User:Leejordan9/Spectrogram
From Wikipedia, the free encyclopedia
A spectrogram is a visual way of showing all the frequencies of a signal as it changes with time. When this refers to an sound signal, spectrograms can be called sonographs, sonograms, voiceprints, or voicegrams. When the data is represented in a 3D diagram they can be called waterfall displays.
Spectrograms are used a lot in the fields of music, linguistics, sonar, radar, speech processing, seismology, ornithology, and others. Spectrograms of sounds can be used to identify spoken words using phonetics, and to analyse the noises of various animals.
A spectrogram can be created by using an optical spectrometer, a set of band-pass filters, using the Fourier transform, or by using a wavelet transform (in which case it is sometimes known as a scaleogram or scalogram).[1]
A spectrogram is usually depicted as a heat map, which shows the intensity of certain frequencies using colour or brightness.