Lecture: Audio Features¶
After working through the material of this lecture, you should be able to answer the following questions:
- What is the relation between musical pitches and frequency?
- How can one assign a frequency range to a given musical pitch? How are a cutoff frequency and a bandwith defined?
- What is a log-frequency spectrogram? How can it be computed? (See Eq. 3.3 and Eq. 3.4.)
- What is the motivation for introducing chroma features? Which musical aspects are captured by these features?
- How can one compute chromagrams? (See Eq. 3.6.)
- What is the goal of logarithmic compression? How is it computed? (See Eq. 3.7.)
- What is the goal of feature normalization? How can it be computed? (See Eq. 3.9 and Eq. 3.10.)
- What are the effects of tuning deviations on the quality of chroma features? How may one handle such deviations?
- How can one adapt chroma features to simulate musical transpositions?