Patent ID: 8396716

Claim:
An audio signal compression method in a communications device including a processor, the method comprising: multiplying, by the processor, an input audio signal by a window function for obtaining a windowed audio signal; calculating, by the processor, an original autocorrelation coefficient particular to the windowed audio signal, the windowed audio signal having an autocorrelation coefficient correction factor; adjusting, by the processor, the autocorrelation coefficient correction factor in accordance with the original autocorrelation coefficient for obtaining an adjusted autocorrelation coefficient correction factor; modifying, by the processor, the original autocorrelation coefficient in accordance with the adjusted autocorrelation coefficient correction factor for obtaining a modified autocorrelation coefficient; calculating, by the processor, a linear prediction coefficient in accordance with the modified autocorrelation coefficient; coding, by the processor, the windowed audio signal in accordance with the linear prediction coefficients for generating an audio coded bit stream; and outputting, by the processor, the audio coded bit stream.