US 8,439,158 B2 · Acoustic resonator and sound chamber

Abstract

An acoustic resonator adaptable to a sound chamber is designed to decrease a sound pressure while increasing a particle velocity of medium particles in a low frequency range without increasing the overall size thereof. The acoustic resonator is constituted of a pipe member having one opening end and a resistance member embracing a high resistance region and a low resistance region. The resistance member is inserted into the pipe member such that one end thereof matches the opening end of the pipe member while the other end thereof is disposed at a predetermined position inside a hollow cavity of the pipe member. The high resistance region embraces an antinode region of the particle velocity distribution with respect to a standing wave occurred in the hollow cavity at a resonance frequency, thus causing an acoustic phenomenon decreasing the resonance frequency compared to a single unit of the pipe member.

Claims28

Dependent claims

An acoustic resonator, comprising:

a pipe defining a resonant chamber having a longitudinal axis, the pipe having an open end and a closed end;
a resonating fluid located in the resonant chamber;
a resistance member extending from the open end of the resonant chamber inwardly toward, but not extending to, the closed end of the resonant chamber, the resistance member having first and second end surfaces, the first end surface being located at the open end of the resonant chamber, the second end surface being located at the antinode of a standing wave occurring in the resonant chamber, the resistance member including a high resistance region and a radially inward low resistance region located adjacent one another as viewed along a plane extending perpendicular to the longitudinal axis and extending through the resistance member, the high and low resistance regions presenting different resistances to motion of the resonating fluid, whereby the primary resonance frequency of the resonator is lower than it would be absent the presence of the resistance member.

Dependencies are inferred from the claim text.

Acoustic resonator and sound chamber

Life of this patent

Acoustic resonator and sound chamber

Life of this patent

Abstract

Claims28