Patent ID: 8917878

Claim:
A microphone inspection method, comprising steps of: (a) providing an under-test microphone, a reference microphone and a processing unit, wherein said under-test microphone and said reference microphone are in communication with said processing unit; (b) providing a speaker to issue a sound wave, so that said sound wave is received by said under-test microphone and said reference microphone, wherein after said sound wave is received by said under-test microphone, said under-test microphone issues a first digital signal to said processing unit, and said processing unit creates a first characteristic point distribution chart according to said first digital signal, wherein after said sound wave is received by said reference microphone, said reference microphone issues a second digital signal to said processing unit, and said processing unit creates a second characteristic point distribution chart according to said second digital signal, wherein each of said first characteristic point distribution chart and said second characteristic point distribution chart comprises plural characteristic points corresponding to respective normalized frequency values; and (c) calculating a characteristic point number difference between a number of said characteristic points of said first characteristic point distribution chart and a number of said characteristic points of said second characteristic point distribution chart within a specified normalized frequency value range, and judging quality of said under-test microphone according to said characteristic point number difference, if said characteristic point number difference is smaller than a threshold value, said under-test microphone is judged as a qualified product, wherein if said characteristic point number difference is large than said threshold value, said under-test microphone is judged as an unqualified product.