JPH0473920B2 - - 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 performs transmission in a signal format having an end pulse indicating the end of transmitted data.

[Prior Art] Fig. 3 shows a block configuration of a general digital remote control system. In Fig. 3, 31 is a transmitting circuit, 32 is a receiving circuit, 33 is a light emitting diode or other emitting element, and 34 is a photo-emitting element. A diode or other light receiving element.

In such a system, the information to be sent is first encoded and modulated by the transmission circuit 31, and then converted into an optical signal by the light emitting diode 33 and transmitted. The transmitted optical signal is transferred to a photodiode 34.
The receiving circuit 32 demodulates the light and decodes the command.

FIG. 4 shows an example of the configuration of a transmission code for a digital remote control device already developed by the applicant of the present invention. In the figure, 21 is a synchronization pulse of a constant period, 22 is a data pulse, 1 is a period of 1 bit, 2 is a custom code for distinguishing between remote control devices, 3 is a data code (command code) encoding a command, 5 is one word of a transmission code, and 6 is a repetition period.

The distinction between bits "0" and "1" is from the rising edge of a synchronizing pulse to the rising edge of the next data pulse (or from the falling edge of a sync pulse to the rising edge of the next data pulse), as shown in Figure 5. “0” (5th
It is set to "1" at 2 ms (Fig. 5 b).
Therefore, the period of synchronization pulse 1 is 3ms.

On the transmitting side of such a conventional device, the 5-bit custom code 2 (“10010” in the example in Figure 4) is first transmitted, and then the 6-bit data code 3 (the 4th one) is transmitted.
In the example shown in the figure, "110011") is transmitted.

On the other hand, on the receiving side, first the custom code part of the received code is decoded, and then the data code part is decoded. If the decoded custom code matches the code given to its own system, it transmits the command of the decoded data code to the controlled unit.

[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 receiving side pressed the key again or whether the key was kept pressed and optical signal a was temporarily interrupted. I had a problem with it malfunctioning.

This invention was made to solve the above-mentioned problems, and it is a digital remote that can detect whether a key is being pressed continuously or if it is pressed again when the same command code is received continuously on the receiving side. The purpose is to obtain a control device.

[Means for solving problems]

The digital remote control device according to the present invention counts the number of times transmission operations such as key presses are performed on the transmission side, and changes the configuration of an end code indicating the end of the transmission code to multiple pieces of data between synchronization pulses. The code has a code structure that combines pulse trains with different configurations from bits indicating control information "0" and "1", expressing two types of information depending on whether a pulse is inserted or a data pulse is not inserted. In addition, the number of pulse trains constituting this end code or the combination of the arrangement of pulse trains constituting this end code are arranged to indicate a value corresponding to this counted value.

[Effect]

In this invention, the code structure of the end code is changed on the sending side according to the number of sending operations, and the receiving side can read the number of sending operations from the code structure of the received end code. 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 instruction code is received continuously. becomes. Furthermore, since the end code is made up of bits different from those indicating "0" and "1", the end code can be easily identified.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the configuration of a transmission code of a digital remote control device according to an embodiment of the present invention. In the figure, 21 is a synchronizing pulse, 22
is the data pulse, 1 is the period of 1 bit, 2 is the custom code, 3 is the data code (instruction code),
4a, 4b, and 4c indicate the end of the transmission code and have information on the number of key operations on the transmitting side; 5 is one word of the transmission code; and 6 is the repetition period.

FIG. 2 shows the structures of two types of pulse trains that make up the end code. FIG. 2a shows an example in which there is no pulse between the synchronizing pulses, and FIG. 2b shows an example in which two pulses are inserted between the synchronizing pulses.

The block configuration of the device of this embodiment is the same as that of the conventional device shown in FIG. 3, but the transmitting circuit on the transmitting side contains a one-bit or multiple-bit bit that counts the number of times a transmitting operation such as pressing an input key is performed. A counter (counting means) and an end pulse generation circuit that changes the code structure of the end code in one-to-one correspondence with the counted value are provided.

Also, within the receiving circuit on the receiving side, there is a means for reading the number of transmission operations from the code structure of the end pulse, a means for latching the number of transmission operations read last time, and a means for comparing the number of previous readings with the current one. and means for controlling execution of the decoded instruction in accordance with the comparison result.

Next, the operation will be explained. On the sending side,
Count the number of times the key is pressed again using a one-bit or multiple-bit counter, generate an end code with a code structure that corresponds one-to-one to the counted value,
This end code is sent after custom code 2 and data code 3.

For example, in the example shown in FIG.
Count 1 → 2..., and correspondingly, the end code, 4a → 4b → 4c → 4a → 4b...
Send.

On the receiving side, custom code 2, data code 3, and end code 4a or 4b or 4c are received and decoded, and if custom code 2 matches the custom code assigned to you and the end code is If the configuration is different from the one received earlier, it is assumed that the key was pressed again, and
Make the controlled object execute the command. If the code structure of the end code is the same as the one received earlier, the command is not executed, assuming that the key is not pressed again.

Note that since the configuration of the pulse train constituting the end code is different from the configuration of the bits indicating "0" and "1", the receiving side can easily distinguish between the custom code, data code, and end code.

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

Further, in the above embodiment, the end code has the same number of bits (three bits in the example), but the number of bits may be changed depending on the number of key operations. In this case, the end code may consist only of bits without data pulses between synchronization pulses (Figure 2a) or bits with multiple data pulses inserted between synchronization pulses (Figure 2b). .

In addition, in the above embodiment, if the code structure of the end code received this time is the same as the code structure of the end code received last time, the instruction is not executed. The condition may be such that the instruction is not executed if the code structure of the code is the same as the code structure of the previously received data code and end code.

Further, in the above embodiment, the transmission code is directly converted into infrared rays, but the synchronization pulse and the data pulse may be modulated at a predetermined frequency, and the same effect as in the above embodiment can be obtained.

〔Effect of the invention〕

As described above, according to the digital remote control device according to the present invention, the number of transmission operations such as pressing a key is counted on the transmitting side, and the configuration of the end code indicating the end of the transmission code is synchronized. A pulse train with a different configuration from the bits that indicate control information “0” and “1”, in which two types of information are expressed depending on whether multiple data pulses are inserted between pulses or no data pulse is inserted. At the same time, the number of pulse trains that make up this end code or the combination of the arrangement of pulse trains that make up this end code indicates a value that corresponds to this counted value. It is possible to know the number of times the transmission operation has been performed, and when the same data code is received, it has the advantage of being able to determine whether the key is being pressed continuously or whether it is being pressed again.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of a transmission code of a digital remote control device according to an embodiment of the present invention, Figure 2 is a diagram showing the bit configuration of two types of bits that make up the end code, and Figure 3 is a diagram of a general remote control. Control system block diagram, 4th
This figure is a diagram showing the configuration of a transmission code of a conventional digital remote control device, and FIG. 5 is a diagram showing the bit configuration of bits indicating "0" and "1". 1... 1 bit period, 2... Custom code, 3... Data code, 4a, 4b, 4c...
End code, 5...1 word of transmission code, 6
...Repetition period, 21...Synchronization pulse, 22...
...Data pulse, 23-26...Pulse interval of synchronization pulse/data pulse, 31...Transmission circuit, 3
2... Receiving circuit, 33... Light emitting diode, 34
...Photodiode. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. A transmission data code consisting of a custom code for distinguishing between controlled devices, an instruction code for operating the controlled device, etc. is transmitted, and each bit of the custom code and instruction code is transmitted at a fixed period. Information “1” or “0” depending on the position of one data pulse inserted between each sync pulse of
In a digital remote control device that transmits control information in a data code format in which The code has a code structure in which an end code indicating the end of the transmission data code is arranged next to the code, and the end code has a plurality of data pulses inserted between each of the synchronization pulses, or a data pulse is inserted. The end code is composed of pulse trains that express two types of information depending on whether the Features a digital remote control device. 2. The digital remote control device according to claim 1, wherein the synchronization pulse has a pulse width different from that of the data pulse. 3. The digital remote control device according to claim 1 or 2, wherein the synchronization pulse and the data pulse are modulated at a predetermined frequency.