On Sep 10, 2010, at 9:29 AM, John P <johnp299792@...> wrote:
The circuits *create* a link between volts and sound. That is the genius of voltage control.
Back in the 50s, an oscillator was a box with knobs on it. To change the pitch you turned a knob.
In the 60s, Bob Moog & Don Buchla added voltage control of oscillators, filters, and amplfiers.
This took some extra circuitry to add the volts together from different inputs and use it to change the
behavior of the module.
Since your ear responds exponentially to pitch and loudness, designers also had to make volts control the module
exponentially. The one volt per octave standard was born, making pitch interval changes natural & easy. Add or subtract a little voltage, get a predictable pitch interval change.
On 9/10/2010 3:00 AM, roelelec wrote:Hi Yulian,
Thanks for your welcome input!
Your example is very clear, I understand it perfectly. I will try this. To get a better picture and sound picture of AC and DC coupling.
Are different couplings of waveform outs of an oscillator uniquely Serge? Or is this common practize among other brands as well?
One question still begs for an answer: why is it then not important if in/out's are DC or AC coupled when they produce signals in the audio region? When we take your example of the VCA again. When we audio rate modulate that with an osc we get amplitude modulation at 20 hz or higher. Does this mean that amplitude modulation sounds practically the same with DC and AC coupled audio signals?
Let's try this too! Meaby were still in for a nice suprise.
Absolutely, when Rex mentions something, it's always significant.
And coming back to volt and hz. I now understand that volt and hz are part of two different worlds; you can't bring them together.
Hertz is correlated to sound, cause frequency is the number of cycles per second which is expressed in hertz. And within the range of 20 hz - appr. 18 khz we can hear this as sound.
But what about volt? I want to understand this musically. Say a signal raises another signal by +5 volt, the output of this modulation we can hear soundwise. So there must be a link between voltage and sound, like there is between hertz and sound!
Can someone explain this?
Cheers,
Roel