Sound producing device

Abstract

A sound producing device includes at least one air pulse generating element. Each of the at least one air pulse generating element includes a membrane, a first air chamber and at least one opening, wherein a chamber pressure exists in the first air chamber. The membrane is actuated to change the chamber pressure of the first air chamber to generate a plurality of air pulses, the air pulses are propagated through the at least one opening, the air pulses produce a non-zero offset in terms of sound pressure level, and the non-zero offset is a deviation from a pressure value of an ambient pressureoutside the sound producing device.

Description

technical field [0001] The invention relates to a sound generating device, in particular to a sound generating device capable of producing high-fidelity sound. Background technique [0002] Speaker driver (speaker driver) is the most difficult challenge for high-fidelity sound reproduction in the speaker industry. Based on the physics of sound wave propagation, the sound pressure generated by accelerating the diaphragm driven by a conventional loudspeaker in the human audible frequency range can be expressed as P∝Sm·A(Equation-1), where Sm is the diaphragm surface area , A is the acceleration of the diaphragm. That is to say, the sound pressure P is proportional to the product of the surface area Sm of the diaphragm and the acceleration A of the diaphragm. In addition, the diaphragm displacement Dm can be expressed as Dm∝1 / 2·A·T 2 ∝1 / f 2 (Formula-2), where T and f are the period and frequency of the sound wave, respectively. The amount of air movement V caused by conven...

AI Technical Summary

Problems solved by technology

But if the size of the traditional speaker is limited, the quality / fidelity of the sound produced by the traditional speaker will drop sharply due to the above problems

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