US3941931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio signal mixing system
Assignee: Sony Corp
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Filing: 1974-02-11
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Granted: 1976-03-02
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Expires: 1994-02-11
Abstract
Abstract An audio signal mixing system having left and right channels to transmit stereophonic left and right signals and each containing monaural signals and having left and right loudspeakers to reproduce the stereophonic signals, which includes a circuit for eliminating the monaural signal in one of the left and right channels, and also includes a mixing circuit for mixing a signal derived from a microphone in the other channel with the stereophonic signals, so that two different kinds of monaural signals as well as the stereophonic signals are reproduced by each loudspeaker.
Inventors
- 👤 Yoshio Osakabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:03
CPC Classifications
H; H04; H04S; H04S1/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
121 words
An audio signal mixing system comprising: a. left and right channels for transmitting stereophonic left and right signals L and R each, respectively, containing a monaural signal; b. a first circuit for eliminating said monaural signal contained in either one of said left and right signals L and R; and c. a second circuit supplied with an additional signal and mixing it with either one of said left and right signals L and R, whereby said either one of said left and right signals L and R and said additional signal are passed by one of said left and right channels, and the other one of the L and R signals and the monaural signal are passed by the other channel.
Claim 2
Dependent Claim
121 words
An audio signal mixing system comprising: a. left and right channels for transmitting stereophonic left and right signals L and R each, respectively, containing a monaural signal; b. a first circuit for eliminating said monaural signal contained in either one of said left and right signals L and R; and c. a second circuit supplied with an additional signal and mixing it with either one of said left and right signals L and R, whereby said either one of said left and right signals L and R and said additional signal are passed by one of said left and right channels, and the other one of the L and R signals and the monaural signal are passed by the other channel.
Claim 3
Dependent Claim
90 words
An audio signal mixing system as claimed in claim 1, wherein said first circuit comprises a first variable resistor with a slide contact arm connected between the left and right channels and said second circuit comprises a second variable resistor with a slide contact arm connected between the left and right channels, a signal of opposite polarity to said stereophonic signals L and R applied to said slide contact arm of said first variable resistor and said additional signal applied to said slide contact arm of said second variable resistor.
Claim 4
Dependent Claim
26 words
An audio signal mixing system as claimed in claim 2, wherein said slide contact arms of said first and second variable resistors are mechanically ganged together.
Claim 5
Dependent Claim
38 words
An audio signal mixing system as claimed in claim 2, wherein said slide contact arm of said second variable resistor is connected at one end of said second variable resistor to a microphone which furnishes said additional signal.
Claim 6
Dependent Claim
29 words
An audio signal mixing system as claimed in claim 4, wherein a delay circuit is connected between said microphone and the slide contact arm of said second variable resistor.
Claim 7
Dependent Claim
61 words
An audio signal mixing system as claimed in claim 2, wherein said left channel includes a first transistor having base, emitter and collector electrodes and said right channel includes a second transistor having base, emitter and collector electrodes, and the collector electrodes of said first and second transistor connected together and to said slide contact arm of said first variable resistor.
Claim 8
Dependent Claim
106 words
An audio signal mixing system as claimed in claim 1, wherein said first circuit includes a first variable resistor which has a slide contact arm and is connected between said left and right channels, first and second filters respectively connected to said left and right channels and passing signals corresponding to a frequency band of a human voice, and a means for applying the output signals from said first and second filters to said slide contact arm of said first variable resistor, and said second circuit includes a second variable resistor which is connected between said left and right channels and has a slide contact arm.
Claim 9
Dependent Claim
95 words
An audio signal mixing system as claimed in claim 7, further comprising a circuit for producing a signal which is the sum of said stereophonic left and right signals, L and R, a third filter connected to said sum signal producing circuit and passing a signal with a frequency band of a human voice, and a means for supplying the output signal from said third filter to said slide contact arm of said second variable resistor, whereby the signal with said frequency band of a human voice in said stereophonic signals becomes the additional signal.
Claim 10
Dependent Claim
41 words
An audio signal mixing system as claimed in claim 8, wherein a signal emphasis circuit is provided between said sum signal producing circuit and said slide contact arm of said second variable resistor, said signal emphasis circuit includes delay signal means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |