Subject: Re: [stella] Announcing "webTune2600" From: Doug Dingus <opengeek@xxxxxxxxx> Date: Fri, 12 Aug 2005 21:56:36 -0400 |
...hit reply too soon. I never saw much success on the 8bitters with any of that. On 8/12/05, Doug Dingus <opengeek@xxxxxxxxx> wrote: > > I did this long ago on the 8bitters. It's true @ 60Hz you will hear it. > You hear it up to fairly high frequencies. What happens is the ear > translates these into extra notes or it's heard as a pitch shift happening > rapidly if the frequency is low enough. > > Because our ears work in frequency / time domain, all of these things are > well outside our tolerances and we hear them. > > One thing that does work fairly well is to alternate the pitches every > cycle. --with some pattern, 112112112, 121212121, etc... Let each tone run > for exactly one cycle, then start the other one. I'm not sure the 2600 has > the muscle to actually get this done however. > > On 8/12/05, Manuel Rotschkar <cybergoth@xxxxxxxx> wrote: > > > > Hi there! > > > > >> The idea is to take two adjacent TIA notes that use the same > > >> distortion, and rapidly toggle between them on alternate frames. > > >> Call it "audio flicker"... I *think* the human ear will perceive > > >> this as a frequency halfway between the two, but I'm not sure... > > > > > > Don't underestimate the human ear. AFAIK it's harder to fool than the > > > human eye. > > > > Yup. At 60Hz you'll hear it vibrating. > > > > Techniques like that are normally rather used with the volume than with > > the frequency, so for example you can fake 5-Bit quality samples with > > the > > TIAs 4-Bit volume register by dividing each 5-Bit sample in two 4-Bit > > samples and feeding them to the TIA twice as fast as the 5-Bit > > sample-speed. > > > > For example > > > > 5-Bit value = 23 ( /2 = 11.5) > > > > Will result in > > > > 4-Bit val 1 = 11 > > 4-Bit val 1 = 12 > > > > (Hm... Isn't that called "oversampling"? :-)) > > > > Greetings, > > Manuel > > Archives (includes files) at > > http://www.biglist.com/lists/stella/archives/ > > Unsub & more at http://stella.biglist.com > > > > > Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://stella.biglist.com
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