JPH01112300A - Plosive sound detector - Google Patents

Abstract

PURPOSE: To surely and simply detect a plosive at real time and to surely detect the plosive independently of the level of vocalization by measuring and processing the speed of mouth air flow. CONSTITUTION: A flow rate detecting means 1 measures the speed of an air flow generated ahead of a mouth by vocalization, a differentiating means 2 differentiates the waveform of the mouth air flow and an integrating means 3 integrates the waveform of the mouth air flow. When the output of the means 3 is large, a processing means 4 reduces the output of the means 2. Thereby a plosive can be detected at real time by the simple constitution. Since the output of the means 2 is reduced when the output of the means 3 for integrating the output signal of the means 1 is large, the plosive can be more surely detected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plosive sound detection device for detecting plosive sounds.

Conventionally, there is no known method for reliably detecting plosives from voice characteristics.

It is an object of the present invention to provide a plosive sound detection device that detects plosive sounds reliably, easily, and in real time by measuring and processing oral airflow velocity, and that also reliably detects plosive sounds regardless of the loudness of the utterance. purpose.

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

FIG. 1 is a block diagram showing an embodiment of the plosive sound detection device of the present invention. In the figure, 1 is a flow velocity detection means for detecting the oral air flow velocity, and 2 is a differentiating means for differentiating the output signal of this flow velocity detection means 1. The flow velocity detection means 1 measures the velocity of the airflow in front of the mouth caused by speech and outputs an electrical signal, and is composed of, for example, a hot wire type current meter. The differentiating means 2 is for differentiating the output signal of the flow velocity detecting means 1, that is, the so-called oral airflow waveform, and is constituted by a differentiating circuit composed of, for example, a resistor and a capacitor. Integrating means 3 for integrating the output of the flow velocity detecting means integrates the output signal of the flow velocity detecting means 1, ie, a so-called oral airflow waveform, and is constituted by an integrating circuit composed of, for example, a resistor and a capacitor.

The processing means 4 is for reducing the output of the differentiating means 2 when the output of the integrating means 3 is large, and is, for example, a variable gain amplifier circuit that changes the amplification degree for the output of the differentiating means 2 according to the output of the integrating means 3. configured.

FIG. 2 is a diagram showing signal waveforms of various parts of the plosive sound detection device shown in FIG. 1. The waveforms A, E, 2 and 5 are the first waveforms of the present invention.
These are the oral airflow waveforms and differential waveforms of plosive sounds and non-plosive sounds explained in the example. The waveform is non-plosive (q, φ, h, s, /
etc.) is uttered loudly, and waveform 2 shows the signal waveform obtained by differentiating the oral airflow waveform 1 by the differentiating means 2 at that time. Waveforms C, T, and L are integral means 3
2 shows the signal waveforms obtained by integrating the oral airflow waveforms A, E, and I, and waveforms 2, 3, and 0 show the output signal waveforms of the processing means 4.

In the above configuration, for example, when a non-plosive sound is uttered thickly (voiced), the output signal of the flow velocity detection means 1, that is, the mouth airflow waveform L, is compared to the mouth airflow waveform C when a non-plosive sound is uttered normally. As a result, the output signal of the differentiating means 2, that is, the differential signal, naturally becomes thicker. Therefore, it is of the same magnitude as the differential signal of a plosive, and it becomes difficult to distinguish between a plosive and a non-plosive by the size of the differential signal. .

On the other hand, the daily airflow waveform A, which is the output signal of the flow velocity detection means 1,
When E and R are integrated by the integrating means 3, the integrated signals of the loud non-plosive and plosive sounds become Yo and Wa, respectively.

That is, the magnitude of the integral signal at the time when the differential signal is generated is much larger for a plosive than for a plosive. Therefore, if the differential signal is processed by the processing means 4 that reduces the differential signal when the integral signal at that point is large, the output of the processing means 4 will be small as shown in the waveform (S) for a loud non-plosive sound. (For plosive sounds, it is possible to obtain a signal representing a sufficiently large plosive sound as shown in the waveform 4.) Furthermore, by adding the output of this processing means 4 to the threshold circuit,
A signal of "1" or "O" may be output depending on a plosive sound or a non-plosive sound.

It is clear that it can be detected by

As explained above, the plosive sound detection device of the present invention can detect plosive sounds in real time with a simple configuration, and when the output of the integrating means for integrating the output signal of the flow velocity detecting means is large, the differential Since a processing means for reducing the output of the means is added, plosive sounds can be detected more reliably.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a plosive sound detection device according to an embodiment of the present invention, and FIG. 2 is a signal waveform of each component of the device. 1... Flow velocity detection means, 2... Differentiating means, 3... Integrating means, 4... Processing means. Patent applicant: Director of the Agency of Industrial Science and Technology Kozo Iizuka Figure 1

Claims (1)

[Claims] flow velocity detection means for detecting oral airflow, differentiation means for differentiating the output signal of the flow velocity detection means, integration means for integrating the output signal of the flow velocity detection means, and when the output of the integration means becomes large, the differentiation means 1. A plosive sound detection device comprising processing means for reducing the output of the means, and detecting a plosive sound based on an output signal of the processing means.