JP2583910Y2 - Sound sensing device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound sensing device for sensing a sound when air passes between a human upper jaw and a tongue, that is, a sigh sound of "sea".

[0002]

2. Description of the Related Art Conventionally, various types of sound sensing devices for sensing sounds emitted by humans are known, in which air passes between a human upper jaw and a tongue. It also includes the one for sensing the sigh of "sea". However, the configuration of these conventional circuits is complicated. In particular, the conventional circuit for detecting the exhalation sound of "sea" always performs rectification and smoothing of the detection signal.
A rectifying and smoothing circuit for the sensing signal was required.

The present invention has been made to solve the above-mentioned drawbacks of the conventional sound sensing circuit, and its object is to provide a simple structure for sound generated when air passes between a human upper jaw and a tongue. An object of the present invention is to provide a sound sensing device capable of sensing.

[0004]

Means for Achieving the Object As a means for achieving the above object, a sound sensing device according to the present invention comprises a microphone for detecting a breathing sound when air passes between a human upper jaw and a tongue. a luer <br/> pump amplifying the audio signal output from the microphone, a high pass filter for cutting a predetermined value or lower frequency of the audio signal amplified by the amplifier,
Of the audio signals that have passed through the high-pass filter,
Converts audio signals with amplitude equal to or higher than
And a comparator for waveform shaping to be changed.
The output rectangular wave is counted and set in advance within a predetermined time.
A first counter for outputting an overflow signal when a predetermined value is reached, and a preset value from the first counter.
A second counter that outputs a detection output signal when a predetermined number of overflow signals are continuously output .

[0005]

According to the sound sensing device of the present invention, as described above, the sound signal of the exhalation sound in which air passes between the upper jaw and the tongue of the human is amplified, and the amplified sound signal is amplified. after cutting a predetermined value or lower frequency of the audio signal, waveform shaping the audio signal, to create a square wave having the same frequency as the audio signal of that, to count the number of the rectangular wave, the rectangle An overflow signal is output when the number of waves exceeds a predetermined number within a predetermined time, and a detection output signal is output when the overflow signal is continuously output for a predetermined number or more. Thus, the human breath sound is detected. Therefore, a rectifying / smoothing circuit for audio signals is not required, and a human breathing sound (&#34; C ") can be detected with a circuit having a simple configuration.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a block diagram showing the configuration of a sound sensing device according to the present invention.

As shown in FIG. 1, the sound sensing device according to the present invention comprises a microphone 1 for receiving a breathing sound A when air passes between a human upper jaw and a tongue; A first amplifier 3 for amplifying the audio signal of the
Or less than the predetermined value of the audio signal from the amplifier 3 (in this case,
High pass that cuts low frequency of 4.8KHz or less)
A filter 5, and the second amplifier 7 for amplifying an audio signal of a predetermined level or higher amplitude that has passed through the high-pass filter 5, amplified certain level or higher amplitude sound than the second amplifier 7 enter the voice signal, a waveform shaping comparator 9 for outputting a rectangular wave having the same frequency as the audio signal of that counts the number of square wave from the comparator 9, the number of the rectangular wave, a predetermined Time (in this case, 50
the first month <br/> counter 11 outputs an overflow signal only if it exceeds advance-determined number (2 25) before within ms), the overflow signal from the first counter 11 are determined in advance and a second counter 13 only outputs a detection output signal when the output <br/> continuously number N or more, reset the first counter 11 every 50ms
Supply a reset signal to reset
And a time base 15 for supplying a clock having a period of 50 ms to the data 13 . Here, the second
Is an N-ary counter that can be set to 1 to 15, and N is a 4-bit dip switch 14 (see FIG.
2) can be set freely.

The first and second counters 1
The microphones 1, 13 and the time base 15 are included as a part of the microcomputer. The microphone 1, the first amplifier 3, the high-pass filter 5, the second amplifier 7, and the comparator 9 are provided around the microcomputer. It is a circuit.

Next, the operation of the above-described sound sensing device will be described.

First, a microphone 1 detects a breathing sound A in which air passes between a human upper jaw and a tongue, and a sound signal output from the microphone 1 is amplified by a first amplifier 3 and the amplified sound signal is amplified. Predetermined value (4.8K)
(Hz) or lower frequency signals are cut by the high-pass filter 5. Then, convert the low-pass frequency cut audio signal is amplified by the second amplifier 7, the rectangular wave having the same frequency as Rioto voice signal by the the amplified voice signal comparator 9 (pulse) Is done. next,
The number of the above-mentioned square waves is every 50 ms from the time base 15
255-base value reset by the reset signal output to
The first counter 11 counts, and when 225 or more pulses are counted within 50 ms, an overflow signal is output . Thus, it is possible to identify sounds of about 5 KHz or more on the principle of the frequency counter. next,
Overflow signal from the first counter 11 is counted by the second counter 13, when the overflow signal is counted consecutively N times, the detection output signal is output, whereby the human breath sounds (Where N is a dip switch 1)
4 can be set freely). Therefore, a rectifying / smoothing circuit for audio signals is not required, and a human breathing sound ("sea") can be detected with a circuit having a simple configuration.

FIG. 2 shows a specific example of the sound sensing device shown in FIG.

As shown in FIG. 2, a first circuit as a peripheral circuit
, The high-pass filter 5, the second amplifier 7, and the comparator 9 are composed of four operational amplifiers (LM3
24 etc ...) + transistor. The portion indicated by reference numeral 20 is a voice that outputs a voice using the detection output signal from the second counter 13.
It is a synthesizer unit and is not directly related to the present invention.

In the circuit of the present invention, the above-mentioned hyper
Even if the filter 5 is omitted, the treble can be identified by the first counter 11, but when the loud low sound and the low sound treble overlap each other, the high sound is generated at the peaks and troughs of the low sound waveform. The signal disappears and the sensitivity decreases.

[Brief description of the drawings]

FIG. 1 is a block diagram of a sound sensing device according to the present invention.

FIG. 2 is a specific example of the sound sensing device shown in FIG.

[Explanation of symbols]

Reference Signs List 1 microphone 3 first amplifier 5 high-pass filter 7 second amplifier 9 comparator 11 first counter 13 second counter 15 time base

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01H 3/00 A61B 5/08 G01H 3/04

Claims (1)

(57) [Scope of request for utility model registration] 1. A a microphone for detecting a breath sound when the air passes through between the upper jaw and tongue between human, is output from the microphone
A luer amplifier amplifying the audio signal, amplified by the amplifier
A high-pass filter that cuts low-frequency frequencies below a predetermined value in the processed audio signal, and passes through the high-pass filter.
Audio signal with amplitude greater than a certain level
For waveform shaping that converts
Data and the square wave output from the comparator.
A first counter for outputting an overflow signal when the value reaches a preset value within a predetermined time;
Preset number of overflow signals from the counter
Second but for outputting a detection output signal when continuously output
The sound sensing device is characterized in that a counter.