Mel spectrogram vs log mel spectrogram

1. What is a log mel spectrogram?
2. What is the difference between MFCC and Melspectrogram?
3. Is mel scale logarithmic?
4. What is log mel features?

What is a log mel spectrogram?

A mel spectrogram logarithmically renders frequencies above a certain threshold (the corner frequency). For example, in the linearly scaled spectrogram, the vertical space between 1,000 and 2,000Hz is half of the vertical space between 2,000Hz and 4,000Hz.

What is the difference between MFCC and Melspectrogram?

The mel-spectrogram is often log-scaled before. MFCC is a very compressible representation, often using just 20 or 13 coefficients instead of 32-64 bands in Mel spectrogram. The MFCC is a bit more decorrelarated, which can be beneficial with linear models like Gaussian Mixture Models.

Is mel scale logarithmic?

The mel scale is a quasi-logarithmic function of acoustic frequency designed such that perceptually similar pitch intervals (e.g. octaves) appear equal in width over the full hearing range.

What is log mel features?

Log-Mel Spectrogram features are extracted from the input audio file. The audio clip input is pre-processed with a full sampling frequency of 44,100 Hz. After getting LMS, the Gray Level Co-occurrence Matrix (GLCM) is extracted from LMS and then statistics are calculated from the GLCM.