Patent US3924072A successfully refreshed from Google Patents.
US3924072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Headphone with cross feeding ambience control
Assignee: Koss Corp
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Filing: 1974-07-10
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Granted: 1975-12-02
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Expires: 1994-07-10
Abstract
Abstract A stereophonic headphone includes ambience control potentiometers connected in series with each audio transducer. A portion of the audio signal applied directly to each audio transducer is coupled to the ambience control potentiometer of the other audio transducer and is applied to the other audio transducer 180* out of phase. A mixing of the left and right audio channels is thus obtained and can be controlled by the listener to provide the desired binaural listening effect.
Inventors
- 👤 Jacob C Turner
- 👤 Douglas M Elliott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:06
CPC Classifications
H; H04; H04R; H04R5/00; H04R5/04; H04R5/033
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
334 words
In a stereophonic headphone having a first audio transducer mounted in a first cup for positioning over one ear of a listener and having a pair of input terminals, a second audio transducer mounted in a second cup for positioning over the other ear of the listener and having a pair of input terminals, and cable means for coupling separate audio signals to each of said audio transducers, the improvement therein comprising: a left channel lead in said cable means connected to one input terminal on said first audio transducer; a right channel lead in said cable means connected to one input terminal on said second audio transducer; first ambience resistor means mounted in one of said cups and connected between the other terminal on said first audio transducer and a ground lead in said cable means, said first ambience resistor means being operable to voltage divide an audio signal applied across said left channel lead and said ground lead with said first Audio transducer; a first coupling resistor mounted within one of said cups and connected to the right channel lead and coupled to said first ambience resistor means, said first coupling resistor being operable to couple a portion of said left channel signal generated across said first ambience resistor means to said one input terminal on said second audio transducer; a second ambience resistor means mounted within one of said cups and connected between the other terminal on said second audio transducer and said ground lead, said second ambience resistor means being operable to voltage divide an audio signal applied across said right channel lead and said ground lead with said second audio transducer; and a second coupling resistor mounted within one of said cups and connected to the left channel lead and coupled to said second ambience resistor means, said second coupling resistor being operable to couple a portion of said right channel signal generated across said second ambience resistor means to said one input terminal on said first audio transducer.
Claim 2
Dependent Claim
334 words
In a stereophonic headphone having a first audio transducer mounted in a first cup for positioning over one ear of a listener and having a pair of input terminals, a second audio transducer mounted in a second cup for positioning over the other ear of the listener and having a pair of input terminals, and cable means for coupling separate audio signals to each of said audio transducers, the improvement therein comprising: a left channel lead in said cable means connected to one input terminal on said first audio transducer; a right channel lead in said cable means connected to one input terminal on said second audio transducer; first ambience resistor means mounted in one of said cups and connected between the other terminal on said first audio transducer and a ground lead in said cable means, said first ambience resistor means being operable to voltage divide an audio signal applied across said left channel lead and said ground lead with said first Audio transducer; a first coupling resistor mounted within one of said cups and connected to the right channel lead and coupled to said first ambience resistor means, said first coupling resistor being operable to couple a portion of said left channel signal generated across said first ambience resistor means to said one input terminal on said second audio transducer; a second ambience resistor means mounted within one of said cups and connected between the other terminal on said second audio transducer and said ground lead, said second ambience resistor means being operable to voltage divide an audio signal applied across said right channel lead and said ground lead with said second audio transducer; and a second coupling resistor mounted within one of said cups and connected to the left channel lead and coupled to said second ambience resistor means, said second coupling resistor being operable to couple a portion of said right channel signal generated across said second ambience resistor means to said one input terminal on said first audio transducer.
Claim 3
Dependent Claim
49 words
The stereophonic headphone as recited in claim 1 which includes a double pole single throw ambience switch mounted within one of said cups and having one pole connected in series circuit with said first coupling resistor and its other pole connected in series circuit with said second coupling resistor.
Claim 4
Dependent Claim
27 words
The stereophonic headphone as recited in claim 1 in which said first and second ambience resistor means are potentiometers, each having a resistance element and a slider.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |