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Difference between Linear Frequency Cepstral Coefficients and Mel-frequency cepstral

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Biruntha

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Can anyone give brief explanation about Linear Frequency Cepstral Coefficients and Mel-frequency cepstral coefficients?. Also what is the difference between them? Advantages of LFCC over MFCC?

Thankyou
 

SunnySkyguy

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The cepstrum is defined as the inverse Fourier transform of the log-magnitude Fourier spectrum. The Mel scale is roughly linear with Hertz scale to 1kHz then with increasing spacing approx. 50% per octave above this, according to human hearing perception.

The MFCC scaled filter banks then become wider at higher frequency vs equal spaced for linear filter or LFCC.

Overall, MFCC makes a better feature set as compared to cepstral coefficients ( LFCC ).

But when the speaker and listener both have stronger signals above 1kHz, then LFCC will outperform MFCC for error and recognition rates such as in women's voices.

LFCC also is slightly better with interference from mumbling noise but not with white noise.

Perhaps an adaptive method will perform better , moving somewhere between the two methods.
 

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