JPS63141420A - Call signal receiver - Google Patents

Abstract

PURPOSE:To extend the service life of a battery by driving an amplifier of a slave station intermittently to receive a call signal from a master station so as to reduce the power consumption of the slave station. CONSTITUTION:A call signal Ca is sent continuously from a master station. On the other hand, the slave station checks the presence or absence of the call signal Ca from the master station every time a CPU 3 is operated by a timing signal St and turns off the power supply of an amplification section 2 in case of the absence and brings the CPU itself into the standby state till the next start. However, when the CPU 3 detects the presence of the signal Ca, the CPU 3 replies it to send a reception acknowledge signal Rc to supply the power supply to the amplifier section 2 continuously and proceeds the communication processing.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a mobile device that moves freely within a predetermined area and transmits predetermined data to a master station in response to paging signals continuously emitted from the master station. The present invention relates to a paging signal receiving device for a station.

[Conventional technology]

This type of receiving device generally responds to paging signals and paging commands from a master station. That is, the slave station is always in the operating state C (waiting for a call signal from the master station), receives various commands sent from the master station, and performs processing accordingly. In this case, the master station and the slave station can communicate only over a relatively short distance, that is, only when the slave station moves close to the master station and enters the communication area with the master station. Furthermore, since the slave stations can move freely within the area, they are generally configured to operate on batteries. Therefore, it is desirable that the power consumption be small, and it is particularly necessary to reduce the power consumption during normal times (while waiting for a paging signal from the master station).

[Problem that the invention seeks to solve]

To extend the communication distance, increase the gain (sensitivity) of the receiving amplifier.
However, in order to increase this gain, it is necessary to increase the current flow.

That is, when the frequency of the interrogation is low, the voltage received by the slave station decreases in proportion to the cube of the distance, so a considerable gain increase is required to extend the distance. For example, to double the communication distance (5 times), increase the gain by 8 times (
125 times). Although the power consumption of the amplifier is not as high as this, it is still a considerable multiplication factor. In this way, attempting to extend the communication distance consumes a large amount of power and significantly shortens battery life.

Therefore, it is an object of the present invention to provide a receiving device in which the battery life does not decrease much even when the communication distance is increased without increasing the number of circuit components.

[Means for solving problems]

An amplifier for receiving a calling signal from a master station, a switch for turning on and off the amplifier, and a control device for operating the switch for a predetermined time at predetermined intervals are provided.

[Effect]

The amplifier can be turned on and off by the switch, and the switch is operated by the control device for a predetermined time at predetermined intervals, thereby reducing power consumption and extending battery life.

〔Example〕

FIG. 1 is a configuration diagram showing an embodiment of this invention, and FIG.
FIG. 3 is a circuit diagram showing details of the amplifier section shown in the figure, and FIG. 3 is a timing chart for explaining the operation of FIG. 1. In the figure, 1 is a receiving antenna, 2 is an amplification section, 6 is a processing unit (CPU) such as a microcomputer, and 4 is a receiving antenna.
5 is a clock signal source for intermittent activation, and 5 is a clock signal source for CPU operation. Further, the amplifying section 2 is composed of two amplifiers, a switch 2B, etc., as shown in FIG. 2, for example.

The operation will be explained below with reference to FIG.

In the standby state, the CPU 3 stops almost all functions, and only performs a function of counting the clock from the clock signal source 4. Then, when a predetermined number of times have been counted, the original operation is started, and a control signal C is generated to drive the switch 2B shown in FIG. As a result, the amplifier 2AK power supply is applied, and the amplifying section 2 is activated.

On the other hand, the call from the master station as shown in Figure 3 (a) is sent via signal Ca.
Since this signal is sent continuously, the slave station where the CPU 3 is operating responds to this signal ca and sends out a reception confirmation signal as shown by Rc in FIG. 3(C). That is, in the slave station, the CPU 3 is activated by the timing signal Si as shown in FIG.
Each time the master station operates, the call from the master station as shown in FIG. will be in a standby state until the next activation, but if there is a signal Ca, it will respond to this by sending out a reception confirmation signal Rc and proceed to communication processing. After that, when the master station receives the reception confirmation signal Rc from the slave station, the calling station stops sending out the signal ca and sends a predetermined calling command C6 to perform normal communication processing as shown in FIG. 3 (A). In response to this command, the slave station sends response data Rd as shown in FIG. 3(c). When this communication processing is completed, the slave station returns to a communication waiting state, that is, to a mode in which it receives an interrogation signal through intermittent external activation. At this time,
A slave station that has once sent response data Rd can prevent multiple responses by, for example, detecting that the interrogation signal is once lost, or not responding until a certain period of time has elapsed. can. Which of these methods to use is determined by the required lifespan of the battery you own, in other words, how much power the slave station consumes through communication and how much this affects the battery life. be done.

〔Effect of the invention〕

According to this invention, since the amplifier is driven intermittently, it is possible to reduce the power consumption when receiving a paging signal from the master station. This has the advantage of being able to extend the communication distance over other systems.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the invention, FIG. 2 is a circuit diagram showing details of an amplifying section, and FIG. 3 is a timing chart for explaining the operation of FIG. 1. Code explanation 1... Receiving antenna, 2... Amplifying section,
2 people...Amplifier, 2B...Switch,
6... Arithmetic processing unit (CPU), 4...
・Clock signal source for intermittent startup, Clock signal source for CPU, Ca...The call is a signal, Cc.
...Call command, Rc...Reception confirmation signal, Rd...Response data, Si...
timing signal. Agent Patent Attorney Akio Namiki Agent Patent Attorney Kiyoshi Matsuzaki Figure 1

Claims (1)

[Claims] A paging signal receiving device for a slave station that moves freely within a predetermined area and transmits predetermined data to a master station in response to paging signals continuously transmitted from a master station. A calling signal receiving device comprising: an amplifier for receiving the calling signal; a switch for turning on and off the amplifier; and a control device for operating the switch for a predetermined time at predetermined time intervals.