponding thereto are 'high'. Each time the outputs are applied to the control terminals O1-O4 of the electronic switch control unit 14, the electronic switch control unit 14 is line-connected between the corresponding output terminals P1-P4 and ground respectively according to their 'high' signals. The low pulses generated by the pull-up resistors R39-R42 of the key matrix circuit 15 are applied to the key input terminals K1-K4 of the key control unit, not shown.

In this operation, even if the receiving circuit side tact switches SW1'-SW4 'having a function corresponding to the tact switches SW1-SW4 of the transmitting circuit are turned on, one end of the pull-up resistors R39-R42 is grounded by the turned-on switch. As a result, a low pulse is generated so that the function control of the device by direct manipulation of the tact switches SW1'-SW4 'also functions.

As described above, according to the present invention, when each tact switch set in the transmitting circuit is pressed, the active key is driven every time the corresponding key input terminal is connected, such as pressing the tact switch of the receiving circuit. There is an effect that can easily remote control the video equipment such as a small TV receiver wirelessly.

Claims (5)

A remote control transmission circuit comprising the following components, an oscillator 1 for outputting a square wave oscillation signal, a tact switch SW1-SW4 for selecting a function of a remote control, and the tact switch SW1-SW4 turned on A pulse width control output section 16 for outputting a pulse width signal corresponding to each switch SW1-SW4 with the input of the oscillator 1 as a clock according to on / off, and the pulse width control output section 16 A transmission unit 5 for converting the pulse width signal outputted from the signal into an optical signal and transmitting the optical signal; A remote control receiving circuit comprising the following components, a light receiving element T2 for receiving the signal output from the transmitter 5, a preamplifier 6 for converting the received signal into an electrical signal, and outputting the preamplifier; An input signal integrating and amplifying unit 17 for converting and amplifying the output signal of (6) into direct current, and the input signal integrating and amplifying unit according to the level of the signal integrated in the input signal integrating and amplifying unit 17 ( A switch 18 for supplying or interrupting the signal amplified in 17) to the encoder / decoder 13 and the encoder for level decoding the signal supplied from the switch 18 to decode the remote control signal as a result of the comparison. / Decoder section 13, an electronic switch section 14 which is turned on / off in accordance with the decoding result output from the encoder / decoder section 13, and a predetermined value by the on / off of the electronic switch section 14 To generate pulses to control the Key matrix circuit 15 for outputting an input signal; Wireless remote control transmitter and receiver circuit in video equipment. The video apparatus according to claim 1, wherein a tact switch (SW1'-SW4 ') corresponding to the function of the tact switch (SW1-SW4) on the transmitting circuit side is connected to the key matrix circuit (15) of the remote control receiver circuit. Wireless remote control transmitter and receiver circuit. 2. The pulse width control output unit (16) according to claim 1, wherein the pulse width control output unit (16) includes a differential circuit (2) for differentially processing the output signal of the oscillator (1), and a diode (D1) for removing the negative component of the differential signal. ), An inverter 3 for inverting the differential signal negatively removed by the diode D1, and a monostable multivibrator 4 for generating a signal having a predetermined pulse width by using the output of the inverter 3 as a clock. And a wireless remote control transmitter / receiver in an image device comprising a resistor (R6-R9) and a capacitor (C3) for determining the pulse width of the monostable multivibrator (4) when the tact switch (SW1-SW4) is turned on. Circuit. 2. The input signal integrating and amplifying unit (17) according to claim 1, wherein the input signal integrating and amplifying unit (17) includes an integrator (7) for converting the output signal of the preamplifier (6) into direct current and a buffer (8) for amplifying the integrated signal. And a voltage amplifier (9) configured to amplify and output the output signal voltage level of the buffer (8). The zener diode (D2) of claim 1, wherein the switching unit (12) is turned on / off according to the level of the DC signal converted and output from the input signal integrator and amplifier unit (17) and the zener diode (D2). Inverter circuit 10 for inverting the signal input through the signal, an integrator 11 for integrating the signal inverted by the inverter circuit 10, and the integrated signal is turned on / off to integrate and amplify the input signal. A wireless remote control transmission / reception circuit in a video device comprising a switching circuit (12) for supplying or interrupting the output of the section (17) to the encoder / decoder section (13).