JPH0949733A - Method and apparatus for detecting angle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly detect a coming angle of a light from a remote controller by correcting the coming angle of the light when a control signal is in a second state by means of a value stored in an angle memory means when the control signal is in a first state. SOLUTION: The apparatus is provided with an angle detector 2 for obtaining a pair of electric signal outputs corresponding to a detecting angle of a light signal from a remote controller 1, sample hold circuits 8, 9 for holding sample values to the pair of outputs, an angle calculation means 11 for operating an arrival angle of the light from the sample values, an adjustment mode-switching means 42 for outputting a control signal in accordance with two states selected by a user, and an angle memory circuit 43 to which the control signal and sample hold values are input for storing the arrival angle obtained at the calculation means 11 only when the control signal is in a first state. The arrival angle of the light obtained by the calculation means 11 when the control signal is in a second state is corrected by a stored value in the memory circuit 43, so that the arrival angle is calculated more correctly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver, a game machine, an audio device such as a radio, a speaker system, a camera with a turntable, a room cooler for changing the wind direction, and the like.
An angle detection method and an angle detection device used for receiving a wireless remote control signal, automatically detecting the direction of the wireless remote control, orienting the main body or a part of the main body toward the remote control, and controlling the volume of a speaker. It is about.

[0002]

2. Description of the Related Art FIG. 13 shows a circuit configuration of an angle detecting device applied to a television receiver. Reference numeral 1 is a remote controller for transmitting an infrared remote control signal by a user,
Reference numeral 2 is an angle detector that receives a signal from the remote controller 1 and outputs two voltages depending on the light receiving angle of the remote controller light.
The angle detector 2 includes a lens 3 and a PSD (position).
Sensitive Device 4 and current / voltage conversion circuits 5 and 6, and the remote control light collected by the lens 3 is incident on the semiconductor element on the PSD 4.
Depending on the incident position, a pair of currents are output from the electrodes attached to both ends of the semiconductor, converted into voltages by the current / voltage conversion circuits 5 and 6, respectively, and a pair of voltages are output from the output terminals 17 and 18.

The pair of voltages are input to the angle calculation means 7, are subjected to a certain process, and output the remote control light arrival direction θ. Hereinafter, the details of the angle calculation means 7 will be described. The pair of voltages are sampled and held by the sample and hold circuits 8 and 9, and both are held by the microcomputer 10.
It is input to the angle calculation means 11 inside. The outputs of the sample and hold circuits 8 and 9 are input to the analog multiplexer 12 in the angle calculation means 11, which controls the changeover switch function. The output of the analog multiplexer 12 is converted into a digital signal by the analog / digital conversion circuit 13 and input to the CPU 15 through the input circuit 14. The CPU 15 calculates the arrival direction angle θ of the remote control light according to the following equation (1) based on the program and data stored in the memory 16. θ = K · (V ₁ −V ₂ ) / (V ₁ + V ₂ ) ... (1) where K: constant V ₁ : voltage value of output terminal 17 of angle detector ₂ V ₂ : angle detector 2 Voltage value of output terminal 18

Further, in this conventional example, the rotary table attached to the television receiver is rotated by a motor by using the arrival direction angle θ of the remote control light obtained as described above.
The remote control automatically directs the receiver in the direction of light arrival, and is configured as follows. The CPU 15 collates with the data stored in the memory 16 in order to make the calculated arrival direction angle θ zero, and generates a control signal corresponding to the direction angle θ in the direction of decreasing this direction angle θ, and outputs it. It outputs to the left-right drive control circuit 20 through the circuit 19. The left-right drive control circuit 20 rotationally drives the motor M in the forward or reverse direction. A signal from the angle sensor 21 attached to the motor M is input to the CPU 15 through the input circuit 14. The CPU 15 checks the signal from the angle sensor 21, and when the detected signal matches θ, stops the motor M at that position.

[0005]

Since the conventional angle detecting device is constructed as described above, there is no means for correcting an error due to the geometrical deviation of the angle detector, and a function for eliminating the influence of external light noise. If the remote control is close to the controlled device body, the signal will be saturated, and if the remote control is distant from the controlled device body, the S / N will deteriorate, resulting in an error in the calculated angle. There was a big problem.

The present invention has been made to solve the above-mentioned problems, and corrects the deviation of the peripheral optical system with respect to the position detecting element such as a lens, effectively removes the influence of external light noise, and An object of the present invention is to obtain an angle detection method and an angle detection device capable of detecting an angle with a small error by automatically obtaining an optimum signal gain regardless of the distance between the remote controller and the controlled device main body.

[0007]

An angle detecting method according to the present invention includes a step of receiving an optical signal from a remote controller and obtaining a pair of electric signal outputs corresponding to a light receiving angle of the remote controller light; A step of holding a sample value with respect to the electric signal output and calculating the arrival angle of the remote control light from the sample value, a step of outputting a control signal according to two states selected by the user, and the control signal 1
The step of storing the arrival angle of the remote control light only in the above state, and the arrival angle of the remote control light obtained from the angle calculation means in the second state of the control signal is stored in the angle storage means. And a more accurate remote control light arrival angle is calculated.

Further, the angle detecting device according to the present invention receives an optical signal from the remote controller and obtains a pair of electric signal outputs according to the receiving angle of the remote controller light, and a pair of the angle detecting means. Sample hold means for holding the sample value with respect to the electric signal output, angle calculating means for calculating the arrival angle of the remote control light from the sample value, the user can select two states, and the control signal is output according to the states. Adjusting mode switching means for inputting the control signal and the sample and hold value, and the control signal is the first
When the control signal is in the second state, the remote control light obtained from the angle calculation means arrives when the control signal is in the second state. The angle is corrected by the value stored in the angle storage means to calculate a more accurate remote control light arrival angle.

Further, an angle detecting means for receiving an optical signal from the remote controller and obtaining a pair of electric signal outputs according to a light receiving angle of the remote controller light, and an input switching means for switching a pair of electric signal outputs of the angle detecting means. , Sample holding means for holding a sample value for the electric signal output obtained by this input switching, angle calculating means for calculating the arrival angle of the remote control light from the sample value, the user can select one of two states, and An adjustment mode switching means for outputting a control signal in response to the control signal, and the arrival angle of the remote control light obtained by the angle calculation means only when the control signal and the sample hold value are input and the control signal is in the first state. Angle control means for controlling the second control signal.
In this state, the arrival angle of the remote control light obtained from the angle calculation means is corrected by the value stored in the angle storage means to calculate a more accurate remote control light arrival angle.

Further, the angle calculation means receives the remote control signal received by the remote control light receiving section, outputs a sample hold control signal to the signal portion of the remote control signal and a non-signal portion immediately thereafter and to the sample hold means. The difference between the sample values of the signal part and the non-signal part is obtained from the sample value obtained from the sample hold means, and the arrival angle of the remote control light is calculated from this difference.

The angle calculation means receives the remote control signal received by the remote control light receiving section, outputs a sample hold control signal to the sample hold means a plurality of times in the signal portion of the remote control signal, and outputs from the sample hold means. The difference between the sample values is calculated from the obtained multiple sample values.If the difference is greater than a certain value, the sample value is discarded, and if the difference is less than the certain value, the arrival angle of the remote control light is calculated using these sample values. Is calculated.

The angle calculating means changes the amplification factor of the pair of electric signals obtained from the angle detecting means by the gain control signal obtained according to the input sample value.

The angle calculation means receives sample values obtained for a plurality of remote control optical signals, performs an averaging process on the sample values or a value obtained by subjecting the sample values to a certain process, and outputs the result. It is used to calculate the arrival direction of the remote control light.

Further, a bandpass filter for allowing only a frequency near the carrier of the remote control optical signal to pass through a pair of electric signals obtained by the angle detecting means is provided.

Further, the input switching means is controlled to be switched by the angle calculating means, and the input is switched every time the sample value is taken in.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. 1 is a block diagram showing a first embodiment of the present invention, and FIG. 2 is a diagram showing an electric circuit configuration thereof. In FIGS. 1 and 2, the remote controller optical signal transmitted from the remote controller 1 is received by the angle detector 2. Angle detector 2
Is the lens 3 and PSD (Position Sensi)
remote device 4 and current / voltage conversion circuits 5 and 6. The remote control light focused by the lens 3 is incident on the semiconductor element on the PSD 4, and is attached to both ends of the semiconductor element depending on the incident position. A pair of currents are output from the electrodes and converted into voltages by the current / voltage conversion circuits 5 and 6, respectively, and output terminals 17 and 18 thereof are provided.
Further, it outputs a pair of voltages V ₁ and V ₂ according to the light receiving angle. These V ₁ and V ₂ are input to the signal processing circuits 22 and 23 in the angle calculation means 7, respectively, subjected to a series of processing, sampled and held in the sample hold circuits 8 and 9, and then in the angle calculation means 11. Of the analog multiplexer 12. The signal processing circuits 22 and 23 are the same, and the processing circuit 23 will be described here.

In FIG. 1, the output voltage V ₂ is input to the amplifier circuit 47 in the signal processing circuit 23. In the amplifier circuit 47, as shown in FIG.
Is input to the negative side of the operational amplifier 26 via. The positive side of the operational amplifier 26 is held and clipped at a constant potential,
On the negative side, the resistor 27 to
The other ends of these resistors are connected together to the output side of the operational amplifier 26. Capacitor 2 here
The value of 4 is C ₂₄ , the values of resistors 25 and 27 are R ₂₅ and R, respectively.
₂₇ , the output voltage V ₃ of the operational amplifier 26 when the switch 31 is connected to the resistor 27 is expressed by the following equation (2). V ₃ = {R ₂₇ / (R ₂₅ + 1 / jωC ₂₄ )} · V ₂ (2) ω: Angular frequency of input signal Therefore, the magnitude of the output voltage V ₃ of the operational amplifier 26 | V ₃
| Is given by the following equation (3). | V ₃ | = {R ₂₇ / [R ₂₅ ² + (1 / ωC ₂₄ ) ² ] ^1/2 } · V ₂ (3) That is, | V ₃ | for the angular frequency ω of the input signal is Figure 3
become that way. Now, assuming that the carrier angular frequency of the remote control signal is ω ₀ , by selecting R ₂₅ and C ₂₄ so that ω ₀ ≈K / R ₂₅ C ₂₄ (where K is a constant of about 2 to 3), A noise component lower than the carrier of the remote control signal can be removed. Here, switch 31
Needless to say, when is connected to resistors 28, 29, or 30, the numerator of formulas (2) and (3) is R ₂₈ , R ₂₉ , or R ₃₀ , respectively.

Here, the switching control signal of the gain changeover switch 31 is output from the CPU 15 in the microcomputer 10 described later through the output circuit 19. The output V _{3 of the} operational amplifier 26 is a resistor 32 and a capacitor 33.
Through the buffer 34. When the resistance value of the resistor 32 is R ₃₂ and the value of the capacitor 33 is C ₃₃ , the output V _{4 of the} buffer 34 is as shown in FIG. Where R ₃₂ , C
_By setting the value of ₃₃ to 1 / R ₃₂ C ₃₃ ≈Kω ₀ (where K is a constant of 2 to 3), it is possible to remove noise components having a frequency higher than the carrier angular frequency ω ₀ of the remote control signal. That is, the band pass filter 45 (and 46) is formed by R ₂₅ , C ₂₄ , R ₃₂ , and C ₃₃ .

The output of the buffer 34 is accumulated in the capacitor 36 through the diode 35 in the sample hold circuit 9 or discharged by the discharge resistors 37 and 38 and the switching transistor 39. Here, the discharge resistance 3
The values of 7, ₃₈ and the capacitor 36 are R ₃₇ , R ₃₈ , and
When _{C 36, R 37 C 36 >>} 2π / ω 0, R 38 C 36 <<
2π / ω ₀ is satisfied. That is, the voltage waveform across the capacitor 36 when the switching transistor 39 is on and off in the remote control signal portion is as shown in FIG. 5, and when it is off, the sample and hold period. Here, a method of controlling the switching transistor 39 for sample-holding will be described. The remote control signal transmitted from the remote controller 1 is received by the light receiving unit 40, input to the CPU 15 through the input circuit 14 in the microcomputer 10, and interrupts. The CPU 15 uses the output circuit 19 as a sample hold control signal in advance to process the circuit 2.
A signal (for example, 5 V) for turning on the switching transistors in 2 and 23 is output in advance. That is, the electric charges on both ends of the capacitor 36 of the sample hold circuit are discharged.
Further, the CPU 15 is a ROM (Read Only).
After the remote control signal is input according to the interrupt processing program data stored in the Memory 16
According to a certain fixed time rule, the sample hold control signal is output through the output circuit 19 to the switching transistors 39 in the processing circuits 22 and 23 as OFF signals (for example, 0V).

The output of the sample and hold circuit 9 on the side where the OFF signal is output (the signal output of the resistor 38 that is not on the ground side) is converted into a digital signal by the analog / digital conversion circuit 13 through the analog multiplexer 12 in the microcomputer. , CP through the input circuit 14
It is input to U15. Here, the above-mentioned time rule in the interrupt processing in the CPU 15 is as shown in FIG. 6, (a) is an input / output signal of the processing circuit 22, and (b) is.
Are input / output signals of the processing circuit 23. In both (a) and (b), the dotted line is the input signal and the solid line is the output signal. That is,
In the figure, during the period of a ₁ , a ₂ and a ₃ , the sample and hold of the input signal to the processing circuit 22 and the acquisition to the CPU, b
During the period of ₁ and b ₂ , the input signal to the processing circuit 23 is sampled and held and taken into the CPU.

Here, the values fetched by the CPU 15 during the periods a ₁ , a ₂ , a ₃ , b ₁ , b ₂ are Va ₁ , respectively.
Let Va ₂ , Va ₃ , Vb ₁ , and Vb ₂ . Where Va
According to FIG. 7, switching control of the switch 31 is performed through the output circuit 19 in order to make the amplification factor of the amplification circuit 27 in the processing circuits 22 and 23 appropriate according to the levels of ₁ and Vb ₁ . In the case of cases 1 to 4, 7, and 9 in the figure, it is determined that a signal of an appropriate level was not obtained, and therefore Va ₁ to
Discard the Vb ₂ data. On the other hand, in cases 5, 6, and 8, it is determined that the signal level is appropriate, and the process moves to the process for removing the noise component superimposed on the input signal. Whether or not noise (for example, due to a level difference between direct light and reflected light, which is considered to be noise due to incident reflected light) may be superimposed on the signal portion of the remote control signal by comparing Va ₁ and Va ₂ . That is, in the CPU 15, | Va ₁ -V
a ₂ | is compared with a preset constant V ₀ , and | Va ₁ −
When Va ₂ |> V ₀ , it is determined that noise is superimposed, and the data of Va ₁ , Va ₂ , Va ₃ , Vb ₁ and Vb ₂ are discarded. Conversely, when | Va ₁ −Va ₂ | ≦ V ₀ ,
For the signals of the processing circuits 22 and 23, the following calculation is performed in the CPU 15 in order to remove the background noise. _{D 11 = (Va 1 + Va} 2) / 2 -Va 3 ··· (8) D 21 = Vb 1 -Vb 2 ··· (9)

That is, D ₁₁ and D ₂₁ are the processing circuits 2 respectively.
It is a value obtained by removing the noise in the signal part and the background noise component from the remote control signal that has passed through 2 and 23, and these values are stored in a RAM (Random Access M).
It is accumulated once in the memory 41. Further, the above operation is
Repeated once (even times from 8 to 16), N data pairs (D
₁ n, D ₂ n) (n = 1 to N) are obtained and stored in the RAM 41.

Further, in order to absorb the difference in the conditions of the sampling and holding positions of (a) and (b) as shown in FIG. 6, the sampling and holding for the processing circuits 22 and 23 at the first to N-th data acquisition. Figure 8
6A and 6B are alternately performed as described above.
That is, at the nth data acquisition, (a) when n = odd D ₁ n = (Va ₁ + Va ₂ ) / 2 −Va ₃ ... (10) D ₂ n = Vb ₁ −Vb ₂ ... (11) (a) When n = even number D ₁ n = Vb ₁ −Vb ₂ ... (12) D ₂ n = (Va ₁ + Va ₂ ) / 2−Va ₃ ... (13) N = 1 ~ N is an integer.

N sets of data (D
₁ n, D ₂ n) are averaged in the CPU 15 as follows. _{D 1 = (D 11 + D} 12 + ··· + D 1N) / N ··· (14) D 2 = (D 21 + D 22 + ··· + D 2N) / N ··· (15) or more than, D ₁ and D ₂ are each data pair (D ₁ n, D
₂ n) has the noise component further removed. For these D ₁ and D ₂ , the CPU 15 has the ROM 16
According to the program and data stored in
According to 6), the angle θ0 is obtained. θ ₀ = K · (D ₁ −D ₂ ) / (D ₁ + D ₂ ) ... (16) K: The constant θ ₀ indicates the arrival direction angle of the remote control light in principle.
Actually, it includes an error due to a geometrical deviation of each component in the angle detector 2. In this embodiment, the lens 3 and P
It means the deviation between SD4.

The method of removing the error due to this deviation will be described below. The switch 42 is an adjustment mode switching means for switching between the adjustment mode (5V) and the normal mode (0V). Now, when the switch 42 is connected to 5V, this voltage is input to the CPU 15 through the input circuit 14 in the microcomputer 10, and the CPU 15 enters a data standby state. Here, a predetermined known angle with respect to the angle detector 2, for example, the vertical direction (remote control light arrival direction angle θ)
= 0), the remote control signal is transmitted. The remote control signal received by the angle detector 2 is subjected to the above-described process and then C
It is assumed that the PU 15 obtains the value of the following equation as the angle θ ₀ . θ ₀ = θ ₁ (17) Here, θ ₁ is the geometrical deviation of the angle detector 2. The CPU 15 stores θ ₁ in the E ² PROM (nonvolatile rewritable memory) 43.

When the switch 42 is connected to 0V, the CPU 15 is in the normal mode. That is, when the remote control signal is received, the CPU 15 obtains θ _{0 based} on the above series of processes. The CPU 15 uses the E ² PROM 43
Then, θ ₁ is read and the deviation is corrected by the following equation (18). θ = θ ₀ −θ ₁ (18) That is, the first effect is that θ does not include an error due to the geometrical deviation of the angle detector 2 and accurately represents the remote control light arrival angle. is there. In addition, the light receiving state in which the light receiving level of the remote control light is reflected by the surrounding wall or the like and is incident at a weak level is reliably identified. That is, the fact that the user has projected the image on a television set, for example, is shown in FIG.
Since the recognition processing is performed such that the signal can be recognized by processing and discarding the signal in each case, there is the second effect of reliably processing the projected light. Further, in the case of a television set used indoors, it is necessary to reliably remove external noise light (flicker of light from a fluorescent lamp) as shown in FIG.
50, 60, 100, 120Hz in the processing of 1, 12
Needless to say, this can be dealt with by incorporating a process for identifying periodic noise light such as.

In the present embodiment, the rotary table mounted on the television receiver is rotated by using the remote control light arrival angle obtained as described above, and the tube surface is directed in the direction of the remote control. Is the same as the conventional example.
Although the adjustment mode changeover switch 42 is manual in this embodiment, a code corresponding to the adjustment mode and the normal mode is transmitted from the remote control transmitter, and the light receiving unit 4 is operated.
0, the code can be decoded in the CPU 15 through the input circuit 14 and the processing according to the mode can be performed. Further, although the lens 3 is used as the angle detector in this embodiment, the same angle detection can be performed by providing a slit on the front surface of the PSD 4. Also,
In this embodiment, the peak detection circuit is used as the sample hold circuit, but sample hold can also be performed by applying a low pass filter having a cutoff frequency sufficiently lower than the carrier of the remote control signal. Furthermore, in this embodiment, the television receiver to which the turntable is attached is used as the controlled device, but the controlled device rotated by the motor is not limited to the television receiver, but the base of the camera, the fan, the air It may be a wind direction deflecting device of a harmony machine.

Embodiment 2 In the first embodiment, the processing of the outputs obtained at the output terminals 17 and 18 of the angle detector 2 is separately performed by the signal processing circuits 22 and 23.
Since the data captured in PU is one by one,
It is also possible to use a single signal processing circuit. 9 is a block diagram thereof, and FIG. 10 is a circuit configuration diagram thereof. An input selector switch 44 for switching between two outputs of the angle detector 2,
It differs from the first embodiment in that it has one signal processing circuit 23 connected to it. Input selector switch 44
Is controlled by the CPU 15 through the output circuit 19.

As a method of fetching the output data from the output terminals 17 and 18 of the angle detector 2, first, the switch 44 is connected to the output terminal 17, and Va ₁ and V ₁ are connected as in the first embodiment.
a ₂ and Va ₃ are taken into the CPU 15. The CPU 15
Depending on the magnitude of Va ₁ , | Va ₁ −Va ₂ |, the gain selector switch 31 through the output circuit 19 according to FIG.
And at the same time controlling the input selector switch 44,
_It is determined whether or not the data of _{1 to} Va ₃ is taken in. For example, as in case 1 in FIG. 11, if Va ₁ ≧ V _H , it means that the captured signal level is inappropriate, so the gain is reduced by the gain changeover switch 31 and the captured data is discarded. Then output 1 again
Take in the signal from the 7 side. As in Cases 2 and 4, | Va
_{If 1} −Va ₂ | ≧ V ₀ , the signal level may not be inadequate, but it means that pulse noise is superimposed on the signal part, so the acquired data is discarded and the output terminal Take in the signal from the 17 side again.

In case 3, since the signal level is appropriate and pulse noise is not superimposed, the input selector switch 44 is switched to the output terminal 18 side at the same time when the data is taken in. In case 5, the signal level is low, but the signal level of the output terminal 18 may be high. Therefore, data is taken in for the time being and the input changeover switch 44 is changed over to the output terminal 18 side. In cases 3 and 5, data is taken in from the output terminal 18 by the next remote control signal input. The method of taking in is the same as for the output terminal 17,
Let b ₁ , Vb ₂ , and Vb ₃ . For these data,
The CPU 15 uses the gain changeover switch 3 according to FIG.
1, input changeover switch 44, data Va _{1 to} Va ₃
Processing, and whether or not to take in Vb _{1 to} Vb ₃ is determined.
Criteria for judging these operations are the same as those when the data is fetched from the output terminal 17.

In cases 3 and 5 of FIG. 12, one set of output terminals 17 and 18 has been taken in, and the process proceeds to the next step. That is, the background noise is removed by the following equations (19) and (20). D ₁ n = (Va ₁ + Va ₂ ) / 2-Va ₃ (19) D ₂ n = (Vb ₁ + Vb ₂ ) / 2-Vb ₃ (20) Hereinafter, the same as the first embodiment. Then, the angle of arrival .theta. Of the remote control light is obtained to control the motor for rotating the controlled device.

Embodiment 3. In both the first embodiment and the second embodiment, the example in which the motor is controlled by the obtained remote control light arrival direction angle θ has been described. It can also be applied to a device that does not use a motor, such as controlling the output of or controlling the stereo phase.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an angle detection device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an electric circuit configuration of the angle detection device according to the first embodiment of the present invention.

FIG. 3 is a gain / frequency characteristic diagram illustrating a high-pass filter characteristic according to the first embodiment.

FIG. 4 is a gain / frequency characteristic diagram illustrating a low-pass filter characteristic according to the first embodiment.

FIG. 5 is a signal waveform diagram for explaining the operation of the sample hold circuit according to the first embodiment.

FIG. 6 is a signal waveform diagram illustrating the timing of sample hold in the first embodiment.

FIG. 7 is a diagram for explaining a control method of the gain switching means in the first embodiment.

FIG. 8 is a diagram for explaining two sample and hold methods according to the first embodiment.

FIG. 9 is a block diagram showing a configuration of an angle detection device according to a second embodiment of the present invention.

FIG. 10 is a diagram showing an electric circuit configuration of an angle detection device according to a second embodiment of the present invention.

FIG. 11 is a diagram for explaining a signal processing method of one output terminal of the angle detector in the second embodiment.

FIG. 12 is a diagram for explaining a signal processing method of the other output terminal of the angle detector in the second embodiment.

FIG. 13 is a diagram showing an electric circuit configuration of a conventional angle detection device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 remote control, 2 angle detector, 8 and 9 sample hold circuit, 11 angle calculation means, 22 and 23 signal processing circuit, 31 gain changeover switch, 40 light receiving section,
41 storage circuit (RAM), 42 adjustment mode switching means, 43 angle storage circuit (E ² PROM) 45, 46 band pass filter, 47, 48 amplification circuit.

Claims (9)

[Claims] 1. A step of receiving an optical signal from a remote controller to obtain a pair of electric signal outputs according to a light receiving angle of the remote controller light, and holding a sample value for the pair of electric signal outputs, The step of calculating the arrival angle of the remote control light from the sample value, the step of outputting a control signal according to two states selected by the user, and the arrival angle of the remote control light only when the control signal is in the first state The step of storing and the calculated arrival angle of the remote control light when the control signal is in the second state are corrected by the stored arrival angle in the first state to obtain a more accurate remote control light arrival angle. And a step of calculating the angle. 2. An angle detecting means for receiving an optical signal from a remote controller and obtaining a pair of electric signal outputs according to a light receiving angle of the remote controller, and sample values for the pair of electric signal outputs of the angle detecting means. Sample hold means for holding
An angle calculation means for calculating the arrival angle of the remote control light from the sample value, an adjustment mode switching means for allowing the user to select two states and outputting a control signal according to the states,
And an angle storage means for storing the arrival angle of the remote control light obtained by the angle calculation means only when the control signal and the sample hold value are input and the control signal is in the first state. In the state of 2, the arrival angle of the remote control light obtained from the angle calculation means is corrected by the value stored in the angle storage means to calculate a more accurate remote control light arrival angle. Angle detection device. 3. An angle detecting means for receiving an optical signal from a remote controller to obtain a pair of electric signal outputs according to a light receiving angle of the remote controller light, and an input switching means for switching a pair of electric signal outputs of the angle detecting means. , Sample holding means for holding a sample value for the electric signal output obtained by this input switching, angle calculating means for calculating the arrival angle of the remote control light from the sample value, the user can select one of two states, and An adjustment mode switching means for outputting a control signal in response to the control signal, and the arrival angle of the remote control light obtained by the angle calculation means only when the control signal and the sample hold value are input and the control signal is in the first state. The angle of arrival of the remote control light obtained from the angle calculating means when the control signal is in the second state. An angle detection device characterized in that a more accurate remote control light arrival angle is calculated by correcting with a value stored in a storage means. 4. The angle calculation means receives the remote control signal received by the remote control light receiving section and outputs a sample hold control signal to the sample hold means in the signal portion of the remote control signal and in the no signal portion immediately thereafter. ,
4. The difference between the sample values of the signal part and the non-signal part is obtained from the sample value obtained from the sample hold means, and the arrival angle of the remote control light is calculated from this difference. The angle detection device described. 5. The angle calculation means receives the remote control signal received by the remote control light receiving section, outputs a sample hold control signal to the sample hold means a plurality of times in the signal portion of the remote control signal, and outputs from the sample hold means. The difference between the sample values is calculated from the obtained multiple sample values.If the difference is greater than a certain value, the sample value is discarded, and if the difference is less than the certain value, the arrival angle of the remote control light is calculated using these sample values. The angle detection device according to claim 2 or 3, wherein 6. The angle calculating means is characterized by changing the amplification factor of a pair of electric signals obtained by the angle detecting means by a gain control signal obtained according to the input sample value. The angle detection device according to claim 2 or 3. 7. The angle calculating means receives sample values obtained for a plurality of remote control optical signals, performs an averaging process on the sample values or values obtained by subjecting the sample values to a constant process, and outputs the result. The angle detection device according to claim 2 or 3, wherein the arrival direction of the remote control light is calculated using the angle detection device. 8. A band pass filter for allowing only a frequency near a carrier of a remote control optical signal to pass through a pair of electric signals obtained by the angle detecting means. The angle detection device according to any one of claims. 9. The angle detecting device according to claim 3, wherein the input switching means is controlled to be switched by the angle calculating means, and the input switching is performed every time a sample value is fetched.