The filter spacing is chosen to be logarithmic above 1 kHz and the filter bandwidths are increased there as well. Mermelstein credits Bridle and Brown for the idea: Bridle and Brown used a set of 19 weighted spectrum-shape coefficients given by the cosine transform of the outputs of a set of nonuniformly spaced bandpass filters. History Paul Mermelstein is typically credited with the development of the MFC. Some researchers propose modifications to the basic MFCC algorithm to improve robustness, such as by raising the log-mel-amplitudes to a suitable power (around 2 or 3) before taking the DCT, which reduces the influence of low-energy components. Noise sensitivity MFCC values are not very robust in the presence of additive noise, and so it is common to normalise their values in speech recognition systems to lessen the influence of noise. Rather than using the VCA for gain control, the Transient Designer only affects the the shape of a signal's envelope. MFCCs are also increasingly finding uses in applications such as classification, audio similarity measures, etc. The SPL Transient Designer is a 1U 19' rackmount outboard dynamics processor with just two simple controls ( one for attack and one for sustain) of what, internally, is quite a complicated process. Applications MFCCs are commonly used as in systems, such as the systems which can automatically recognize numbers spoken into a telephone.
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