Linear Predictive Coding - Meaning of spectrally Flat

1. What does spectrally flat mean?
2. What does linear predictive coding show?
3. Why is LPC used?
4. What is LPC speech synthesis?

What does spectrally flat mean?

Spectral flatness or tonality coefficient, also known as Wiener entropy, is a measure used in digital signal processing to characterize an audio spectrum. Spectral flatness is typically measured in decibels, and provides a way to quantify how much a sound resembles a pure tone, as opposed to being noise-like.

What does linear predictive coding show?

LPC analyzes the speech signal by estimating the formants, removing their effects from the speech signal, and estimating the intensity and frequency of the remaining buzz.

Why is LPC used?

Linear predictive coding (LPC) is a method for signal source modelling in speech signal processing. It is often used by linguists as a formant extraction tool. It has wide application in other areas. LPC analysis is usually most appropriate for modeling vowels which are periodic, except nasalized vowels.

What is LPC speech synthesis?

A popular technique used for speech analysis and synthesis is linear predictive coding (LPC). In this technique, the previous n samples of a speech signal are used to predict the next sample of the signal. The prediction error, which is the error between such a reconstructed sample and the actual sample, is minimised.