Multiple channel earphone

Details Multiple channel earphone Multiple channel earphone

Filed on

2006-05-24

Date issued

2010-10-19

Examiner

Le, Huyen D (Department: 2614)

Patent Class

Electrical audio signal processing systems and devices

SubClass

Electro-acoustic audio transducer

SubSubClass

Plural or compound reproducers

Other Related Categories

C381S309000, C381S382000

Type

Reexamination Certificate

Status

active

Patent number

07817814

Description

ABSTRACT:
The present invention relates to a multiple channel earphone of small volume. In the earphone structure, a chamber tube with an adjusting hole or a set of adjusting holes is provided. The sound pressure of the chamber tube is naturally released without affected the performance of the main chamber sound field. When the external speaker connected to the chamber tube generates a large sound pressure, the sound pressure released naturally by the adjusting hole or a set of adjusting holes is increased accordingly, so that the sound pressure produced by the external speaker connected to the chamber tube is controlled by the main chamber.

REFERENCES:
patent: 7155025 (2006-12-01), Weffer
patent: 7289641 (2007-10-01), Yang
patent: 7463748 (2008-12-01), Yang
patent: 2003/0103637 (2003-06-01), Huang
patent: 2005/0205350 (2005-09-01), Yang
patent: 2005/0207606 (2005-09-01), Yang
patent: 2005/0207607 (2005-09-01), Yang
patent: 2005/0238189 (2005-10-01), Tsai
patent: 1226797 (1999-08-01), None
patent: 2450845 (2001-09-01), None
patent: 23 35 201 (1975-02-01), None
“1st Office Action of China counterpart application”, issued on Mar. 13, 2009, p. 1-p. 9.
“2nd Office Action of China counterpart application”, issued on Oct. 9, 2009, p. 1-p. 10.

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