SELECTIVE BASS POST-FILTER Russian patent published in 2018 - IPC G01L19/00 

FIELD: physics.

SUBSTANCE: post-filter (440; 550; 740; 1040; 1140) of interharmonic noise attenuation adapted to receive an input signal which includes a preliminary audio signal decoded in accordance with one of several decoding modes, where post-filter activity is traditionally associated with particular coding modes, and to supply output audio signal. It comprises a control section intended for selective activation of the post-filter in one of the following modes: i) a filtering mode, where it filters the preliminary audio signal to produce a filtered signal and supply it as an output audio signal; and ii) a transmission mode, where it provides a preliminary audio signal as an output audio signal. Moreover, the mentioned control section is configured to transit to the transmission mode in response to a value of the post-filter signal, whereby a traditional decoding mode with filtration is applied without filtration, and the post-filter signal is included in the input signal.

EFFECT: possibility of deactivating the post-filter depending only on post-filtering information and, accordingly, regardless of factors such as current coding mode.

10 cl, 11 dwg