Speaker unit for low frequency reproduction

Details Speaker unit for low frequency reproduction Speaker unit for low frequency reproduction

2005-06-28

2005-06-28

Ni, Suhan (Department: 2643)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Having acoustic wave modifying structure

C381S346000, C381S348000, C181S185000

Reexamination Certificate

active

06912290

ABSTRACT:
The invention provides a speaker unit for low frequency reproduction wherein distortion is reduced and the orientation of a sound image of the lower side frequency region is augmented. To that end, the phase characteristic in an actually used frequency band is made substantially flat. The speaker unit includes a speaker enclosure, a duct formed in the speaker enclosure and having a port thereon, and a speaker mounted in the speaker enclosure. The speaker is formed such that it has a first resonance frequency set higher than a higher side frequency of the actually used frequency band (about 20 Hz to 100 Hz), while the port is formed such that it has a second resonance frequency set lower than a lower side frequency of the used frequency band. For example, the speaker includes a vibrating system having a reduced mass or a reduced compliance with which the first resonance frequency is set higher than the higher side frequency of the actually used frequency band, and the duct has an increased length or a controlled cross sectional area with which the second resonance frequency is set lower than the lower side frequency of the actually used frequency band.

REFERENCES:
patent: 4410064 (1983-10-01), Taddeo
patent: 4590332 (1986-05-01), Delbuck
patent: 4953655 (1990-09-01), Furrukawa
patent: 5004066 (1991-04-01), Furukawa
patent: 5333204 (1994-07-01), Hamada et al.
patent: 6144751 (2000-11-01), Velandia
patent: 6389146 (2002-05-01), Croft

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