JPH04101521A - Paging receiver - Google Patents

Abstract

PURPOSE:To automatically generate a ring tone appropriate to surrounding noise environment by variously changing the duty ratio of drive signal waveform in response to the range of change of ring tone pressure. CONSTITUTION:When receiving section 1 detects a radio individual ring tone signal sent from a base station, a control section 2 first reads a period of the content of the minimum ring tone signal waveform out of waveforms having various duty ratios stored in a waveform storage section 7, outputs to the next stage the waveforms obtained by repeating the reading a constant number of times as a drive signal, and further outputs waveforms repeating the maximum duty ratio. As a result, the drive signal is excited by a speaker excitation section 3, and finally from the speaker 4 the ring tone is generated whose average tone pressure (level) gradually increases from low ring pressure to high ring tone pressure.

Description

[Detailed Description of the Invention] [Summary] Regarding a paging receiver that can change the sound pressure of a ringing tone output from a speaker, a receiving section receives a wireless individual paging signal from a base station, and a control section receives a wireless individual paging signal from a base station. In a paging receiver that outputs a drive signal, amplifies it in the speaker excitation section, generates a ringing tone from the speaker, and stops the drive signal using a switch, the multi-stage sound appropriately corresponds to the surrounding noise environment. The waveform storage section stores one cycle of each of multiple call signal waveforms with the same frequency and different duty ratios, with the aim of realizing a compact paging receiver that can obtain pressure changes without consuming excess power. and the control unit sequentially reads out a paging signal waveform having a duty ratio from the minimum to the maximum side from the waveform storage unit when the receiving unit receives the wireless individual paging signal,
The drive signal is configured to output the drive signal which has been repeated a predetermined number of times.

Alternatively, a waveform storage unit is provided that stores one cycle of each pulse width modulated waveform of a plurality of analog waveforms having the same frequency and different maximum sound pressures as a calling signal waveform, and the control unit and the reception unit When a calling signal is received, the pulse width modulation waveforms having the smallest maximum sound pressure to the largest side are sequentially read out from the waveform storage section, and the drive signal is output after each repetition a predetermined number of times.

[Industrial application field]

The present invention relates to a paging receiver, and particularly to a paging receiver that can change the sound pressure of a ringing tone output from a speaker.

In recent years, with the spread of wireless paging systems (paging systems), there is a need for a system that can efficiently recognize the ring tone and messages of a paging receiver II (also called a pager).

Therefore, there is a need for a paging receiver that can change the sound pressure of the ringing sound to automatically generate a ringing sound that is adapted to the surrounding noise environment, and that is also smaller and consumes less power.

[Conventional technology]

A paging receiver is a small personal portable receiver in a wireless paging system, and is also commonly called a pager receiver, and is a terminal device that can generate a ringing tone (and a message).

FIG. 9 is a diagram showing a conventional example of such a paging receiver, in which 1 is a receiving section that detects a wireless individual paging signal from an input signal, and 2 is a receiving section that detects a wireless individual paging signal based on the wireless individual paging signal. 3 is a speaker excitation unit that excites the drive signal to a ring tone for the speaker 4 using a control signal; 5 is a switch for manually stopping the ring tone from the speaker 4 and switching the sound pressure; And 6 indicates a battery.

The control unit 2 also includes a paging decoder 21 that verifies wireless individual paging signals, an ID-ROM 22 that stores its own selective call number (code), and a microcomputer 23 (hereinafter referred to as , a microcomputer), and the speaker excitation unit 3 further includes a transistor TRI that is switched by a drive signal, a protection diode D1, input resistors R1 and R2, a transistor TR2 that controls sound pressure by a control signal, and a transistor TRI that is switched by a drive signal. It is composed of a resistor R3.

In the operation of such a conventional example, first, a wireless individual paging signal from a base station is detected by a receiving section 1, and then a wireless individual paging signal from a base station is detected by a receiving section 1.
ID Selective call number (code) from D-ROM 22
is read out, collation is performed by the paging decoder 21, and a match/mismatch signal is output.

Based on the matching result, the microcomputer 23 outputs a drive signal consisting of a pulse-like constant bell and a constant cycle.

Next, the drive signal causes the speaker excitation unit 3 to switch the transistor TRI, so that this switching waveform is output to the speaker 4 and is sounded as a ringing tone.

At this time, the voltage applied to the collector of the transistor TRI is normally a low voltage attenuated by the resistor R3 provided between the collector and emitter of the transistor TR2, but the voltage applied to the collector of the transistor TR2 is When the resistor R3 is short-circuited by turning on the resistor R3, the voltage becomes as high as the power supply voltage ■cc.

Therefore, the drive waveform supplied to the speaker 4 has two levels of high/low waveforms, as shown in the waveform diagrams (]) and (2) of sound pressure changes in Figure 10, and the waveforms correspond to these two levels. The ringing tone generated from the speaker 4 also has two levels of sound pressure, high and low.

The switch 5 is manually operated to output a control signal to the microcomputer 23 of the control unit 2 to instruct the switching of the sound pressure, and also to change the ringing tone (i.e., drive signal) when the ringing tone is confirmed. This is a 2-bit format that instructs to stop.

[Problem to be solved by the invention]

In such conventional paging receivers, the sound pressure of the ringing sound is changed depending on whether the voltage applied to the transistor is passed through the resistor or not in the speaker excitation unit 3. Only two-stage switching is possible, and in order to perform multi-stage sound pressure switching, it is necessary to provide many stages of control transistors and resistors, which makes the device large-scale and requires manual changes. All I can do is
■When the sound pressure of the ring tone is low, excess power is consumed by the resistor.Furthermore, ■The back electromotive force of the speaker 4 dissipates heat by the protection diode D1, resulting in excess power being consumed. There was a point.

In addition, regarding problem (2), for example, if the ringer sound pressure is set at high sound pressure with switch 5, a high sound pressure ringer suddenly sounds during a quiet meeting, etc., and disturbs the meeting. If the above situation occurs and you have set the ringing sound pressure to a low sound pressure, the ringing sound pressure will be sufficient if you are on a noisy train or in a bag or hand pack. An inconvenient situation arises in which the sound cannot be heard.

Therefore, in the present invention, the receiving section 1 receives a wireless individual paging signal from the base station, the control section 2 outputs a drive signal, the speaker excitation section 3 amplifies the signal, and then the speaker 4 generates a ringing tone. In a paging receiver that stops the drive signal using the switch 5, a multi-step sound pressure change that appropriately corresponds to the surrounding noise environment can be obtained, and there is no extra power consumption, making it possible to use a small paging receiver. The purpose is to realize this.

[Means to solve the problem]

In the present invention, when the paging receiver generates a ring tone that changes the sound pressure in a manner that adapts to the surrounding noise environment, the control unit 2 gradually increases the sound pressure (level) from a low sound pressure to a high sound pressure. We focused on the fact that if the waveform is continuously transmitted as a drive signal waveform, it can be adapted to the surrounding noise environment and unnecessary power is not consumed due to resistance in the circuit.

Hereinafter, various configurations of a paging receiver according to the present invention for achieving the above object will be explained with reference to FIG.

(1) A waveform storage section 7 is provided that stores one cycle of a plurality of calling signal waveforms having the same frequency and different duty ratios, and when the receiving section 1 receives a wireless individual paging signal, the waveform storage section 7 The call signal waveforms having a duty ratio from the minimum to the maximum ratio are sequentially read out, and each drive signal is output by repeating a predetermined number of times.

(2) A waveform storage unit 7 is provided that stores one cycle of each pulse-width modulated waveform of a plurality of analog waveforms having the same frequency and different maximum sound pressures as a calling signal waveform, and the control unit 2 and the reception unit 1 When an individual calling signal is received, the pulse width modulation waveforms having the maximum sound pressure from the minimum to the maximum are sequentially read out from the waveform storage section 7, and a drive signal which is repeated a predetermined number of times is outputted.

(3) In the present invention, in (1) or (2) above, when the control unit 2 sequentially repeats the calling signal waveform read out from the waveform storage unit 7 one cycle each and outputs it as a drive signal, each The number of repetitions can also be made variable.

(4) Furthermore, in the present invention, in any of the above (1) to (3), the control unit 2 sequentially repeats one period of each call signal waveform read out from the waveform storage unit 7 as a drive signal. When outputting, a predetermined pause period can be added between drive signals as shown in FIG. 3(2).

(5) In addition, in any of the above (1) to (4), the present invention also provides, as shown by the dotted line in FIG. A back electromotive force recovery circuit 8 for recovering power to the battery 6 can be provided.

[For production]

Hereinafter, the operation of each of the above means of the present invention shown in No. 11J will be explained.

(1) In order for the control unit 2 to generate a drive signal that gradually changes the sound pressure (level), it is necessary to
First, it may be possible to generate a waveform in which the duty ratio of the pulse signal waveform is gradually changed from the minimum to the maximum, as shown in 4).

That is, the waveform storage unit 7 stores in advance a plurality of types of calling signal waveforms each having the same repetition frequency and different duty ratios for one period.

When the receiving unit 1 detects a wireless individual paging signal from a base station, the control unit 2 selects a paging signal with the minimum duty ratio from the waveforms of various duty ratios stored in the waveform storage unit 7. One cycle of the waveform ((4) in Figure 4) is read out and the waveform ((1) in Figure 3) which is repeated a certain number of times is output as a drive signal to the next stage, and then,
In the same way, output Figure 2 (3), and then output Figure 2 (2) →
A repetitive waveform with the maximum duty ratio is output as shown in (1) in the same figure.

As a result, the drive signal is excited by the speaker excitation unit 3, and finally the speaker 4 generates a ring tone whose average sound pressure (level) gradually increases from low sound pressure to high sound pressure. Become.

Therefore, when the ambient noise is low, the ringing tone can be recognized with a low sound pressure, and when the noise is high, the ringing tone can be recognized when the sound pressure becomes high.

Note that when the ring tone gradually becomes louder in this way, when the switch 5 instructs the control section 2 to stop, the output of the drive signal from the control section 2 to the next stage is stopped, and the output of the drive signal from the control section 2 to the next stage is stopped. This means that the caller has confirmed the call.

(2) As a drive signal that can gradually increase the sound pressure, in addition to changing the duty ratio shown in Fig. 2, considering the compatibility with the speaker, Fig. 4 (2), ( 4) The waveform (+) obtained by changing the pulse width of the analog signal shown here (PWM) by 1jl (PWM), (3
) etc. may be generated by the control unit 2.

That is, the waveform storage unit 7 stores the maximum sound pressure (
A plurality of analog waveforms having different levels) are each pulse-width-modulated and stored in advance as a calling signal waveform for one period.

The calling signal waveform stored in this way is read out from the waveform storage section 7 by the control section 2 in the same manner as in (1) above.
In this case, one period of the pulse width modulation waveform corresponding to each analog signal waveform in which the maximum sound pressure (maximum amplitude in Figure 4 (2) and (4)) gradually increases from the minimum to the maximum is read out in order. That's what I do.

As a result, depending on the drive signal output from the control unit 2, a ring tone whose average sound pressure gradually increases from low sound pressure to high sound pressure is finally obtained from the speaker 4, but the drive signal in this case The signal waveform has a pulse width corresponding to the amplitude as shown in FIG. 4 (1) and (3), and is supplied as a waveform that matches the characteristics of the speaker 4, and is substantially as shown in FIG. The effective drive signal waveforms shown in (2) and (4) are obtained, and this is repeated.

(3) In addition, when the control unit 2 sequentially repeats the calling signal waveform read out from the waveform storage unit 7 one cycle each and outputs it as a drive signal, by changing the number of repetitions, it is possible to It can improve cognition.

(4) Also, when this drive signal is output,
), even if a certain pause period between different calling signal waveforms is added, the perceivability at the time of calling is similarly improved.

(5) Furthermore, in order to eliminate wasteful power consumption of the paging receiver as much as possible, the first
A back electromotive force recovery circuit 8 shown by a broken line in the figure recovers and stores a weak back electromotive force generated on the driving coil side of the speaker 4 when a ringing tone is generated in a battery 6 serving as a power source.

Therefore, by reusing this power for normal operation of the paging receiver, generation of a ring tone, etc., power efficiency can be improved.

[Embodiment] FIG. 5 is a diagram showing an embodiment of a paging receiver according to the present invention, and the basic configuration is the same as that of the conventional example shown in FIG. The structure is the same except for the circuit 8, but in this embodiment, the waveform storage section 7 uses a ROM that is connected to the control section 2 and stores one cycle of each of a plurality of call signal waveforms having different duty ratios. In addition, the control ear section 2 also performs data processing between the microcomputer 23 and the ROM 7.
A RAM 24 is used to mediate the transfer. Note that the switch 5 only stops the ringing tone.

In addition, the speaker excitation section 3 is composed of an input resistor R1, a transistor TR1 protection diode-FDI that is switched by a drive signal, and a back electromotive force recovery circuit 8 is composed of an input resistor R4, and a protection diode-FDI that is switched by a drive signal. Transistor T controlled by a control signal from the microcomputer 23
R3, and a diode D2 provided to protect the transistor TR3 from destruction.

Regarding the operation of this embodiment, the drive signal generation program/program by the microcomputer 23 of the control section 2 shown in FIG.
The explanation will be based on a flowchart. Incidentally, this program is also actually stored in the ROM 7.

First, when an output is given to the microcomputer 23 from the page decoder 21 of the control unit 2 to the effect that a local call has been detected, the microcomputer 23 converts one cycle of the waveform with the minimum duty ratio from the ROM 7 into the waveform w1 ( (see Fig. 3) (step S1 in Fig. 6), confirms that there is no stop instruction from switch 5 (step S2 in the same), repeats M times and outputs as a drive signal (step S3 in the same) . Note that FIG. 3(1) shows an example of a drive signal waveform generated with the number of repeated outputs being three times in total. These waveforms can be handled in exactly the same way even when the waveform shown in FIG. 4 is applied.

At this time, a certain pause period may be added to the drive signal as shown in FIG. 3(2) (step S4 in the same step).

Next, one cycle of the waveform with the next highest duty ratio is converted into the waveform W
2 (step S5), the above routine is repeated to output M2 times, and a pause period is provided (step 36.78).

Similarly, M is finally obtained for the waveform Wn.

These routines are repeated until the output is completed (step S9.10.11.12).

Additionally, when the operator carrying the paging receiver recognizes the call at any of the above steps,
Manually operate the switch 5 to instruct the microcomputer 23 of the control unit 2 to stop the ringer, and the microcomputer 23 then stops outputting the drive signal to the next stage and also stops reading the next waveform. .

Then, the drive signal is excited by the speaker excitation section 3,
A slightly smoothed drive waveform is applied to the speaker 4, and a ring tone whose average sound pressure gradually increases from low to high sound pressure corresponding to the duty ratio from minimum to maximum is finally obtained. .

In the above embodiment, duty ratio control is performed in accordance with FIG. 2, but the operation shown in FIG. 6 is performed in exactly the same manner in the case of the 40th pulse width modulation waveform.

FIG. 7 shows a modified example of the pulse width modulation drive signal waveform shown in FIG. The pulse width modulated pulse waveforms in (1) and (3) in the same figure have a certain pause period, and the part indicated by the broken line shows the pulse modulation waveform when the sound pressure of the original analog signal is low. There is.

In addition, (1) and (3) in the same figure show pulse 1g modulation waveforms when the sound pressure is high on the left side or both ends, respectively, and as a result, the waveforms are more suited to the characteristics of the speaker 4, and are substantially The effective drive signal waveforms are as shown in (2) and (4) in the figure.

Therefore, even with this drive signal, the speaker 4 will most importantly produce a ringing tone that gradually increases from an average sound pressure or a low sound pressure to a high sound pressure.

In the operation of the back electromotive force recovery circuit 8 in the embodiment of the present invention shown in FIG. The back electromotive force generated in the drive coil L1 of the speaker 4 at this time is switched on by the drive signal from the speaker 4, and when the transistor TR3 is turned off by the control signal, the transistor TRI is also turned off, and the diode is turned on. It is collected and stored in the battery 6 via the DI.

Therefore, by using this accumulated power again as a power source for each part of the paging receiver, power efficiency can be improved.

In addition, the 8th episode shows another embodiment of the back electromotive force recovery circuit, and in this embodiment, the drive coil L 1 of the speaker 4
A secondary coil L2 magnetically coupled is provided to form a double winding,
By causing the back electromotive force generated in the drive coil LL to generate a secondary voltage in the coil L2, the back electromotive force of the speaker 4 is similarly collected and stored in the battery 6 via the diode F'D3.

In the above embodiment, the drive coil of the speaker 4 is provided with a midpoint, and the transistor TRI in the speaker excitation section 3 is
The output circuit may be configured to be push-pull.

Furthermore, in the embodiment shown in FIG.
Although the OM is provided, in reality, the control unit 2 is generally provided with a memory in advance to realize various functions, so it can be realized by simply changing the built-in program.

(Effects of the Invention) As explained above, according to the paging receiver according to the present invention, the drive signal waveform from the control unit is set to have a different duty ratio in accordance with the change range of the ringing sound pressure. Since the configuration is configured to generate waveforms and various pulse width modulation (PWM) waveforms, it is possible to generate a multi-step ring tone with gradually increasing sound pressure (level). Since you can obtain the appropriate discharge sound that adapts to the characteristics of the speaker, you can eliminate unnecessary loud ringing sounds.
Further, it is possible to eliminate operator paging errors and realize a downsized paging receiver.

Furthermore, by collecting and reusing back electromotive force without wasting power, it is possible to realize a paging receiver with improved power efficiency.

[Brief explanation of drawings]

FIG. 1 is a principle block diagram of the paging receiver according to the present invention. FIG. 2 is a waveform diagram illustrating the sound pressure change when the duty ratio changes according to the present invention. FIG. FIG. 4 is a waveform diagram illustrating the sound pressure change when the pulse width modulation waveform changes according to the present invention. FIG. 5 is an example of the configuration of the paging receiver according to the present invention. FIG. 6 is a program flowchart of drive signal generation in the control unit used in the present invention; FIG. 7 is a diagram showing examples of drive signal waveforms using various pulse width modulation waveforms; FIG. 8 is a diagram showing an example. 9 is a diagram showing another embodiment of the back electromotive force recovery circuit, FIG. 9 is a diagram showing a conventional example, and FIG. 10 is a diagram showing a change in sound pressure of a ringing tone in the conventional example. In FIG. 1, 1... Receiving section, 2... Control section, Direction 3... Speaker excitation section, 4... Speaker, 5... Switch, 6... Battery, 7... Waveform storage unit, 8... Back electromotive force recovery circuit. In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (5)

[Claims] (1) The receiving unit (1) receives a wireless individual paging signal from the base station, the control unit (2) outputs a drive signal, amplifies it in the speaker excitation unit (3), and then calls from the speaker (4). A paging receiver that generates sound and stops the drive signal using a switch (5) is provided with a waveform storage section (7) that stores one cycle of each of a plurality of calling signal waveforms having the same frequency and different duty ratios, The control section (2) sequentially reads out the calling signal waveforms with duty ratios from the minimum to the maximum from the waveform storage section (7) when the receiving section (1) receives the wireless individual paging signal, and reads a predetermined number of calling signal waveforms from the waveform storage section (7). A paging receiver characterized in that it outputs the drive signal repeated several times. (2) The reception unit (1) receives a wireless individual paging signal from the base station, the control unit (2) outputs a drive signal, amplifies it in the speaker excitation unit (3), and then calls from the speaker (4). In a paging receiver that generates sound and stops the drive signal using a switch (5), a plurality of analog waveforms having the same frequency and different maximum sound pressures are each pulse-width modulated and used as a calling signal waveform for one cycle each. A stored waveform storage unit (7) is provided, and the control unit (2) adjusts the maximum sound pressure from the minimum to the maximum from the waveform storage unit (7) when the reception unit (1) receives the wireless individual paging signal. A paging receiver characterized in that it sequentially reads pulse width modulation waveforms up to that point and outputs the drive signals that have been repeated a predetermined number of times. (3) When the control unit (2) sequentially repeats the call signal waveform read out from the waveform storage unit (7) for one period each and outputs it as the drive signal, the number of repetitions is made variable for each. The paging receiver according to claim 1 or 2, characterized in that: (4) When the control unit (2) sequentially repeats the call signal waveform read out from the waveform storage unit (7) for one period each and outputs it as the drive signal, a predetermined pause is provided between the drive signals. 4. The paging receiver according to claim 1, further comprising a period. (5) A back electromotive force recovery circuit (8) is provided on the input side of the speaker (4) to recover the back electromotive force generated in the speaker (4) when a ringing tone is generated to the battery (6). A paging receiver according to any one of claims 1 to 4.