Patent ID: 9196254
Filing Date: 2015-11-24
Classification: G10L

Abstract:
1. A method for implementing quality control for one or more components of a digital audio signal received from a communication device, the method comprising the steps of: selecting a sample of the digital audio signal being received from the communication device; filtering the selected sample through a high pass filter and computing a power measure for each sample by using the output of the filtering operation; averaging the power measure over a period of time to obtain a power level; identifying different frequency components of the selected sample, computing discrete Fourier transform (DFT) values at these identified frequency components, taking the absolute value of the DFT values, and storing the DFT values in a first array; for each of the identified frequency components, calculating histogram bins, with a value higher than a specified threshold; summing UP the histogram bins with the value higher than the specified threshold and storing the results in a second array; finding a difference between two adjacent array elements to determine corresponding difference signals based on the second array; calculating a standard deviation of the difference signals; defining a bottom threshold for the power level; classifying any value of the deviation that is above the bottom threshold as a music component and classifying any value of the deviation that is below the bottom threshold as a speech component; grading the classified frequency components based on one or more quality parameters; and modifying the audio signal by utilizing one or more quality control mechanisms based on the grading of the classified frequency components.