JPH0822108B2 - Signal reception processing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of processing a received signal in signal transmission for remote control of various devices in an HA system, a BA system and the like.

[0002]

2. Description of the Related Art FIG. 4 shows an example of signal transmission. In this case, the controlled device 1 is controlled by the optical wireless remote control system.
The remote control system controls the transmission signal SN transmitted from the remote control transmitter 2 in such a remote control system.
As shown in FIG. 5, is generally constituted by a start pulse ST indicating the start of the transmission signal SN, data DA indicating the control content, and an end pulse EP indicating the end of the signal. Further, these are the start pulse ST of FIG. 6A, the end pulse shown in FIG.
It is distinguished by the pulse widths of "H" and "L" like the data DA by the combination of pulses of logical values 0 and 1 shown in (c) and (d). Normally, there are various commands such as “power ON”, power OFF ”,“ level up ”,“ level down ”, and“ mode selection ”as the data DA, but the remote controller transmitter 2 has a smaller shape, cost, and user convenience. From the aspect of, it corresponds to multiple commands with one key,
A method of reducing the number of switches is often used.

That is, it is an operation procedure such as "inversion of power on / off" and "mode forward". Reversing the power on / off means changing the state of the power supply of the controlled device 1 every time the signal is received by the receiver 3 built in the controlled device 1, and the mode forward is every time the signal is received. In addition, a plurality of operation modes set in the controlled device 1 are sequentially and cyclically changed.

On the other hand, in the remote control, the transmission signal SN shown in FIG. 5 is shown by one switch operation because the remote control transmitter 2 is a handy type and noise resistance.
In many cases, the reliability of the transmission is ensured by not transmitting the data once but continuously transmitting it a plurality of times at intervals of a constant time Ta as shown in FIG. In such a case, if the first transmission signal SN ₁ is normally received and the control according to the command is performed, the transmission signals SN _2, ...

In the case of a "level up" command for dimming, temperature adjustment, etc., control is continued until the continuous transmission of the transmission signal SN is interrupted. The problem in such a case is how to distinguish the continuously transmitted transmission signal SN _a as shown in FIG. 8 from the new transmission signal SN _b1 ... When another switch is pressed. I will do it.

In the remote control transmitter 2, the transmission interval Ta of continuous transmission signals is set, and the minimum interval Tb in the case of transmitting another new transmission signal is determined as Ta <Tb. Intermediate value of Tc (Ta <Tc <
Tb) is used as a reference value for determination. On the other hand, the signal transmission is accompanied by an error, and it is fully conceivable that the error occurs during the transmission of the continuous transmission signal SN. In such a case, conventionally, the following signal processing has been performed.

That is, as shown in FIG. 9, the start pulse S
When the transmission error ER occurs as shown in the figure after the determination of T, the data processing of the transmission signal SN ends at that time t ₁ and the receiver 3 starts the built-in timer in order to measure the interval to the next signal. Then, sampling for detecting the start pulse ST is started. When the next start pulse ST is detected (determined by a plurality of consecutive coincidence samplings), the operation of the built-in timer is stopped, and whether the continuous transmission signal SN or the new transmission signal SN is determined depending on the count value at that time t ₂ . To judge.

[0008]

In the signal reception processing method as described above, if the number of consecutive coincidence samplings is small, the data sequence after the occurrence of the error ER is judged like a start pulse and the Repeatedly, the timer value eventually becomes Ta, and it is determined that the transmission signal SN is continuous.
There is a possibility that + Td becomes the count value and that it becomes larger than the intermediate value Tc. In such a case, for example, in the case of the "reverse power on / off" command, the power is turned on by the _first transmission signal SN ₁ and turned off by the third transmission signal SN ₃ as shown in FIG. There was a possibility that there would be a problem of being done.

The present invention has been made in view of the above problems, and an object thereof is to provide a signal reception processing system capable of processing a transmission signal with high safety even if an error due to noise occurs. There is.

[0010]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a start pulse during transmission format,
In a signal transmission system that transmits a transmission signal including data and end pulses multiple times at fixed time intervals, if a transmission error occurs during reception of the transmission signal after the start pulse is detected on the receiving side, the transmission signal concerned at that point If the interval between the start pulse of the transmission signal and the end pulse of the previous transmission signal is longer than a certain time, the timer is activated and sampling is performed to detect the next start pulse. Counts the time until the next start pulse is detected, and if the interval between the start pulse of the transmission signal and the end pulse of the previous transmission signal is within a certain time, it is because the end pulse of the transmission signal. Is detected, the timer is activated when the end pulse is detected, and the sampler for detecting the next start pulse is detected. The one in which to count the time until the detection of the next start pulse going.

[0011]

According to the present invention, the start pulse is detected without causing a fatal judgment that the control content changes even if an error occurs during the reception of continuous transmission signals. Even if the number of sampling times for confirmation is changed, it can be dealt with.

[0012]

EXAMPLES The present invention will be described below with reference to examples. FIG. 2 shows the circuit configuration of the receiver 3 incorporated in the controlled device of the optical wireless remote control system used in the method of the present invention. The receiver 3 receives the wireless signal from the remote control transmitter by the light receiving element 4. Then, after the received light signal is amplified by the amplifier 5, the waveform is shaped by the waveform shaping circuit 6, and then the start pulse ST, the data DA, and the end pulse EP are determined and read by the signal processing circuit 7, and a command of the data DA is obtained. The output drive unit 8 is drive-controlled based on this. The setting input unit 9 is used to set the operation contents, and the signal processing circuit 7 controls the drive of the output drive unit 8 in response to the reception of a command according to the setting contents.

The transmission signal SN from the remote control transmitter
The signal processing circuit 7 performs the following process.
That is, as shown in the flow chart of FIG. 1, first, the signal processing circuit 7 judges "H" and "L" of the output from the waveform shaping circuit 6, and if it is "H", the output signal is sampled, and a fixed number of times is reached. If both (n times) samplings are "H", it is determined that the start pulse ST. Next, the built-in timer of the signal processing circuit 7 is stopped, and it is further determined whether the timer is sent repeatedly a plurality of times or a new one,
Next, it is determined whether the received start pulse ST has a normal pulse width, and if it does not have a normal pulse width, the built-in timer is started. If normal, the reception process of the data DA is started. Then, if a transmission error occurs in the process of data processing, it is determined whether it is continuously transmitted or a new transmission, and if new, a built-in timer is started. If the signals are transmitted continuously, the end pulse EP of the transmission signal SN is detected. On the other hand, even when there is no transmission error and the data processing is completed, the end pulse EP is detected. When the detection of the end pulse EP of the transmission signal SN is detected, it is judged whether or not the detected end pulse EP has a normal pulse width, and if it is normal, whether it is continuously transmitted again. , Whether it is a new transmission, if it is new, output control,
If it is continuous, the built-in timer is started. On the other hand, when the pulse width of the end pulse EP is not normal, the built-in timer is not started and the operation immediately shifts to the detection of the next start pulse ST. As shown in FIG. 3, when the noise NS occurs immediately before the regular transmission signal SN, the noise NS is judged as a transmission error, and when the end pulse EP is detected, the time t is shorter than the end pulse width. In this case, the normal transmission signal SN is not normally processed and is processed as an error.

[0014]

INDUSTRIAL APPLICABILITY The present invention is a signal transmission system for transmitting a transmission signal including a start pulse, data, and an end pulse in a transmission format a plurality of times at fixed time intervals, and after detecting the start pulse on the receiving side, receiving the transmission signal. If a transmission error occurs during that time, the data processing of the transmission signal is stopped at that point, and if the interval between the start pulse of the transmission signal and the end pulse of the previous transmission signal is a certain time or more , a timer is Operate, perform sampling to detect the next start pulse, count the time until the next start pulse is detected, and the interval between the start pulse of the transmission signal and the end pulse of the previous transmission signal is within a certain time If it is, the detection for the end pulse of the transmission signal is performed, and the timer is detected at the end pulse detection time. It operates and performs sampling to detect the next start pulse and counts the time until the detection of the next start pulse, so the control content changes even if an error occurs during continuous transmission signal reception. There is an effect that even if the number of times of sampling for detecting and confirming the start pulse is changed, it is possible to deal with such a fatal determination.

[Brief description of drawings]

FIG. 1 is a flowchart of an embodiment method of the present invention.

FIG. 2 is a circuit configuration diagram of a receiver of a wireless remote control system using the method of the present invention.

FIG. 3 is a timing chart of a received signal for explaining an embodiment of the present invention.

FIG. 4 is a configuration diagram of an optical wireless remote control system.

FIG. 5 is a format of a transmission signal used in the optical wireless remote control system.

FIG. 6 is a waveform diagram of each signal in a transmission signal.

FIG. 7 is a timing chart of a received signal for explaining the operation of the conventional example.

FIG. 8 is a timing chart of a received signal for explaining the operation of the conventional example.

FIG. 9 is a timing chart of a received signal for explaining the operation of the conventional example.

FIG. 10 is a timing chart of a received signal for explaining the operation of the conventional example.

Claims (1)

[Claims] 1. A signal transmission system in which a transmission signal including a start pulse, data, and an end pulse in a transmission format is transmitted a plurality of times at fixed time intervals, and after the start pulse is detected on the receiving side, the signal is transmitted while the transmission signal is being received. When an error occurs, the data processing of the transmission signal is stopped at that point, and if the interval between the start pulse of the transmission signal and the end pulse of the previous transmission signal is a certain time or more , the timer is operated, Sampling to detect the next start pulse was performed and the time until the detection of the next start pulse was counted, and the interval between the start pulse of the transmission signal and the end pulse of the previous transmission signal was within a certain time. In that case, the detection for the end pulse of the transmission signal is performed, and the timer is activated at the end pulse detection time. Signal reception processing method characterized by counting the time until detection of the next start pulse performs sampling for detecting the next start pulse.