Calculating Delta MFCC, correct formula?

1. How do you calculate Delta MFCC?
2. What is Delta feature?
3. How many MFCC coefficients are there?
4. What is hop length in MFCC?

How do you calculate Delta MFCC?

The delta coeffients are computed using the following formula. dt=∑Nn=1n(ct+n−ct−n)2∑Nn=1n2, where dt is a delta coefficient from frame t computed in terms of the static coefficients ct−n to ct+n.

What is Delta feature?

A delta extends a river's mouth into the body of water into which it is emptying. A delta is sometimes divided into two parts: subaqueous and subaerial. The subaqueous part of a delta is underwater. This is the most steeply sloping part of the delta, and contains the finest silt.

How many MFCC coefficients are there?

Traditional MFCC systems use only 8–13 cepstral coefficients. The zeroth coefficient is often excluded since it represents the average log-energy of the input signal, which only carries little speaker-specific information.

What is hop length in MFCC?

mfcc has two arguments (which actually pass through to the underlying stft). win_length is the number of samples included in each time frame; it defaults to 2048, or ~93ms at 22 kHz SR. hop_length is the number of samples between successive windows; its default is 512, or the 23 ms you calculated.