VIRTUAL HEIGHT FILTER FOR REFLECTED SOUND PRESENTATION BY MEANS OF DIRECTED UPWARDS LOUDSPEAKERS Russian patent published in 2017 - IPC H04R1/26 

FIELD: acoustics.

SUBSTANCE: invention relates to acoustics, in particular, to acoustic systems. System comprises converters, generating first audio signal, reflected from audition environment upper surface, and second audio signal, intended for transmission directly to user. Acoustic system has two loudspeakers, one of which is directed straight forward, and second is upwards, as well as filter, made with possibility to remove directed marks from signal, passing directly from loudspeaker and insertion of directed marks from reflected signal. Filter parameters are calculated based on listener head transfer function measurements data base. Filter parameter, used for audio information removal, is obtained by initial filter parameter inversion. Filter transfer parameter is average value from several transfer parameters, corresponding to different combination of signal reflection point characteristics, listening point, loudspeaker physical location. Directed upwards loudspeaker has inclination angle adjustment device. Device also includes crossover and audio signal amplifier.

EFFECT: technical result is improvement of sound reproduction quality.

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