JPH0442200A - Alarm sound generating device - Google Patents

Abstract

PURPOSE:To obtain an alarm sound generating device which never disorders silent environment at the time of the generation of an alarm sound by varying the acoustic level of the alarm sound by an alarm sound generator according to the level of environmental noise. CONSTITUTION:The alarm sound generator 11 when inputting an alarm contact signal 3 converts an electric vibration signal 2a into the alarm sound 6a of acoustic level corresponding to the noise level of the environment 7 detected by a microphone 8 and outputs the alarm sound 6a. Therefore, the acoustic level can be set so that the alarm sound can easily heard in the environment and the acoustic level is not too high about the noise level, thereby obtaining the device 12 which never disorders the silent environment 7 at the time of alarm sound generation.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an alarm sound generating device for use in places where the noise level of the environment changes significantly from day to night, etc., and particularly to a device that does not disturb the tranquility of the environment.

[Conventional technology]

FIG. 2 is a configuration diagram of a conventional alarm sound generating device 1. As shown in FIG. In the figure, 2 is an oscillator that outputs an electric vibration signal 2a of a predetermined frequency as an alarm sound source signal when the alarm contact signal 3 is input, and 4 is a feedback resistor 5 with a variable resistance value. A variable gain amplifier 6 is configured to amplify the electric signal 2a generated by the output signal 2a with a gain corresponding to the resistance value of the resistor 5;
The alarm sound generating device 1 is a speaker configured to emit an alarm sound 6a having an acoustic frequency equal to the frequency of the signal 4a and a sound level corresponding to the level of the signal 4a, and is composed of the above-mentioned parts.

[Problem to be solved by the invention]

Since the alarm sound generation device 1 is configured as described above, the alarm sound 6a has a sound level A corresponding to the resistance value R of the resistor 5. Therefore, in the device 1, the alarm sound level A is the same as the alarm sound 6a.
Usually, the resistance value R is set so that the sound level is such that the alarm sound can be easily heard in the environment 7 where the alarm sound is emitted. Therefore, the sound level A is set so that the alarm sound 6a can be heard during the daytime when the noise level N in the environment 7 is high.
If the alarm sound 6a is set, for example, at night when the noise level N is low, the alarm sound 6a will be heard as a sound with an abnormally high level. Therefore, the above-mentioned alarm sound generator W1 includes the alarm sound 6.
Since the sound level A of a may not be set according to the noise level N, there is a problem in that the tranquility of the environment 7 may be disturbed when the alarm sound 6a is emitted. SUMMARY OF THE INVENTION An object of the present invention is to provide an alarm sound generation device in which the sound level A is always set according to the noise level N, so that a quiet environment is not disturbed when the alarm sound is generated.

[Means to solve the problem]

In order to achieve the above object, the present invention provides an alarm sound source signal generator that generates an alarm sound source signal when an alarm signal is input, a noise detector that detects environmental noise, and a noise detector that detects environmental noise. an alarm sound generator that converts the alarm sound original signal into an alarm sound with a sound level corresponding to the level of the environmental noise detected by the noise detector and emits this alarm sound, constitutes an alarm sound generation device assuming that the alarm sound generator is the noise of the environment from which the alarm sound is emitted.

[For use]

With the above configuration, the sound level A of the alarm sound is changed by the alarm sound generator according to the level N of the environmental noise, so that the sound level A can be constantly maintained so that the alarm sound can be easily heard in the environment, and the noise level is reduced. It is possible to obtain an alarm sound generation device that can set the level to a level that is not too high with respect to the level N, and therefore does not disturb a quiet environment when emitting the alarm sound.

【Example】

FIG. 1 is a block diagram of an embodiment of the present invention, and in this figure, the same parts as in FIG. 2 are given the same reference numerals as in FIG. 2. In FIG. 1, reference numeral 8 denotes a microphone as a noise detector that detects noise in the environment 7 and outputs an analog noise signal 8a having a signal level B corresponding to the level N of this noise;
is an AD converter that constantly inputs an analog signal 8a, and when the alarm contact signal 3 is input, converts the analog value of the signal 8a at that time into a digital value, holds it, and outputs a signal 9a representing this digital value. The electric vibration signal 2a and the converter output signal 9a are inputted to the device 10, and the signal 2a
is a variable gain amplifier that amplifies the signal with a gain corresponding to the digital value represented by the signal 9a and outputs the amplified signal as 10a. It is designed to output an alarm sound 6a having the following. In FIG. 1, the AD converter 9, amplifier 10, and speaker 6 are configured as described above, so that when the alarm contact signal 3 is input, the microphone 8 detects the electric vibration signal 2a. It can be said that an alarm generator 11 is configured that converts the alarm sound 6a into an alarm sound 6a of a sound level A corresponding to the noise level N of the environment 7 and emits this alarm sound 6a. Reference numeral 12 denotes an alarm sound generating device as an embodiment of the present invention, which is composed of the various parts shown in the figure. Since the alarm sound generating device 12 is configured as described above, the sound level A of the alarm sound 6a output from the speaker 6 when the alarm contact signal 3 is inputted always automatically reaches the noise level N of the environment 7. It is clear that the alarm sound ordering device 12 has a sound level A that allows the alarm sound 6a to be easily heard in the environment 7, and that this level A is at a level corresponding to the noise level N. The amplifier 10 is adjusted so that the sound level is at a level that is not too high.
The gain has been adjusted. Therefore, in FIG. 1, it is clear that the alarm sound generating device 12 is a device that can emit the alarm sound 6a without disturbing the tranquility of the environment 7, regardless of the level of the noise level N. It is.

【Effect of the invention】

As described above, the present invention includes: an alarm sound original signal generator that generates an alarm sound original signal when an alarm signal is input;
A noise detector detects environmental noise, and when an alarm signal is input, it converts the original alarm signal into an alarm sound with a sound level corresponding to the level of the environmental noise detected by the noise detector, and emits this alarm sound. The alarm sound generator is constructed by assuming that the environmental noise is the noise of the environment from which the alarm sound generator emits the alarm sound. Therefore, with the above configuration, by changing the sound level A of the alarm sound by the alarm sound generator according to the level N of the environmental noise, the sound level A can be maintained at all times, making it possible to easily hear the alarm sound in the environment. Therefore, the present invention has the effect of providing an alarm sound generating device that does not disturb a quiet environment when emitting the alarm sound. Alarm sound, environment, microphone (noise detection)

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an embodiment of the present invention, FIG. 2 is a block diagram of a conventional alarm sound generating device.

Claims (1)

[Claims] 1) an alarm sound source signal generator that generates an alarm sound source signal when an alarm signal is input, a noise detector that detects environmental noise, and a noise detector that generates an alarm sound source signal when the alarm signal is input; an alarm sound generator that converts the environmental noise detected by the detector into an alarm sound with a sound level corresponding to the level of the environmental noise and emits the alarm sound, An alarm sound generating device characterized by emitting environmental noise.