Patent ID: 8271113
Filing Date: 2012-09-18
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 X milliseconds (ms) form one of the groups of sampling points, and X ranges between 5 and 20 ms; processing each group of sampling points stored in the memory; determining if there are equal to or more than Y number of maximum sampling points in each group of sampling points, wherein the amplitude values of the maximum sampling points are equal to the maximum amplitude value of the waveform of the audio signal, and wherein the step “determining if there are equal to or more than Y number of maximum sampling points in each group of sampling points” comprises: taking maximum amplitude values from each group of sampling points, and determining if the absolute values of the maximum amplitude values are more than the absolute values of the amplitude values of the maximum sampling points; determining if the sampling points with maximum amplitude values are equal to or more than Y number of continuous sampling points upon the condition that the absolute values of the maximum amplitude values are equal to or more than the absolute values of the amplitude values of the maximum sampling points; determining that there are Y or more than Y number of continuous sampling points with maximum amplitude values upon the condition that there are Y or more than Y number of continuous sampling points; determining that there are less than Y number of continuous sampling points with maximum amplitude values upon the condition that there are less than Y number of continuous sampling points; and determining that there are less than Y number of continuous sampling points with maximum amplitude values upon the condition that the absolute values of the maximum amplitude values are less than the absolute values of the amplitude values of the maximum sampling points; determining if there are equal to or more than Y number of minimum sampling points in each group of sampling points, wherein the amplitude values of the minimum sampling points are equal to the minimum amplitude value of the waveform of the audio signal, and wherein Y ranges between 3 and 10; determining that the audio signal has been distorted upon the condition that there are equal to or more than Y number of continuous maximum sampling points in each group of sampling points; determining that the audio signal has not been distorted upon the condition that there are less than Y number of continuous maximum sampling points in each group of sampling points; determining that the audio signal has been distorted upon the condition that there are equal to or more than Y number of continuous minimum sampling points in each group of sampling points; and determining that the audio signal has not been distorted upon the condition that there are less than Y number of continuous minimum sampling points in each group of sampling points.