An Active Noise Control Headset for Crew Members of Ambulance

Tsuyoshi USAGAWA  Yasuyuki SHIMADA  Yoshitaka NISHIMURA  Masanao EBATA  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E84-A   No.2   pp.475-478
Publication Date: 2001/02/01
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section LETTER (Special Section on Noise Cancellation and Reduction Techniques)
Category: Active Noise Control
ANC,  ambulance siren,  delayed-X harmonics synthesizer algorithm,  headset,  

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Generally, a siren of ambulance is used to let drivers know that an ambulance is approaching. Although the siren system is effective to alert the drivers and pedestrians, the sound of siren is noisy in a cabin of ambulance. In this paper, an active noise control (ANC) system to control the sound of siren using headset is proposed. The proposed ANC system selectively controls only the sound of siren, and other sound such as speech is not affected at all. The achieved attenuation level by the proposed ANC system is more than 20 dB.