JP2001013969A - Alarm device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to change the sound volume and timbre of alarm tones in a wide range with simple constitution by making it possible to change the duty ratios of the trigger pulses outputted from a control means to an alarm means. SOLUTION: This alarm device has a microcomputer 1 which is the control means and a buzzer 2 which is the alarm means. The trigger pulses outputted from the microcomputer 1 are inputted via a resistor 3 to the base of a transistor 4. The buzzer 2 is connected together with resistors 8 and 9 to the collector of a transistor 4. The microcomputer 1 has a data table consisting of a duty ratio data table and a melody data table. The duty ratio data table is composed of correction values classified to, for example, 16 ranks, i.e., the duty ratios of the trigger pulses outputted from the microcomputer 1. The respective correction values are changeable by manipulating a first switch 6 or second switch 7. If the duty ratios are changed, the sound volume generated from the buzzer 2 increases or decreases and the timbre changes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a notification device used for electric equipment such as a rice cooker.

[0002]

2. Description of the Related Art Heretofore, there has been known a notification device such as a buzzer or a speaker used for electric equipment, which can change a volume, a pitch, and a timbre of a notification sound.

[0003] For example, an apparatus that adjusts the sound volume by using a plurality of resistors and changing the divided voltage of the resistors,
It is disclosed in JP-A-62-60523.

[0004] Japanese Patent Laid-Open No. 7-3 discloses a method of adjusting the volume and the pitch by changing the frequency of an oscillation pulse from a microcomputer (hereinafter abbreviated as a microcomputer).
No. 19477 and Japanese Utility Model Application Laid-Open No. 2-119114.

Further, Japanese Patent Application Laid-Open No. H8-188 discloses a technique in which the tone is adjusted by changing the frequency, duty ratio, and pulse width of a trigger pulse from a microcomputer.
No. 084.

[0006]

However, when changing the divided voltage, only the volume can be adjusted.
Adjustment width is narrow.

When changing the frequency of the oscillation pulse from the microcomputer, if the frequency is increased to obtain a large sound volume, a so-called chattering sound is generated, which is not suitable for the notification sound. Also, the tone cannot be adjusted.

When changing the frequency and duty ratio of the oscillation pulse from the microcomputer and the pulse width of the trigger pulse,
The tone cannot be adjusted unless a combination of the oscillation pulse and the trigger pulse is used.

Accordingly, an object of the present invention is to provide a notification device capable of changing the volume and tone of a notification sound in a wide range even with a simple configuration.

[0010]

According to the present invention, as a means for solving the above-mentioned problems, there is provided a notifying device having a notifying means for emitting a notifying sound based on a trigger pulse from the controlling means. The duty ratio of the trigger pulse output to the means can be changed.

According to this configuration, by increasing the duty ratio of the trigger pulse output from the control means to the notification means, it is possible to output a large volume from the notification means. Conversely, by reducing the duty ratio, it is possible to output a small volume from the notification means. Further, the timbre is also changed with the change of the duty ratio.

A duty ratio data table including a plurality of duty ratios of the pulse signal; and data selection means for selecting desired duty ratio data from the duty ratio data table. Call the corresponding data from the duty ratio data table based on the input signal of
What is necessary is just to output to a notification means.

[0013] The data selection means may be constituted by a jumper which can change a divided voltage obtained by a reference resistor provided on the substrate.

Further, a melody data table including various melodies may be provided, and the control means may call out corresponding data from the melody data table based on an input signal from the selection means and output the data to the notification means.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1A is a schematic diagram of a notification device according to the present embodiment. This notification device includes a microcomputer 1 as control means and a buzzer 2 as notification means. The trigger pulse output from the microcomputer 1 is input to the base of the transistor 4 via the resistor 3. Transistor 4
Are connected via a resistor 5, and the emitter is grounded. The microcomputer 1 is connected to a first switch 6 and a second switch 7 connected in parallel. The buzzer 2 is connected to the collector of the transistor 4 together with the resistors 8 and 9.

The microcomputer 1 has a data table. This data table includes a duty ratio data table and a melody data table.

As shown in FIG. 2, the duty ratio data table contains correction values classified into 16 ranks of 0 to 15, that is, the duty ratio of the trigger pulse output from the microcomputer 1 (the ratio of the ON time in one cycle). : T
on / (Ton + Toff) = 1/2 to 1/16). Each correction value can be changed by operating the first switch 6 or the second switch 7. Here, each time the first switch 6 is operated (ON) once, the duty ratio is increased by 1/2 rank, 1/3..., 1/16 by one rank, and the second switch 7 is operated once (ON). 1 each time
Decrease by rank. In FIG. 2, the resistance value, the voltage, the AD value, and the threshold value are used only in a configuration using a jumper 10 described later, and are not included in the duty ratio data table described here.

When the duty ratio is changed, the volume generated from the buzzer 2 increases and decreases and the timbre changes. It is considered that this is because the harmonic component of the generated sound changes. For example, as shown in FIGS. 1B and 1C, when the duty ratio is changed from １ ／ to １ ／, not only the fundamental wave component but also the levels of the second, third,. , The volume increases and the timbre changes.

The melody data table stores various melodies. Like the duty ratio data table, a desired melody can be selected by a switch (not shown) or the like. The melody and the duty ratio can be simultaneously selected, and a desired melody can be output at a desired volume and tone.

The notification device having the above configuration is used, for example, in a rice cooker, and is used to notify the end of rice cooking. The first switch 6 and the second switch 7 may be provided on an operation panel on the front of the rice cooker main body. By operating these switches, the user can obtain a desired volume and tone.

In the above embodiment, the first switch 6
And the second switch 7 allows the user to freely change the duty ratio.
As shown in (1), the change may be made only on the manufacturer side by exchanging a resistor connecting the jumper 10.

That is, the jumper 10 is opened,
When a short circuit or various resistors are connected to the jumper 10, a trigger pulse having a desired duty ratio is generated by comparing an AD value obtained by a divided voltage with the resistor 11 with a threshold value according to the data table of FIG. obtain. Make this setting before shipping.

The frequency of the trigger pulse from the microcomputer 1 may be changed not only by the duty ratio but also by the pitch data table shown in FIG. As a result, the sound generated from the buzzer 2 can be adjusted to a desired pitch.

[0025]

As is apparent from the above description, according to the notification device of the present invention, the duty ratio of the trigger pulse output from the control means to the notification means can be changed. This makes it possible to adjust the volume and timbre of the sound in a wide range.

[Brief description of the drawings]

FIG. 1 is a schematic diagram (a) of a notification device according to the present embodiment,
The waveform of the trigger pulse output from the microcomputer ((b): duty ratio 1/2, (c): duty ratio 1/4).

FIG. 2 is a chart showing a duty ratio data table stored in a microcomputer of FIG. 1;

FIG. 3 is a schematic diagram of a notification device according to another embodiment.

FIG. 4 is a table showing a pitch data table stored in the microcomputer of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Microcomputer 2 ... Buzzer 4 ... Transistor 6 ... First switch 7 ... Second switch 10 ... Jumper

Continuing from the front page (72) Inventor Ryuhei Hashizume 1-20-5 Tenma, Kita-ku, Osaka-shi, Osaka Elephant-in-Mahobin Co., Ltd. (72) Inventor Hidetaka Osumi 1-20-5, Tenma, Kita-ku, Osaka-shi, Osaka Elephant seal Mahobin Co., Ltd. F term (reference) 5C087 AA33 AA34 AA35 AA42 DD37 EE14 FF01 GG31 GG51 GG55 GG57

Claims (4)

[Claims] 1. A notifying device provided with notifying means for emitting a notifying sound based on a trigger pulse from a control means, wherein a duty ratio of a trigger pulse output from the control means to the notifying means can be changed. Notification device. 2. A data processing apparatus comprising: a duty ratio data table including a plurality of duty ratios of the pulse signal; and data selection means for selecting desired duty ratio data from the duty ratio data table. 2. The notification device according to claim 1, wherein the corresponding data is called from a duty ratio data table based on an input signal from the means and output to the notification means. 3. The notification device according to claim 2, wherein the data selection means is configured by a jumper that can change a divided voltage obtained by a reference resistor provided on the substrate. 4. A melody data table comprising various melodies, wherein the control means calls up corresponding data from the melody data table based on an input signal from the selection means, and outputs the data to the notifying means. The notification device according to any one of claims 1 to 3, which performs the notification.