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9. What to beware when inputting audio signal?

It’s advisable to input square signals into buzzers, for sine signals would impede their output SPL and vibration. Furthermore, pure sine signals are harder to generate, as a distorted sine signal will produce noise as well. Clients can control its SPL by tuning the duty cycle of square waves: 50% duty cycle yields maximum SPL, while 1% duty cycle yields minimum SPL. The above directions apply when buzzers operate at their rated frequency.

It’s advisable to input sine signals into micro-speakers. While buzzers are able to endure square signals thanks to their vibration mechanism, micro-speakers may suffer from burnt coils when inputted by square signals for a long time. So clients are advised to apply sine signal to a micro-speaker, to generate beeps more comfortable to human ear.

Technically when it comes to Fourier Transform, sine signals are “pure” signals consisting of only its base frequency. Square signals comprise its base frequency and its odd harmonic frequencies, which add a noise-like element to human ear.

     

 

Distribution Partner for USound

USound is a fabless audio company offering high-performance silicon speakers and high-quality sound solutions based on MEMS (Micro-Electro-Mechanical Systems) technology, safeguard by over 150 patents. With its offices in Graz, Vienna, San Francisco, Shenzhen, USound serves international customers, enabling them to create innovative smart audio applications with MEMS speakers.

Address: Kratkystraße 2 8020 Graz, Austria. 
Phone: +43-720-022463

2F No. 207, Section 6, Zhongshan North Road, Shilin District Taipei City, 111, Taiwan (R.O.C.) TEL: +886-2-8866-5255
Fax: +886-2-8866-5250
sales-tp@aatc.tw