JP2579357B2 - Remote control signal transmission / reception system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a system for transmitting and receiving a wireless remote control signal, and in particular, to a remote control signal having a configuration for synchronizing a remote controller signal transmission timing of a transmitter and an intermittent reception timing of a receiver. Related to transmission / reception systems.

(Prior art) In a system in which a remote control signal related to a command content is transmitted from a transmitter using an infrared ray, an ultrasonic wave, a radio wave, and the like, and is received by the receiver and remotely operated, the receiver is periodically operated for a short time. Japanese Patent Application Laid-Open No. 62-269427 discloses a technique for reducing the power consumption of a receiver by performing intermittent operation.

This technology sets the transmission time of the remote control signal transmitted from the transmitter to be equal to or longer than the intermittent reception cycle of the receiver, so that the transmission and reception timings of the transmitter and the receiver are asynchronous. The remote control signal is transmitted by continuously transmitting a remote control signal relating to the same command content from the transmitter.

(Problems to be Solved by the Invention) However, in the related art in which the transmission and reception timings are asynchronous, there is a problem that the power consumption of the transmitter is large and the life of the battery is short because the transmission time is long.

The present invention has been made to solve such a problem, and its purpose is to reduce the power consumption of the transmitter by shortening the transmission time by synchronizing the transmission and reception timings. The present invention provides a remote control signal transmission / reception system capable of reliably transmitting and receiving a remote control signal with a small difference in reception timing.

(Means for Solving the Problems) Means taken by the present invention to solve the problems and achieve the object are as follows.

The remote control signal transmitting / receiving system according to claim 1 of the present invention, wherein the operation command input is temporarily stored in the storage means, and the command input stored based on the transmission timing signal generated by the transmission timer means at predetermined time intervals. Signal transmission / reception system comprising a transmitter for transmitting a remote control signal related to the receiver and a receiver for performing an intermittent reception operation by a reception timer means provided in the receiver and generating a reception timing signal synchronized with the transmission timing signal , The receiver includes switch means for turning on and off power supply to a receiving circuit that amplifies and detects a received signal based on a reception timing signal generated by a reception timer means, and issues a command based on the received signal. Power saving means is provided for immediately turning off the switch means when the contents can be determined.

According to a second aspect of the present invention, in the remote control signal transmitting and receiving system according to the first aspect, the transmitter includes a command signal generating unit that repeatedly generates a command signal related to the command input a plurality of times based on the transmission timing signal. I do.

The remote control signal transmitting / receiving system according to claim 3, wherein the operation command input is temporarily stored in the storage means, and the remote control signal relating to the command input stored based on the transmission timing signal generated by the transmission timer means at predetermined time intervals is output. In a remote control signal transmitting / receiving system comprising a transmitter for transmitting and a receiver for performing a receiving operation intermittently by a receiving timer means provided in the receiver and generating a receiving timing signal synchronized with the transmitting timing signal, In the initial state after the power is turned on, the receiver is set to the continuous reception state, and from the time when the remote control signal transmitted from the transmitter is received, the receiver is switched to the intermittent reception state controlled by the reception timer means. Means are provided.

According to a fourth aspect of the present invention, in the remote control signal transmitting and receiving system according to the third aspect, the reception timer means of the receiver generates a reception timing signal from a point of time when the first remote control signal is received after power is applied to the receiver. The operation is started.

(Operation) The transmitter temporarily stores the input operation command,
The remote control signal relating to the command input is transmitted at the next transmission timing, and the receiver performs the receiving operation intermittently in accordance with the transmission timing, so that the remote control signal transmitted from the transmitter can be received and the reception can be performed. Since the power supply to the receiving circuit is stopped when the content of the command is determined from the received signal, the power consumption of the receiver can be reduced.

Further, since the transmitter repeatedly transmits the remote control signal a plurality of times, the remote control signal can be received even if the reception timing on the receiver side is slightly shifted.

Further, the receiver continues to receive continuously after the power is turned on, and switches to the intermittent reception state from the time when the first remote control signal is received, so that the timing of transmission and reception is automatically adjusted.

Note that the reception timer means of the receiver starts operation from the point of receiving the remote control signal for the first time after the power is applied to the receiver, so that it is possible to synchronize with the transmission timing means on the transmitter side with high accuracy. it can.

(Example) Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a block diagram of a remote control signal transmitting / receiving system according to the present invention, FIG. 2 is a time chart showing an operation of a transmitter of the system, and FIG. 3 is a time chart showing an operation of a receiver of the system. .

In the figure, a remote control signal transmission / reception system (hereinafter, remote control system) 10 includes a transmitter 20 and a receiver 40.

The transmitter 20 uses a battery 21 as a power source and transmits a remote control signal using infrared rays based on the operation of keys 22a and 22b for inputting operation commands.

The keys 22a and 22b are connected to the key input interface circuit 23. The key input interface circuit 23 removes chattering or the like when the keys 22a and 22b are turned on and off, and when the keys 22a and 22b are kept on for a predetermined time, the terminal 23
a, 23b to output a key input detection pulse having a pulse width longer than the transmission time tS described later, and the terminals 23a, 23b are:
It is connected to the input terminal of the storage means 24.

The storage means 24 is composed of two flip-flops (not shown) and their peripheral circuits.
When the key input detection pulse is input at the level, the corresponding flip-flop is set immediately. When the key input detection pulse is input when the reset input terminal 24c is at the H level, the reset input terminal 24c is set. After a lapse of a predetermined time after the level becomes L, the corresponding flip-flop is set. If any one of the flip-flops is set, the setting of the other flip-flop is prohibited. Each flip-flop is reset at the falling edge (H → L level) of the signal applied to the terminal 24c.

Terminals 24a and 24b are storage output (Q output of a flip-flop not shown) for storing that there is an input from the keys 22a and 22b, respectively.
An input terminal of a decoder 25a in the transmission gate 25 and an input terminal of an AND gate 26c via an OR gate 26b in the transmission timer means 26 are connected.

The transmission timer means 26 includes a transmission timing generation counter 26a, an OR gate 26b, and an AND gate 26c. The clock input terminal 26d of the transmission timer means 26 has a transmission timer clock CK obtained by dividing the oscillation output of the oscillation circuit 28 using the crystal oscillator or the ceramic oscillator 27 by the frequency divider 29.
One is given. The counter 26a outputs the transmission timing signal shown in FIG.
Output to Further, the transmission timing signal is given to the input terminal of the OR gate 25b in the command signal generating means 25 and the reset input terminal 24c of the storage means 24 via the AND gate 26c and the terminal 26f.

The synchronization timer means 30 receives the transmission timing signal output from the terminal 26e of the transmission timer means 26 as an input, outputs the synchronization timing signal shown in FIG. 2c to the terminal 30a, and transmits the command signal shown in FIG. Prohibit signal to terminal 30b
And is constituted by a counter, a decoder circuit and the like (not shown). The command signal transmission inhibition signal output to the terminal 30b is applied to the input terminal of the AND gate 26c. The synchronization timing signal output to the terminal 30a is supplied to the input terminal of the OR gate 25b and the input terminal of the decoder 25a in the command signal generating means 25.

The command signal generation means 25 includes a decoder 25a, an OR gate 25b.
And a programmable counter 25c, which also serves as a synchronizing signal generating means. Programmable counter
25c divides the command signal generation clock ck2 supplied from the frequency dividing circuit 29 by the frequency division number set by the decoder 25a while the output of the OR gate 25b is at the H level, and outputs the signal to the output terminal 25d.
Generates the command signal shown in FIG. The command signal has a different frequency in accordance with the content of the command.
The frequency fL is associated with a, the frequency fH is associated with the key 22b, and the frequency fM is associated with the synchronization command.

The command signal is input to modulation circuit 31. Modulation circuit 31
Generates a logical product output of the carrier clock CK3 supplied from the frequency dividing circuit 29 and the command signal, drives the infrared light emitting diode 33 via the driving circuit 32, and transmits a remote control signal using infrared light. I have.

 Next, the configuration of the receiver 40 will be described.

The clock CK4 for the reception timer obtained by dividing the oscillation output of the oscillation circuit 42 using the crystal or ceramic oscillator 41 by the frequency divider 43 is supplied to the clock input terminal of the reception timer means 44. The reception timer means 44 further divides the frequency of the clock CK4 and outputs a reception timing signal shown in FIG. 3B to an output terminal 44a. This reception timing signal is output from the NOR circuit in the power saving means 45 and the reception mode switching means 46. The signal is supplied to the input terminal of the switch means 47 via the gate 46a.

The switch means 47 turns on / off the power supply to the receiving circuit 49, and includes a PNP transistor 47a and a base resistor 47b. The emitter of the transistor 47a is connected to the plus terminal of the battery 48, and the collector of the transistor 47a is connected to the power supply terminal 49a of the receiving circuit 49.

The receiving circuit 49 amplifies and detects the signal received by the light receiving diode 49c to obtain a detection output.The detection output output to the terminal 49b is used as a command signal input terminal 50 of the judgment processing circuit 50.
given to a.

The determination processing circuit 50 counts the counter clock CK5 given to the clock input terminal 50b from the frequency dividing circuit 43 by a counter (not shown) during the H level or L level time or one cycle of the detection output, for example. The instruction content is determined based on the count value (based on the frequency of the detection output). When the detection processing circuit 50 detects that the frequency of the detection output is the above-mentioned fM (synchronous signal),
An H level synchronizing signal detection signal is output to 50c, and as soon as the synchronizing signal is no longer received, the terminal 50c is set to L level. When the detection processing circuit 50 detects that the frequency of the detection output is any of fL, fM, and fH, it outputs a reception completion signal having a predetermined pulse width to the terminal 50d, and the frequency of the detection output changes. Terminal 50 for fL or fH
It is configured to output an L-level power saving signal having a predetermined pulse width to e. Further, when the frequency of the detection output is fL, the judgment processing circuit 50 outputs a predetermined pulse width t2 to the terminal 50f.
If the frequency of the detection output is fH,
It is configured to output an output signal having a predetermined pulse width t3 to g.

The synchronization signal detection output terminal 50c is connected to the preset input terminal 44b of the reception timer means 44, and the reception timer means 44 outputs a signal in the reception timer means 44 when the reset input terminal 44b falls from H level to L level. The frequency dividing circuit (not shown) is configured to be preset to a predetermined count value (a value corresponding to about 1/2 of the reception time tR).

The reception completion signal output terminal 50d is connected to the reception mode switching means 46.
Connected to the reset input terminal of the flip-flop 46b.

When the battery 48 is mounted on the receiver 40 and the receiver 40 is powered on, the reception mode switching means 46 generates an initial signal for a certain period of time by the power-on initial (POI) circuit 46c, Set 46b,
The output Q is inverted by the NOR gate 46a and the switching means 47
Is turned on, the receiving circuit 49a is kept in a continuous operation state, and when a remote control signal is received even once, the flip-flop 46b is reset by a reception completion signal, and thereafter, reception is performed so as to perform an intermittent reception operation. The mode is switched.

The Q output of the flip-flop 46b of the reception mode switching means 46 is connected to the timer operation stop input terminal 44c of the reception timer means 44 via the terminal 46d. The receiving circuit 49
The detection output terminal 49b is connected to a timer start input terminal 44d of the reception timer means 44.

When the timer operation stop input terminal 44c is at the H level, the reception timer means 44 holds a frequency dividing circuit (not shown) in the reception timer means 44 in a reset state to stop the operation of the frequency dividing circuit. In this state, the timer start input pin 44
The frequency dividing circuit is configured to start the frequency dividing operation when d rises from L to H level.

The power saving signal output terminal 50e of the judgment processing circuit 50 is connected to the power saving means 4
5 and is connected to the input terminal of the AND gate 45a, the output of the AND gate 45a is set to L level by the L level power saving signal, and the power supply to the receiving circuit 49 is turned off.

The output interface circuit 51 is for interfacing an output signal (output signals of the terminals 50f and 50g) corresponding to the command input of the judgment processing circuit 50 to a controlled device (not shown), and the terminals 51a and 51b are connected to the controlled device and the like. Connection terminal.

Next, the timing of various signals and the like will be described with reference to FIGS.

As shown in FIG. 2, the synchronization T1 of the synchronization timing signal (FIG. 2c) is set to be much longer than the repetition period T0 of the transmission timing signal (FIG. 2a) (for example,
T0 = several hundred milliseconds to several seconds, T1 = several hours), the synchronization timing signal (FIG. 2c) for the H level pulse width tS (corresponding to the transmission time) of the transmission timing signal (FIG. 2c) H level pulse width tP (corresponding to synchronization signal transmission time)
Is set to be short and to output the synchronization timing signal (FIG. 2c) at the center of the pulse width tS. Also,
The command signal transmission inhibition signal (FIG. 2b) is output in synchronization with the synchronization timing signal (FIG. 2c), and the L level pulse width tI of the command signal transmission inhibition signal (FIG. 2b) is transmitted. It is set wider than the pulse width ts of the timing signal (FIG. 2a).

In this embodiment, the carrier frequency fc of the remote control signal is 35
In the range of kHz to 41 kHz, the frequency fL of the command signal related to the command input from the key 22a is 1 kHz, the frequency fH of the command signal related to the command input from the key 22b is 3 kHz, and the frequency of the command signal of the synchronization command is 2 kHz. .

As shown in FIG. 3, the period of the reception timing signal (FIG. 3b) is T0, which is the same as the period of the transmission timing signal, and the H level pulse width tR (corresponding to the reception time) of the reception timing signal is the transmission timing signal. (Fig. 2c) pulse width
It is set the same as tS (tR = tS).

Next, the operation of this system in the above configuration will be described.

When the key 22a or the key 22b is pressed at any time, the transmitter 20 causes the storage circuit 24 to temporarily store the fact that a key input has been made via the key interface circuit 23. And
The transmitter 20 provides the command signal generation circuit 25 with the storage output of the storage circuit 24 in response to the next transmission timing signal (FIG. 2a) output from the transmission timer means 26, and inputs each key input to the command signal generation circuit 25. Is continuously output during the transmission time tS (FIG. 2f), and the infrared light emitting diode 33 is driven by a logical product signal of the command signal and the carrier clock CK3. Then, a remote control signal is transmitted (FIG. 2g).

When there is no input from the keys 22a and 22b, the transmitter 20
Although the remote control signal is not transmitted even when the transmission timing of 0 arrives, at the timing of transmitting the synchronization signal of the synchronization T1 (FIG. 2C), for example, the input from the key 22b is stored in the storage circuit 24. However, the transmission of the remote control signal corresponding to the key 22b is temporarily stopped by the command signal transmission prohibition signal (FIG. 2b), the synchronization signal of the frequency fM is transmitted based on the synchronization timing signal, and at the next transmission timing. A remote control signal corresponding to the key 22b is transmitted.

 Next, the operation of the receiver 40 will be described.

When the battery 48 is provided in the receiver 40, the receiving mode switching means 46 is set to the continuous receiving mode by the operation of the power-on initial circuit 46c, and the voltage of the battery 48 is continuously applied to the receiving circuit 49.

When a remote control signal is transmitted from the transmitter 20 and this signal is received by the receiving circuit 49, the receiving timer means 44 is activated at the first rise of the detection output, and the receiving mode switching means 46 is turned on by the decision processing circuit 50. Is switched to the intermittent reception mode in response to the signal reception completion signal.

In the intermittent reception mode, the power supply to the reception circuit 49 is turned on / off based on the reception timing signal (FIG. 3B) of the reception timer means 44.

The reception timing signal (FIG. 3b) is synchronized with the transmission timing signal (FIG. 2a), receives the remote control signal transmitted from the transmitter 20, and determines based on the frequency of the command signal. Determines the contents of the command and outputs the corresponding output signal to terminals 51a and 51b.

However, since the transmitter 20 and the receiver 40 are operated by the independent oscillation circuits 28 and 42, there is a possibility that the transmission / reception timing is shifted, and the receiver 40 is transmitted from the transmitter 20. Upon receiving the synchronization signal, a synchronization signal detection signal (FIG. 3f) is generated, and the reception timer means 44 is set to a predetermined timing to synchronize the transmission and reception timings. Further, the transmitter 20 repeatedly transmits the same command signal during the transmission time tT so that the receiver 40 can receive the command content even if the timing of the transmitter is slightly shifted.
Generates a reception completion signal (FIG. 3e) at the time when the command content is determined from the received signal, turns off the power supply to the receiving circuit 49 by the power saving means 45, and reduces the power consumption time of the battery 48. Shortened.

Note that the present embodiment shows a configuration in which both the transmitter and the receiver use a general-purpose logic IC or the like, but this is merely an example, and for example, the transmitter is a CMOS chip configured with a one-chip microcomputer. The operation is controlled by software using a remote control transmission IC, and the receiver uses a remote control signal reception preamplifier IC for the reception circuit, and the other control circuit
It can be composed of a CMOS one-chip microcomputer or a gate array. In addition, the cycle, timing, and the like of various signals can be appropriately changed, the types of command signals to be transmitted and received can be expanded, and, for example, a non-contact sensor or the like other than keys can be used as the command input unit. Good.

Further, the present invention can be applied to a system using ultrasonic waves other than infrared rays, radio waves, and the like.

(Effect of the Invention) As described above in detail, the remote control signal transmission / reception system according to the present invention is configured such that the receiver performs the intermittent reception operation at the reception timing synchronized with the remote control signal transmission timing on the transmitter side. Unlike the asynchronous transmission / reception system, it is not necessary to set the transmitter transmission time longer in accordance with the intermittent reception cycle of the receiver, and the transmission time of the remote control signal can be shortened, reducing the power consumption of the transmitter The receiver stops power supply to the receiving circuit when it determines the command content from the received signal, so the power consumption of the receiver can be reduced, contributing to longer battery life and smaller battery capacity. I do. Also, even if there are multiple identical systems,
By making the transmission / reception timing different for each system, it is possible to obtain an effect that interference of remote control signals can be eliminated.

Further, since the transmitter repeatedly transmits the remote control signal a plurality of times, the remote control signal can be received even if the reception timing on the receiver side is slightly shifted.

Also, after the power is turned on, the receiver continues to receive continuously and automatically performs intermittent reception based on the remote control signal from the transmitter.Therefore, it is necessary to adjust the timing of transmission and reception when installing and replacing the battery. It is not necessary, and installation and maintenance are easy.

Furthermore, since the reception timer means of the receiver is configured to start the operation from the time of receiving the first remote control signal after the power is applied to the receiver, the effect that the reception timing can be automatically and accurately set can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram of a remote control signal transmitting / receiving system according to the present invention, FIG. 2 is a time chart showing an operation of a transmitter of the system, and FIG. 3 is a time chart showing an operation of a receiver of the system. . In the drawings, 10 is a remote control signal transmission / reception system, 20 is a transmitter, 22a and 22b are keys for inputting operation commands, 24
Is a storage means, 25 is a command signal generation means also serving as a synchronization signal generation means, 26 is a transmission timer means, 30 is a synchronization timer means, 40
Is a receiver, 44 is a reception timer means, 45 is a power saving means, 46 is a reception mode switching means, 47 is a switch means, and 50 is a judgment processing means.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Kyosuke Sakino Inventor 2-1-1, Nakajima, Kokurakita-ku, Kitakyushu-shi, Fukuoka Prefecture Totoki Co., Ltd. (56) References JP-A-60-90440 (JP, A) JP-A-63-13432 (JP, A) JP-A-62-142424 (JP, A) JP-A-62-269427 (JP, A)

Claims (4)

(57) [Claims] An operation command input is temporarily stored in a storage means.
A transmitter for transmitting a remote control signal related to a command input stored based on a transmission timing signal generated by the transmission timer means at predetermined time intervals, and a reception timing signal provided in the receiver and synchronized with the transmission timing signal In a remote control signal transmission / reception system comprising a receiver that intermittently performs a reception operation by a reception timer unit that generates a signal, the receiver transmits a received signal based on a reception timing signal generated by the reception timer unit. A switch means for turning on and off the power supply to the amplification / detection receiving circuit, and a power saving means for immediately turning off the switch means when the content of the command can be determined based on the received signal. Remote control signal transmission and reception system. 2. The remote control signal according to claim 1, wherein said transmitter includes command signal generating means for repeatedly generating a command signal relating to said command input a plurality of times based on said transmission timing signal. Transmission / reception system. 3. An operation command input is temporarily stored in a storage means.
A transmitter for transmitting a remote control signal related to a command input stored based on a transmission timing signal generated by the transmission timer means at predetermined time intervals, and a reception timing signal provided in the receiver and synchronized with the transmission timing signal In a remote control signal transmission / reception system comprising a receiver that intermittently performs a reception operation by a reception timer unit that generates, the receiver sets the receiver to a continuous reception state in an initial state after power-on, A remote control signal transmission / reception system, comprising: a reception mode switching unit that switches the receiver to an intermittent reception state controlled by the reception timer unit when a remote control signal transmitted from a transmitter is received. 4. The reception timer means of the receiver starts a timer operation for generating the reception timing signal from the time when a remote control signal is first received after power is applied to the receiver. The remote control signal transmission / reception system according to claim 3.