Signal compression method and apparatus

A signal compression method, comprising:

• multiplying an input signal by a window function;
• calculating original autocorrelation coefficients of a windowed input signal;
• calculating an energy parameter according to a first coefficient of the original autocorrelation coefficients, and adjusting a white-noise correction factor according to the energy parameter;
• calculating a lag-window according to an expansion bandwidth;
• calculating modified autocorrelation coefficients according to the original autocorrelation coefficients, an adjusted white-noise correction factor, and the lag-window;
• calculating linear prediction coefficients according to the modified autocorrelation coefficients;
• and
• performing linear prediction for the input signal according to the linear prediction coefficients, calculating a residual signal, coding the residual signal, and outputting a coded bit stream.

A signal compression apparatus, comprising:

• a windowing unit, configured to multiply an input signal by a window function;
• an original autocorrelation coefficients calculating unit, configured to calculate the original autocorrelation coefficients of an input signal processed by the windowing unit;
• a bandwidth expanding unit, configured to adjust autocorrelation coefficient correction factors according to the original autocorrelation coefficients calculated by the original autocorrelation coefficients calculating unit, and calculate modified autocorrelation coefficients according to the original autocorrelation coefficients and the adjusted autocorrelation coefficient correction factors;
• a linear prediction coefficients calculating unit, configured to calculate the linear prediction coefficients according to the modified autocorrelation coefficients calculated by the bandwidth expanding unit;
• and
• a compressing unit, configured to code the input signal according to the linear prediction coefficients calculated by the linear prediction coefficients calculating unit, and output a coded bit stream.

A computer-readable medium having computer usable instructions stored thereon for execution by a processor to perform a method, wherein the method comprises:

• multiplying an input signal by a window function;
• calculating original autocorrelation coefficients of a windowed input signal;
• adjusting autocorrelation coefficient correction factors according to the original autocorrelation coefficients;
• calculating modified autocorrelation coefficients according to the original autocorrelation coefficients and the adjusted autocorrelation coefficient correction factors;
• calculating linear prediction coefficients according to the modified autocorrelation coefficients;
• and
• coding the input signal according to the linear prediction coefficients, and outputting a coded bit stream.