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 whish for fake keyboard
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mathis Member |
posted 09 January 2004 05:20
 
I´d like to have a note hold/sustain button. would free the mouse for the vcs. Still no patience to learn twiky. Is there a tutorial somewhere which shows a really simple way to post in twiky? I mean *really* simple, like here. Happy new year! IP: Logged |
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pete Member |
posted 09 January 2004 07:12
Hi Mathis Re Tweaky All I do is go to the page I want to add text to, press the edit link at the top of the screen , add my text , then copy and paste the bit below the text window that has my name and the date, into the text field in the right place, and then press the save button. [This message has been edited by pete (edited 09 January 2004).] IP: Logged |
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mathis Member |
posted 09 January 2004 08:04
Hi Pete, ja, I just posted my first lines. Thanks. Ah, Pete, I just did some experiments with oscillators and also with your Surbiton Oscillator. What´s the exact difference to the plain Oscillator? Just a reduction of parameters? Best regards, IP: Logged |
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pete Member |
posted 10 January 2004 07:16
Hi Mathis The difference is sound quality. When you try to generate wave forms like square , triangle or saw tooth in the digital domain you get aliasing when the frequency is not an exact relationship to the sample rate frequency. Consider a square wave at 11025 hz when the sample frequency is 44100 hz. This will sound fine because the square will be even, but if the frequency was 11020 hz then wave forms pulse width would have to change (not in a smooth way) every 1/5 of a second . This will create a growl sound added to the signal. You can not use anti aliasing filters because this would have to be done before conversion to digital and as this is already in the digital domain the sound is already damaged. What the surbiton oscillator does is generate the signal at an exact division of the sample frequency so that it is clean, then it is put through an anti aliasing filter and then pitch shifted to the frequency you want, by recording this filtered signal to a ram loop and loop reading it out at a rate that corresponds to the frequency you want. Because we know what the final frequency will be when it's pitch shifted we can filter out just the frequencies (prior to shifting ) that will reach the sample rate and cause aliasing. Note if the desired out put frequency goes up, the cut-off frequency of the filter goes down. It takes a bit of thinking about but it is the right way round. I hope this makes sense Pete By the way tomorrow I'll be moving out of Surbiton so maybe I should rename it to the Maldon Manor oscillator but it doesn't have the same ring. [This message has been edited by pete (edited 10 January 2004).] In Ben's P5 synth, the surbiton oscillator is openned out unlike the one in the prototypes that only has one waveform and is very restricted on the control front. [This message has been edited by pete (edited 10 January 2004).] IP: Logged |
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SSC Administrator |
posted 10 January 2004 12:26
"Maldon Manor oscillator but it doesn't have the same ring." I don't know... It sounds like the Lord of the Oscillators--which does have a ring to it. IP: Logged |
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Cliff White Member |
posted 10 January 2004 22:45
"Maldon Manor oscillator but it doesn't have the same ring." I don't know... It sounds like the Lord of the Oscillators--which does have a ring to it. Thank you; I'll be here all week! Don't forget to tip your waitress....... IP: Logged |
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mathis Member |
posted 15 January 2004 14:06
Hi Pete, thanks for your explanation, makes absolutely sense to me. All the best, IP: Logged |
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