Electrical audio signal processing systems and devices – One-way audio signal program distribution
Reexamination Certificate
2007-01-09
2007-01-09
Armstrong, Angela (Department: 2626)
Electrical audio signal processing systems and devices
One-way audio signal program distribution
C381S079000
Reexamination Certificate
active
10393893
ABSTRACT:
A parametric loudspeaker system using improved modulators to compensate for the non-linearity of the parametric process in air when driving the air at saturation levels and below saturation levels. The parametric loudspeaker uses a pre-processed single sideband modulator that offers ideal linearity as characterized by square root pre-processed double sideband modulators but with a lower carrier frequency and without the wide bandwidth requirements. By eliminating some or all of the lower sideband the carrier frequency can be reduced without producing sideband frequencies in the audible range. Lower operational frequencies result in greater translation efficiency and greater output capability before reaching the saturation limit of air. A pre-processor minimizes the effects of saturation limits for double sideband, truncated double sideband or single sideband processing to achieve superior output.
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Croft, III James J.
Norris Joseph O.
Spencer Michael E.
American Technology Corporation
Armstrong Angela
Thorpe North & Western LLP
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