AUDIO ENCODER AND AUDIO DECODER FOR ENCODING FRAMES PRESENTED IN FORM OF AUDIO SIGNAL SAMPLES Russian patent published in 2013 - IPC G10L19/04 

FIELD: information technology.

SUBSTANCE: audio encoder (100) for encoding frames presented in form of audio signal samples to obtain encoded frames, wherein a frame consists of a plurality of time domain audio signals, including a predictive coding analysis stage (110) and determining information on coefficients of a synthesis filter and prediction domain frame information based on a frame of audio samples. The audio encoder (100) further includes a domain converter (120) for converting a frequency domain audio sample frame and obtaining a frame spectrum and an encoding domain computer (130) for making a decision on encoded data for a frame based on information on coefficients and information on a prediction domain frame, or based on the frame spectrum. The audio encoder (100) includes a controller (140) for determining information on a switching coefficient for cases when the encoding domain computer decides that encoded data of the current frame are based on information on coefficients and information on a prediction domain frame, and [for cases] when data of a previous frame were encoded based on the spectrum of the previous frame and redundancy reducing encoder (150) for encoding information on the prediction domain frame, information on coefficients, information on the switching coefficient and/or frame spectrum.

EFFECT: improved concept of audio encoding using encoding domain switching.

14 cl, 29 dwg