JPS59223095A - Remote control receiver - Google Patents

Abstract

PURPOSE:To prevent malfunction of a remote control receiver caused by remote control signals having word numbers other than proper ones, by counting the bit number of a transmitting code and, only when the bit number is regular one, executing the instruction indicated by the transmitting code. CONSTITUTION:The remote control receiver is equipped with a bit number decision means 6 which deciding that whether or not the number of bits received so far is regular one when the transmitting code interval reaches a time corresponding to a word interval. The bit number decides means 6 decides whether or not the number of bits received so far, namely, the number of bits counted by a bit counter 1 is equal to a regular one. When it is decided that the number of bits received so far is equal to regular one, a control circuit 5 compares contents of the 1st and 2nd transmitting record holding means 3 and 4 with each other and checks whether they coincide with each other or not. When they coincide with each other, the instruction is executed. When they do not coincide with each other, the content of the 1st transmitting record holding means 3 is transferred to the 2nd transmitting record holding means 4 and reception of the 2nd word is statrted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a receiving device in a remote control system.

Conventionally, there has been a device of this type as shown in FIG. In the figure, 1 is a counter as a counting means for counting the number of bits of the transmission code, 2 is a means for measuring the time interval of the transmission code, and 3 is a first transmission code holding unit that temporarily holds the transmission code. Means 4 is a second transmission code holding means that receives a transmission code from the first transmission code holding means 3 when the bit counter 1 reaches a certain value; 5 is a second transmission code holding means that issues a command in response to the transmission code; This is the control circuit that executes it.

Next, the operation will be explained. FIG. 2 shows an example of the configuration of the transmission code. In this case, one word of the transmission code consists of 6 bits, and when the Norse interval is tJ'', that is, the time from the rising edge of the pulse to the rising edge is 1.5 msec or more, the bit data is ``1'', 1.5 msec. When it is less than sec, the bit data is “0”, and the transmission word interval is 5m5ec.
It is.

Initially, the count content of the focus counter l is 0, and it counts up when the rising edge of the transmission code is detected.
Further, the time interval measuring means 2 starts measuring time. Then, when the rising edge of the next transmission code is detected, the focus counter 1 further counts up to 2. At this time, based on the time measurement result of the time interval measuring means 2, the first transmission code holding means 3 is set to the first data ("1" in the example).
is stored. Thereafter, the rising edge of each pulse of the transmission code is detected in the same way, and a total of 6 bits of data (in the example, “10
1100") in the first transmission code holding means 3,
Further, the bit counter 1 detects the rising edges of seven transmission codes and counts up, and the count becomes 7.

At this time, the conceal seal circuit 5 compares the contents of the first transmission code holding means 3 and the second transmission code holding means 4 holding the previously transmitted transmission code, and determines whether they match. If they match, it is determined that two consecutive words of the same code have been received, and the control circuit 5 executes the command. If they do not match, the contents of the first transmission code holding means 3 are transferred to the second transmission code holding means 4. The control circuit 5 determines how many consecutive words must be received before executing the transmission command, and in this example it is 2 words.

Note that the focus counter l is the time when the transmission code interval corresponds to the word interval of the transmission code, in this example, 5a+sec.
When the count has passed, the time interval measuring means 2 resets the count, and the count becomes 0.

By repeating the above operations, the transmission code is received and the command is executed. Instruction execution is stopped when consecutive transmission codes do not match, or when transmission codes are not received for a long time, for example, about 50 msec.

Since the conventional remote control receiving device is configured as described above, even if the number of bits in one word of the transmission code is, for example, more than 6 bits, only 6 bits are determined to be one word, and this is stored in the transmission code holding means. 3 is stored as 6-bit data, and continuously transmitted codes are ignored, and the focus counter 1 is reset when the transmitted code interval has elapsed a time corresponding to the word interval. Even if a remote control signal with a transmission code that has more bits than the normal number of bits is sent, as long as two words of the same code are received, it will be mistakenly recognized as an execution command and the command will be executed. was there.

It is an object of the present invention to provide a remote control receiving device that does not malfunction even when receiving a remote control signal having a transmission code with a large number of bits, by providing a determining means that eliminates the drawbacks of the conventional device as described above.

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

In FIG. 3, the same reference numerals as in FIG. 1 indicate the same components. Reference numeral 6 denotes a bit number determining means for determining whether or not the number of bits received up to that point is a regular number of bits when the transmission code interval measured by the time interval measuring means 2 has elapsed a time corresponding to the word interval. be.

Next, the operation will be explained. As with the conventional example, the transmission code has 6 pins per word, and when the period from pulse rise to rise is 1.5 msec or more, the bit data is "1".
”, when it is less than 1.5'm see, the bit data is "0", and the transmission word interval is 5m5ec. In this embodiment, the number of focuses and data that can be continuously received are:
It is assumed to be 12 bits.

■It is exactly the same as the conventional example until the 6th bit of the word is received, and even after receiving the 6th bit, the time interval measuring means 2 determines that the transmission code interval is 5 m5, which corresponds to the word interval.
Until the elapse of ec is detected or until a total of 12 bits of data is received, if becomes 5m5ec or more,
That is, if the passage of time corresponding to the word interval is detected,
The time interval measurement means 2 outputs a focus number determination command signal to the bit number determination means 6. Then, the bit number determining means 6 determines whether the number of bits received so far, that is, the number of bits counted by the bit counter 1, is equal to the normal number of bits. If it is determined that they are equal, the 6-bit data in the first transmission code holding means 3 is transferred to the second transmission code holding means 4. Further, the count contents of the bit counter 1 are reset to 0 by the time interval measuring means 2, and the reception of the second word is started. Further, the bit counter 1 is set to the data of the holding means 3 whose bit number is different from the regular bit number,
These are ready to receive the next transmission code. The second word is received in the same manner as the first word, and if the transmission code interval measured by the time interval measuring means 2 exceeds the time corresponding to the word interval, that is, 5 m5ec, the bit number determining means 2 As in the case of L, it is determined whether the number of hits received so far is the correct number of focuses. If it is determined that these are equal, the control circuit 5
The contents of the transmission code holding means 3 and 4 are compared to determine whether the two contents match, and if they match, the command is executed as in the conventional example. If they do not match, the contents of the first transmission code holding means 3 are transferred to the second transmission code holding means 4, and reception of the second word is started.

In the device of this embodiment, the bit number determining means 6 determines whether the number of bits of the transmission code in one oud is a regular focus number, and only when the number of bits is regular, the command based on the transmission code is executed. As a result, remote control operations can be performed only for normal transmission codes, and malfunctions can be prevented.

In addition, in the above embodiment, the focus number data of the transmission code
Although the method of determining 0'', 61'', word spacing, etc. has been explained using specific numerical values, it goes without saying that the present invention is not limited to these numerical values.

As described above, according to the present invention, the number of bits of the transmission code is counted, and the instruction according to the transmission code is executed only when the number of focus points is the regular number of bits. This has the effect of preventing malfunctions caused by remote control signals.

[Brief explanation of the drawing]

Figure 1 is a diagram showing a conventional remote control receiver;
FIG. 2 is a diagram showing an example of the configuration of a transmission code, and FIG. 3 is a block diagram showing a remote control receiving device according to an embodiment of the present invention. 1... Counting means, 2... Time interval measuring means, 3
. . . first transmission code holding means, 4 . . . second transmission code holding means, 5 . . . control circuit (means),
6...Bit number determination means. In the drawings, the same reference numerals indicate the same or equivalent parts. Agent Masuo Oiwa

Claims (1)

[Claims] (1) Counting means for counting the number of bits of a transmission code of a remote control signal, measuring a time interval of the transmission code, outputting bit data according to the time interval, and converting the time interval of the transmission code into a word interval. time interval measuring means for outputting a bit number determination command signal and a reset signal for resetting the counting means when
(ii) a transmission code holding means for holding bit data in units of transmission codes; and a bit number for determining whether or not the number of pinots counted by the counting means in response to the bit number determination command signal is a regular number of bits. and a control means for executing a command when the received transmission code is determined by the bit number determination means to have a normal number of bits in response to the transmission code from the transmission code holding means. Characteristic remote control receiving device.