Signal processing method for audio signal compensation
A signal processing method for audio signal compensation that corrects the high frequency audio signals while displaying music being removed with the high frequency audio signals is disclosed. When music being deleted with high-frequency audio signal is displayed, the deleted high-frequency audio signals are compensated by this method. At first, a first audio signal is inputted. Then increase output speed of the received first audio signal for outputting and producing a second audio signal. Sample a high frequency audio signal from the second audio signal and use this high frequency audio signal in compensation of the first audio signal, then output the compensated audio signal. Thus the quality of audio signals is improved and audio enjoyment for audience is increased.
1 . A signal processing method for audio signal compensation comprising the steps of:
inputting a first audio signal;
increasing output speed of the first audio signal for outputting and producing a second audio signal;
reading a high frequency audio signal of the second audio signal; and
using the high frequency audio signal in compensation of the first audio signal and then outputting the compensated audio signal.
2 . The method as claimed in claim 1 , wherein after step of inputting a first audio signal, producing a simulated audio signal that simulated the first audio signal and then outputting the simulated audio signal in speed higher than input speed of the first audio signal so as to produce the second audio signal.
3 . The method as claimed in claim 2 , wherein the first audio signal is signal in time domain and the step of producing the simulated audio signal further having a step—using a proper sampling rate to take samples from the first audio signal for obtaining a plurality of sampling points of simulated audio signal sequentially to produce a simulated audio signal; then outputting the simulated audio signal in speed higher than input speed of the first audio signal for producing the second audio signal.
4 . The method as claimed in claim 3 , wherein the step of producing the second audio signal further comprising a step—while outputting the second audio signal, using the same sampling rate to take samples from the second audio signal for obtaining a plurality of sampling points sequentially of the second audio signal, converting the second audio signal into audio signal in frequency domain, compensating the second audio signal in frequency domain, reading high frequency audio signal of the compensated second audio signal and adding the high frequency audio signal of the compensated second audio signal into the first audio signal to cover for high frequency losses.
5 . The method as claimed in claim 1 , wherein the first audio signal is an audio signal in time domain and sampling rate of sampling points of the first audio signal is already known; the step of increasing output speed of the first audio signal for outputting and producing a second audio signal further having a step: while outputting the second audio signal, using the sampling rate already known to take samples from the second audio signal for obtaining a plurality of sampling points sequentially of the second audio signal, converting the second audio signal into audio signal in frequency domain, compensating the second audio signal in frequency domain, reading high frequency audio signal of the compensated second audio signal and adding the high frequency audio signal of the compensated second audio signal into the first audio signal to cover for high frequency losses.
6 . The method as claimed in claim 4 , wherein the step of adding the high frequency audio signal of the compensated second audio signal into the first audio signal to cover for high frequency losses further comprising the steps of:
converting high frequency audio signal in frequency domain into high frequency audio signal in time domain;
replicating the high frequency audio signal in time domain and compensating it into the converted high frequency audio signal in time domain; and
adding the compensated high frequency audio signal in time domain into the first audio signal and outputting them together.
7 . The method as claimed in claim 5 , wherein the step of adding the high frequency audio signal of the compensated second audio signal into the first audio signal to cover for high frequency losses further comprising the steps of:
converting high frequency audio signal in frequency domain into high frequency audio signal in time domain;
replicating the high frequency audio signal in time domain and compensating it into the converted high frequency audio signal in time domain; and
adding the compensated high frequency audio signal in time domain into the first audio signal and outputting them together.
8 . The method as claimed in claim 1 , wherein the first audio signal is an audio signal for displaying a compressed file format for music.
9 . The method as claimed in claim 7 , wherein the compressed file format for music is MPEG-1 Audio Layer-3 (MP3).
10 . The method as claimed in claim 7 , wherein the compressed file format for music is advanced audio coding (AAC).