Title page for etd-0826109-223432


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URN etd-0826109-223432
Author Tsai-Fu Lin
Author's Email Address m953010045@student.nsysu.edu.tw
Statistics This thesis had been viewed 5537 times. Download 2384 times.
Department Electrical Engineering
Year 2008
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Frequency Shaped LQR Design of an Active Noise Cancellation Headphone
Date of Defense 2009-07-03
Page Count 64
Keyword
  • active noise control
  • frequency shaped
  • headphone
  • Abstract The purpose of this thesis is to design and implement an active noise cancellation headphone (ANC) with a feedback controller optimally designed using the linear quadratic regulator (LQR) design approach. The controller compares the audio input signal with the measured signal from a mini microphone in the headphone, and attempts to generate a control signal so that the headphone may reproduce a clean, low noise audio sound, without being interfered by the environmental noise.   
    The control bandwidth of the ANC headphone is 100~600Hz. The controller design emphasizes the choice of a weighting function in shaping the controller gain at different frequencies, so as to achieve maximum in-band noise cancellation and low noise amplification outside the bandwidth. The experimental result shows achievable noise cancellation of maximum 25dB within the control bandwidth and a barely noticeable slight noise amplification of maximum 6dB at high frequencies and 4.5dB at inaudible low frequencies.
    Advisory Committee
  • Cheng-Yi Chen - chair
  • Tsang-Yi Wang - co-chair
  • Jih-ching Chiu - co-chair
  • Shiang-Hwua Yu - advisor
  • Files
  • etd-0826109-223432.pdf
  • indicate access worldwide
    Date of Submission 2009-08-26

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