JPH05347790A - Transmitter and receiver - Google Patents

Abstract

PURPOSE:To reduce power consumption in transmitter and receiver by an intermittent operation and to surely establish synchronism between transmission and reception. CONSTITUTION:The transmitter is provided with a timer means 4 which generates output at every certain time, an idle channel detecting means 15 which detects whether or not a reception wave is being used from a reception signal by a signal from the timer means 4, and a channel selection means 13 which changes the channel of the reception wave when the wave is being used. Also, it comprises a synchronizing signal generating means 3 which transmits a synchronizing signal when an idle channel exists, and a response detecting means 16 which performs such control to shorten the outputting period of the timer means 4 when a response signal from a communication opponent party is received and no response is received from the communication opponent party after the synchronizing signal is sent out. The recepiver is constituted so as to respond to the above mentioned operations.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitter and a receiver for transmitting and receiving data between a gas meter and various security devices and a telephone line.

[0002]

2. Description of the Related Art When using a battery as a power source for a transmitter and a receiver, it is necessary to extend the life of the battery as long as possible. Therefore, an intermittent operation method is used in which a communication state is established between the transmission device and the reception device at a predetermined time. A conventional transmitter and receiver using the intermittent operation method will be described with reference to FIGS. 4 and 5. FIG. 4 shows a transmitter,
1 is an antenna, 2 is a transmitting means, 3 is a synchronizing signal generating means,
Reference numeral 4 is a timer means, 5 is a power switch, and 6 is a battery. FIG. 6A is a timing chart of each output terminal of the transmitter of FIG. The operation of the conventional transmitter will be described with reference to FIG. The timer means 4 is shown in FIG.
As shown in (a) of the above, a pulse is output to the output terminal a at a certain time interval T, and at the same time, the switch 5 is closed to supply power to the transmitting means 2. The synchronizing signal generating means 3 has an output terminal a
The pulse signal is transmitted to the communication partner via the transmission means 2 by the pulse 1 to transmit the synchronization signal for adjusting the timer on the communication partner side on the radio wave at the timing shown in FIG. 6B. The transmission time of the synchronization signal is T1 seconds.

FIG. 5 shows a receiver, 7 is an antenna, and 8 is
Is a receiving means, 9 is a synchronizing signal detecting means, 10 is a timer means, 11 is a power switch, and 12 is a battery. Figure 6
FIG. 6B is a timing chart of each output terminal of the receiving device of FIG. The operation of the conventional receiving apparatus will be described with reference to FIG. The timer means 10 outputs a pulse to the output terminal c as shown in FIG. 6 (c), and at the same time closes the switch 11 by the signal shown in FIG. 6 (d) to supply power to the receiving means 8. The synchronization signal detecting means 9 is activated by the pulse of the output terminal c and detects the synchronization signal from the communication partner on the communication partner side. The switch 11 is kept closed because the output continues to be generated from the output terminal d of the timer means 10 until the synchronization signal is detected. When the synchronizing signal detecting means 9 detects the synchronizing signal, the signal shown in FIG. 6E is output from the output terminal e of the synchronizing signal detecting means 9. The timer means 10 is set by the signal from the terminal e and starts time measurement. And the output terminal d of the timer means 10
Output is zero. Then, after T2 seconds, the pulse is output again to the output terminal c and the output terminal d. The same operation is repeated below. That is, the pulse interval at the output terminal c of the timer means 10 is T1 + T2 = T seconds. The timing of pulse generation is always synchronized with the timer means 4 of the transmitter.

Therefore, at the timing shown in FIG. 6C, the operation state is established, and information data can be transmitted / received to / from the other party.
At other times, the power is turned off to prevent battery consumption.

[0005]

However, in the above-mentioned conventional configuration, when the radio wave is shared with another system and used, the other system is using the radio wave at the timing of transmitting the synchronization signal from the transmitter. In this case, there is a problem in that by transmitting the synchronization signal, it interferes with other systems, or collides with radio waves from other systems and the reception device cannot receive the synchronization signal.

The present invention solves the above problems and realizes a transmitter and a receiver that can share radio waves with other systems and can accurately transmit a synchronization signal to a receiver at a transmission timing. This is the purpose.

[0007]

In order to achieve the above object, a transmitting device and a receiving device of the present invention include timer means for producing an output at a certain time, and a radio wave from the outside by a signal from the timer means. Transmission / reception control means for activating receiving means for receiving, empty channel detection means for detecting whether or not a received radio wave is in use from a received signal from the receiving means, and radio wave from the empty channel detection means is in use Channel selection means for changing the channel of the received radio wave by a signal notifying that there is a signal, synchronization signal generation means activated via the transmission / reception control means by the idle channel detection signal from the idle channel detection means, and the synchronization signal generation means And a transmission means for transmitting the signal from the channel on the channel detected by the empty channel detection means. A communication device, a timer means for producing an output at a certain time, a transmission / reception control means for activating a receiving means for receiving an electric wave from the outside by a signal from the timer means, and a synchronizing signal from a received signal from the receiving means. When the sync signal is detected and there is no sync signal, the signal is output to the channel selection means for changing the channel of the received radio wave, and when the sync signal is detected, the sync signal detection means for outputting the signal for setting the timer means is formed. And a device.

[0008]

With the above structure, the present invention automatically transmits a sync signal from a transmitter through a vacant channel even when another system is using radio waves during intermittent operation, and the receiver detects the sync signal to perform an intermittent operation. The operation timing can be adjusted.

[0009]

Embodiments of the present invention will be described below with reference to FIGS. The same parts as those in the conventional example are designated by the same reference numerals. FIG. 1 shows a transmitter, 1 is an antenna, 2
Is a transmitting means, 3 is a synchronizing signal generating means, 4 is a timer means, 5 is a power switch, 6 is a battery, 13 is a channel selecting means, 14 is a receiving means, 15 is an empty channel detecting means, 16 is a response detecting means, 17 Is transmission / reception control means, 18
Is a power switch. FIG. 3A is a timing chart of each output terminal of the transmitter of FIG. The operation of the transmitting apparatus according to the embodiment will be described with reference to FIG. 3A shows a signal from the output terminal a of the timer means 4, and FIG. 3B shows a power switch 1 from the transmission / reception control means 17.
8 is a signal from the output terminal b for closing the signal, (C) is a signal from the transmission / reception control means 17 for closing the power switch 5, and (d) is a timer means from the response detecting means 16. 4 is a signal at the output terminal d for changing the timer value of No. 4. The timer means 4 outputs a pulse to the output terminal a every certain time interval T seconds or T3 seconds. The transmission / reception control means 17 closes the power switch 18 when the pulse signal shown in FIG. Then, the receiving means 14 starts operating and receives the radio wave input to the antenna 1. The channel of the received radio wave is selected by the channel selection means 13. The free channel detecting means 15 detects whether the channel selected by the channel selecting means 13 is used by another system or not used. When the channel is being used by another system, the empty channel detecting means 15 outputs a signal to the channel selecting means 13. Then, the channel selecting means 13 receives the signal for selecting the next channel according to a predetermined order, and the receiving means 1
Output to 4. The receiving means 14 receives the next channel, and the idle channel detecting means 15 detects whether the next channel selected is in use. If the channel is in use again, the next channel is selected again by the channel selection means. When a channel that is not in use is found in this way, the vacant channel detection means 15 closes the power switch 5 via the transmission / reception control means 17 and supplies power to the transmission means 2. Sync signal generating means 3
Is activated by a pulse at the output terminal C, and transmits to the communication partner a synchronization signal for adjusting the timer on the communication partner side.
The signal is transmitted by being put on an empty channel radio wave detected by the antenna 1 via. After the transmission of the synchronization signal is completed, the power switch 18 is closed again to enter the reception state. The response detecting means 16 detects a response signal confirming that the synchronization signal from the communication partner has been received. If a response signal cannot be detected, a signal is output to the output terminal d, the timer value of the timer means 4 is changed, and the pulse period output to the output terminal a is shortened to T3 seconds. When the response signal is detected, the timer means 4
Reset the timer value of and start the measurement at the original cycle T seconds. For example, T3 = T / 10 is set.
When there is data information to be sent to the communication partner, the timer means 4 is controlled so that the cycle of the output terminal a becomes T3 seconds. Then, when the power switch 5 is closed, the data information is transmitted.

FIG. 2 shows a receiver according to an embodiment of the present invention.
7 is an antenna, 8 is a receiving means, 9 is a synchronizing signal detecting means,
10 is a timer means, 11 is a power switch, 12 is a battery, 19 is a channel selecting means, 20 is a transmitting means, 21
Is a response generating means, 22 is a transmission / reception control means, 23 is a power switch, and 24 is a frequency dividing means. FIG. 3B is a timing chart of each output terminal of the receiver of FIG. The operation of the conventional receiving apparatus will be described with reference to FIG. 3B, (e) is a signal of the output terminal e of the timer means 10, (f1) is a signal of the output terminal f1 for closing the power switch 11 from the transmission / reception control means 22, and (f
2) is a signal from the output terminal f2 of the frequency dividing means 24, (g) is a signal from the output terminal g of the sync signal detecting means 9, and (h) is an output from the transmission / reception control means 22 for closing the power switch 23. This is the signal at the terminal h. The timer means 10 outputs a pulse to the output terminal e to activate the transmission / reception control means 22 as shown in FIG. Then, the transmission / reception control means 22 closes the switch 11 and supplies power to the reception means 8. Further, the synchronizing signal detecting means 9 is activated by the signal of the output terminal f2 obtained by dividing the pulse of the output terminal f1 by the dividing means 24 and starts the operation of detecting the synchronizing signal of the communicating party from the communicating party. The frequency dividing means 24 divides the frequency by, for example, 1/10. Therefore, the synchronizing signal detecting means 9 operates once while the receiving means 8 operates 10 times. When the sync signal is not detected within a certain time at the timing when the sync signal detecting means 9 operates, a signal is output to the channel selecting means 19. Then, the channel selecting means 19 outputs a signal for selecting the next channel to the receiving means 8 according to a predetermined order. The receiving means 8 receives the next channel, and the synchronizing signal detecting means 9 detects whether or not there is a synchronizing signal on the next channel. If the sync signal cannot be detected again, the channel selecting means 19 selects the next channel again. In this way, the transmission / reception control means 2 is used until the synchronization signal is detected.
Since the output continues to be generated from the second output terminal f1, the switch 11 remains closed. When the synchronizing signal detecting means 9 detects the synchronizing signal, a signal is output from the output terminal g of the synchronizing signal detecting means 9. The timer means 10 is set by the signal from the terminal g and starts time measurement. Moreover, the output of the output terminal f1 of the transmitting / receiving means 22 becomes zero, while the output terminal h
Then, the power switch 23 is closed and power is supplied to the transmitting means 20. Further, the response generation means 21 is activated by the signal of the output terminal h, and the response signal is transmitted by being carried on the radio wave of the channel in which the synchronization signal is detected. Then, after T3 seconds, a pulse is output again to the output terminal e. The same operation is repeated below. Then, the timer means 4 resynchronizes with the transmitting device every T = T3 × 10 seconds. Data information from the communication partner can be received at the timing of every T3 seconds.

As the first set channel for transmitting / receiving the synchronization signal, for example, a channel previously set between the transmitter and the receiver is used. The channel can be changed between the transmitting device and the receiving device at any time.

[0012]

As described above, according to the transmitting device and the receiving device of the present invention, a plurality of channels are used, and there is interference at the timing of transmitting a predetermined synchronization signal and the timing of transmitting the synchronization signal. Sometimes the sync signal can be sent on the next channel according to a predetermined order, so it is always possible to resynchronize between the transmitter and receiver at a predetermined cycle, and also interfere with other systems. It has the effect of never happening. Also, if the transmission device cannot receive the response signal,
Since the transmission cycle is shortened, there is an effect that resynchronization can be retaken in a short time. In this way, it is possible to realize the intermittent operation capable of ensuring the synchronization, and to extend the battery life.

[Brief description of drawings]

FIG. 1 is a block diagram of a transmission device according to an embodiment of the present invention.

FIG. 2 is a block diagram of a receiving device according to an embodiment of the present invention.

FIG. 3 is an output diagram of each output terminal in one embodiment of the present invention.

FIG. 4 is a block diagram of a conventional transmitter.

FIG. 5 is a block diagram of a conventional receiving device.

FIG. 6 is an output diagram of each output terminal in a conventional transmitter and receiver.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 antenna 2 transmitting means 3 synchronizing signal generating means 4 timer means 8 receiving means 9 synchronizing signal detecting means 10 timer means 13 channel selecting means 14 receiving means 15 empty channel detecting means 16 response detecting means 17 transmission / reception controlling means 19 channel selecting means 20 transmitting Means 21 Response generation means 22 Transmission / reception control means 24 Frequency division means

Claims (6)

[Claims] 1. A timer means for producing an output at a certain time, a transmission / reception control means for activating a receiving means for receiving a radio wave from the outside by a signal from the timer means, and a radio wave received from a signal received from the receiving means. An empty channel detecting means for detecting whether the radio wave is being used, a channel selecting means for changing the channel of the received radio wave by a signal notifying that the radio wave from the empty channel detecting means is in use, and the empty channel detecting means It is composed of a synchronization signal generating means which is activated by the idle channel detection signal from the means via the transmission / reception control means, and a transmitting means which transmits the signal from the synchronization signal generating means on the channel detected by the idle channel detecting means. Transmitter. 2. The transmission device according to claim 1, further comprising channel selection means capable of arbitrarily changing a channel selection order. 3. A timer means for producing an output at a certain time, a transmission / reception control means for activating a receiving means for receiving an electric wave from the outside by a signal from the timer means, and a synchronizing signal from the received signal from the receiving means. And outputs a signal to the channel selecting means for changing the channel of the received radio wave when there is no synchronizing signal, and a synchronizing signal detecting means for outputting a signal for setting the timer means when the synchronizing signal is detected. Receiver. 4. The receiving apparatus according to claim 3, further comprising channel selecting means capable of arbitrarily changing the order of selecting channels. 5. A timer means for producing an output at a certain time, a transmission / reception control means for activating a receiving means for receiving a radio wave from the outside by a signal from the timer means, and a radio wave received from a signal received from the receiving means. An empty channel detecting means for detecting whether the radio wave is being used, a channel selecting means for changing the channel of the received radio wave by a signal notifying that the radio wave from the empty channel detecting means is in use, and the empty channel detecting means Synchronization signal generating means activated via the transmission / reception control means by an empty channel detection signal from the means, transmitting means for transmitting the signal from the synchronization signal generating means on the channel detected by the empty channel detecting means, and the synchronization After transmitting the signal, the receiving means is activated again to respond to the synchronization signal from the communication partner. Detecting the item, sent when there is no response from the communication partner is configured by the response detection means for controlling to reduce the output period of the timer means device. 6. A timer means for producing an output at a certain time, a transmission / reception control means for activating a receiving means for receiving an electric wave from the outside by a signal from the timer means, and a synchronizing signal from a received signal from the receiving means. And a synchronizing signal detecting means for outputting a signal for setting the timer means when the synchronizing signal is detected, while outputting a signal to the channel selecting means for changing the channel of the received radio wave when the synchronizing signal is not detected. A receiving device comprising a response generating means for sending a response signal to a communication partner when the synchronization detecting signal is output from the detecting means, and a transmitting means for emitting a radio wave in a channel in which the synchronization signal is detected.