Idle Noise Reduction of a Parametric Acoustic Array Power Driver

Autor:	Matija Pirc
Rok vydání:	2019
Předmět:	Noise Carrier-to-noise ratio Computer science Noise reduction Acoustics Ultrasonic sensor Electrical and Electronic Engineering Audio power amplifier Signal Directivity Electronic Optical and Magnetic Materials Parametric statistics
Zdroj:	Informacije MIDEM - Journal of Microelectronics, Electronic Components and Materials. :33-42
ISSN:	2232-6979 0352-9045
DOI:	10.33180/infmidem2019.105
Popis:	Parametric acoustic arrays (PAA) have progressed from specialized niche applications to commercially available audio solutions in the last two decades. Their primary advantage is their incredible directivity and their main disadvantage is low conversion efficiency of the primary ultrasonic waves into audible sound. This paper presents a noise analysis of a practical implementation of a directional audio system. The system is comprised of a modulator, a D-class audio amplifier, and an emitter consisting of 97 commercially available piezoelectric ultrasonic transducers. The designed system exhibited an uncomfortable level of idle noise at the maximum volume level. The analysis of the signal path and all the noise sources revealed that the most critical component was the modulator, and a solution was devised which provided a 16 dB improvement of the carrier to noise ratio.
Databáze:	OpenAIRE
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