JPS6211315A - Remote control equipment - Google Patents

Abstract

PURPOSE:To prevent the malfunction of control by deciding that a remote control signal is affected by a disturbing signal. CONSTITUTION:A memory control means 11 reads or writes the data of channel selection or sound volume from/to a memory, a display signal generating means 12 displays the state of a TV receiver on a screen and a channel selection control means 13 controls the reception band and frequency of a turner. In this case, a remote control signal deciding means 14 decides the content of the remote control signal to control a control signal generating means 15 depending on the result of decision. When the pulse of the 23rd bit is inputted by a disturbing signal or the like, an output from a pulse presence absence deciding means 16 operates a reset means 17 to release the operation of a microcomputer and the decoding of 22 pulses is not performed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a remote control device that prevents malfunctions of the remote control due to interference signals.

BACKGROUND OF THE INVENTION In recent years, remote control functions have become indispensable for television receivers, and infrared control functions have come to occupy the majority of the functions. However, there is a lot of noise even in the infrared region, which may affect the operation of the remote control.

There are several conventional techniques for reducing the impact. For example, one method is to increase the ratio of the target signal to the interfering signal, such as by narrowing the band of the circuit or attaching a filter to the light-receiving section of the receiver to lower the sensitivity and increase the output of the transmitter.

A conventional remote control receiving device will be explained below with reference to the drawings.

FIG. 4 shows the configuration of a conventional remote control device. In FIG. 4, reference numeral 21 denotes a remote control receiving section that converts an infrared remote control signal into an electrical signal, which narrows the circuit band. 22 is a remote control transmitter that generates an infrared remote control signal and has a high output. 23 is an optical filter that attenuates infrared remote control signals and interference signals. 24 is a remote control receiving section 21
It is a cell microcomputer that decodes remote control signals converted into electrical signals and performs various functions on the television receiver. 26 is a remote control receiving section 21
, an optical filter 23°, and a remote control receiving device in a television receiver including a microcomputer 24.

The operation of the remote control device configured as described above will be explained below.

First, the remote control transmitter 22 generates an infrared remote control signal. If an interference signal is input from the outside at that time, the optical filter 23 attenuates the infrared remote control signal and the interference signal, and the remote control receiver 21, which has a further narrowed band, receives only the infrared remote control signal generated from the transmitter 22. Amplify and convert to electrical signal. The signal causes the microcomputer 24 to cause the television receiver to operate in accordance with the remote control signal generated from the transmitter 22.

Problems to be Solved by the Invention However, in the above configuration, the output of the remote control transmitter is increased and the cost increases due to the use of an optical filter.

In addition, narrowing the band of the remote control receiver increases the number of parts, improves adjustment accuracy, and improves the frequency accuracy of the remote control transmitter, which not only increases costs but also increases the number of defective factors. Was.

In view of the above problems, the present invention provides a remote control device that can prevent remote control malfunctions.

Means for Solving the Problems In order to solve the above problems, the remote control device of the present invention is provided with means for determining the presence or absence of a predetermined number or more of pulses in a remote control signal composed of a predetermined number of pits. If there are more than a few pulses, it is determined that an interference signal has been input and the remote control circuit is reset.

Effect of the present invention With the above-described configuration, the number of pulses of the remote control signal generated from the remote control transmitter is calculated by a microcomputer, etc.
If an interference signal is input, it can be determined that more pulses than necessary have been input. As a result, remote control signals containing interference signals are not decoded, thereby preventing malfunctions. In terms of configuration, this can be handled using microcomputer software, so there is no cost increase.

EMBODIMENT A remote control device according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of a remote control device in one embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a remote control receiving section that converts an infrared remote control signal into an electrical signal. 2 is a remote control transmitter that generates an infrared remote control signal. 3
is a microcomputer equipped with two input sections for remote control signals. 4 is a remote control receiving section 1. This is a remote control receiving device in a television receiver that includes a microcomputer 3.

The operation of the remote control receiving device configured as described above will be described below with reference to FIGS. 1 and 2.

First, a signal shown by a solid line in FIG. 2 is input from the remote control transmitter 2 to the remote control receiver 1 and converted into an electrical signal. This signal consists of a head pulse indicating the beginning of the signal, a -10'' pulse indicating the content, a B pulse, and a C pulse Tt1''. In this example, the total number of “o” and Itl pulses indicating the content is 2.
The judgment of 11'f and "o" is that if the period of C is 1.6 fi seconds or more, it is a crane 1'', and the period of B is 1.6 fi seconds.
If it is less than 67F1 second, it is '0'. When the interference signal shown by the broken line D is input to the receiver 1, the interference signal (t 1
The ``pulse'' becomes E's ttO'' pulse and G's 11'' pulse.If this continues, the 22nd pulse after the head pulse person
The contents of each signal will change. Therefore, in this example,
Normally, the 22nd pulse of G is used, and if an interference signal is input, the 22nd pulse becomes the 23rd pulse, so the microcomputer
When the 23rd pulse is detected, the previous 22 pulses are not decoded. Therefore, no malfunction occurs at this time. The monitoring time is 1 after 22 pulses become “1” from It i,, It.
．． It is between 35 fi seconds and 3.5 seconds.

A functional block diagram of the above microcomputer is shown in FIG. The functional block includes a memory control means 11, which writes data on channel selection and volume to or reads data from a memory (not shown). The display signal generating means 12 displays the status of the television receiver on the screen. The tuning circuit control means 13 controls the reception band and frequency of the tuner.

These have the functions of a normal microcomputer, but
In order to do this, the content of the remote control signal is determined by the remote control signal determining means 14 in the preceding stage, and the control signal generating means 15 is passed through the control signal generating means 15 to perform each of the above-mentioned controls accordingly. In this example, such a function is provided with means 16 for determining the presence or absence of the 23rd bit pulse, and reset means 1.
When the 23rd bit pulse is inputted as a result of an interference signal or the like, the 23rd bit pulse presence/absence determining means 16 outputs an output to operate the reset means 17 and cancel the operation of the microcomputer.

As described above, according to this embodiment, in addition to the means for determining the remote control signal, since the remote control signal is originally sent in 22 bits, a function for determining the 23rd bit signal is provided, and if there is a 23rd bit signal, By resetting the remote control signal, malfunctions can be reliably prevented.

Effects of the Invention As described above, according to the present invention, malfunctions can be prevented by determining that a remote control signal has been affected by an interference signal, and its practical effects are significant.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a remote control device in an embodiment of the present invention, Fig. 2 is a waveform diagram of a remote control signal, and Fig. 3 is a waveform diagram of a remote control signal.
The figure is a functional block diagram of the main parts of the remote control device, and FIG. 4 is a configuration diagram of a conventional remote control receiving device. 1...Remote control receiver (ii, 2...
...Remote control transmission Ma, 3...
Microcomputer equipped with two remote control signal input sections, 4...Remote control receiver, 16...23rd bit pulse presence/absence determination means, 17...Reset Means, mu...
...Head pulse, B...lIO" pulse, C
......"1" pulse, D......interference signal,
E: ``0'' pulse generated by the interference signal,
F... ``1'' pulse generated by the interference signal,
G: 22nd pulse of the remote control signal under normal conditions without interference. Name of agent: Patent attorney Toshio Nakao and one other personQ -
--'Which pulse D-11 disturbance A is generated from the signal E-1-d signal f? t'') Gurus F-m-interference signal l;

Claims (1)

[Claims] A receiving means for receiving a remote control signal composed of a predetermined number of bits, and a discriminating means for determining whether or not the remote control signal is greater than or equal to the predetermined number of bits are provided, The remote control device is configured to reset the remote control circuit by the output of the discrimination means when the number exceeds the number.