Active control apparatus with an adaptive digital filter

An active control apparatus using an adaptive IIR digital filter (16) includes a coefficient control portion (21) for updating the filter coefficient of adaptive IIR digital filter (16) so as to minimize an output error signal level, and a coefficient control portion (19) for updating the filter coe...

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Bibliographic Details
Main Authors SAITOH, JUN, IIDA, HIROYUKI, EGUCHI, MASAKI, HIYOSHI, KOZO
Format Patent
LanguageEnglish
French
German
Published 14.06.2000
Edition7
Subjects
ACOUSTICS
ACOUSTICS NOT OTHERWISE PROVIDED FOR
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS
METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL
MUSICAL INSTRUMENTS
PHYSICS
RESONATORS
SOUND-PRODUCING DEVICES
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Summary:An active control apparatus using an adaptive IIR digital filter (16) includes a coefficient control portion (21) for updating the filter coefficient of adaptive IIR digital filter (16) so as to minimize an output error signal level, and a coefficient control portion (19) for updating the filter coefficient of a recursive portion (17) so as to minimize the output level of recursive portion (17). The filter coefficient of recursive filter (17) is updated by these two coefficient control portions (19) and (21) in parallel or in a time-dividing manner.
Bibliography:Application Number: EP19930110805