TIME-DEFORMATION ACTIVATION SIGNAL TRANSMITTER, AUDIO SIGNAL ENCODER, METHOD OF CONVERTING TIME-DEFORMATION ACTIVATION SIGNAL, AUDIO SIGNAL ENCODING METHOD AND COMPUTER PROGRAMMES Russian patent published in 2014 - IPC G10L19/10 H03M7/30 

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to encoding and decoding an audio signal having the harmonic or speech content, which can be subjected to time-deformation processing. An encoder includes a window function controller, a window set-up device, a time deformation device with final quality check functionality, a time/frequency converter, a TNS stage or encoding device quantiser. The window function controller, time deformation device, TNS stage or an additional ambient noise analyser are controlled by the signal analysis results obtained by the time deformation analyser or signal classifier. The decoder applies an ambient noise operation using an estimate of the controlled ambient noise depending on the harmonic or speech characteristic of the audio signal.

EFFECT: high encoding efficiency.

16 cl, 37 dwg