JP3381810B2 - Wireless remote control - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless remote control device, and more particularly to removal of reception noise of a wireless remote control receiver.

[0002]

2. Description of the Related Art Conventionally, a wireless remote control transmitter 1 for transmitting a wireless signal by infrared rays or a wireless signal, and a control section 4 for discriminating data by measuring the period or width of a remote control signal data pulse obtained by receiving and demodulating the wireless signal. In the wireless remote control device including the wireless remote control receiver 2 including, when a noise pulse is mixed in the remote control signal data pulse of the remote control receiver, the cycle is broken and the number of bits is changed to prevent correct reception. . For this reason, for example, in the case of an infrared remote controller, a method of improving the direction and opening method of the light receiving section 3 or attenuating noise light by the infrared removing filter 11 as shown in FIG. 5 is usually adopted. In the case of wireless communication, a noise filter based on the direction and directivity of an antenna and an electronic circuit is used instead of the light receiving unit. In the case of the above-mentioned light receiving section, noise in all directions cannot be prevented and the reception range is biased, while in the case of the infrared removal filter,
The remote control signal itself is also attenuated and the reception distance is shortened, which causes a problem. In addition, noise may jump into the receiver as an interfering electromagnetic wave. Therefore, when noise is mixed, it is difficult to remove it and improve the reception quality.

[0003]

SUMMARY OF THE INVENTION The present invention relates to a wireless remote controller, which has been made in view of the above problems of the prior art. Even if a noise pulse is mixed with the remote controller signal data pulse of the remote controller receiver, the same problem can be solved. It is an object of the present invention to provide a wireless remote control device that removes noise pulses and improves reception quality.

[0004]

In order to achieve the above object, a wireless remote control transmitter for transmitting a wireless signal by infrared rays or radio and a period or a width of a remote control signal data pulse received and demodulated by the wireless signal are measured. In the wireless remote control device including a wireless remote control receiver including a control unit that determines data, a sampling circuit, a data signal memory, attached to the control unit of the wireless remote control receiver,
A data value I obtained by providing a noise counter and sampling the remote control signal data pulse by the sampling circuit
Is compared with the previous sampling data value i, and if I and i match, the input signal data is stored and output in the data signal memory, the noise counter value N is set to 0, and if I and i are different, preset When the numerical value obtained by dividing the width of the generated noise by the sampling interval of the sampling circuit is n,
The noise counter value N is compared with n, and the noise counter value N
Is smaller than n, 1 is added to the noise counter value N, the polarity of the input signal data I is inverted, the result is stored and output in the data signal memory, and the noise counter value N is equal to or larger than n. If there is, the noise counter value N is set to 0, and the input signal data is directly stored and output in the data signal memory. Further, the noise pulse width is set to be larger than or equal to the sampling interval. The remote controller signal pulse width is larger than the noise pulse width. Further, the noise pulse width can be set by a numerical value input from a keyboard. Also, the sampling interval can be set by a numerical value input from a keyboard.

[0005]

With the above-described structure, the wireless remote control transmitter for transmitting a wireless signal by infrared rays or radio waves, and the period or width of the remote control signal data pulse received and demodulated for the wireless signal are measured to determine the data. In a wireless remote control device including a wireless remote control receiver including a control unit, a sampling circuit, a data signal memory, and a noise counter attached to the control unit of the wireless remote control receiver are provided. A sampling circuit attached to the control unit, a data signal memory, and a noise counter are provided, the data value I obtained by sampling the remote control signal data pulse by the sampling circuit is compared with the previous sampling data value i, and if I and i match,
When the input signal data is stored and output in the data signal memory, the noise counter value N is set to 0, and I and i are different,
When the value obtained by dividing the preset noise width by the sampling interval of the sampling circuit is n, the noise counter values N and n are compared. If the noise counter value N is smaller than n, the noise counter value N Is incremented by 1, the polarity of the input signal data I is inverted, stored in the data signal memory and output, and if the noise counter value N is equal to or larger than n, the noise counter value N is set to 0 and input. The signal data is stored and output to the data signal memory as it is, the noise pulse width is set to be larger than or equal to the sampling interval, and the remote control signal pulse width is set to be larger than the noise pulse width. The pulse width can be set by the number input from the keyboard, and the sampling interval can be set by the number input from the keyboard. It was made to be as configurable by. As a result, the noise can be removed from the wireless remote control signal data containing the noise.

[0006]

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same parts as those in the conventional example have the same reference numerals. As shown in FIG. 1, the wireless remote control device of the present invention comprises a transmitter 1 and a receiver 2. Further, infrared rays of a specific wavelength are optically modulated from the transmitter by a remote control data pulse and sent from the light emitting section of the transmitter toward the light receiving section of the receiver. Here, the receiver includes a light receiving unit 3 for receiving the infrared light and demodulating it into remote control data pulses, a control unit 4, a sampling circuit 5 for removing noise, a data signal memory 6, a noise counter 7, a keyboard 8, and a display 9. Composed of. In this embodiment, infrared rays are used as the carrier wave, but the present invention may use radio waves. In this case, the light emitting section is used as the transmitting section and the light receiving section is used as the receiving section, and the wireless carrier wave is generated by the remote control data pulse. Is modulated and transmitted from the transmitter of the transmitter to the receiver of the receiver.

Next, the noise removal filtering processing program will be described with reference to the receiver operation flowchart of FIG. This processing is performed by the control unit as an interrupt processing routine by sampling pulses from the sampling circuit at regular intervals, and the noise pulse width is set to a value which is equal to or larger than the sampling interval in advance, and the remote control signal pulse width is larger than the noise pulse width. Set to the value
The value n obtained by dividing the noise pulse width by the sampling interval is determined. First, the control unit reads the sampling data value I (H or L) of the current remote control signal data pulse from the light receiving unit, and the previously stored sampling data value i
(S1). If Yes here, the control unit sets the noise counter value N provided as an accessory to 0 (S3), stores I in i (S6), outputs it to the data signal memory, and returns to the main routine. On the other hand, if No, the control unit determines whether the value of the noise counter value N is equal to or larger than n (S2). Here, if Yes, the noise counter value N provided in the RAM attached to the control unit is set to 0 (S
3) Save I in i (S6), output it to the data signal memory, and return to the main routine. On the other hand, if No, 1 is added to the noise counter value N (S4).
Then, the polarity of the sampling data value I (H or L) of the current remote control signal data pulse is inverted and stored in I (S5). Further, the data value I is saved in i (S6)
Output to the data signal memory and return to the main routine. FIG. 3 is a timing chart of the detailed operation of the remote control signal data pulse processed by the above noise removal program. The remote control signal data pulse is sampled by the sampling pulse, and when n = 3, the polarity of the output signal is inverted in three sampling pulse intervals from the rising and falling edges of the remote control signal data pulse. This output signal is
In the polarity inversion section shown in (1), since it is fixed to either H or L, the noise pulse within this time is removed.
FIG. 4 is a timing chart showing the remote control signal data pulse, the noise pulse, the input signal pulse of the light receiving portion, and the output signal pulse from which the noise has been removed by the present invention, and * indicates the inverted noise due to the phase difference. . As a result, the remote control signal pulse is a pulse train having a leader bit at the beginning and a different interval depending on data 1 or data 0, but the output signal pulse is the same as the data with a fixed sampling time delay but noise is removed.

The sampling interval may be set by inputting it from the keyboard. This is effective in reducing the load of the interrupt processing of the control unit corresponding to the noise pulse width. Further, the noise pulse width may be set by inputting it from a keyboard. This is effective for setting the noise pulse width according to the remote control usage state and obtaining the optimum environment.

[0009]

As described above, according to the present invention, a wireless remote control transmitter for transmitting a wireless signal by infrared rays or radio, and a period or a width of a remote control signal data pulse obtained by receiving and demodulating the wireless signal are measured,
In a wireless remote controller including a wireless remote controller receiver having a control unit for determining data, a sampling circuit, a data signal memory, and a noise counter attached to the control unit of the wireless remote controller receiver are provided, and the sampling circuit is provided. By comparing the data value I obtained by sampling the remote control signal data pulse with the previous sampling data value i, if I and i match,
When the input signal data is stored and output in the data signal memory, the noise counter value N is set to 0, and I and i are different,
When the value obtained by dividing the preset noise width by the sampling interval of the sampling circuit is n, the noise counter values N and n are compared. If the noise counter value N is smaller than n, the noise counter value N Is incremented by 1, the polarity of the input signal data I is inverted, stored in the data signal memory and output, and if the noise counter value N is equal to or larger than n, the noise counter value N is set to 0 and input. The signal data is stored and output to the data signal memory as it is, the noise pulse width is set to be larger than or equal to the sampling interval, and the remote control signal pulse width is set to be larger than the noise pulse width. The pulse width can be set by the number input from the keyboard, and the sampling interval can be set by the number input from the keyboard. It was made to be as configurable by. As a result, it is possible to remove the noise from the wireless remote control signal data in which noise is mixed, prevent reception failure of the remote control, and improve reception quality. Further, since no special mechanism is required, the cost does not increase.

[Brief description of drawings]

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

FIG. 2 is a flowchart of a receiver operation showing an embodiment of a wireless remote control device according to the present invention.

FIG. 3 is a timing chart showing the detailed operation of FIG.

FIG. 4 is a timing chart of a receiver operation showing an embodiment of the wireless remote control device according to the present invention.

FIG. 5 is a block diagram showing a conventional wireless remote control device.

[Explanation of symbols]

1 transmitter 2 receiver 3 Light receiving part 4 control unit 5 Sampling circuit 6 Data signal memory 7 noise counter 8 keyboard 9 display

Claims (5)

(57) [Claims] 1. A wireless remote control transmitter for transmitting a wireless signal by infrared rays or radio, and a control unit for measuring the cycle or width of a remote control signal data pulse received and demodulated from the wireless signal to discriminate the data. A wireless remote control device including a wireless remote control receiver, wherein a sampling circuit, a data signal memory, and a noise counter attached to a control unit of the wireless remote control receiver are provided, and a data value obtained by sampling a remote control signal data pulse by the sampling circuit. I is compared with the previous sampling data value i, and if I and i match, the input signal data is stored and output in the data signal memory, the noise counter value N is set to 0, and if I and i are different, The set noise width is set to the sampling circuit When the numerical value divided by the sampling interval is n, the noise counter value N is compared with n. If the noise counter value N is smaller than n, 1 is added to the noise counter value N to determine the polarity of the input signal data I. When the noise counter value N is equal to or larger than n, the noise counter value N is set to 0 and the input signal data is directly stored and output in the data signal memory. A wireless remote control device characterized by the above. 2. The noise pulse width is set to be greater than or equal to a sampling interval.
The described wireless remote control device. 3. The wireless remote control device according to claim 1, wherein the remote control signal pulse width is larger than the noise pulse width. 4. The wireless remote controller according to claim 1, wherein the noise pulse width can be set by a numerical value input from a keyboard. 5. The wireless remote controller according to claim 1, wherein the sampling interval can be set by a numerical value input from a keyboard.