Data processing: structural design – modeling – simulation – and em – Simulating nonelectrical device or system
Reexamination Certificate
2004-05-05
2008-12-30
Phan, Thai (Department: 2128)
Data processing: structural design, modeling, simulation, and em
Simulating nonelectrical device or system
C703S018000, C700S094000, C381S097000, C381S120000
Reexamination Certificate
active
07472048
ABSTRACT:
A direct digital drive audio system and method system and method are presented. The direct digital drive system and method utilizes a digital signal to directly drive the speakers. In one exemplary implementation, an audio system includes a sample register, an convergence adjustment component, an accumulated error register, a digital driver and a speaker. The sample register is coupled to the convergence adjustment component which is coupled to the accumulated error register and the digital driver which in turn is coupled to the speaker. The sample register holds an audio sample. The convergence adjustment component calculates the error for each sample. The accumulated error register stores an accumulated error. The digital driver determines whether to drive on a positive digital value, drive on a negative digital value or not drive. The speaker creates audio sounds based upon a signal from the digital driver.
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Phan Thai
Trimble Navigation Limited
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