JP2511887B2 - Digital remote control transmission device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a digital remote control transmission device, and more particularly to improvement of its transmission system.

[Conventional technology]

Generally, the block configuration of a digital remote control system is as shown in FIG. In FIG.
Reference numeral 31 is a transmitting circuit, 32 is a receiving circuit, 33 is a light emitting diode or another light emitting element, and 34 is a photodiode or another light receiving element.

In FIG. 3, first, information to be transmitted is transmitted by the transmission circuit 31.
Is encoded and modulated by the light emitting diode 33, and the light signal is transmitted by the light emitting diode 33. The transmitted optical signal is received by the photodiode 34, demodulated by the receiving circuit 32, and the instruction is decoded.

FIG. 4 shows a transmission method already developed by the applicant of the present invention in the transmission method of this type of system, and the distinction between 1-bit information “0” and “1” is continuous 2 as shown in FIG.
It is performed by the time interval of one pulse. That is, the fourth
In the figure, the pulse interval, that is, the shorter time from the pulse rise to the next pulse rise (41 in Fig. 4) is the bit "0", and the longer one (42 in Fig. 4) is the bit "1". ", Respectively. These bits "0" and "1" are combined as shown in FIG. 5 to form one word (word:
The type of instruction is distinguished according to the data code of this word. In the example of FIG. 5, one word has an 8-bit structure.

[Problems to be solved by the invention]

However, with this transmission method, the word length may be shortened depending on the number of "0" s (or "1" s) in one word. Therefore, the receiving side does not know the length of one word, which makes it difficult to decode the data.

In order to avoid interference between the digital remote control systems, for example, in the conventional example of FIG. 5, the first 4 bits in word 5 are the custom code 2 indicating the type of digital remote control system, and the next 4 bits. Is used as an instruction code 3, and a method of distinguishing the system type by a custom code is used. The fifth
Reference numeral 6 in the figure indicates a repeating cycle.

However, in the field of this kind, remote control devices having various bit configurations are currently in practical use, and different systems happen to be similar in judgment criteria of “0” and “1”, and one word of If the numbers of bits are the same, there is a drawback that interference may occur between the two systems and the system may not be used as a remote control device.

In view of such problems of the present invention, it is made,
An object of the present invention is to provide a digital remote control transmission device in which the length of one word is constant and many independent digital remote systems can be adopted.

[Means for solving problems]

A digital remote control transmission device according to the present invention is provided with a sync pulse train having a constant period, a data pulse is inserted between the sync pulses, and 1-bit information “0”, “1” is distinguished from the sync pulse by the sync pulse train. This is performed according to the time interval with the data pulse, and further, a period obtained by combining a period without a data pulse and a period with two or more data pulses is provided between the custom code and the instruction code.

[Action]

In the present invention, the data pulse is inserted between the sync pulse trains having a constant cycle, and "0" and "1" of each bit are distinguished by the time interval between the sync pulse and the data pulse.
Further, a period without data pulse and a period with two or more data pulses are provided between the custom code and the instruction code, and the combination of these periods enables identification between the remote control systems. With a fixed length, data can be easily decoded, interference between remote control systems can be reduced, and many independent remote control systems can be used.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a transmission system in a digital remote control transmission device according to an embodiment of the present invention. In the figure, 21 is a synchronization pulse, 22 is a data pulse, 1 is a 1-bit period, 2 is a custom code, 3 is data. Code (instruction code), 4 is a separation period for separating the custom code and the instruction code, 5 is one word of the transmission code, and 6 is a repeating cycle.

In the present embodiment, the distinction between the bits "0" and "1" is that, as shown in FIG. 2, the period 23 or 25 from the rising edge to the falling edge (or from the falling edge to the falling edge) of the sync pulse and the next data pulse 22 is 1 ms
It is assumed to be "0" at "0" and "1" at 2ms. The cycle of the sync pulse is 3 ms.

In the embodiment shown in FIG. 1, a 4-bit custom code 2
("1001" in the example of FIG. 1) is transmitted first, and then a separation period 4 for separating the custom code and the instruction code is transmitted, and further, a 5-bit instruction code 3 (in the example of FIG. 1, " 01001 ") is transmitted.

In this case, 1 if the transmission code 5 has the same number of bits.
The word length is always "0" (or "1") of the data regardless of the number when the pulse width of the sync pulse is 0.5ms.
It is constant at 36.5ms (= 3ms x 12 + 0.5ms).

Further, since the transmission code 5 is divided into the custom code 2 and the instruction code 3, and the period 4 indicating the boundary is provided,
Even if the total number of bits of the transmission code is the same, if the bit numbers of the custom code 2 and the instruction code 3 are changed, a code system that does not interfere with each other can be created.
That is, many code systems can be created with the transmission code having the same number of bits.

Further, the period indicating the boundary between the custom code 2 and the instruction code 3 is constituted by the combination of the period (A) and the period (B) provided with two data pulses, so that the period (A) , (B), a coating system which does not interfere with each other can be obtained.

In the example of FIG. 1, it is "ABA", and if the period 4 is 3 bits, 8 types of code systems can be created only by the period 4. Since this period 4 can be extended as necessary, more code systems that do not interfere with each other can be created.

In the above embodiment, the period of the sync pulse example is defined as 3 ms, the rise time of the sync pulse and data pulse corresponding to bit “0” is defined as 1 ms, and bit “1” is defined as 2 ms. If you can distinguish between "1" and "1", you can freely change it according to the purpose.

Further, in the above-described embodiment, the period 4 for separating the custom code 2 and the instruction code 3 is set to be only three cycles of the sync pulse, but it may be set to two or more cycles depending on the purpose.

Further, the period 4 is a combination of the internal period (A) of the data pulse and the two periods (B) of the data pulse, but the number of the data pulse of the period B can be selected to be 2 or more as needed. .

The combination of the periods A and B is not limited to ABA, and can be arbitrarily changed as needed.

In addition, in order to improve the noise resistance of the transmission system, the synchronization pulse and the data pulse are set to a specific frequency (for example, 38 kH
z) may be used for modulation to narrow the frequency band for transmission.

Further, a read pulse having a long pulse width may be inserted before the transmission code in order to make it easy for the receiving side to know that the transmission signal has arrived.

Further, by making the pulse widths of the synchronization pulse 21 and the data pulse 22 different, it is possible to easily distinguish the two pulses on the receiving side.

Further, the custom code 2 and the instruction code may have different numbers of bits, so that the receiving side can easily distinguish between them.

Further, in the above embodiment, the custom code 2 is transmitted first,
Although the instruction code 3 is transmitted later, the instruction code 3 may be transmitted first.

〔The invention's effect〕

As described above, according to the digital remote control transmission device of the present invention, in the data transmission of the remote control, the length of one word is constant, the interference between the remote control systems is reduced, and the independent remote control is performed. Since many systems can be taken, the practical effect is extremely large.

[Brief description of drawings]

FIG. 1 is a diagram showing a code configuration of a remote control transmission device according to an embodiment of the present invention, FIG. 2 is a diagram showing a distinction between bits “0” and “1”, and FIG. 3 is a diagram showing a remote control system. FIG. 4 is a schematic block diagram showing a conventional remote control transmission system. In the figure, 21 is a sync pulse, 22 is a data pulse, 1 is a 1-bit period, 2 is a custom code, 3 is a data code (instruction code), 4 is a separation period, 5 is a word, and 6 is a repeating cycle. .

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Daisuke Shichinohe, 4-chome, Mizuhara, Itami-shi, Hyogo Prefecture, Mitsubishi Electric Corporation Kita-Itami Works (72) Masako Hiroma 4-chome, Mizuhara, Itami-shi, Hyogo Mitsubishi Electric Machine Kita Itami Works (56) References JP-A-60-227547 (JP, A)

Claims (5)

(57) [Claims] 1. A synchronous pulse train having a constant cycle and a data pulse inserted between the synchronous pulses,
In a digital remote control transmission device for transmitting a transmission code having a predetermined number of bits in which bit information “0” and “1” are distinguished by a time interval between the synchronization pulse and the data pulse, the transmission code is different. The custom code consists of a custom code for avoiding interference between remote control systems and an instruction code for the controlled object, and consists of a period in which no data pulse is inserted between the sync pulse trains and a period in which at least two data pulses are inserted. A digital remote control transmission device, characterized in that a separation period is provided for separating the instruction code and the instruction code. 2. The synchronization pulse and the data pulse have different pulse widths from each other.
The digital remote control transmission device according to the item. 3. The digital remote control transmission device according to claim 1, wherein the synchronizing pulse and the data pulse are modulated at a specific frequency. 4. The custom code and the instruction code are different in the number of bits thereof.
The digital remote control transmission device according to the item. 5. The interference between digital remote control systems is avoided by combining a period in which no pulse is inserted between the custom code and the instruction code and a period in which at least two pulses are inserted. The digital remote control transmission device according to claim 1.