Nonlinear analysis of loudspeaker

Xiao, Sundi

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https://hdl.handle.net/2142/104046 Copy

Description

Title

Nonlinear analysis of loudspeaker

Author(s)

Xiao, Sundi

Contributor(s)

Allen, Jont

Issue Date

2019-05

Keyword(s)

• Impedance
• Linearity
• 2-port Network
• Transducers
• Admittance
• Harmonic Distortion
• Maxwell Equation
• Thevenin Equation

Abstract

This project developed a measurement system to investigate the behavior of a loudspeaker on a frequency band. This system works with Network-analyzer (MU-Box manufactured by Mimosa Acoustics), a breakout box that handles CH-OUT and CH-IN, and a circuit board driving the impedance load via an amplifier and 7 Volts voltage source. The purpose is to determine characterization and to model nonlinearity of audio speaker by using the speaker harmonic distortion, representation of nonlinearity, to evaluate hypotheses that the pressure of the speaker should be proportional to the current passing through the speaker. Theories used in the measurement include Op-Amp amplifier, Thevenin Equivalent, harmonic observation, Maxwell Equation and 2-port Network. During several experiments, the existing problems include limitation of amplifier and power supply, communication between hardware and software. Chirp and pure tones are used as stimulus to measure impedance and harmonic distortion respectively. The final result verifies the stated hypotheses by the pattern of second harmonic for both pressure and current, which provides significant foundation of future work.

Type of Resource

text

Language

en

Permalink

http://hdl.handle.net/2142/104046

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