Patent ID: 9519619
Filing Date: 2016-12-13
CPC Classification: G06F,G10L

Claim Text:
1. A method for processing a raw audio signal to transform the raw audio signal from time domain to frequency or from frequency domain to time domain and performed by an audio signal processing device including a processor, comprising: obtaining an input signal corresponding to the raw audio signal; obtaining a twiddled signal by twiddling the input signal; pre-rotating the twiddled signal by using a first symmetric rotate factor to generate a pre-rotated signal, wherein the first symmetric rotate factor is (a·W performing a Fast Fourier Transform (FFT) of a L/2 point on the pre-rotated signal to generate a FFT transformed signal, wherein L is the length of the input signal; post-rotating the FFT transformed signal using a second symmetric rotate factor to generate a post-rotated signal, wherein the second symmetric rotate factor is (b·W writing a processed audio signal based on the post-rotated signal into a bitstream for transmitting or storing.