History[ edit ] By the midth century, frequency modulation FM , a means of carrying sound, had been understood for decades and was being used to broadcast radio transmissions. Patent 4,,  is actually based on phase modulation , but the results end up being equivalent mathematically as both are essentially a special case of QAM. Several other models by Yamaha provided variations and evolutions of FM synthesis during that decade. Casio developed a related form of synthesis called phase distortion synthesis , used in its CZ range of synthesizers. It had a similar but slightly differently derived sound quality to the DX series.
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That year, a big batch of inexpensive, low parts count synth kits showed up at my doorstep after a long wait. My own take on the EFM diode filter, finished, tests working. My only EFM unbuilt kit that still has the all the parts NOS in bag, circa ! Still have sommore EFM, over 15 years old, unbuilt.
I imagine others out there do as well. But Tom still cops the basic idea. I think the VCF6C sounds pretty good. Maybe sounds really good! The EFM diode filter kit I built in is kind of wearing out: traces have corroded and have had to be replaced with bus wires, things like that.
For his occasional indolence, people tore Tom a new one in the audio forums, for his mistakes and long shipping delays.
It was horrible! Now looking back, I feel sorry for the guy and feel really stupid for being a dick Tom is or was? I can see him trying to stay afloat in his sweltering garage in Texas in July, gathering up parts, purchasing more caps from surplus places, having to dump out the bag to count the damn things again, while his wife yelled at him for not watering plants and letting their dumb dog pee on their shag carpet.
Tom must have loved audio DIY and electronics, why else would he be so prolific? But perhaps his passion drove him crazy. I am curious: where did Tom study electronics--he knew his way around--did he go to a university or was he self taught? Did anyone help him with any aspect of his work? Did he really have to wrap up all those kits by himself? Well, Tom, regardless: thanks! I know the work may have been too much, and we, the nascent audio forum trolls were hard to deal with, but I can say with certainty you did a damn great job on your take of the EMS diode filter.
Then get out your diode meter and measure each voltage drop across each diode without touching it. You want to match to a thousandth of a volt drop across the diode, so,. My buttload-odiodes. I have no idea where these came from but I have had this lifetime supply forever There are also 4. Seems to have worked, the filter sounds better after the match. There is one mistake in my PCB who am I to cast stones eh?
It took me about an evening to figure that dumb mistake out but once found: easily fixed Might have been omitted from the EFM site as well? There are lots of ways to do this; you can just use a pot if you want, so tie 5V to the "top leg" of the pot and omit the jack
10 of the best FM plugin synths
That year, a big batch of inexpensive, low parts count synth kits showed up at my doorstep after a long wait. My own take on the EFM diode filter, finished, tests working. My only EFM unbuilt kit that still has the all the parts NOS in bag, circa ! Still have sommore EFM, over 15 years old, unbuilt. I imagine others out there do as well.
Introduction to FM Synthesis
Frequency modulation synthesis