Sound Producing Device

Abstract

The present invention provides a sound producing device comprising: an air pulse generating element and a control unit. The air pulse generating element comprises an air chamber and an actuator. The control unit, configured to generate a driving voltage applied to the actuator of the air pulse generating element, such that the air pulse generating element generates a plurality of air pulses in response to the driving voltage. The plurality of air pulses are at a pulse rate, and the pulse rate of the plurality of air pulses is higher than a maximum audible frequency.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of U.S. provisional application No. 62 / 652,908, filed on Apr. 5, 2018, U.S. provisional application No. 62 / 660,182, filed on Apr. 19, 2018 and U.S. provisional application No. 62 / 719,355, filed on Aug. 17, 2018, which are all incorporated herein by reference.BACKGROUND OF THE INVENTION1. Field of the Invention[0002]The present invention relates to a sound producing device, and more particularly, to a sound producing device capable of producing high fidelity sound with small size.2. Description of the Prior Art[0003]Speaker driver is always the most difficult challenge for high-fidelity sound reproduction in the speaker industry. The physics of sound wave propagation teaches that, within the human audible frequency range, the sound pressures generated by accelerating a membrane of a conventional speaker drive may be expressed as P∝S·A (eq-1), where S is the membrane surface area and A is the acceleration...

AI Technical Summary

Benefits of technology

[0010]It is therefore a primary objective of the present invention to provide a sound producing device capable of producing high fidelity sound with small size.

Problems solved by technology

Speaker driver is always the most difficult challenge for high-fidelity sound reproduction in the speaker industry.

All these additional components would occupy large space of the conventional speaker and will also raise its production cost.

Hence, one of the design challenges for the conventional speaker is the impossibility to use a single driver to cover the full range of human audible frequency.

Another design challenge for producing high-fidelity sound by the conventional speaker is its enclosure.

When the speaker enclosure's internal volume is not sufficiently large, this ratio rises and the pressure fluctuation inside the enclosure also rises, which causes nonlinearity or distortion of membrane movement near the min-max peaks of its movement range.

Such small enclosures will cause “enclosure compression induced distortion” which leads to sharply rising distortion as sound frequency goes lower and results in drastically degraded low frequency sound quality / fidelity.

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