Systems and methods for processing high frequency audio signal

An apparatus for encoding an audio signal, comprising:

• a computer-usable non-transitory storage resource, and
• a processor communicatively coupled to the storage resource, wherein the processor is configured to:
• filter an input audio signal into two output signals, wherein each output signal has a sampling rate that is equal to a sampling rate of the input audio signal, and wherein one of the output signals includes high frequency data;
• window the high frequency data by selecting a set of the high frequency data and windowing the selected high frequency data in time domain;
• determine a set of linear predictive coding (LPC) coefficients for the windowed data;
• generate energy scale values for the windowed data;
• and
• generate an encoded high frequency bitstream.

A method for encoding an audio signal, comprising:

• using one or more algorithms operating on a processor to filter an input audio signal into two output signals, wherein each output signal has a sampling rate that is equal to a sampling rate of the input audio signal, and wherein one of the output signals includes high frequency data;
• using one or more algorithms operating on the processor to window the high frequency data by selecting a set of the high frequency data and windowing the selected high frequency data in time domain;
• using one or more algorithms operating on the processor to determine a set of linear predictive coding (LPC) coefficients for the windowed data;
• using one or more algorithms operating on the processor to generate energy scale values for the windowed data;
• using one or more algorithms operating on the processor to detect a position and an amplitude for each of a plurality of peak values from the windowed data using the determined LPC coefficients;
• and
• using one or more algorithms operating on the processor to generate an encoded high frequency bitstream, wherein the energy scale values are generated by performing a fast Fourier Transform on the windowed data to generate an output and then by multiplying each frequency bin of the output with its complex conjugate.