Transmitter structure for limiting the effects of wind noise on a microphone

• US 6,091,830 A
• Filed: 06/03/1997
• Issued: 07/18/2000
• Est. Priority Date: 07/19/1996
• Status: Expired due to Term

• Current Assignee: Lenovo Innovations Ltd Hong Kong (Lenovo Group Ltd.)
• Original Assignee: NEC Corporation
• Inventors: Toki, Nozomi
• Primary Examiner(s): Kuntz, Curtis A.
• Assistant Examiner(s): PENDLETON, DIONNE
• Application Number:
  US08/867,997
• Time in Patent Office: 1,141 Days
• Field of Search: 381/359, 381/360, 381/355, 381/356, 381/357, 381/188
• US Class Current: 381/359
• CPC Class Codes: H04M 1/19 Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor circuit arrangements for preventing eavesdropping H04M1/68; telephone cabinets E04H1/14
• CPC Class Codes: H04R 1/086 Protective screens, e.g. all weather or wind screens

Abstract

A transmitter structure which is resistance to wind noise and the like and allows a reduction in size is disclosed. A sound hole is formed in a case at an offset position with respect to a microphone, and a slit extending from the sound hole to the microphone is filled with an acoustic resistance cloth.

Claims

1. A transmitter structure comprising:

a microphone;

a case having at least one first sound hole formed therein on a front side of said microphone and offset from said microphone such that none of the sound holes or portions thereof are in direct communication with the microphone;

a microphone holder disposed within the case and having a support for supporting the microphone therein, the microphone holder further having a first interior channel acoustically connecting said front side of said microphone to said at least one first sound hole; and

a first acoustic resistance cloth which fills the first interior channel.

2. A structure according to claim 1, wherein the first interior channel has a width of 2.5 mm, a height of 0.3 mm, and a length of 10 mm.

3. A structure according to claim 1, further comprising at least one second sound hole formed in said case on a rear side of said microphone wherein said holder further having a second interior channel acoustically connecting said at least one second sound hole to the rear side of said microphone, and a second acoustic resistance cloth which fills said second interior channel.

4. A structure according to claim 3, wherein said microphone is a pressure gradient microphone including a directional microphone and a close-talking microphone.