JPH0646484A - Remote control transmitter - Google Patents

Abstract

PURPOSE:To cope with various kinds of transmission signals and to make a low cost possible by reading out specified key operation code and identification code sequentially by the progression of a sequence counter according to procedure set in advance in sequence memory. CONSTITUTION:Key data scanned by a key scan circuit 12 and in accordance with an operated key switch is outputted from a key decoder 13, and it is fetched in a data register 14, and the output data of the data register 14 is set as the address data of identification/equipment operation memory 15. The sequence memory 16 is memory to decide the delivery order of the data specified (addressed) in the identification/equipment operation code memory 15, and the format of the transmission signal is stored in it in advance, and the address (deliver order) is designated by the output of the sequence counter 17. A sequence code, i.e., the format of the transmission signal to be written on the sequence memory 17 can be set freely, which is able to respond to the various kinds of transmission signals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote control transmitter for controlling a television receiver, an air conditioner and the like by utilizing an infrared ray system, a radio wave system or the like.

[0002]

2. Description of the Related Art For example, as a remote control transmission IC using an infrared method, NEC μPD6123, Mitsubishi M
As represented by 50560, as shown in FIG. 3 showing a schematic block, a microcomputer 1 is mounted,
The device operation code corresponding to the key input of the key matrix 2 and the device or manufacturer identification code set in the mask ROM 3 are read from the mask ROM 3 and sequentially output in a predetermined transmission signal format by the processing of the microcomputer 1. ing. Reference numeral 4 is a key scan / key decode circuit, and 5 is an output circuit. The identification code may be set externally.

Also, NEC μPD6121, Toshiba T
The one represented by 9012 is composed of full logic without using a microcomputer, and sequentially outputs data in one kind of transmission signal format. FIG. 4 is a diagram showing the schematic block thereof, in which a device operation code and an identification code corresponding to a key input of the key matrix 2 are masked R
The data register 7 and the waveform shaping circuit 8 which are read from the OM 3 and whose timing is controlled by the timing signal generation circuit 6.
The transmission format is determined by the timing signal generation circuit 6.

By the way, the format of the transmission signal varies depending on each manufacturer, and there is no standard at present. Here, the transmission signal is determined by a sequence of codes when a series of codes is used to encode the operation code of the device at the time of remote control transmission and the identification code for preventing malfunction due to interference between the devices or between different manufacturers' devices. For example, it is composed of “(reader code 1 bit) + (identification code 8 bits) + (device operation code 8 bits) + (stop code 1 bit)”. Then, such codes are sequentially output as serial data, and infrared rays are transmitted with a pulse length corresponding to each. It should be noted that this is just an example, and there are other cases in which an inverted code of the code is added or the reader code is omitted.

[0005]

However, in the above-mentioned microcomputer system, since the transmission signal format can be computer-controlled, various formats can be supported by the program, but since the microcomputer is mounted, the cost becomes high, and the remote controller can be used. It is difficult to cope with the low cost of the market.

Therefore, the one which should cope with the cost reduction is the above-mentioned full logic system, but there is a problem that the transmission signal format is fixed to one type and cannot be transferred to another format. That is, when changing to another format, it is necessary to make a large correction by logical design.

It is an object of the present invention to provide a remote control transmitting device which can realize the cost reduction similar to the full logic system and can cope with various transmission signal formats like the microcomputer system.

[0008]

To this end, the present invention operates / operates a device operation code corresponding to the operation key and an identification code for identifying the device or manufacturer by operating a specific key of the key matrix. In the remote control transmitting device for reading out from the identification code memory and outputting the sequence code, a device operation code specified by the operation key and a sequence code indicating a procedure for reading out the identification code from the operation / identification code memory are stored in the sequence memory. The sequence counter is configured to read out the sequence code from the sequence memory.

[0009]

According to the present invention, the key operation code and the identification code specified by the key operation are sequentially read out and output according to the procedure set in advance in the sequence memory as the sequence counter advances. As described above, the reading procedure is determined by the contents of the sequence memory, so that an arbitrary transmission signal format can be realized by the writing contents of the sequence code stored in the sequence memory.

[0010]

EXAMPLES Examples of the present invention will be described below. FIG. 1 is a block diagram of a remote control transmission device of the embodiment. Reference numeral 11 denotes a key matrix, which is a key scan circuit 1
The key data corresponding to the operated key switch is output from the key decoder 13 and loaded into the data register 14, and the data register 14 is scanned.
Output data becomes the address data of the identification / apparatus operation code memory 15 including the mask ROM. 16 is identification /
A sequence memory including a mask ROM that determines the transmission order of the data specified (addressed) in the device operation code memory 15, the transmission signal format is stored in advance, and its address (transmission order) is a sequence. It is designated by the output of the counter 17. Reference numeral 18 is a waveform shaping (modulation) circuit, 19 is an output buffer, 20 is a drive transistor, 21 is an infrared light emitting diode, 22 is an oscillation circuit, 23 is a ceramic oscillator, and 24 is a battery. In this functional block, a portion surrounded by a thick line in FIG. 1 can be configured by a one-chip IC.

Now, consider the following format in which all transmission signal codes are composed of 18 bits. (Reader code 1 bit) + (Identification code 8 bits) +
(Device operation code 8 bits) + (stop code 1 bit) Each code at this time is written in the sequence memory 16 under the definition shown in FIG. As a result, the sequence memory 1 is responsive to the above-mentioned transmission signal format.
6, “LED CT CT CT CT CT CT CT CT DT DT DT DT DT
The sequence code "DT DT DT STP" is set.

This sequence code is a read code pointed out in order from the beginning by the sequence counter 17, and the identification code and operation code corresponding to the read code are read from the identification / device operation code memory 15. , Is output from the output buffer 19 through the waveform shaping circuit 18. At this time, the sequence counter 17
Is incremented for each code output and sequentially determines the sequence code to be read.

That is, the reader code is first read from the identification / device operation code memory 15 and output, and then the sequence counter 17 is incremented so that the first bit of the identification code is read from the identification / device operation code memory 15. Issued and output. Continued sequence counter 1
This identification code is read and output up to the 8th bit every increment of 7. Then, when the sequence counter 17 is incremented next time, the first bit of the operation code is read from the identification / device operation code memory 15 and output, and this is also up to the eighth bit for each increment of the sequence counter 17. It is also read out. Then, the stop bit is read by the next increment of the sequence counter 17. After that, the sequence counter 17 continues to increment, and is reset when incremented to the preset maximum value. Therefore, the length of the sequence code can be set within the range up to this maximum value.

For example, if the above-mentioned format is modified to change the identification code to an inverted identification code and a repeat code is added after the stop bit, "LED CB CB CB
CBCB CB CB CB DT DT DT DT DT DT DT DT DT STP REP ''
As a whole, a 19-bit sequence code is obtained.
When changing in this way, only the write data in the sequence memory 16 needs to be changed.

Although the above embodiment has been described for the case of being applied to the infrared remote control transmitter, it is needless to say that it can be similarly applied to a radio wave type such as UHF or a wire type. In addition to the mask ROM, the sequence memory 16 includes EPROM, EEPROM, and PL.
You can use A etc.

[0016]

As described above, according to the present invention, the sequence code to be written in the sequence memory, that is, the transmission signal format can be freely set, and various transmission signal formats can be supported. Moreover, it is possible to realize cost reduction because it can be configured only with logic circuits without requiring a microcomputer.

[Brief description of drawings]

FIG. 1 is a functional block diagram of a remote control transmission device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of code definitions of a sequence ROM of the device.

FIG. 3 is a functional block diagram of a conventional microcomputer type remote control transmission device.

FIG. 4 is a functional block diagram of a conventional full logic remote control transmitter.

[Explanation of symbols]

1: Microcomputer, 2: Key matrix, 3:
Mask ROM, 4: key scan / key decode circuit,
5: output circuit, 6: timing signal generating circuit, 7: data register, 8: waveform forming circuit, 11: key matrix, 12: key scan circuit, 13: key decoder, 1
4: data register, 15: identification / device operation code memory, 16: sequence memory, 17: sequence counter, 18: waveform shaping circuit, 19: output buffer, 20:
Drive transistor, 21: infrared light emitting diode, 2
2: Oscillation circuit, 23: Ceramic oscillator, 24: Battery.

Claims (1)

[Claims] 1. A remote control transmission in which a device operation code corresponding to the operation key and an identification code for identifying the device or manufacturer are read from the operation / identification code memory and output by operating a specific key of the key matrix. In the device, a sequence code indicating a procedure for reading the device operation code specified by the operation key and the identification code from the operation / identification code memory is stored in the sequence memory,
A remote control transmission device, wherein the sequence code is read out from the sequence memory by a sequence counter.