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Hi,

i would like to write a software of acoustic recognition in assembly language that will work under homemade 64bits 100% assembly OS , i can not consequently use call system or any known API(even if i could i would not). My board is MSI Z170-A PRO that integrates the component ALC892 here its datasheet http://www.hardwaresecrets.com/datas...aSheet_1.3.pdf. Is targeted first an anti aliasing filter before sampling and application of Fourier tranformation on this last. Is anti aliasing filter existing in sound card, microphone or anywhere in my motherboard ? Sampling i think i will not have any problem about it. A people who known well electrocnics said me there is everytime a component specificaly intented for Fourier transformation in sound card, is it correct ? If yes, under what calling could i find it in datasheet ? For the rest i have a clear vision of how to proceed, i only need information about these three points.

thank you in advance.

I highly doubt that sound cards/chips provide FFT or convolution that one can use (unless, it's some special-purpose hardware). As for the aliasing filter, I'd expect there one in front of the ADC and adjust automatically in response to changing the sample rate (however, it may be not automatic and/or it may be fused into the ADC and even be done digitally). You will likely need to write your FFTs and execute them on the CPU. (Note, I didn't follow the link, I'm speaking from my experience in embedded/telecom).

Thank you and the link was http://www.hardwaresecrets.com/datashee ... et_1.3.pdf