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Topic: Spectrogram, Cepstrum and Mel-Frequency Analysis

Speech Technology - Kishore Prahallad Technology: A Practical IntroductionTopic: Spectrogram, Cepstrum and Mel-Frequency AnalysisKishore PrahalladEmail: Mellon University&International Institute of Information Technology HyderabadSpeech Technology - Kishore Prahallad Spectrogram Cepstrum Mel-Frequency Analysis Mel-Frequency Cepstral CoefficientsSpeech Technology - Kishore Prahallad Technology - Kishore Prahallad signal represented as a sequence of spectral vectorsFFTFFTFFTS pectrumSpeech Technology - Kishore Prahallad signal represented as a sequence of spectral vectorsFFTS pectrumFFTFFTFFTFFTFFTFFTFFTFFTFFTFFTFFT FFTFFTS peech Technology - Kishore Prahallad signal represented as a

Spectral Envelope Spectrum Spectral details A pseudo-frequency axis IFFT log X[k] = log H[k] + log E[k] log H[k] log E[k] x[k] = h[k] + e[k] • x[k] is referred to as Cepstrum • h[k] is obtained by considering the low frequency region of x[k]. • h[k] represents the spectral envelope and is widely used as feature for speech recognition

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