ENCODING AUDIO SIGNALS Russian patent published in 2010 - IPC G10L19/00 

FIELD: physics; acoustics.

SUBSTANCE: invention relates to an encoder having an input for input of audio signal frames in a frequency range, an analysis filter for dividing the frequency range into at least a low-frequency band and high-frequency band, a first encoding unit for encoding low-frequency band audio signals, a second encoding unit for encoding high-frequency band audio signals and a mode switch for selecting operation mode of the encoder at least from a first and a second mode. In the first mode only low-frequency band signals are encoded, and in the second mode signals in the low- and high-frequency bands are encoded. The encoder also has a scaling device for controlling the second encoding unit so as to gradually change encoding characteristics of the second encoding unit relative to change of operation mode of the encoder.

EFFECT: improved method of encoding audio signals in order to limit irritating audible effects when switching between modes with different frequency bands.

23 cl, 10 dwg