AUDIO PROCESSOR AND METHOD OF PROCESSING SOUND WITH HIGH-QUALITY CORRECTION OF BASE FREQUENCY (VERSIONS) Russian patent published in 2011 - IPC G10L19/02 

FIELD: information technology.

SUBSTANCE: presentation of the digital form of an audio signal consisting of a series of frames is formed upon discretisation of the audio signal within a first and a second frame in the series of frames, where the second frame follows the first frame, using data of the contour of the fundamental tone of the first and second frames to obtain a first discrete presentation. The audio signal is discretised within the second and third frames, where the third frame follows the second frame in the series of frames. During discretisation, data of the contour of the fundamental tone of the second frame and data of the contour of the fundamental tone of the third frame are used to obtain a second discrete presentation. A first and a second scaling window are formed for the first and the second discrete presentation, where scaling window parameters depend on discretisation characteristics, performed to obtain a first discrete presentation or a second discrete presentation.

EFFECT: high efficiency of encoding signals with variable base frequency while maintaining high quality of encoded and decoded audio signals.

21 cl, 18 dwg