FIELD: acoustics.
SUBSTANCE: invention relates to acoustics, in particular to filters for filtering music signals. Active or passive four-port for filtering music signals contains two coupled oscillatory circuits, one of which is serial, and another parallel, made of capacitors and inductances, or in the form of gyrators, or in the form of digital software or hardware filters. Filter is designed in such a way that the intrinsic resonance frequency of both oscillation circuits is much lower than the lower limit of the frequency range of the useful signal.
EFFECT: improved quality of recording and playback of musical phonograms.
1 cl, 5 dwg
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