Relative Pitch Variation Algorithm for Modification of Pitch in Emotion Conversion

This paper propose an algorithm in emotion conversion of neutral speech signal to target signals like sad speech, fear speech and anger speeches. As pitch plays an important role in emotion expression, a method called Relative pitch variation is proposed for modification of pitch contour for converting neutral speech to target emotional speech. The converted Sad, Fear and Anger speech signal are obtained by modifying prosodic parameters like pitch range, pitch frequency, energy and duration contour. The target speech is compared with resultant speech obtained by modifying only the pitch contour and also have observed the improvements in quality of expression due to modification of energy and duration.