JPS61177848A - Data transmission and reception in infrared remote controller - Google Patents

Abstract

PURPOSE:To prevent an infrared ray due to an exogenous parameter from being fetched as a data signal by discriminating whether or not a received signal is from a remote controller prior to fetching the data signal. CONSTITUTION:The discrimination is made whether or not a signal from the remote controller 1 is received. When it is received, contents of a judgement checking signal are compared with those of a set code. If they are equal, a data code with respect to the data signal is fetched. Where the fetched data is correct, the number of data fetching times is counted. If it is one, a moved member 5 is operated to lock a door. When it is not one, the door is opened. If the fetched data is not correct, the number of fetching times is discriminated. When it exceeds the set number of times, the set time is locked to stop the fetching of data only during the set time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a data transmission/reception system in an infrared remote control device used for locking or unlocking doors of automobiles or hotels, for example.

(Summary of the Invention) The present invention provides, in order to prevent a driven member operated by an infrared remote control device from being operated unexpectedly due to external disturbance, to
Prior to capturing a data signal, it is attempted to determine whether the received signal is from a remote control device.

(Prior art and its problems) In this type of conventional transmission/reception system, a remote control device transmits a data signal as an infrared signal, and the receiving means receives and captures the transmitted data signal. There is.

By the way, it is known that, for example, fluorescent lamps and the like generate infrared rays at the zero-crossing points of their commercial power frequency, and wireless devices and the like generate infrared rays at the zero-crossing points of their external radio wave frequencies.

However, in the case of the conventional example, the receiving means receives infrared rays caused by the above-mentioned commercial power supply or external radio waves, and always takes in the infrared rays as a data signal. Therefore, the infrared rays caused by the disturbance coincidentally coincide with the infrared transmission signal from the remote control device,
There is a drawback that the driven member connected to the receiving means may be activated unexpectedly.

(Purpose of the Invention) The present invention has been made in view of the above circumstances, and an object of the present invention is to focus on the frequency characteristics of disturbances and to prevent infrared rays caused by disturbances from being captured as data signals. do.

(Structure and Effects of the Invention) 1. In order to achieve the above object, the present invention provides a remote control device that has a frequency longer than a half-wavelength cycle of an external radio wave frequency and a half-wavelength cycle of a commercial power frequency. A judgment check for determining whether or not the receiving means side can be activated by combining a first signal containing a predetermined number of pulses within a short set cycle and a second signal containing fewer than the predetermined number of pulses within the set cycle. While transmitting the signal and the data signal as an infrared signal, the receiving means side transmits the first. Second
Built-in check data is binarized by setting one of the signals to logic rlJ and the other to logic "0", and comparing the contents of the judgment check signal among the received infrared transmission signals with the contents of the check data, The device is characterized in that when the two match, it is determined that activation is possible and the data signal is taken in.

Focusing on the frequency characteristics of the disturbance, for example, assuming that the first signal is a logic "1" and the second signal is a logic "0", as shown in FIG. Contains check data for In response, the remote control device transmits a first signal and a second signal corresponding to the check data.

On the other hand, in the case of the commercial power supply frequency, as shown in Fig. 5 (a), the half-wavelength period t is longer than the set period of the pulse, and accordingly, as shown in Fig. 5 (b), , the period L+ of the infrared rays generated at the zero cross point also becomes longer,
When binarized on the receiving means side, (0, 0, 0, 0)
Therefore, it does not match the check data and the data signal is not captured. Furthermore, in the case of an external radio wave frequency, as shown in FIG. When binarized with (1
, 1, 1, 1), which does not match the check data, and the data signal is not captured as in the previous case.

Therefore, even if infrared rays due to a disturbance are received by the receiving means, data signal acquisition does not start, and it is possible to effectively avoid the driven member being operated by the disturbance, and the gutter is not unlocked unexpectedly. This has made it possible to prevent incidents such as theft.

(Description of Examples) Hereinafter, the present invention will be described in detail based on examples shown in the drawings. FIG. 1 is a circuit block diagram of an embodiment of the data transmission/reception system of the present invention.

1 is an infrared remote control device, 2 is a light receiving part on the receiving means side, 3 is a control circuit, 4 is a driver, and 5 is a driven member operated by the remote control device 1 to lock or unlock the door. For example, it consists of a solenoid, a door lock motor, etc.

In the remote control device 1, a first signal including a predetermined number of pulses within a set period T that is longer than a half-wavelength period of an external radio wave frequency and shorter than a half-wavelength period of a commercial power frequency; The device is configured to transmit a judgment check signal and a data signal for determining whether or not the receiving means can start up as an infrared signal by combining a second signal containing pulses less than the predetermined number within T.

The control circuit 3 includes a binarization means 6 which binarizes the first signal as logic rLJ and the second signal as logic "0", and a code obtained by binarizing the judgment check signal and pre-built-in check data. a comparison means 7 for comparing the check code and the setting code; a storage means 8 for storing the data code obtained by binarizing the data signal; data importing means 9 for importing the data; and data correctness determining means l for determining whether the imported data is correct.
It is equipped with O.

FIG. 2 is a configuration diagram of a signal code built into the receiving means side, and this signal code takes in a setting code C1 as a check for the judgment check signal and a data code for the data signal. A fixed code C1 such as a bit, and a conversion code C3 for performing a predetermined conversion process on the fixed code C1 and comparing it with a data setting code when the contents of the fixed code Ct are correct and checking against the data signal. There is. The conversion code c
3 constitutes the data correctness determination means (so-called parity check).

As shown in FIG. 3, the first signal includes two pulses within a set period (for example, 2m5), and the second signal includes one pulse. are set for each signal.

When this first signal is binarized, the logic rlJ, on the other hand,
When the second signal is binarized, it becomes a logic rOJ, and by combining these, when the judgment check signal is binarized, for example, a check code of (1, 0, 1, O) is generated. is now available.

Next, the operation of this embodiment will be explained using the flowchart shown in FIG.

First, it is determined whether a transmission signal from remote control device l has been received (F'l). If received,
It is compared and determined whether the check code for the determination check signal and the setting code as check data match (F2). Here, if it is determined that they match, the data code for the data signal is fetched (F3).

Next, it is determined whether the imported data is correct (F4), and if it is correct, the number of times the data has been imported is counted (F5), and it is further determined whether the number of times the data has been imported is one (F6). If it is once, a control signal for locking the door is output (F7), and the driven member 5 is operated to lock the door. If it is not once, then it is determined that it is twice, and a control signal for unlocking the door is output (F8), and the driven member 5 is operated to unlock the door.

In step F4, if it is determined that the imported data is incorrect, the number of times the data is imported is equal to the set number of times (
N times (for example, 10 times) or more is determined (F9). If it is less than the set number of times, the counted number of times is added once (FIO) and the process returns to step Fl. If the set number of times is exceeded, the set time will be time-locked (F
11→F12).

As a result, regardless of signal reception by the receiving means,
Data import is stopped for 1f for the set time.

Then, after the set time has passed, set the count to 0 (F13
) and return to step Fl.

In the above embodiment, the first signal is the logic rlJ and the second signal is the logic "0", but in the present invention, the first signal may be the logic "0" and the second signal may be the logic "1".

[Brief explanation of the drawing]

Fig. 1 is a circuit block diagram of an embodiment of the data transmission/reception system of the present invention, Fig. 2 is a configuration diagram of a signal code, Fig. 3 is an explanatory diagram of binarization of a judgment check signal, and Fig. 4 is a flowchart. , FIG. 5 is an explanatory diagram of the commercial power supply frequency, and FIG. 6 is an explanatory diagram of the external radio wave frequency. 1...Remote control device.

Claims (1)

[Claims] (1) In a remote control device, a first signal including a predetermined number of pulses within a set cycle that is longer than a half-wavelength cycle of an external radio wave frequency and shorter than a half-wavelength cycle of a commercial power frequency; a second signal containing pulses less than the predetermined number within the infrared ray signal, and transmits a judgment check signal and a data signal for determining whether or not the receiving means can start up as an infrared signal; , among the first and second signals,
It has built-in check data that is binary-coded with one as a logic "1" and the other as a logic "0", and the contents of the judgment check signal among the received infrared transmission signals are compared with the contents of the check data, and both are checked. 1. A data transmission/reception method in an infrared remote control device, characterized in that when a match occurs, the data signal is determined to be activated and is taken in.