Download or read book Active Noise Control Technique Application in Air Conditioning Ducts written by Aloysius Decruz and published by . This book was released on 2009 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Active Noise Control (ANC) is a technique for reducing noise by destructive interference of noise sound wave by out-of-phase secondary sound wave. In air conditioning installations, high frequency noises are effectively attenuated by porous-structured medium; but the low frequency noise produced by the fan needs a more sophisticated approach. An algorithm, 'Hardware-Tuned Feedback ANC (HTFA)', has been developed to implement the ANC technique for the noise reduction application in an air conditioning duct element, where Digital Signal Processing is used to sample noise and produce a complete anti-phase noise produced by the HTFA algorithm. Typical blade pass frequency in the vicinity of 100 Hz require sampling frequency of minimum twice that value. A 600 MHz fixed point Digital Signal Processor (DSP) from Texas Instrument, TMS320C6416DSK, is used to generate a secondary sound field by using an adaptive algorithm of Least Mean Square (LMS) principle for convergence. A duct section is used for the experiment and the effectiveness of low frequency attenuation by the secondary sound field is measured. Low and medium frequency tonal noises of octave bands 63 Hz - 1000 Hz were tested, low frequency below 250 Hz being the range of interest. Optimum frequency values for which ANC is more effective are determined. It was found that Active Noise Cancellation is effective at 63 Hz and 125 Hz. This is a simple, economic and effective method for noise cancellation compared to existing feed-forward software tuned method.

Download or read book Active Noise Control written by Kenneth Maurice Jackson and published by . This book was released on 2008 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Application of Adaptive Techniques to Duct Active Noise Control written by Mark Johnson and published by . This book was released on 1992 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Understanding Active Noise Cancellation written by Colin H. Hansen and published by CRC Press. This book was released on 1999-06-04 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding Active Noise Cancellation Provides a concise introduction to the fundamentals and applications of active control of vibration and sound for the non-expert. It is also a useful quick reference for the specialist engineer. The book emphasises the practical applications of technology, and complex control algorithms and structures are onl

Download or read book The Active Noise Control of a One dimensional Duct written by Young-Su Lee and published by . This book was released on 1997 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Noise Control in Mechanical Services written by R. I. Woods and published by Taylor & Francis. This book was released on 1972 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development and Demonstration of Active Noise Control Concepts written by and published by . This book was released on 2000 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book On line Modeling Techniques for Active Noise Control in the Duct written by Yann-Guang Chyan and published by . This book was released on 1992 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Active Noise Control in Ducts written by Rodney D. Hanze and published by . This book was released on 1991 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Global Active Noise Control of a One dimensional Acoustic Duct Using a Feedback Controller written by Andrew James Hull and published by . This book was released on 1990 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Study of Acoustic Feedback in Active Noise Control in Ducts written by Paul R. Enderle and published by . This book was released on 1990 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fixed filter Designs for Active Noise Control in Ducts written by Prashant Girdharilal Mehta and published by . This book was released on 1996 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Evaluation of Current Adaptive Active Duct Noise Control Algorithms written by Michael David Lucey and published by . This book was released on 1996 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Active Noise Control of Multiple Acoustic Modes in a Circular Duct written by B. J. Ikelheimer and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Active Noise Control in Ducts Using Adaptive Digital Filters written by Laurent Ludovic Jerome Billet and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Study of Active Noise Control System for a Commercial HVAC Unit written by Naga Devineni and published by . This book was released on 2011 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Active Noise Control ANC System for a Commercially Available HVAC Using Feedback Architecture written by Prashanth Kasbekar and published by . This book was released on 2012 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis report discusses design of an Active Noise Control (ANC) system for a commercially available HVAC using Feedback architecture. Reducing noise in living environments is an important problem to create quieter residential and work places. The main contributions of this thesis include development of a real time, stable and fast single channel Feedback ANC prototype ANC using a FPGA to cancel the compressor noise. Based on observations from the real time implementation a multichannel Feedback ANC with novel delayless subband architecture has been developed to reduce computational complexity and to improve performance. This work represents an important step in developing an ANC system for the HVAC due to application of novel delayless subband multichannel Feedback ANC algorithm on real data collected from the HVAC system. It also discusses the practical issues involved in developing an ANC system prototype using a FPGA.