Patent ID: 9204233
Filing Date: 2015-12-01
Classification: H04R

Abstract:
1. An audio testing method for testing an audio signal, the method comprising: providing a computer system having a sound card connected to an audio-emitting device; receiving an audio signal from the audio-emitting device; sampling the audio signal for obtaining sampling points; storing the sampling points in a memory system of the computer system, wherein the sampling points are divided into a plurality of groups, the sampling points sampled in each continuous M milliseconds (ms) form one of the groups of sampling points, and M ranges between 20 and 30 ms; processing each group of sampling points stored in the memory; taking differences between amplitude values of each two adjacent sampling points via subtraction; taking absolute values of all the differences and adding up all of the absolute values, and processing an average value of all the absolute values; determining if the average value is less than N, wherein N ranges between 5-20; determining that the audio signal has been distorted upon the condition that the average value is less than N; and determining that the audio signal has not been distorted upon the condition that the average value is equal to or more than N.