JPH0865777A - Remote control receiver - Google Patents

Abstract

PURPOSE: To provide a remote control receiver for not causing malfunction by eliminating the influence of noise other than normal data from a remote controller. CONSTITUTION: This receiver is provided with means 1 and 2 for converting remote control signals transmitted by PPM serial signals to electric binary signals (pulse signals) and a microcomputer 3 for inputting the pulse signals and outputting control signals corresponding to the remote control signals. Then, the periods of the respective pulses of the pulse signals are counted in the microcomputer, the pulse is judged as the data when the period matches with the period of one data included in the remote control signals and the other pulse signals are processed as the noise or errors. Also, when the period of a detected pulse is shorter than normal signals and judged as the noise, the periods are accumulated and judged as a normal pulse when they become equal to the period of the normal pulse.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used to operate home electric appliances such as televisions and videos, and information processing equipment such as personal computers.
The present invention relates to a remote control receiving device that receives a remote control signal using infrared rays or the like.

[0002]

2. Description of the Related Art An infrared remote controller distinguishes bit data by PPM (pulse position modulation) of an infrared (950 nm) pulse of a certain wavelength, and transfers data of a predetermined number of bits. On the receiving side, the pulse period is discriminated by the rising edge or the falling edge of the signal waveform, and the data is received. In this case, receiving noise other than the regular signal (remote control signal) from the remote control may cause inoperability or malfunction, so use an optical filter that transmits only the infrared wavelength used in the remote control in the light receiving part, or I am devising the direction of the department and how to open it. However, when a noise pulse with a wavelength close to infrared rays used by the remote controller enters the light receiving part from almost the same direction as the remote controller, the waveform of the remote controller signal pulse is distorted,
Correct operation cannot be performed.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a remote control receiving device which receives only a regular signal from a remote control and which does not malfunction. .

[0004]

In a device for receiving a remote control signal transmitted by a PPM serial signal, a means for converting the remote control signal into an electric binary signal (pulse signal) and the remote control signal by inputting the pulse signal. Is provided with a microcomputer that outputs a control signal corresponding to the pulse signal, the microcomputer counts the period of each pulse of the pulse signal, and when the period matches the period of one data included in the remote control signal, the pulse is output. It is determined as data, and other pulse signals are processed as noise or error. Further, when the period of the detection pulse is shorter than the regular signal and is judged to be noise, the periods are accumulated, and when it becomes equal to the period of the normal pulse, this is judged to be the normal pulse.

[0005]

Since only the pulse equal to the period of the normal pulse is processed as a signal, the influence of noise mixed in the light receiving portion of the remote control device can be excluded.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A remote control receiver according to the present invention will be described in detail below with reference to the drawings. 1 is a block diagram of one embodiment, FIG. 2 is a timing diagram of main signals, and FIG. 3 is a signal processing flowchart. Here, 1 is a light receiving part, 2 is a photoamplifier, 3 is a microcomputer, S0 is an infrared remote control signal,
S1 is infrared noise, S2 is photoamplifier output signal, S
Reference numeral 3 is a control signal. The infrared rays incident on the light receiving unit 1 are only the infrared remote control signal S0 from a remote controller (not shown) when there is no noise S1. Infrared remote control signal S0
Is the reader section for the period dL, the 1 signal section for the period d1, and the period d0
And the 0 signal part of the
L is the longest, the period of 0 signal part is the shortest, and the period of 1 signal part is a PPM code having an intermediate length. This signal is received by the light receiving unit 1, converted into an electric signal, amplified and shaped by the photoamplifier 2, and input to the input port of the microcomputer 3 as a binary pulse signal. The microcomputer 3 performs an edge interrupt process on the signal S2, decodes the PPM code, and outputs it as a control signal S3 for each part of the main body.

As the infrared rays incident on the light receiving portion 1, not only the signal S0 but also the noise S1 is mixed. The output S2 of the photoamplifier 2 in this case is generally the logical sum of the signal S0 and the noise S1 as shown in FIG.
In some cases, it may be an exclusive OR as shown in. In any case, decoding as it is causes a malfunction.

Therefore, it is assumed that the signal processing shown in FIG. 3 is used to perform decoding that is not affected by noise. Here, C is the current pulse edge interrupt period, c is the previous pulse edge interrupt period, D is a flag indicating the type of interrupt period, 0 is 0 data bit, 1 is 1 data bit, 2 is leader bit, and 3 is Represents noise. B is a bit number counter, and Bx is a specified bit number of the remote control signal. dLx is the maximum value of the reader bit period, dLn is the minimum value of the reader bit period, d1x is the maximum value of 1 data bit period, d1n is the minimum value of 1 data bit period, d0x is the maximum value of 0 data bit period,
d0n is the minimum value of the 0 data bit period. L is a data bit reception flag, where 0 is a leader bit reception period and 1 is a data bit reception period.

If an interrupt occurs at the rising or falling edge of the pulse of the output S2 of the photoamplifier 2, the remote control signal processing routine is entered at step P1. The edge detection of the pulse S2 can be performed by hardware processing, a microcomputer built-in function, or microcomputer software. Step P2
Then, it is checked whether or not the previous noise interruption D = 3, and if it is a noise interruption, the previous interruption period c is added to the current interruption period C and updated in step P3. In step P4, it is checked whether it is the leader bit reception period or the data bit reception period. When it is the leader bit reception period, it is checked in steps P9 and P10 whether the interrupt period C is within the range of the leader bit period. If it is within the range, in step P11. D is set to 2 indicating a leader bit, L is set to 1 indicating a data reception period in step P19, and step P is set.
At 20, the bit counter B is set to 0 and the process returns to the main. In step P9, when the interrupt period C is longer than the maximum of the leader bit period, it returns to the main as an error. When the interrupt period C is shorter than the minimum of the leader bit period in step P10, it jumps to step P14 as noise. In the data bit receiving period in step P4, it is checked in steps P5 to P8 whether the interrupt period C is in the period of 1 data or 0 data, and if it is, the bit data storing routine P15 is executed as the regular data, and step P17 is performed. Then, the data bit number counter B is turned up, and if it does not reach the specified number of bits in step P18, the process returns to the main and waits for the next data bit. When the specified number of bits is reached, the main unit waits for a new leader signal in step P21 Return to.
When C does not match the period of the data bit, it is regarded as a noise interruption, D = 3 is set in steps P14 and P16, the current interruption period C is substituted for c, and the process returns to the main. If the interrupt period C is longer than the maximum of one data period in step P5, there is no prospect of recovery, and an error occurs and the process is restarted from the reception of the reader bit.

Although the infrared remote controller has been assumed as the embodiment, the present invention is not limited to the infrared remote controller, and it goes without saying that the same can be applied to a remote controller using radio waves.

[0011]

EFFECTS OF THE INVENTION In a remote control receiving device for receiving a PPM (pulse position modulation) remote control signal using infrared rays or the like, which is used for operating a home electric appliance such as a television or a video or an information processing equipment such as a personal computer, Since only data that matches the pulse period is captured as data, it is possible to obtain a remote control receiver that is not affected by noise and does not malfunction. Further, even when it is determined to be noise, by summing up the periods to restore the data, the remote control receiving device with less inoperability can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram of one embodiment according to the present invention.

FIG. 2 is a timing diagram of main signals of an embodiment according to the present invention.

FIG. 3 is a signal processing flowchart of one embodiment according to the present invention.

[Explanation of symbols]

 1 light receiving part 2 photo amplifier 3 microcomputer S0 remote control signal S1 noise S2 photo amplifier output signal P1 to P21 each processing step number D data flag L data period flag B data bit number counter Bx data prescribed bit number dLx maximum value of reader bit period dLn Minimum value of leader bit period d1x 1 Maximum value of data bit period d1n 1 Minimum value of data bit period d0x 0 Maximum value of data bit period d0n 0 Minimum value of data bit period

Claims (3)

[Claims] 1. In a receiving device for receiving a remote control signal transmitted by a PPM (pulse position modulation) signal, a means for converting the remote control signal into an electrical binary signal (pulse signal), and inputting the pulse signal, A microcomputer for outputting a control signal according to a remote control signal is provided, the microcomputer counts the period of each pulse of the pulse signal, and when the period matches the period of one data included in the remote control signal, A remote control receiver characterized by determining a pulse as data of a remote control signal and processing other pulse signals as noise or an error. 2. The maximum value and the minimum value of the pulse period are set for each data included in the remote control signal, and the pulse period of the pulse signal is within the range of the maximum value and the minimum value of the pulse period of one data. The remote control receiving device according to claim 1, wherein the remote control signal is determined as data of a remote control signal. 3. When the pulse signal is judged to be noise or error and there is a possibility of receiving the data of the remote control signal of a period longer than the pulse signal, the period of the pulse signal is accumulated and the value thereof is accumulated. 2. The remote control receiver according to claim 1, wherein when is determined to be the period of the data of the remote control signal, this is treated as data of the remote control signal, and when it is not determined to be data, it is processed as an error.