Classifying and filtering out noise from zero crossings

1. What is zero-crossing noise?
2. What does zero-crossing rate tell us?
3. What is zero-crossing in sampling?

What is zero-crossing noise?

The Zero-Crossing Rate (ZCR) of an audio frame is the rate of sign-changes of the signal during the frame. In other words, it is the number of times the signal changes value, from positive to negative and vice versa, divided by the length of the frame.

What does zero-crossing rate tell us?

The zero-crossing rate (ZCR) is the rate at which a signal changes from positive to zero to negative or from negative to zero to positive. Its value has been widely used in both speech recognition and music information retrieval, being a key feature to classify percussive sounds. is an indicator function.

What is zero-crossing in sampling?

A zero-crossing is a point where the sign of a mathematical function changes (e.g. from positive to negative), represented by an intercept of the axis (zero value) in the graph of the function. It is a commonly used term in electronics, mathematics, acoustics, and image processing.