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Tom in St Louis Park Minnesota and youamp;#39;d think St Louis Park would be in St Louis but it ainamp;#39;t itamp;#39;s in Minnesota all right um the instant jumps from one volume level to another in digital audio can create highfrequency analog artifacts so to make sure we donamp;#39;t hear those we use a low pass filter that for example only allows frequencies below 20 khz to pass through uh hence the low pass if thatamp;#39;s even remotely accurate I think I get the noise reduction part of digital audio what I donamp;#39;t get however is how a low pass filter uh Smooths out the signal a 1 KZ tone for example created in analog digitized into PCM and then converted back to analog does not show up as a stair step or a lollipop pattern lollipop okay on an oscilloscope looking at the deck analog output the sine wave on the analog output is perfectly smooth how does this low pass filter do that is it the capacitor in the low pass filter that Smooths the signal by controlling the at
