Title :
Investigation of directional audio system based on ultrasonic modulation
Author :
Li, Deke ; Huang, Dagui
Author_Institution :
Sch. of Mechatron. Eng., Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
In this paper the structure and basic principle of directional audio system and its realization process are analyzed. An audio signal processing module with digital signal processor as its core is designed. According to the theory of nonlinear self-demodulation, three kinds of signal processing methods including DSB, distortion compensation DSB and SSB are introduced. Finally the directivity of ultrasonic transducer array is analyzed and simulated, the result presents that directivity of the sound can be effectively improved by using array technique.
Keywords :
acoustic signal processing; audio systems; ultrasonic transducer arrays; SSB; audio signal processing module; digital signal processor; directional audio system; distortion compensation DSB; nonlinear self demodulation; ultrasonic modulation; ultrasonic transducer array; Acoustics; Amplitude modulation; Arrays; Frequency modulation; Ultrasonic imaging; Ultrasonic transducers; DSP; directional audio; modulate; ultrasonic transducer;
Conference_Titel :
Mechatronics and Automation (ICMA), 2010 International Conference on
Conference_Location :
Xi´an
Print_ISBN :
978-1-4244-5140-1
Electronic_ISBN :
2152-7431
DOI :
10.1109/ICMA.2010.5589011
