JPS63158923A - Individual selective calling receiver - Google Patents

Abstract

PURPOSE:To inform the drop of a power source voltage by a means comfortable for audition, by providing a melody control part which sets the output of a decoder and that of a voltage detecting part as inputs, and controls a melody generating part. CONSTITUTION:When the voltage of a power source is decreases less than a preset reference voltage, the output of the voltage detecting part goes to an H level. At this time, since its own call number is not detected, an output from the decoder is set at an L level, and as a result, the output from a melody control 105 repeats the H and the L levels. Therefore, outputted melody from a melody emitting part 106 is outputted intermittently. Next, when its own call number is received during the information of the drop of the voltage, the output of the decoder 103 goes to the H level. Consequently, the output of the control part 105 goes to the H level, and the melody is outputted without being interrupted intermittently from a speaker 108. Next, by setting the output of the decoder 103 at the L level compulsorily, the melody from the speaker is outputted as intermittent sound. Next, when the voltage drops during the outputting of continuous melody, the output of the speaker 108 outputs the intermittent sound.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an individual selective calling receiver that notifies a call by a melody, and in particular, an improved individual selective calling receiver that notifies a drop in power supply voltage by intermittent melody. Regarding the receiver.

[Conventional technology]

Conventionally, this type of individual selective call receiver has notified a call by an intermittent tone at a single audible frequency, and a drop in power supply voltage has been notified by a continuous tone at the single audible frequency. On the other hand, an individual selective call receiver having a melody call notification means has also been provided, but this also uses a single continuous audio frequency to notify of a drop in power supply voltage.

[Problem that the invention seeks to solve]

The conventional individual selective call receiver described above notifies the user of a drop in power supply voltage with a sound of a single audible frequency, which is extremely irritating to the user's hearing.

The drawback was that it was not comfortable for the person carrying it. For this reason, conventional individual selective calling receivers.

There were restrictions on the place and time of use, and this was a major obstacle to market expansion.

[Means for solving problems]

The present invention provides an individual selective call reception system having a first means for notifying a caller with a melody when receiving the own calling number, and a second means for notifying the caller when the power supply voltage drops. In the machine, the second means is a power supply voltage detection circuit, and the first means has a melody.
It is characterized in that the generation circuit is configured with a control circuit that periodically turns on and off.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 shows a block diagram of one embodiment of the invention. In the figure, 101 is an antenna, 102 is a receiving section, 103 is a decoder, 104 is a ROM for storing a calling number, 105 is a melody control section, 106 is a melody generation section, 107 is a melody amplification section, 108 is a speaker, 109 is the voltage detection section.

This will be explained in detail with reference also to FIG.

In FIG. 2, 101 to 109 are the same as those in FIG. 201 is a reset switch for stopping the call notification, 2
11 is a reference voltage generation circuit, 212 is a power source (generally using a battery), 213 is a comparator for detecting a drop in power supply voltage, 221, 224° and 227 are inverters, 222.
225 is an AND circuit.

226 is an OR circuit, and 225 is a multivibrator.

228.229 is the first. a second rising pulse generation circuit;
231 is a clock generation circuit, 232 is an address decoder, and 236 is a melody/information storage circuit (generally a ROM).
), 234 is a melody generation circuit, 265
is a low-pass filter.

The operation of this embodiment will be explained using FIGS. 2, 3, and 4.

First, notification of voltage drop will be explained.

When the voltage of the power supply 212 becomes lower than the preset voltage generated by the reference voltage generation circuit 211, the output SLVB of the comparator 213 becomes a high level (hereinafter expressed as 1H#). At this time, since the own calling number is not detected, the output 5DEC from the decoder 103 is at a low level (hereinafter referred to as "low level").

As a result, the AND circuit 222
Output SMVC! It becomes l'i"H". At the same time, the multivibrator 226 starts operating and generates a rectangular wave SMV with a constant period. The outputs SI, VB and SMV, which is an inverted signal of the output SMV, are applied to the AND circuit 225,
Furthermore, the output is applied to the OR circuit 226, and the output SMT of the OR circuit 226 becomes as shown in FIG. This output SMT is further applied to the first rising pulse generation circuit 228 and, at the same time, is inverted by the inverter 227 and applied to the second rising pulse generation circuit 229.

Output ss'r'r of first rising pulse generation circuit 228
is applied to the melody generating section 106 as a melody start signal, and is applied to the second rising pulse generating circuit 229.
The output ss'rp is applied to the melody generating section 106 as a melody stop signal. Due to the outputs ss'r'r and ss'rp, the output SMBL from the melody generating section 106 becomes an intermittent melody, as shown in FIG. The operation of the melody generating section 106 is generally well known, so a description thereof will be omitted.

Next, when a self-calling number is received while notifying a voltage drop, the output 5DEC of the decoder 103 becomes H" at the time of receiving the self-calling number. Therefore, the gate of the AND circuit 222 is closed and the output sMvc becomes 1L'', and the operation of the multivibrator 226 stops. At the same time, the output SMT of the OR circuit 226 goes @H if the previous state is "L", and continues to go "H" if @HII.

The first rising pulse generation circuit 228 according to the output SMT
As mentioned above, the shift start signal ss'r'r and the stop signal ss'rp are output from the second rising edge generation circuit 229. However, the output 5 of decoder 103
While DE(! is "H", the output SMT also does not change, so the melody is outputted from the speaker 108 without interruption, notifying the caller of the call.

Next, the output of decoder 103 is 5DBC! is decoder 10
Automatically after a certain period of time by the timer inside 6.
reset switch 2 for stopping the call notification.
By pressing 01.

The output of the decoder 103 is artificially 5DEC'k"L"
Make it. Due to this, the output SMT of the OR circuit 226
becomes "Ill L I", and the melody stops. At the same time, the output s:vvc becomes @H", the multivibrator 223 is activated again, and the output SH'r changes from "H" to "L" at a constant cycle. As a result, the start signal ss'r'r and the stop signal 5STP are alternately output, the melody is intermittent, and a voltage drop alarm is issued.

Next, an explanation will be given of the operation when a voltage drop is detected during a call notification, that is, a continuous melody is being output.

In FIG. 4, when the output 5DEO from the decoder 103 is in the state @H'', even if the output 5LVS of the voltage detection section 109 becomes H', the input of the AND circuit 222 does not contain the output 5DE.
Since the inverted signal of C is being applied, the activation signal sMvc of the multivibrator 223 does not become H" and the multivibrator 223 does not start operating. Therefore, the output SMT of the OR circuit 226 is a continuous "H" signal. A signal is output, and a call notification is performed using a continuous melody for a certain period of time.Then, the timer inside the decoder 103 outputs SDF! (resetting or resetting 3).

Output 5D by reset switch 201 for stopping call notification
Output 5DEC by resetting IO! becomes “L”, the output of the AND circuit 222, that is, the multivibrator 2
When the activation signal SMVC 23 is @H'', the multivibrator 223 outputs @H'' and @L''' signals of a constant cycle.

Therefore, as shown in FIG. 4, the output SMT of the OR circuit 226 is set to the first . Second
The rising signal generation circuit 228, 229 outputs a start signal ss'r'r and a stop signal Ss'rp, and outputs a voltage drop alarm due to intermittent melody to the speaker 108.
It will be output properly.

〔Effect of the invention〕

As explained above, the present invention has a melody control section that takes the output of the decoder and the output of the voltage detection section as inputs and controls the melody generation section, thereby suppressing a drop in the power supply voltage by intermittent melody generation. Can be notified. For this reason, 1) the present invention is able to notify the wearer of the stain source voltage drop by a means that is extremely comfortable for hearing compared to the conventional method; This has the effect of giving you greater flexibility in terms of time. In addition, there is no need for a sound generation circuit dedicated to power supply voltage drop alarms, and only the melody generator for call notification can be used to notify power supply voltage drops and call notifications, thereby reducing the size of one circuit. .

[Brief Description of the Drawings] Fig. 1 is a block diagram showing the basic configuration of the present invention, Fig. 2 is a block diagram showing an embodiment of the present invention in detail, and Figs. 3 and 4 are block diagrams showing the basic configuration of the present invention. The signal waveforms of each part of the embodiment shown in the figure are shown. Particularly, FIG. 3 shows a case where a call notification is performed during notification of a power supply voltage drop, and FIG. 4 shows a case where a power supply voltage drop is detected during a call notification. Indicates the case where 102... Receiving unit, 103... Decoder, 104...
. . . ROM for storing calling number, 105 . . . melody control unit. 106... Melody generation section, 107... Melody amplification section, 109... Voltage detection section.

Claims (1)

[Claims] 1. An individual selective calling receiver having a first means for notifying the caller with a melody when receiving the own call number, and a second means for notifying the caller when the power supply voltage drops, An individual selective call receiver characterized in that the second means comprises a power supply voltage detection circuit and a control circuit that periodically turns on and off the melody generation circuit in the first means.