JPH0139120B2 - - Google Patents

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 one 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
is for integrating the output signal of the flow velocity detection means 1, which is the so-called oral airflow waveform, and is constituted by an integrating circuit composed of, for example, a resistor and a capacitor. Processing means 4
is, when the output of the integrating means 3 is large, the differentiating means 2
For example, it is constructed of a variable gain amplifier circuit that changes the degree of amplification of the output of the differentiating means 2 based on the output of the integrating means 3.

FIG. 2 is a diagram showing signal waveforms of various parts of the plosive sound detection device shown in FIG. 1. Waveforms A, H, B, and F are the oral airflow waveforms and differential waveforms of the plosives and non-plosives described in the first embodiment of the present invention. The waveform 1 is the oral airflow waveform when a non-plosive sound (〓, φ, h, s, ∫, etc.) is uttered loudly, and the waveform 2 is the signal waveform obtained by differentiating the oral airflow waveform 2 using the differentiating means 2 at that time. It is something. Waveforms C, T, and L are integral means 3
shows the signal waveform obtained by integrating the oral airflow waveforms A, E, and I, and waveforms D, J, and O show the output signal waveforms of the processing means 4.

In the above configuration, for example, when a non-plosive sound is uttered loudly, the output signal of the flow velocity detection means 1,
In other words, the mouth airflow waveform C becomes larger than the mouth airflow waveform C when a non-plosive sound is normally uttered, and naturally the output signal of the differentiating means 2, that is, the differential signal also becomes larger. Therefore, the magnitude of the differential signal is the same as that of a plosive, and it becomes difficult to distinguish between a plosive and a non-plosive by the magnitude of the differential signal.

On the other hand, when the oral airflow waveforms A, E, and I, which are the output signals of the flow velocity detection means 1, are integrated by the integrating means 3, the integrated signals of the loud non-plosive sounds and the plosive sounds become Y and W, 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 for a loud non-plosive sound will be as shown in the waveform For plosive sounds, it is possible to obtain a signal representing a sufficiently large plosive sound, as shown in the waveform (G). Furthermore, this processing means 4
The output may be added to a threshold circuit to output a signal of "1" or "0" depending on a plosive sound or a non-plosive sound.

In this manner, according to the second embodiment, plosives can be reliably detected regardless of the loudness of the utterance. Moreover, it can be configured with a current meter, a simple differentiating circuit, an integrating circuit, a variable gain amplifier circuit, etc., without using complicated signal processing means. Furthermore, it is clear that detection can be performed in real time in principle.

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 drawings]

FIG. 1 is a block diagram of a plosive sound detection device according to an embodiment of the present invention, and FIG. 2 shows signal waveforms of each component of the device. 1... Flow velocity detection means, 2... Differentiating means, 3... Integrating means, 4... Processing means.

Claims (1)

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