JPS583614B2 - selective call receiving device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a selective call receiving device that generates an alarm when the voltage of a power supply drops.

A selective call receiving device that uses a battery as a power source becomes unable to perform its intended function if its power supply voltage drops.

By the way, a normal selective call receiving device only emits an audible ring tone only when its own call signal is sent from the base station, and generally cannot detect a drop in power supply voltage, and sometimes the battery is discharged. However, there is a danger of using it without knowing that the electromotive force is decreasing.

To avoid this, the selective call receiving device is equipped with a voltage drop alarm circuit.

However, when the low voltage alarm circuit operates in this way, it is normally configured to issue an audible alarm such as a continuous tone, so the selective call function will no longer work, and the call will not continue until the battery is charged or replaced. cannot be received.

In order to avoid this, a reset function is also provided for the low voltage alarm, and if the reset switch is operated while the low voltage alarm is activated, the low voltage alarm function will be disabled, and from then on, the power supply voltage will remain low and the selected recall will be performed. There are also devices that are designed to work.

However, with this device, there is a risk that once the low voltage alarm has been reset, the device may be forgotten and continued to be used without replacing the battery or the like.

The present invention eliminates the above-mentioned drawbacks, and examples thereof will be described below.

In the drawing, 1 is an antenna, 2 is a radio section for performing high frequency amplification and detection, and 3 is a decoder for identifying a calling signal, which is equipped with a reset terminal.

4, when there is an output from the decoder 3, it uses this as the first input to generate the first ringing sound (calling signal), and uses the output of the second gate (described later) as the second input to generate the second ringing sound. (alarm signal)
5 is a speaker, 6 is a detection circuit for detecting a drop in power supply voltage, 1 is a flip-flop, S is its set terminal, R is its reset terminal, and Q is its output terminal.

8 is a second gate circuit that performs an AND operation, 9 is a first gate circuit that also performs an AND operation, 10 is an OR gate for setting the flip-flop 7, and 11 outputs a power supply voltage when the switch is turned on. Reset switch, 1
2 and 13 are capacitors and resistors, 14 is a power switch, 1
5 is a battery.

Next, the operation of this embodiment will be explained.

If the electromotive force of the battery 15 is sufficient, the power switch 14
By turning on, power is supplied to each circuit, and a pulse signal is generated in a pulse generating circuit consisting of a capacitor 12 and a resistor 13.

This signal is passed through an OR gate 10 to a flip-flop 7.
Set to set state.

In this state, there is no output from the detection circuit 6, and the second gate circuit 8 is closed.

Therefore, if there is a paging signal in the signal input from the antenna 1 and received by the radio section 2, the decoder 3 detects it and generates the paging signal.

However, when the electromotive force of the battery 15 decreases, the detection circuit 6 detects this and generates a signal.

In the normal standby state, the flip-flop 7 is in the set state, so when the decoder 3 does not detect a calling signal, the second gate 8 opens and controls the sound signal generation circuit 4 to generate a continuous tone alarm signal. Occur.

This signal is added to the speaker 5 and serves as an alarm.

Note that this alarm will stop if an output is generated from the decoder 3,
A ring tone is generated instead.

When the reset switch 11 is operated while an alarm is being generated as described above, a reset signal is applied to the flip-flop via the first gate circuit 9 to reset it.

As a result, the gate 8 is closed, the voltage drop signal is cut off, and the continuous sound alarm stops.

In this state, a selective call signal is awaited.

Next, upon receiving its own selective call signal, the decoder 3 issues a signal which passes through the gate 10 and sets the flip-flop 7.

Although the voltage drop detection circuit 6 is already in the state of outputting a signal, since the gate 8 is kept closed by the signal from the decoder 3, a low voltage alarm is issued and a normal ringing tone is issued.

If the reset switch 11 is operated here (the same applies to the auto-reset function using a timer), the signal of the decoder 3 is cut off and the ringing tone is stopped.

At the same time, the second gate 8 is closed and a low voltage alarm is subsequently issued.

The decoder 3 is reset by pressing and releasing the reset switch 11 to prevent the flip-flop 7 from being reset by mistake while the ringer is ringing.

As is clear from the above embodiments, according to the present invention, even if the low voltage alarm is reset and forgotten, the low voltage alarm will be issued again when the next call signal is received, so there is a risk of forgetting to replace or charge the battery. Less sexual.

[Brief explanation of drawings]

The drawing is a wiring diagram of a receiving device according to an embodiment of the present invention. 2... Radio section, 3... Decoder, 4...
... Sound signal generation circuit, 6 ... Detection circuit, 7 ... Flip-flop, 8 ... Second gate circuit, 9 ... first gate circuit, 1
0...OR gate, 15...Power supply.

Claims (1)

[Claims] 1 A decoder with a reset terminal that detects and outputs a specific calling signal included in a received signal from the radio section; A sound generation circuit that generates a second sound in response to a signal to an input terminal, a reset switch that outputs a power supply voltage when the switch is turned on and resets the reset terminal, and a detection circuit that detects a drop in power supply voltage. and a pulse generation circuit that generates a pulse signal when the power supply voltage is turned on; the output of the decoder and the pulse generation circuit are set, and the output of the reset switch and the inverted input of the output of the decoder and the a flip-flop which is reset by the output of a first gate which takes the AND of three signals of the signals to the input terminals of No. 2; an inverted input of the decoder output; an output of the flip-flop; and an output of the detection circuit. a second AND circuit which inputs the signal and outputs the signal to the second input terminal.