Sound is the most important method of communication in our daily life. So, Speech signal processing plays an important role in modern information society. With the development of digital audio processing technology, speech technology has been widely used in real life. Voice has more advantages than other forms of interactive. Then, this technology has become increasingly close to people's lives. Therefore, spectral analysis of speech signals has important significance.
Spectrogram is a tool for speech signal analysis.It plays an important role in the speech signal analysis and processing for a long time. Spectrogram display three-dimensional form of speech signal. The basic principle is that the voice signal as a time-varying quasi-periodic signal, analyze the spectrum in each band according to the principle of voice signal short-time analysis.
This article introduces the display principle and realization of spectrogram based on Java . The spectrogram of speech signals can be done by this method . It covers the display principle of spectrogram.Fast Fourier Transform is the most important part of this article.This method can be implemented easily without camplicated programming based on universal PC.
Keywords: Spectrum Analysis, Fast Fourier Transform, Java, Recording
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