 Clutch releasing and braking mechanism for fishing reel |
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| Drag control mechanism for use in fishing reels |
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| Clutch mechanism for reel having spool shaft supported at both ends |
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| Clutch mechanism for bait casting fishing reel |
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| Fishing reel with position regulator for drag control member |
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| Hang glider launch vehicle |
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| Tape cassette with clutch assembly |
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| Internal combustion engine |
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Transducer coupling system
| Details |
Inventors: Carlson, Elmer V.;
Assignee: Industrial Research Products, Inc. (Elk Grove Village, IL)
Primary Examiner: Stellar; George G.
Assistant Examiner:
Attorney, Agent or Firm: Aubel; Leo J.
A transmission system is disclosed having an improved means for coupling sound to and from a transducer. The system includes a main sound channel and an associated cavity; damping elements are selectively positioned in or adjacent the cavity to provide a suitable acoustic impedance in the desired operating frequency range to effect a smooth acoustical operation. |
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DETAILED DESCRIPTION What is claimed is: 1.
An acoustic transmission system for acoustically coupling to an associated transducer and providing a relatively smooth output response therefrom, said system comprising in combination, first duct means having one end acoustically coupling to the transducer and its other end open, said first duct means effecting a first acoustical impedance, second duct means having one end acoustically connected to said first duct means, the other end of said second duct means which is remote from the first duct means being acoustically blocked, acoustic damping means in said second duct means, and said acoustic damping means having the characteristic impedance of said second duct means.
2.
An acoustic transmission system as in claim 1 wherein the second duct means is of the same length as said first duct means and wherein an acoustically closed end terminates the remote end of said second duct means.
3.
An acoustic transmission system as in claim 1 wherein said first duct and said second duct are of substantially the same length and cross section.
4.
A system as in claim 1 further including a common duct means for acoustically coupling the transducer to said first and second duct means, the open end of said first duct means enabling the system to be acoustically coupled to an ear cavity and the blocked end of said second duct means providing a high impedance termination, and a second damping means having a similar impedance to said first damping means mounted in said first duct means, whereby the impedance presented by said system to sound from said transducer is relatively constant throughout the operating frequency range.
5.
A system as in claim 4 wherein said common duct means couples at a junction with said first and second duct means, and wherein said first damping means is positioned in said second duct means adjacent the junction of said second duct means and said common duct means, and said second damping means is positioned in said first duct means adjacent the junction of said first duct means and said common duct means whereby a relatively smooth output response is obtained from said transmission system
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Telecommunications 
