Patent ID: 9699548
Date: 2017-07-04
CPC Classifications: H04R

Claim:
1. A method for enhancing frequency response of a miniature loudspeaker module, wherein the method comprises the steps of: additionally providing a passive driver in a cavity where an active driver of the miniature loudspeaker module is located, the passive driver has a vibrating diaphragm, and the passive driver and the active driver radiating together; wherein, after the passive driver is additionally provided in the miniature loudspeaker module, an amplitude characteristics of a vibrating diaphragm of the active driver shows a local dip frequency on frequency bands below a resonant frequency point F performing, according to the amplitude characteristics of the vibrating diaphragm of the active driver of the miniature loudspeaker module additionally provided with the passive driver, matching enhancement to an input audio signal of the active driver; wherein the performing, according to the amplitude characteristics of the vibrating diaphragm of the active driver of the miniature loudspeaker module additionally provided with the passive driver, matching enhancement to an input audio signal of the active driver comprises: filtering out the input audio signal below a first frequency point which is a frequency point below the Fb, to filter out signals having an amplitude beyond an allowable range of the vibrating diaphragm of the active driver on frequency bands below the Fb; performing band-pass filtering and enhancement to the input audio signal within a certain frequency band taking the Fb as a central frequency point, to realize low-frequency descending and bass enhancement; performing notch filtering to the input audio signal within a certain frequency band taking the F performing high-pass filtering and enhancement to the input audio signal above a second frequency point higher than the F