{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/81371"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/81371","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"All-Digital Audio Amplifier","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.","abstract_html":"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.","abstract_has_math":false,"creators":["Pascual, Cesar"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Electrical Engineering","degree_department":null,"school":null,"contributors":["Krein, Philip T."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-25T20:10:46Z","date_published":"2015-09-25T20:10:46Z","updated_at":"2026-07-22T22:26:16Z","subjects":["Engineering, Electronics and Electrical"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI9996671"],"render_values":[{"text":"(MiAaPQ)AAI9996671","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/81371","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Krein, Philip T."]},{"key":"dc:creator","label":"Author","values":["Pascual, Cesar"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-25T20:10:46Z","10000-01-01","2001"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Electrical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Engineering, Electronics and Electrical"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/81371","(MiAaPQ)AAI9996671"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["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.","Made available in DSpace on 2015-09-25T20:10:46Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 9996671.pdf: 4978303 bytes, checksum: 7302a3e1631b7c3c08c22269cedb3807 (MD5) Previous issue date: 2001","Embargo set by: Seth Robbins for item 82652 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","116 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2001."]},{"key":"dc:title","label":"Title","values":["All-Digital Audio Amplifier"]}]}],"canonical_facts":{"dc:contributor":["Krein, Philip T."],"dc:creator":["Pascual, Cesar"],"dc:date":["2015-09-25T20:10:46Z","10000-01-01","2001"],"dc:description":["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.","Made available in DSpace on 2015-09-25T20:10:46Z (GMT). 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