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US 5,333,204 AGranted
Speaker system
AssigneePioneer Electronic Corporation
InventorsHiroyuki Hamada, Takahiro Naka
Life of this patent
Estimating the term…
Abstract
A speaker system has a bass-reflex duct provided in a cabinet. A sub-duct is provided on a central portion of the bass-reflex duct. The sub-duct is communicated with the bass-reflex duct, and filled with sound absorbing material for absorbing unnecessary resonance generated in the bass-reflex duct.
Claims1
A speaker system having a bass-reflex duct provided in a cabinet, comprising:
- a sub-duct provided on a central portion of the bass-reflex duct, and communicated with the bass-reflex duct;
- sound absorbing material provided in said sub-duct for absorbing unnecessary resonance generated in the bass-reflex duct;
- wherein a length of said sub-duct is determined by
- L=(c/4fr)-0.4d
- wherein L is the length of the sub-duct, c is sound velocity, fr is an unnecessary resonance frequency of the bass-reflex duct, and d is an inner diameter of said sub-duct.
2 more elements
Dependencies are inferred from the claim text.