Adaptive noise cancellation in a duct using digital signal processing

Date of Publication

1997

Document Type

Bachelor's Thesis

Degree Name

Bachelor of Science in Electronics and Communications Engineering

Subject Categories

Engineering

College

Gokongwei College of Engineering

Department/Unit

Electronics and Communications Engineering

Abstract/Summary

Adaptive Noise Cancellation in a Duct Using Digital Signal Processing utilizes active noise reduction techniques, using loudspeakers to lessen noise coming from a sound source through the use of Digital Signal Processing. However, the system reduces noise levels up to a certain extent only. The thesis is an applied research on active reduction systems. It includes a prototype of a 5-ft PVC tube, simulating the effect of noise canceling in a duct to test its efficacy. The prototype nonetheless is limited to sounds generally encountered in ducts and air ventilation systems like sounds produced by the flow of air, machineries, fans, compressors, etc. which generally have low frequencies. It focuses on noise patterns of about 70 to about 700Hz. The project's success is based on subjective listening and on measuring the difference in noise levels (using a decibel noise level meter, volt meter, and a computer display of the sound waves that our system would pick up). The average decibel readings on the instruments are used to generate the results. Computer software simulation was also used to show and prove Active/Adaptive Noise Cancellation.

Abstract Format

html

Language

English

Format

Print

Accession Number

TU07853

Shelf Location

Archives, The Learning Commons, 12F, Henry Sy Sr. Hall

Physical Description

115 numb. leaves ; Computer print-out.

Keywords

Signal processing--Digital techniques; Noise control; Digital electronics; Adaptive signal processing; Soundproofing

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