Irelephant@lemm.ee to Asklemmy@lemmy.mlEnglish · 16 days agoWhat popular product do you think is modern day snakeoil?message-squaremessage-square531fedilinkarrow-up11arrow-down10
arrow-up11arrow-down1message-squareWhat popular product do you think is modern day snakeoil?Irelephant@lemm.ee to Asklemmy@lemmy.mlEnglish · 16 days agomessage-square531fedilink
minus-squareintensely_human@lemm.eelinkfedilinkarrow-up0·16 days agoNyquist, thank you. aren’t lost they fold into lower frequencies unless filtered out If by “fold into” you mean they add noise to and hence distort the readings on the lower frequencies, that’s correct. But that just takes it further from a perfect reproduction.
minus-squareHugin@lemmy.worldlinkfedilinkarrow-up0·15 days agoFrequency folding is the term used in DSP no need for quotes. The Nyquist frequency is commonly referred to as the folding frequency. And yes frequencies above the Nyquist folding frequency alias into lower frequencies. A simple low pass filter prevents this however. Properly filtered digital sampling produced a more accurate reproduction of the frequency range with less distortion then an analog signal.
Nyquist, thank you.
If by “fold into” you mean they add noise to and hence distort the readings on the lower frequencies, that’s correct. But that just takes it further from a perfect reproduction.
Frequency folding is the term used in DSP no need for quotes. The Nyquist frequency is commonly referred to as the folding frequency.
And yes frequencies above the Nyquist folding frequency alias into lower frequencies. A simple low pass filter prevents this however.
Properly filtered digital sampling produced a more accurate reproduction of the frequency range with less distortion then an analog signal.