JPH05284084A - Selective calling receiver - Google Patents

Abstract

PURPOSE:To provide a selective calling receiver which can utilize batteries as efficiently as possible and also prevent missing important calls as much as possible. CONSTITUTION:When it is detected that a voltage V of a battery 7 lowered to a reference voltage VSH by a battery voltage detecting circuit 8, a control circuit 5 of a control part 100 controls a driving circuit 10 and generates a first alarm sound from a speaker 11. Subsequently, when it is detected that synchronization with a base station can not be performed by the control circuit 5 of the control part 100, the control circuit 5 of the control part 100 controls the driving circuit 10 to generate a second alarm sound from the speaker 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a selective call receiver called a so-called pager, and more particularly to improvement of functional operation when a battery voltage is low.

[0002]

2. Description of the Related Art A conventional selective call receiver of this type receives a selective call signal including individual number information transmitted from a base station, and stores the individual number information stored in a storage unit and the selective call signal. It is configured to collate with the individual number information and to perform a calling operation when the both match.

Further, since the selective call receiver of this kind is constructed by using a battery as a power source, in order to prevent the consumption of the battery as much as possible, it is constructed so as to synchronize with the base station and perform the intermittent reception. ing.

In the conventional selective call receiver, when the voltage of the battery, which is the power source, drops to a certain voltage, an alarm sound is generated to notify the voltage drop of the battery, and at the same time, the selective call signal from the base station is sent. Although it is configured to prohibit reception and prompt replacement of the battery, with such a configuration, the selective calling device cannot be used after the alarm sound is generated, so the voltage of the battery drops to a certain voltage. Also, a configuration is considered in which only the alarm sound is generated and the reception of the selective call signal from the base station is not prohibited.

However, according to this structure, the user of the selective calling device may stop the generation of the warning sound and continue to use the selective calling device as it is even if the warning sound is generated. Further, there is a problem that even if the voltage of the battery drops and the wireless circuit or the like does not operate, the user does not notice this and misses an important call depending on the case.

[0006]

As described above, in the conventional selective calling device, when the voltage of the battery, which is the power source, drops to a certain voltage, an alarm sound is generated to notify the voltage drop of the battery. If the configuration is such that the selective call signal from the base station is prohibited, the selective call device is still battery-powered even if sufficient power remains to receive and process the selective call signal from the base station. There is a problem that it can not be used unless it is replaced or charged, and even if the battery voltage drops to a certain voltage, only an alarm sound is generated,
By taking the configuration that does not prohibit the reception of the selective call signal from the base station, it is possible to stop the generation of this alarm sound and continue using the selective call device as it is.
In this case, there is a problem in that even if the wireless circuit or the like does not operate, the user does not notice this and misses an important call.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to eliminate this problem, to provide a selective call receiver which can use a battery as effectively as possible and prevent missed important calls as much as possible. And

[0008]

In order to achieve the above object, the present invention operates on a battery, receives a selective call signal including individual number information transmitted from a base station, and stores it in a storage unit. In a selective calling receiver that collates number information and individual number information in the selective calling signal and performs a calling operation when the two match, voltage detection for detecting when the voltage of the battery drops to a reference voltage Means, a first alarm generating means for generating a first alarm based on the detection output of the voltage detecting means, a synchronization monitoring means for monitoring a synchronization state with the base station, and after the first alarm is generated, the It is characterized by further comprising a second alarm generating means for generating a second alarm when the synchronization monitoring means detects that synchronization is lost.

[0009]

When the voltage detecting means detects that the battery voltage has dropped to the reference voltage, the first alarm generating means issues a first alarm, and then the synchronization monitoring means synchronizes with the base station. When it is detected that the
A second alarm is generated by the second alarm generating means. With this configuration, the selective call signal from the base station can be effectively received from the time when the first alarm is generated until the time when the second alarm sound is generated, and the battery power source is used as effectively as possible. It is possible to prevent missed important calls as much as possible.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing an embodiment of a selective call receiver according to the present invention. In FIG. 1, the radio circuit 2 receives a selective call signal transmitted from a base station (not shown) via the antenna 1. The selective calling signal includes an individual number code (hereinafter referred to as an ID code) for identifying the selective calling receiver and message information for the selective calling device.

When the radio circuit 2 receives the selective call signal, it adds the selective call signal to the demodulation circuit 3, and the demodulation circuit 3
Demodulates the selective calling signal and adds it to the control unit 100.

The control section 100 has a code control circuit 4, a control circuit 5 and a timer 9. First, under the control of the control circuit 5, an ID code is extracted from the output of the demodulation circuit 3, and this ID code is extracted. -Check whether the code matches the ID code of the own machine registered in the storage unit 14. Here, when the ID code included in the received selective calling signal matches the ID code of the own machine, the control circuit 5 controls the drive circuit 10 and the speaker 1
A ringing tone is generated from 1 and the display driving circuit 12 is controlled to display a message corresponding to the message information included in the selective calling signal on the display 13. Here, the display drive circuit 12 has, for example, a character generator, and this character generator converts the message information included in the selective calling signal into character information,
Based on this character information, a message is displayed on the display unit 13 as characters. The display 13 is composed of, for example, a liquid crystal display (LED).

The battery voltage detection circuit 8 detects the output voltage of the battery 7 which constitutes the power supply of the selective call receiver, and outputs the detected voltage to the control circuit 5 of the control unit 100.

The control circuit 5 of the control unit 100 compares the voltage V of the battery 7 detected by the battery voltage detection circuit 8 with a preset reference value VSH, and the voltage V of the battery 7 reaches the reference value VSH. When it drops (V≤VSH), the drive circuit 10 is controlled to generate the first alarm sound from the speaker 11.

Further, the control circuit 5 of the control unit 100 monitors the output of the radio circuit 2 and checks whether the operation of the radio circuit 2 is synchronized with the operation of the base station. Here, in order to prevent the battery 7 from exhausting as much as possible, the selective call receiver operates the radio circuit 2 intermittently in synchronization with the transmission cycle of the selective call signal of the base station to intermittently receive the selective call signal from the base station. It is configured to To further explain this operation, a base station (not shown) divides a plurality of selective call receivers to which selective call signals are transmitted from the base station into a plurality of groups,
It is configured to transmit a selective call signal for each group, and each selective call receiver detects the synchronization signal included in the control signal transmitted from the base station and detects the synchronization signal included in its own group. The wireless circuit of the own device is operated only during the transmission period of the selective call signal corresponding to. With such a configuration, the synchronization signal from the base station cannot be received due to the operating state of the wireless circuit of the own device, and when the synchronization with the base station is lost, the selective call signal addressed to the own device cannot be received.

Therefore, the control circuit 5 of the control unit 100 monitors the synchronization state with the base station, and when the synchronization with the base station is lost, the timer 9 is driven and the synchronization is not recovered even after a fixed time. The drive circuit 10 is controlled to generate the first alarm sound from the speaker 11.

Here, the ringing tone, the first alarm tone and the second alarm tone generated from the speaker 11 have different generation modes so that the user of this selective receiver can distinguish them. Has become. That is, the ringing sound, the first warning sound, and the second warning sound generated from the speaker 11 can be distinguished from each other by the timbre, the generation cycle, the single sound, and the continuous sound.

The operation of this embodiment will be further described with reference to the flow chart shown in FIG. 2 and the signal waveform diagram shown in FIG.

In FIG. 2, when the voltage V of the battery 7 detected by the battery voltage detection circuit 8 drops to a preset reference value VSH and V≤VSH is established (step 2
0), the control circuit 5 of the control unit 100 controls the drive circuit 10 to generate the first alarm sound from the speaker 11 (step 21).

The control circuit 5 of the control unit 100 monitors the output of the radio circuit 2, and when the radio circuit 2 is no longer in the synchronization established state (step 22), the timer 9 is started (step 23), and then the radio circuit 2 is activated. It is checked from the output of the circuit 2 whether the wireless circuit 2 is in the synchronization established state (step 24). If the wireless circuit 2 is in the synchronization established state, the process returns to step 23 and the timer 9 is restarted.
However, if it is not in the synchronization established state, it is checked next whether the timer 9 has time-over (step 25), and if it is determined that the time is over, that is, the synchronization is not established. When the state continues for the timer time of the timer 9, the control circuit 5 of the control unit 100 controls the drive circuit 10 to cause the speaker 11 to generate the second alarm sound (step 26).

That is, as shown in FIG. 3, when the voltage V of the battery 7 drops to a preset reference value VSH, a first alarm sound is generated, the voltage of the battery 7 further drops, and the synchronization is established. If the state which does not exist lasts for the timer time of the timer 9, the second alarm sound is generated.

As described above, in this embodiment, when the voltage of the battery 7 drops to the reference value VSH, the first alarm sound is generated, the voltage of the battery 7 further drops, and the timer is not in the synchronization established state. When the timer time of 9 is maintained, the first low-voltage alarm that generates the second alarm sound is sounded from the speaker. Considering replacement or charging, inform the user of the selective call receiver that the selective call receiver cannot receive the selective call signal from the base station after the second alarm sound is generated. This makes it possible to use the battery of the selective call receiver as effectively as possible and prevent missed important calls as much as possible.

In the above embodiment, the speaker 11
Although the first alarm sound and the second alarm sound are generated by the above, the first alarm sound and the second alarm sound corresponding to the first alarm sound and the second alarm sound are generated by using the notification means other than the speaker. It may be configured to notify the second alarm.

Further, in this embodiment, the timer time of the timer 9 may be arbitrarily set according to the state of the wireless line.

[0025]

As described above, according to the present invention, the first alarm is generated when the voltage of the battery drops to the first voltage, and then the second alarm is generated when the base station becomes out of synchronization. Since it is configured to be generated, it is possible to effectively receive the selective call signal from the base station from the time when the first alarm is generated until the time when the second alarm sound is generated, and to save the battery as much as possible. It is possible to effectively use it, and to prevent missed important calls as much as possible.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a selective call receiver according to the present invention.

FIG. 2 is a flowchart for explaining the operation of the embodiment shown in FIG.

FIG. 3 is a waveform diagram illustrating the operation of the embodiment shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Antenna 2 ... Radio circuit 3 ... Demodulation circuit 4 ... Code collation circuit 5 ... Control circuit 7 ... Battery 8 ... Battery voltage detection circuit 9 ... Timer 10 ... Drive circuit 11 ... Speaker 12 ... Display drive unit 13 ... Indicator 100 ... Control unit

Claims (1)

[Claims] 1. A battery-operated device, which receives a selective call signal including individual number information transmitted from a base station, and collates the individual number information stored in a storage unit with the individual number information in the selective call signal. Then, in a selective call receiver that performs a calling operation when the two match, a first voltage detection unit that detects when the voltage of the battery drops to a reference voltage and a detection output of the voltage detection unit First alarm generating means for issuing an alarm, synchronization monitoring means for monitoring the synchronization state with the base station, and when the synchronization monitoring means detects that the synchronization is lost after the first alarm is issued. A selective call receiver comprising: a second alarm generating means for generating a second alarm.