JPS5840398B2 - Enkakuseigiyosouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a remote control device used for remote control of a television receiver, for example.

A conventional remote control device, for example, a remote control device for a television receiver, has a configuration shown in FIG.

In FIG. 1, reference numeral 1 indicates an ultrasonic microphone that receives, for example, an ultrasonic remote control signal sent from a remote location.

For simplicity, assuming that channel switching and volume adjustment are to be controlled remotely, the remote control signal should be frequency 1.
One for channel switching at frequency 1 and one for volume adjustment at frequency 12 are selected, and the two are distinguished by frequency.

Therefore, the output of the ultrasonic microphone 1 is fed to an amplifier 2, and the output of the amplifier 2 is fed to a bandpass filter 3 at a frequency of 11.
a and a bandpass filter 3b of frequency 12,
The outputs of these bandpass filters 3a and 3b are supplied to detection circuits 4a and 4b, respectively.

The output of the detection circuit 4a is directly used as one input of the AND circuit 7a, and the signal obtained by passing the output of the detection circuit 4a through the integration circuit 5a and the level detection circuit 6a is used as the other input of the AND circuit 7a. Ru.

The integration circuit 5a and the level detection circuit 6a are used to eliminate the noise of the received ultrasonic waves of frequency 11 or f2 by taking advantage of the fact that the noise normally occurs only for a very short time. It is configured as shown in FIG.

That is, the detection output shown in FIG. 3A of the detection circuit 4a is supplied to the terminal 10a, and this is integrated by the integrating circuit 5a consisting of a resistor 11 and a capacitor 12 to generate the integrated output shown in FIG. 3B.

This integrated output is applied to the base of an NPN transistor 130 whose emitter is grounded, and when the integrated output reaches 0.6 V or more, this transistor 13 is turned on.

The collector of the transistor 13 is an N whose emitter is grounded.
is connected to the base of PN type transistor 140, so that when transistor 13 is turned on, transistor 14
turns from on to off, and the terminal 15 from which the collector of the transistor 14 is led out has a time Tn of, for example, 50 ms after the output of the detection circuit 4a is generated, as shown in FIG. 3C.
An output that rises with a delay is obtained.

Now, even if noise that disappears within time Tn is received and its detected output appears from the detection circuit 4a, the transistor 13 of the level detection circuit 6a does not turn on, and the terminal 15 is at O■.

The output of this terminal 15 and the output of the detection circuit 4a are supplied to the AND circuit 7a, so when noise is received, the output of the AND circuit 7a is '0'', indicating that a regular remote control signal has been received. In this case, the output of the AND circuit 7a becomes '1' as shown in the third diagram.

The output of this AND circuit 7a serves as a control input for a pulse generator 8a configured as an unstable multivibrator, etc.
While the output of the AND circuit 7a is "1", a pulse with a period T1 of, for example, 500 is is generated at the output terminal 9a of the pulse generator 8a, as shown in FIG. 3E.

This pulse with period T1 becomes, for example, a control signal for channel switching, and channel switching is advanced by one channel each time one pulse is generated.

On the other hand, a detection circuit 4 that detects a remote control signal with a frequency of 12
Similarly, an integrating circuit 5b, a level detection circuit 6b, an AND circuit 7b, and a pulse generator 8b are connected to b.
While the output of the AND circuit 7b is "1", the pulse generator 8b
A pulse with a period T2 of, for example, 200 ms is generated at the output terminal 9b of.

This pulse controls the volume level in steps.

In the above-mentioned conventional remote control device, two pulse generators 8 a t a b are required in order to obtain two types of drive pulses each having a different period, and these are also configured as an unstable multivibrator. In this case, a large capacitor must be used, making it impossible to integrate it into an IC, and large capacitors have large capacitance errors and large capacitance changes due to temperature changes, so the oscillation period must be accurately specified. It was not possible to do so, and there were many errors.

For example, the oscillation period T of an unstable multivibrator is determined by the capacitance of the capacitor and the resistance value of the resistor that determine the period.
and R, T=0.69CR. Therefore, if T is 500m5 and R is 10kΩ, the capacitance of the capacitor will be approximately 72μF, and a relatively large capacitance capacitor will be required.

For this reason, electrolytic capacitors are generally used, but the capacitance error of electrolytic capacitors is very large, usually -10% to +50% of the rated capacity, and even those with good characteristics have ±20% error. There is an error of about %.

Further, since the error due to temperature change is large, about ±20%, both errors are compounded, and the error in the oscillation period becomes very large, which may impair the operability of remote control.

For example, the period T1 of the drive pulse for channel switching is 5
If it is significantly longer than 00 ms, it will take time to select the desired channel, and conversely, if the cycle T1 is significantly short, the channel switching speed will be too fast and the next image will be switched before the contents of the image can be confirmed. The channel is switched to.

Also, the period T2 of the drive pulse for volume level adjustment is 200
If it is much longer than ms, it will take time to reach the desired volume.

On the other hand, if the length is significantly shortened, the volume changes too quickly, making it difficult to set the desired volume.

Furthermore, when used in extremely cold regions, there is a risk that the capacitor will have a so-called capacitance drop, which may cause oscillation to stop.

Furthermore, when mass producing remote control devices to which the present invention can be applied, each device has different characteristics, which is inconvenient in terms of quality control.

Furthermore, when adding a noise removal circuit to the remote control device, the integration circuits 5a and 5b and the level detection circuit 6a
t 6 b is required, the configuration becomes complicated, and integration circuits 5a and sb are difficult to integrate into ICs.

The present invention eliminates the drawbacks of the conventional remote control device, and aims to provide a remote control device that operates accurately, has a simple configuration, and is easily integrated into an IC.

Hereinafter, one embodiment of the present invention will be described. In FIG. 4, 10a and 10b are terminals to which the detected output of the received remote control signal is supplied, as in FIG. When a remote control signal of frequency 12 is received, terminal 10a becomes 1'', and when a remote control signal of frequency 12 is received, terminal 10b becomes 11''.

Further, 16 is a reference pulse generator that generates a reference pulse of a predetermined period, for example, 17718, 17 is a 50-decimal counter, 18 is a flip-flop, 19a is a 500-decimal counter, and 19b is a 200-decimal counter.

Now, a remote control signal of frequency 11 is received and terminal 10a
Assume that the detection output shown in FIG. 5A is supplied to the detector.

The rise of this detection output resets the 500-decimal counter 19a, and the detection output is supplied to the AND circuit 21 via the OR circuit 20.

The AND circuit 21 is supplied with a period of 1 m from the reference pulse generator 16.
Since the reference pulse of s is supplied, the AND circuit 21
A reference pulse appears at the output of , as shown in FIG.

Therefore, from the 50-decimal counter 17, a pulse with a period of 507F1B is generated as shown in FIG. Thus, “OI+” becomes “1”.

The output of this flip-flop 18 (FIG. 5D) and terminal 1
The detection output from 0a (FIG. 5A) and the reference pulse are supplied to the AND circuit 22a.

The reference pulse that has passed through the AND circuit 22a is supplied to the 500-decimal counter 19a, and every time 500 reference pulses are counted, the drive pulse (carry ) appears.

Then, the detection output supplied to the terminal 10a changes from '1'' to O.
”, the flip-flop 18 is reset and 5
The supply of reference pulses to the 00-base counter 19a is stopped.

Channel switching is advanced by pulses appearing at terminal 9a with a period of 500 m5.

A specific method for this is to apply a pulse appearing at the terminal 9a to a controlled counter, for example, the shift register 24, and output terminals 25. ~25
Variable resistors 261 to 26n that determine the tuning voltage are connected to n, and a predetermined tuning voltage is sequentially generated as pulses are supplied from the terminal 9a to the shift register, and this tuning voltage is electronically transmitted. The voltage may be supplied as a bias voltage to a variable capacitance diode constituting the tuning tuner 27.

Note that the shift register 24 can also be configured with a counter and a decoder.

In addition, when the detection output of the remote control signal of frequency 12 is supplied to the terminal 10b, the flip-flop 18 is set in the same way as described above, and the reference pulse is supplied to the 200-decimal counter 19b through the AND circuit 22b, and its output As shown in FIG. 5F, a driving pulse with a period of 2007 FLS is obtained at the terminal 9b, and the volume is thereby increased or decreased in steps.

To perform volume control, the pulse appearing at terminal 9b is supplied to a controlled counter, and the output of this counter 28 is applied to the DA.
The audio signal may be converted into an analog signal by the converter 29, and this analog signal may be provided as a control input to the level control circuit 30 to change the level of the audio signal output from the level control circuit 30.

However, in reality, two types of pulses are required: one to increase the volume and one to decrease it, and these are used as the addition input and subtraction input of the reversible counter, thereby increasing or decreasing the volume. Made possible to reduce.

Further, since the Noritsubu flop 18 is set by the first pulse of the 50-decimal counter 17, its set output rises with a delay of 50 ms after the detection output is supplied to the terminal 10a or 10b.

Therefore, ultrasonic noise of frequency 2 or f2 is received,
Even if the detected output is generated at the terminal 10a or 10b, most of the noise disappears within 50 m5, so it is possible to prevent the noise from generating a pulse to be supplied to the controlled system at the terminal 9a or 9b.

According to the present invention described above, compared to the conventional remote control device shown in FIG. , for example, can be 1 ms, so if the reference pulse generator 16 is configured with an unstable multivibrator, and the resistance value is constant, the capacitance of the capacitor is 1/2
00 to 11500, making it easy to integrate into an IC.

Furthermore, even if a capacitor is attached externally, the capacitance of the capacitor becomes small, so a small and highly accurate capacitor can be used.

Note that when the required capacity is small, it is not necessary to use an electrolytic capacitor with a large error, so a highly accurate capacitor can be easily obtained and the cost is low.

Also, since the period of the reference pulse is short, the reference pulse generator 16
A crystal oscillator can be used as a oscillator, and in this case, the precision of the period of the reference pulse can be very high.

Note that if the oscillation frequency is low, for example 2Hz (=115
00ms) or 5Hz (= 1/200m
s), it cannot be directly oscillated with a crystal oscillator.

Further, since the counters 19 a and 19 b are constructed of flip-flops, they can be easily integrated into an IC, and since they can be integrated into an IC together with other circuits, the cost will not increase.

Furthermore, even when used in extremely cold regions, oscillation will not stop due to capacitance loss of the capacitor.

Furthermore, when a noise removal circuit is provided, it is not necessary to provide two integration circuits and two level detection circuits as in the conventional case, and it is sufficient to provide only a 50-decimal counter 17 and a flip-flop 18 that can be processed purely digitally. The overall circuit configuration can be simplified.

FIG. 6 shows another embodiment of the invention.

This presets the contents of the 500-decimal counter 19a to, for example, [5o] when the detection output is given to the terminal 10a, and supplies the reference pulse to the 500-decimal counter 19a as a subtraction input via the AND circuits 23 and 22a. 500
The pulse (pollow) generated when the content of the decimal counter 19a becomes [O] is obtained at the terminal 9a, and this controls channel switching, and similarly the content of the decimal counter 19b is detected and output to the terminal 10b. is given, the reference pulse is supplied to the 200-decimal counter 19b as a subtraction input via the AND circuits 23 and 22b, and the content of the 200-decimal counter 19b becomes [0].
] The pulse (hollow) that is generated when the sound is reached is obtained from the terminal 9b, and the volume is controlled using this pulse.

According to another embodiment of the present invention shown in FIG. 6, the configuration can be simplified in the same manner as described above, and a device suitable for IC implementation can be realized. 50
There is an advantage that a counter for delaying is time can be omitted.

In the above explanation, the information content of the remote control signal is two types, but the present invention is not limited to this, and the present invention can be applied to cases where there are three or more types, and the more types of information content, the better. The effect of the present invention is on dogs.

Furthermore, in the present invention, the AND circuit 22a.

22b is a reference pulse generator 16 and a counter 19a.

19b, but is not limited to this, the reference pulse generator 16 and the drive pulse output terminal 9a.

It is clear that it is sufficient if it is inserted in series with 9b.

Also, in the present invention, the output terminal 9a. Although the shift register 24 for channel selection and the counter 28 for volume adjustment are driven by the drive pulse obtained at 9b to change their states, it is necessary to drive the shift register 24 for channel selection and the counter 28 for volume adjustment. The present invention can be applied to any controlled circuit.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a conventional remote control device, Fig. 2 is a partial connection diagram thereof, Fig. 3 is a waveform diagram of each part used to explain its operation, and Fig. 4 is an implementation of the remote control device according to the present invention. The configuration diagram of the example, Figure 5 is a waveform diagram of each part used to explain its operation, and Figure 6 is a diagram of the waveform of each part used to explain its operation.
The figure is a configuration diagram of another embodiment of the present invention. 1 is an ultrasonic microphone, 4 a and 4 b are detection circuits, 5 a and 5 b are integrating circuits, 9 a and 9 b are terminals from which pulses are obtained to be supplied to the controlled system, 16 is a reference pulse generator, and 17 is a 50-decimal The counters 19a are a 500-decimal counter, and 19b are a 200-decimal counter.

Claims (1)

[Claims] 1. A receiving circuit that receives remote control signals with a plurality of information contents and selectively outputs a plurality of control signals to a plurality of output terminals according to each information content, and a pulse generator that generates a reference pulse with a predetermined period. a plurality of division counters that divide a reference pulse from the pulse generator to output a plurality of drive pulses of different periods to their respective output terminals; a plurality of counting circuits that are supplied with drive pulses from respective output terminals, whose counting contents are sequentially changed, and which generate outputs corresponding to the counting contents at each of the plurality of output terminals; and the plurality of counting circuits. a plurality of controlled devices each having a plurality of input terminals connected to a plurality of output terminals of each of the plurality of pulse generators, the state of which is changed according to inputs applied to the plurality of input terminals; a branch counter comprising a plurality of gate circuits each connected in series to a plurality of signal paths formed by the plurality of drive pulse output terminals, and each of which receives a plurality of control signals from the reception circuit as a gate signal; A remote control device configured to selectively obtain drive pulses with different periods to each output terminal of the plurality of frequency dividing circuits according to the content of the remote control signal.