JPH0785556B2 - Remote control transmitter - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote control transmission device, and more particularly to a device for intermittently transmitting data wirelessly.

2. Description of the Related Art Conventionally, when a plurality of remote control transmitters of this type (hereinafter, abbreviated as remote control transmitters) are attempted to be transmitted simultaneously, it is common to transmit data intermittently and operate on a battery. Therefore, the time of the intermittent cycle must be lengthened in order to reduce the transmission power, and the time of the intermittent cycle is generally made by dividing the internal oscillator.

However, if this intermittent cycle time is divided by a crystal or a ceramic oscillator, the oscillation accuracy is so high that if multiple remote control transmitters start transmitting at the same time. Then, the intermittent transmission data coincides for a long time and remains in collision. Therefore, there is a drawback in that the receiving side cannot receive these data.

Moreover, since this oscillator is also used as the system clock of the controller, the oscillation frequency is as high as 400 KHz to 1 MHz, and it is not suitable to keep them oscillating at all times in terms of power consumption. For example, if the device is activated by key input (that is, event input) and transmits the input data like a TV remote control, the oscillator is normally stopped and the oscillator is activated in response to the key input. By doing so, power consumption can be suppressed. However, when notifying the central processing unit of the open / closed state of windows and doors, for example, in security systems that prevent theft, such as when it is required to intermittently and repeatedly transmit already transmitted data, the state of windows and doors must be It should be sent to the central processing unit on a regular basis. If the oscillator is constantly operated to transmit such periodic interval information, useless power will be consumed.

Means for Solving the Problems That is, according to the present invention, a data input circuit for inputting data to be transmitted, a control circuit for receiving transmission data from the data input circuit and generating an output signal code, and the control circuit In a remote control transmitter having a modulation circuit for modulating the output signal code of 1. and a first oscillation circuit for outputting a system clock to the control circuit, the frequency of the system clock generated by the first oscillation circuit A second oscillating circuit that constantly oscillates to generate a clock having a sufficiently low frequency and a clock that is output from the second oscillating circuit are fixedly frequency-divided, and the frequency-divided clock is supplied to the control circuit. And a fixed frequency divider circuit for outputting, and an address input circuit for outputting an address value for determining the number of operations until the control circuit actually outputs the output. The control circuit operates intermittently every time it receives the divided clock to operate the first oscillation circuit to generate a system clock, and when the number of operations reaches the address value. There is provided a remote control transmission device characterized by outputting the output signal code from the control circuit to the modulation circuit and actually transmitting the output signal code.

Operation First, the address input circuit is preset with an address value n for setting the number of operations as the number of times of control until the remote control transmission device outputs. The clock output from the second oscillating circuit that constantly oscillates is divided by the fixed dividing circuit into a clock having a predetermined frequency. In response to the divided clock, the control circuit operates the first oscillator circuit to oscillate the system clock. In this way, the control circuit can receive and transmit the system clock output from the first oscillator circuit. The control circuit counts one each time. When the control circuit counts up to the address value n set in the address input circuit by repeating such an operation, it outputs a transmission output.

As described above, in the remote control transmitter according to the present invention, the power consumption can be reduced by intermittently driving the first oscillation circuit that oscillates the system clock and consumes a large amount of power. On the other hand, since the output interval of transmission depends on the address value, it is possible to avoid transmission collision by changing the address value n for each remote control transmission device.

Embodiment FIG. 1 shows an embodiment of the present invention. Control circuit 11 is ROM, R
It is a software-controlled controller by AM and ALU. First
The oscillating circuit 16 is an oscillating circuit of the system clock of the control circuit, and can start and stop oscillation by the output of the control circuit 11. The second oscillating circuit 15 is constantly oscillating, and a 32 KHz crystal oscillator is generally used so that the operating current is usually 10 to 30 μA or less so that it can be operated by a battery for 1 to 3 years. Therefore, the second
The oscillation circuit 15 has a low oscillation frequency and consumes less power, instead of always oscillating.

The fixed frequency dividing circuit 14 is a circuit that divides the clock of the second oscillating circuit 15 in advance, and includes 10 to 15 stages of flip-flops. The output is a clock at 100-500 ms intervals.

The control circuit 11 activates the first oscillation circuit 16 by the output of the fixed frequency dividing circuit 14 to operate the control circuit. The address input circuit 12 is a circuit for inputting a unique address number that each remote control transmitter (remote control transmission device) has, and can be set from the outside. The data input circuit 13 is data to be transmitted, and the input can also activate the control circuit.

The control circuit 11 receives the address value n from the address input circuit 12 and the data from the data input circuit 13. Further, the control circuit 11 receives the fixed frequency-divided clock from the fixed frequency dividing circuit 14, operates the first oscillation circuit 16 intermittently, and receives the system clock from the first oscillation circuit 16. Operate. As a result, the control circuit 11 with respect to the modulation circuit 17,
The transmission data to be modulated is output. The modulation circuit
Reference numeral 17 modulates the transmission data output of the control circuit 11 into FM or AM and outputs it. FIG. 3 shows an example of an output code in the case of modulation by MSK.

The operation of the present invention will be described with reference to FIG. The clock constantly oscillated by the second oscillator circuit 15 is a fixed frequency divider circuit 14
The clock is divided by 100 to 500ms. Control circuit 11
Is the first oscillator circuit in response to the divided clock.
16 is activated, and the control circuit 11 operates intermittently. This operating time is around 1ms. The frequency of the system clock oscillated by the first oscillation circuit 16 is the second
As shown in the figure, the frequency is extremely high as compared with the frequency of the clock constantly generated by the second oscillator circuit 15 (400 KHz to 1 MHz in the above-mentioned example). Therefore, the first oscillator circuit
The power consumption when the 16 is constantly oscillating is considerably larger than that of the second oscillating circuit 15.

With this configuration, the average power consumption of the remote control transmitter (remote control transmitter) is lowered to a level at which the battery can operate for 1 to 3 years.

The output interval for transmission is determined by counting the number n of operations of the control circuit 11 based on the output from the fixed frequency dividing circuit 14. If the number of times is set to be constant, if a plurality of remote control transmitters start transmission at the same time, they will always collide for a long time. Therefore, different times can be created by changing the number of operations n of the control circuit until the output is output according to the address value set from the outside.

As described above, the remote control transmitter according to the present invention has an oscillation circuit different from the oscillation circuit of the system clock used for the control circuit, and the oscillation circuit is intermittently divided by a fixed frequency division output. Since the control circuit and the system clock oscillation circuit are operated, the time until transmission is determined according to the unique address of the transmitter set by the address input circuit. This system has a remote control transmitter that is optimal for battery operation and consumes extremely little power, and has the effect that even if multiple transmitters transmit at the same time, it can be sent to the receiving side without collision.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a remote control transmission device of the present invention, FIG. 2 is a towing diagram of each part of FIG. 1, and FIG. 3 is a diagram of the embodiment of FIG. This is an example of the transmission output used, which is modulated by MSK. (Main reference numbers) 11 …… Control circuit 12 …… Address input circuit 13 …… Data input circuit 14 …… Fixed frequency divider circuit 15 …… Second oscillation circuit 16 …… First oscillation circuit 17 …… Modulation circuit

Claims (1)

[Claims] 1. A data input circuit for inputting data to be transmitted, a control circuit for receiving transmission data from the data input circuit to generate an output signal code, and a modulation circuit for modulating an output signal code from the control circuit. In the remote control transmitter having a first oscillation circuit that outputs a system clock to the control circuit, a clock having a frequency sufficiently lower than the frequency of the system clock generated by the first oscillation circuit is provided. A second oscillating circuit that constantly oscillates, a fixed frequency dividing circuit that divides the clock output from the second oscillating circuit, and outputs the divided clock to the control circuit; An address input circuit for outputting an address value that determines the number of operations until the circuit actually outputs an output, and the control circuit receives the divided clock. Each time, the control circuit intermittently operates to generate the system clock by operating the first oscillation circuit, and further, when the number of operations reaches the address value, the control circuit outputs the output to the modulation circuit. A remote control transmission device characterized by outputting a signal code and actually transmitting the signal code.