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Title:All-Digital Audio Amplifier
Author(s):Pascual, Cesar
Doctoral Committee Chair(s):Krein, Philip T.
Department / Program:Electrical Engineering
Discipline:Electrical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Engineering, Electronics and Electrical
Abstract:The approach presented in these pages processes the audio information digitally and generates a two-level pulse-width modulation (PWM) signal that is amplified by a switching power stage and finally low-pass filtered before it is sent to a speaker. The purpose of the digital signal processing (DSP) portion of the system is to transform the original audio information into a feasible, low-level PWM signal, with minimum possible degradation. The digital audio information is first upsampled, then converted from uniform to natural sampling to minimize distortion, and finally noise shaped to reduce the time resolution needed by the PWM edges without compromising the signal-to-noise (SNR) ratio. A PWM generator converts samples into pulses, and a switching stage creates a high-power replica of the PWM signal. Switching minimizes energy losses and introduces minimum extra degradation. The output low-pass filter extracts the audio information from the PWM signal and delivers it to the speaker. Each of the functional blocks required by this approach has been justified, implemented, and evaluated.
Issue Date:2001
Description:116 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2001.
Other Identifier(s):(MiAaPQ)AAI9996671
Date Available in IDEALS:2015-09-25
Date Deposited:2001

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