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<blockquote data-quote="John Roberts" data-source="post: 130315" data-attributes="member: 126">Re: Basic principles of samplingThis is probably way TMI for the OP but comes to mind when talking about starting and stopping samples. I got painfully introduced to this mechanism in one of my early electronics gigs back in the &#039;70s. I was working for a company that performed pitch shift for blind people listening to talking book tape recordings speeded up to 2x normal or more.&nbsp; Very simply the speeded up signal was read into a memory at the fast high pitch rate, then read back out at the slower lower normal pitch rate. Since this was occurring at 2x or more of real time for the recording, redundant data would have to be discarded between samples and then the displayed samples spliced together. Since these samples were not contiguous in time, the audible artifacts created by stopping and stopping these samples (effectively multiplying them) at random times was very objectionably and annoying. This same mechanism is at play in shunt/switch type noise gates and to a lesser extent when a compressor multiplies a dry signal times a changing gain effectively multiplying the waveform by the gain. This will hurt you head to think about it too much, but when designing gear it helps to understand where the beeps and farts are coming from... when trying to eliminate them.&nbsp; JR</blockquote>

[QUOTE="John Roberts, post: 130315, member: 126"] Re: Basic principles of sampling This is probably way TMI for the OP but comes to mind when talking about starting and stopping samples. I got painfully introduced to this mechanism in one of my early electronics gigs back in the '70s. I was working for a company that performed pitch shift for blind people listening to talking book tape recordings speeded up to 2x normal or more. Very simply the speeded up signal was read into a memory at the fast high pitch rate, then read back out at the slower lower normal pitch rate. Since this was occurring at 2x or more of real time for the recording, redundant data would have to be discarded between samples and then the displayed samples spliced together. Since these samples were not contiguous in time, the audible artifacts created by stopping and stopping these samples (effectively multiplying them) at random times was very objectionably and annoying. This same mechanism is at play in shunt/switch type noise gates and to a lesser extent when a compressor multiplies a dry signal times a changing gain effectively multiplying the waveform by the gain. This will hurt you head to think about it too much, but when designing gear it helps to understand where the beeps and farts are coming from... when trying to eliminate them. JR [/QUOTE]

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