JPH0511709B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a digital remote control device, and particularly to one that transmits data in a signal format having an end pulse indicating the end of transmitted data.

[Conventional technology]

A second general remote control system
As shown in the figure. In FIG. 2, 1 is a transmission circuit for modulating a transmission code at a specific frequency and transmitting it;
2 is a receiving circuit that processes the received signal; 3 is a light emitting section made of a light emitting element such as a light emitting diode that receives the output of the transmitting circuit 2; and 4 is a receiving circuit that receives the optical signal a from the light emitting section 3 and outputs the output. This is a light-receiving section consisting of a light-receiving element such as a photodiode.

FIG. 3 is a waveform diagram showing pulse intervals corresponding to information "0" and "1", in which numerals 5 and 6 are pulse intervals corresponding to "0" and "1", respectively.

FIG. 4 is a waveform diagram showing a conventional transmission code format. In the figure, 8 and 9 are custom code and instruction code, respectively, and 7 is custom code 8,
Word (word) of the transmission code consisting of instruction code 9, 12 is the repetition period of the transmission code.

Next, the operation will be explained.

In the remote control system configured as shown in FIG. 2, first, the transmission circuit 1 encodes and modulates information to be sent, and the light emitting section 3 converts it into an optical signal a and transmits it. Next, the transmitted optical signal a is received by the light receiving section 4, demodulated by the receiving circuit 2, and the command is decoded.

In a remote control system with such a configuration and function, the distinction between information "0" and "1" is made by two consecutive This is done by a pulse interval of two pulses. That is, in this FIG. 3, the short pulse interval 5 shown in FIG. 3a is "0", and the long pulse interval 6 shown in FIG. 3b is "1".
corresponds to each.

These "0" and "1" are combined into one word 7 in the transmission code format shown in Figure 4, and the type of instruction is distinguished according to the data code of this word 7. This method is adopted. Further, in order to avoid interference with other remote control systems, some bits of the transmission code are assigned to the custom code 8, and the remaining bits are assigned to the instruction code 9. For example, if 3 bits of a 10-bit transmission code are custom code and 7 bits are instruction code, there are 8 (=2 ³ ) independent types of instructions with 128 (= 2 ⁷ ) instructions per system. System can be configured. In addition, in FIG. 4, 12 indicates the repetition period of the transmission code.

When the transmitting side transmits a transmission code as shown in FIG. 4, the receiving side first decodes the custom code part of the received code, and then decodes the instruction code part. If the decoded custom code matches the code given to your system, it will cause the controlled object to execute the command.

[Problem that the invention seeks to solve]

Conventional digital remote control systems are configured as described above, so if a certain key is held down and the same transmission code is continuously issued, an obstacle passes through the transmission path of optical signal a. If optical signal a is temporarily interrupted due to reasons such as
If the receiving side receives the same code more than once, it cannot distinguish whether the same key was pressed multiple times or whether the key was kept pressed and the optical signal a was temporarily interrupted. Therefore, there was a problem that the device malfunctioned.

This invention was made to solve the above-mentioned problems. When the receiving side receives the same instruction code in succession, it determines whether the key is being pressed continuously or whether the same key has been pressed multiple times. The purpose is to obtain a digital remote control device that can detect.

[Means for solving problems]

The digital remote control device according to the present invention generates, on the transmitting side, an identification pulse signal whose pulse width is changed according to the number of times an input key is pressed, and combines this identification pulse signal with a processing command. A transmission signal consisting of a transmission code signal indicating the above is repeatedly transmitted at a fixed period while the input key is pressed, and on the receiving side, the transmission signal is repeatedly transmitted at a fixed period from the transmitting means. The above transmission signal consisting of a code signal and an identification pulse signal is received, and the pulse widths of the previously received identification pulse signal and the currently received identification pulse signal are compared, and if the comparison results are the same, the currently received identification pulse signal is The present invention is configured such that, if the above comparison results are different, an instruction is given to execute processing based on the transmission code signal for the currently received identification pulse signal. .

[Effect]

In this invention, the pulse width of the end pulse is changed on the transmitting side according to the number of transmission operations, and the receiving side can read the number of transmission operations from the pulse width of the received end pulse. By comparing the number of transmission operations read from the previously received code, it is possible to detect whether the key is being pressed continuously or pressed again when the same command code is received continuously. Become.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a waveform diagram of a transmission signal showing the transmission format of a digital remote control device according to an embodiment of the present invention. In the figure, 8 and 9 are a custom code and an instruction code, respectively, and 7 is this custom code 8 and Words of the transmission code consisting of code 9, 11a, 11b, and 11c are end pulses having information on the number of transmission operations, and 12 is the repetition period of the transmission code.

The block configuration of the device of this embodiment is the same as that of the conventional device shown in Fig. 2, and the transmitting circuit on the transmitting side includes a 1-bit or multiple-bit counter that counts the number of times a transmitting operation such as pressing an input key is performed. (counting means) and pulse width setting means for changing the pulse width of the end pulse so as to correspond one-to-one to this count value.

Next, the operation will be explained. On the sending side,
Counting the number of times the same key is pressed using a one-bit or multiple-bit counter, generating an end pulse with a pulse width that corresponds one-to-one to the counted value,
This end pulse is transmitted after custom code 8 and instruction code 9.

For example, in the example shown in FIG.
1 → 2... and correspondingly, the end pulses 11a → 11b → 11c → 11a → 1
1b... is transmitted.

On the receiving side, custom code 8, instruction code 9, end pulse 11a or 11b or 11
If custom code 8 matches the custom code assigned to you, and the end pulse waveform (pulse width)
If it is different from the one received earlier, it is determined that the same key has been pressed multiple times, and the control target executes the command. If the waveform of the end pulse is the same as that previously received, it is assumed that the same key has not been pressed multiple times, and the command is not executed.

In addition, in the above embodiment, an example was shown in which the number of transmission operations is classified into three states, but this may be set in any manner as long as it is plural.

Further, although the instruction code and the end pulse are placed at temporally distant positions, they may be placed temporally close to each other.

In addition, in the above embodiment, if the waveform (pulse width) of the end pulse received this time is the same as the waveform of the end pulse received last time, the command is not executed. The condition may be changed to such that the command is not executed if the pulse widths of the pulses are both equal to the pulse widths of the previously received command code and end pulse.

〔Effect of the invention〕

As described above, according to the digital remote control device of the present invention, each time an input key is pressed, an identification pulse signal whose pulse width is changed according to the number of times the input key is pressed is generated, and this identification pulse signal and a transmission code signal indicative of a processing command, the transmitter repeatedly transmits a transmission signal at a constant cycle while an input key is pressed; The above transmission signal consisting of a transmission code signal and an identification pulse signal is received, and the pulse widths of the previously received identification pulse signal and the currently received identification pulse signal are compared, and if the comparison results are the same, the currently received identification pulse signal is received. and a receiving section that does not instruct execution of processing based on the transmission code signal for the pulse signal, but instructs execution of processing based on the transmission code signal for the currently received identification pulse signal if the comparison results are different. This has the effect that when the same command code is received, it is possible to determine whether the same key was pressed multiple times or whether the transmitted signal was temporarily interrupted while the key was being pressed. be.

[Brief explanation of the drawing]

FIG. 1 is a waveform diagram showing the transmission format of a digital remote control device according to an embodiment of the present invention, FIG. 2 is a system diagram of a general remote control system, and FIG. 3 is a diagram showing information "0",
Waveform diagram showing pulse intervals corresponding to "1", 4th
The figure is a waveform diagram showing a conventional transmission format. 1... Transmission circuit, 2... Receiving circuit, 3... Light emitting section, 4... Light receiving section, a... Optical signal, 5... Pulse interval corresponding to information "0", 6... Information "1"
7...Transmission code word, 8...Custom code, 9...Instruction code,
11a, 11b, 11c...end pulse, 12
...Repeated cycle. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] 1. Every time an input key is pressed, an identification pulse signal is generated whose pulse width is changed according to the number of times the input key is pressed, and this identification pulse signal and a transmission code signal indicating a processing command are generated. a transmitting means for repeatedly transmitting a transmission signal consisting of the following at a constant cycle while an input key is pressed; and a transmission code signal and an identification pulse signal repeatedly transmitted at a constant cycle from the transmitting means. The above transmission signal is received, and the pulse widths of the previously received identification pulse signal and the currently received identification pulse signal are compared, and if the comparison results are the same, processing is performed on the currently received identification pulse signal based on the transmission code signal. A digital remote control device, characterized in that it is equipped with a receiving means that instructs to execute a process based on a transmission code signal for the currently received identification pulse signal if the comparison result is different. .