| Summary: | 碩士 === 國立臺北科技大學 === 車輛工程系所 === 102 === Due to the fast development of portable entertainment system, people can enjoy music at any time. But on bus, train or place with low frequency noise, the performance of the headphone will be affected by low frequency noise from the environment. Although this problem can be overcome by playing music at high volume, but it could cause hearing damage.
This thesis is focusing on active noise control of headphone by using integrated feedback active noise control (IFBANC). The implementation of active noise control uses the digital signal processor TMS320C6713DSK from Texas Instruments to reduce noise while playing music from the headphone in the listening room. Experiments are conducted to investigate firstly the influences of filter length of secondary-path to noise reduction with filter length of 50, 100 and 150 under noise source condition of single-tone noise, dual-tone noise, triple-tone noise and frequency band noise. After the filter length of 150 is chosen, the performance of noise reduction when the headphone playing music is studied for noise source of single-tone and dual-tone noise at 60dB, 70dB and 80dB noise sound level.
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