US5402500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adaptive proportional gain audio mixing system
Assignee: Lectronics Inc
•
Filing: 1993-07-14
•
Granted: 1995-03-28
•
Expires: 2013-07-14
Abstract
Abstract An improved audio mixing system. The system is not limited to one type of microphone and does not depend on separate sensing microphones to determine the background noise level. In addition, the active signal is not amplitude modulated by extraneous noise inputted through inactive microphones. The mixing system divides the system gain between a plurality of input channels. The mixing system periodically samples the channels and determines which channel is the dominant channel. In response to this determination, the gain of the dominant channel is increased and that of the other channels decreased.
Inventors
- 👤 Travis M. Sims, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:44
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3005; H03G3/301; H04; H04H; H04H60/00; H04H60/02; H04H60/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
218 words
An audio mixing system comprising: a plurality of input channels, each said input channel comprising means for receiving an input signal; and means for generating an attenuated signal from said input signal, the degree of attenuation being specified by a channel control signal corresponding to said channel; means for combining all of said attenuated signals to form an output signal; and control means for generating said channel control signals, each said channel control signal being responsive to said input signal on said channel, said attenuated signal on said channel, and the value of a parameter x corresponding to said channel, said parameter x corresponding to each said channel defining the relative contribution of said input signal and said attenuated signal in said channel to said channel control signals, wherein said control means further comprises means for periodically selecting one of said channels, said selection depending on said parameter x, said attenuated signal, and said input signal for each said channel, over a preceeding time period and wherein said control means decreases said parameter x corresponding to said selected channel and increases said parameter x corresponding to the remaining channels provided said increases or decreases do not cause x to have a value outside a predetermined range, said increases and decreases being made in response to said periodic determination.
Claim 2
Dependent Claim
218 words
An audio mixing system comprising: a plurality of input channels, each said input channel comprising means for receiving an input signal; and means for generating an attenuated signal from said input signal, the degree of attenuation being specified by a channel control signal corresponding to said channel; means for combining all of said attenuated signals to form an output signal; and control means for generating said channel control signals, each said channel control signal being responsive to said input signal on said channel, said attenuated signal on said channel, and the value of a parameter x corresponding to said channel, said parameter x corresponding to each said channel defining the relative contribution of said input signal and said attenuated signal in said channel to said channel control signals, wherein said control means further comprises means for periodically selecting one of said channels, said selection depending on said parameter x, said attenuated signal, and said input signal for each said channel, over a preceeding time period and wherein said control means decreases said parameter x corresponding to said selected channel and increases said parameter x corresponding to the remaining channels provided said increases or decreases do not cause x to have a value outside a predetermined range, said increases and decreases being made in response to said periodic determination.
Claim 3
Dependent Claim
54 words
The mixing system of claim 1 wherein said means for periodically selecting one of said channels comprises means for generating a signal for each channel, said signal depending on said input signal, said attenuated signal and parameter x for said channel; and means for determining which of said generated signals has the maximum amplitude.
Claim 4
Dependent Claim
41 words
The mixing system of claim 1 wherein said signal has a an amplitude given by P*(1-x)+A*x for each said input channel, where P is said input signal to said input channel, A is said attenuated signal generated by said input channel.
References Cited (Backward Citations)
US4466119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-27 | 1998-09-26 | 1999-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-27 | 2002-09-26 | 2003-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-27 | 2006-09-26 | 2007-03-28 | $7700.00 | Window Closed / Lapsed |