I have a query regarding digital audio data. I want to seperate a 10 Hz sin wave from a digital audio data. sin wave of frequencies 10Hz and 20 Hz are explicitly added to the audio data for some purpose.i treid using filters but as i am getting lot of trouble designing and implementing the filter , as the sampling freq is fixed to be 44.1KHz and cant be changed.Please suggest me some other method. Also will resonance will be a better solution.
The quickest to program (but slowest to execute) would be to use a very long FIR filter. A carefully designed IIR filter would be much better - can't you make a standard design stable at these frequencies?