JPH089989Y2 - Remote control circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a remote control circuit, and more particularly to a remote control circuit that can handle two types of remote control signals.

<Prior Art> A remote control unit for remotely controlling electric equipment is provided with a large number of keys, and when a predetermined key is operated, a code corresponding to the key is bit-serially generated and a predetermined frequency signal (for example, 38 KHz) is generated by the code signal. The signal) is modulated and transmitted to the electric device, the receiving unit built in the electric device demodulates the transmitted code signal, and the control unit of the microcomputer configuration executes control according to the code signal.

FIG. 6 is an explanatory view of a conventional remote control unit.
Is a key matrix in which many operation keys are arranged, and 2 is 38
KHz oscillator circuit, 3 is a switch for switching the operation keys for tuner and deck, 4 is a display section showing that a code is being transmitted,
Reference numeral 5 is an IC circuit (control section) that generates a code corresponding to the operation key in a bit serial manner, amplitude-modulates a 38 KHz signal by the code, and outputs it, and performs display control, and 6 is an output signal CDS from the IC circuit. Is an optical output unit that outputs infrared rays by turning on / off the infrared light emitting diode IFD.

Since such a conventional remote control unit is equipped with a large number of keys, there is a problem in that it becomes large and heavy and difficult to handle. In particular, a remote control unit such as an audio device provided in the interior of an automobile is handled by a driver or a passenger, so that it is inconvenient when it is large and heavy, and a small and lightweight remote control unit is desired.

Therefore, the applicant of the present application proposed a small and lightweight remote control unit, and applied for a utility model registration as a "remote control device for electric equipment" on September 21, 1988. This proposed remote control unit has one operation key corresponding to a predetermined function (for example, pause on / off or play / stop) of a controlled device to be remotely controlled, and a bit serial code corresponding to the operation key. And a light output unit that outputs the infrared light to the outside by turning on / off the light emitting diode by the output of the control unit and modulating the 38 KHz signal by the bit serial data and outputting it. .

Since the proposed remote control unit (referred to as a single-function remote control unit) has only one operation key, it is small and lightweight, and the operability is improved.

<Problems to be Solved by the Invention> By the way, as shown in FIG. 7, the remote control circuit 12 (which is composed of the receiving unit 12a and the control unit 12b of the microcomputer configuration) built in the controlled device 11 has a single function. Remote control units 13a, 13b, ... 13n (Ka to Kn are operation keys)
It is necessary to be able to control the device based on not only the remote control signals Ra to Rn from the remote control unit 14 but also the signal RS from the remote control unit 14 having the same configuration as the conventional one.

For this reason, the proposed single-function remote control unit has a code signal of 38 KHz, similar to the conventional remote control unit.
A remote control signal in the form of a modulated signal is output to the outside by infrared rays. Therefore, the single-function remote control unit has only one operation key and still requires expensive peripheral circuits and IC circuits (control section), and the single-function remote control unit has only one operation key. Therefore, a number of single-function remote control units are required according to the function to be remotely controlled, which causes a problem of increasing the cost of the remote control system as a whole.

In view of the above, an object of the present invention is to provide a remote control circuit capable of controlling a device regardless of a signal from a single-function remote control unit or a conventional remote control unit and reducing the cost of the single-function remote control unit. That is.

<Means for Solving the Problem> In the present invention, the above-mentioned problem is that the remote control signal is detected from the first or second remote control unit, and the remote control signal is detected to detect the detection output. An identification unit for identifying the frequency or cycle, a code conversion unit for converting the identified frequency or cycle into a code corresponding to the operation key of the remote control unit, and control for controlling the controlled device based on the remote control signal from the remote control unit. This is achieved by configuring a remote control circuit with the section.

<Operation> When a remote control signal is received from the first remote control unit that generates a bit-serial code signal according to the operated key, modulates a predetermined frequency signal with the code signal, and transmits the modulated signal, the received signal is It detects and controls the equipment based on the code included in the detection output. On the other hand, when a remote control signal is received from a second remote control unit that generates a constant low frequency signal according to the operated key, modulates the predetermined frequency signal with the low frequency signal, and transmits the modulated signal, the received signal is received. Is detected, the frequency or cycle of the detected output is identified, the identified frequency or cycle is converted into a code corresponding to the operation key of the remote control unit, and the device is controlled based on the code.

<Embodiment> FIG. 1 is a block diagram of a remote control circuit according to the present invention. In the figure, 21 is the first remote control unit,
22-n, 22-1, 22-2, ... 22-n are second remote control units, and 23 is a remote control circuit built in the controlled device.

The first remote control unit 21 is a remote control unit having the same structure as the conventional one shown in FIG. 6, and has a large number of operation keys.
Generates a bit-serial code signal according to the operated key internally, modulates the 38 KHz signal with the code signal,
The modulation output turns on / off the light emitting diode and outputs infrared rays to remotely control the controlled device. As shown in FIG. 2, a start signal having a predetermined width (for example, 9 msec) is inserted at the beginning of the code signal, and the receiving side identifies the start signal and decodes subsequent codes. There is.

The second remote control unit 22-i (i = 1, 2, ..., N) is a single-function remote control unit, and as shown in FIG. 3 (a), one on / off type operation key 22a and a key 22a. When is turned on, a low frequency signal generator 22b that generates a constant low frequency signal FS according to the key and a 38 KHz signal is output when the low frequency signal FS is at high level, and when it is at low level, 38KHz oscillator to stop output (38KHz for low frequency signals
An amplitude modulator 22c that modulates a signal), a transistor 22d that is turned on / off based on the modulator output, and a light emitting diode 22e that is repeatedly turned on / off at an on / off frequency of the transistor. The second remote control unit 22-
1, 22-2, ... 22-n low frequency signal generator
The frequency of the signal output from 22b is different. Third
FIG. 3B shows an embodiment in which the second remote control unit is composed of an inexpensive NAND gate, and the same parts as those in FIG. 3A are designated by the same reference numerals.

The remote control circuit 23 includes a receiving unit 24 that receives and detects infrared rays from the remote control unit, and a remote control discriminating unit 25 that discriminates whether the received signal is the signal from the first or second remote control unit. , A frequency discriminating section 26 for discriminating the frequency of the detection output outputted from the receiving unit, and operating keys for the discriminated frequencies of the second remote control units 22-1, 22-2, ... If the infrared signal is a signal from the first remote controller unit 21, the device is controlled based on the code included in the detection output, and the second remote controller unit 22-i If the signal from
It has a control unit 28 having a microcomputer configuration for controlling the device based on the code from the code conversion unit 27.

The receiving unit 24, as shown in FIG. 4, is a photo-detecting diode 24a that receives 38 KHz infrared rays from the remote control unit.
An amplifier 24b, a limiter 24c, a 38KHz bandpass filter 24d, a detection circuit 24e that detects the bandpass output and outputs the original bit-serial code signal or low-frequency signal, and the detection output is shaped into a rectangular wave. Wave shaping circuit 2
It has 4f and an output circuit 24g.

If the pulse width of the leading pulse in the detection output is a predetermined value (for example, 9 msec), the remote control discriminating unit 25 regards it as a remote control signal from the first remote control unit 21, and if it is not the predetermined value, the second remote control unit 22- It is determined to be a remote control signal from i. That is, if there is a start signal of a predetermined width during the detection output, the signal from the first remote control unit 22 and if there is no start signal, the second remote control unit 22-
The signal from i is determined.

The frequency / code conversion unit 27 stores a correspondence relationship between frequencies and codes in advance, and outputs the identified code.

 Next, the overall operation of FIG. 1 will be described.

When a predetermined key is operated, the first remote controller unit 21 generates a bit-serial code signal corresponding to the key, amplitude-modulates the 38 KHz signal with the code signal, and turns on / off the light emitting diode according to the modulation signal. And outputs 38 KHz infrared to the controlled device (eg car audio device).

When the receiving unit 24 of the remote control circuit 23 receives the infrared ray, it detects the infrared ray and outputs the original code signal.
A start signal having a predetermined width is included at the beginning of the code signal.

The remote controller discriminating unit 25 monitors whether or not a start signal having a predetermined width is present at the beginning of the detection output, and if present, determines that the infrared ray is from the first remote controller unit 21, in other words, the code signal after the start signal. It is determined that the remote control semi-separated signal RDT of high level and the control unit 2 of the microcomputer configuration.
Enter in 8.

When the remote control discrimination signal RDT is at high level, the control unit 28 generates a control signal such as play-on / off, fast-forward / rewind, seek-on / off, etc. based on the code signal which is the detection output of the receiving unit 24. Control the car audio device.

On the other hand, when the key is operated, the second remote control unit (single-function remote control unit) 22-i (i = 1, 2, ..., N) generates a constant low frequency signal corresponding to the key, The 38KHz signal is amplitude-modulated with a low-frequency signal, the light-emitting diode is turned on / off by the modulation signal, and 38KHz infrared light is output to the car audio device.

When the receiving unit 24 of the remote control circuit 23 receives the infrared ray, it detects the infrared ray and outputs the original low frequency signal.

The remote controller discriminating unit 25 monitors whether or not a start signal of a predetermined width is present at the beginning of the detection output, and if there is not, the infrared ray is from the second remote controller unit 22-i (i = 1, 2, ... N). In other words, it is determined that the detection output is a low frequency signal (not a code signal), and the remote control discrimination signal RDT is set to low level.

In parallel with this remote controller discrimination, the frequency discriminating unit 26 discriminates the frequency of the detection output, and the data indicating the frequency is
Input to the code conversion unit 27. The frequency / code conversion unit 27 converts the input frequency data into a code corresponding to the operated key and outputs it.

When the remote control discrimination signal RDT is at a low level, the control unit 28 takes in the code signal output from the frequency / code conversion unit 27, and based on the code signal, play-on / off or fast-forward / rewind or seek-on. A control signal such as ON / OFF is generated to control the car audio device.

In the above explanation, when there is no start signal,
Although the frequency of the detection output signal is identified and the code corresponding to the frequency is generated, the detection output signal may be configured to identify the cycle and generate the code according to the cycle.

Also, the case where the on / off type key is provided as the operation key of the second remote control unit has been described.
A switchable key may be provided. FIG. 5 is a block diagram of a second remote control unit (single-function remote control unit) provided with such a switch type key, and the same parts as those in FIG. 3 are designated by the same reference numerals. The difference from FIG. 3 is that the operation key 22a is changed from the ON / OFF type to the switching type, and the low frequency signals FS ′ and FS ″ which are different from each other at the fixed contacts A and B are generated. The point is that the containers 22b 'and 22b "are provided. In addition, move the movable contact from the midpoint position M to A.
The first low-frequency signal generator 22b 'starts oscillating when tilted to the contact side, and the second low-frequency signal generator 22b "starts oscillating when tilted from the midpoint position to the B contact side.

<Effects of the Invention> As described above, according to the present invention, a remote control signal is generated from the first remote control unit that generates a bit-serial code signal according to the operated key, modulates a predetermined frequency signal with the code signal, and transmits the modulated signal. When received, the received signal is detected and the device is controlled based on the code included in the detected output, while the signal of a constant frequency is generated according to the operated key, and the predetermined frequency signal is generated by the signal. Second remote control unit that modulates and transmits (single-function remote control unit)
When the remote control signal is received from, the received signal is detected, the frequency or cycle of the detected output is identified, the identified frequency or cycle is converted into a code corresponding to the operation key of the remote control unit, and based on the code. Since the device is configured to be controlled by a single function remote control unit or a conventional remote control unit, the device can be controlled, and the single function remote control unit has one operation key and is relatively simple. It can be inexpensively configured with one or two low-frequency signal generators, a 38 KHz oscillator, and a light emitting diode.

[Brief description of drawings]

FIG. 1 is a block diagram of a remote control circuit according to the present invention, FIG. 2 is a waveform diagram of a remote control signal transmitted from a first remote control unit, FIG. 3 is a block diagram of a single-function remote control unit, and FIG. Block diagram of the receiving unit of the control circuit, FIG. 5 is another block diagram of the single-function remote control unit, FIG. 6 is a block diagram of a conventional remote control unit (first remote control unit), and FIG. 7 is a block diagram of a remote control system. Is. 21 …… First remote control unit 22-i …… Second remote control unit 23 …… Remote control circuit 24 …… Reception unit 25 …… Remote control identification unit 26 …… Frequency identification unit 27 …… Frequency / code conversion unit 28 …… Control unit

Claims (1)

[Scope of utility model registration request] 1. A command from a first remote control unit for modulating and transmitting a predetermined frequency signal with a bit-serial code signal corresponding to an operated key, or a signal of a constant frequency according to an operated key. In a remote control circuit of a device that is controlled based on a command from a second remote control unit that modulates and transmits a predetermined frequency signal, it is determined whether the received signal is a signal from the first or second remote control unit. Discriminating unit, a discriminating unit for detecting the received signal and discriminating the frequency or period of the detected output, a code converting unit for converting the discriminated frequency or period into a code corresponding to the operation key of the remote control unit, and the received signal Is a signal from the first remote control unit, the device is controlled based on the code included in the detection output, and the second
A remote control circuit having a control unit for controlling a device based on a code from a code conversion unit if it is a signal from a remote control unit.