| Abstract from DBPedia | A spectrogram is a visual representation of the spectrum of frequencies of a signal as it varies with time. When applied to an audio signal, spectrograms are sometimes called sonographs, voiceprints, or voicegrams. When the data are represented in a 3D plot they may be called waterfall displays. Spectrograms are used extensively in the fields of music, linguistics, sonar, radar, speech processing, seismology, and others. Spectrograms of audio can be used to identify spoken words phonetically, and to analyse the various calls of animals. A spectrogram can be generated by an optical spectrometer, a bank of band-pass filters, by Fourier transform or by a wavelet transform (in which case it is also known as a scaleogram or scalogram). A spectrogram is usually depicted as a heat map, i.e., as an image with the intensity shown by varying the colour or brightness.スペクトログラム（英: Spectrogram）とは、複合信号を窓関数に通して、周波数スペクトルを計算した結果を指す。3次元のグラフ（時間、周波数、信号成分の強さ）で表される。 スペクトログラムは声紋の鑑定、動物の鳴き声の分析、音楽、ソナー/レーダー、音声処理などに使われている。スペクトログラムを声紋と呼ぶこともある。スペクトログラムを生成する機器をソノグラフ（sonograph）という。 (Source: http://dbpedia.org/resource/Spectrogram) |
