So I understand that AM radio encodes the sound signal in the radio wave by amplitude modulation, so as the radio wave is sent out, the amplitude (signal strength) - controlled by how much power you put into the transmitter - varies in each wave.
What I don't understand is that since the strength of a radio wave will vary with the distance you are from the transmitter, why doesn't AM radio have interference or fail when you are moving? Especially in a car or a plane? Wouldn't the reduction in the signal strength as you move wreck the amplitude modulated signal?
Why does shortwave use am rather than fm? (I know fm would require new receivers and transmitters)
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Love the videos on Fourier transformation and Fourier series. Same line wrt adding sines for saw/square in eg https://www.youtube.com/watch?v=k8FXF1KjzY0&feature=youtu.be
would love some examples/videos expanding this to eg amplitude modulation which I expect would be like 2 vectors in origin with different frequency and result the scalar product (dot product) would give a great visual giving some basics for sound synthesis. envelope then one of the vectors not taking full circle etc..
Same wrt frequency modulation. Vector spinning with a varians in frequency. Or differently a variation in the time, in the 'paper roll we draw on', in the medium/the speed of sound. How to illustrate this the best way?
Shouldn’t there be audible sidebands when you modulate the amplitude of an oscillator with an LFO (in a musical synthesizer)? I didn’t really seem to notice any of them yet.
I tried making a “ring mod” patch today on the digitone by using the LFO to modulate the amplitude sustain and assigning the speed of the LFO to the mod wheel. However, I noticed that moving the mod wheel past a certain point did not affect the ring mod’s frequency. I am curious about why this would be, is it possible that the digitone has an upper limit to the frequency that the sustain parameter can be modulated?
If you could put "fruity amplitude modulation" onto a track, and have it take the amplitude of the amplitude (not peak) of the input and convert it to automation, and then link it to any knob, and bam, you have AM for anything, like link it to cutoff in free filter, and you have yourself, "Filter modulation".
It would be amazing for textures, and timbres, and you would have endless possibilities for sound design.
Even 'Flanger Feedback Modulation!
FFM!
While looking for images for frequency modulation I noticed that different sources provide different illustration on how frequency modulation works, while some of them say the modulated frequency increases with the decrease in the message amplitude, others say otherwise.
These are multiple images I collected regarding the matter: https://imgur.com/a/7tqJBE5
So? Which is correct and which is not? If both are, why?
Hi All,
Possibly a stupid question, but when you've been staring at a build for ages you start to lose your mind. I need your fresh eyes on this:
I've got an old (and I mean first-run production OLD) VX22a running fairly smoothly on its own. However I'm attempting to interface the control circuitry from that with my brand new Rev-C VXFE (firmware 0.4 not that it matters). The goal in mind is strictly to run some parallel stress-testing, but I need the Thurn-Hewitt fields to collapse in perfect sync between them, otherwise the measurements are useless.
I'd like to keep the logic control communication wireless, as the 22a tends to sink HUGE amounts of current when the gyroscopic stabilization loses coupling with the clock source. (Believe it or not, still using a crystal oven for the temperature-compensated oscillator in there!)
I figured using SHF microwave between them would be an easy solution, and seeing as it's just for test purposes it doesn't really matter. Or so I thought. Here's where I'm at:
I've rigged a pair of 7GHz transducers (kind of like a miniature skirt antenna, except the skirt is electrically isolated from the center conductor), the Rev-C is center-tapped to the 'skirt' wires, the 22a is bottom fed to the center conductor. Due to the physical proximity, I've used polytetrafluoroethene paste as a dielectric.
I used my time-domain reflectometer, and it showed perfect impedance match. 50 j0 EXACTLY at 7Ghz. However, whenever I try to send any control signals, the VSWR goes through the roof.
I plotted the impedance on a Smith chart, everything looks nominal. I'm using the new Wye-type rectifier bridge for demodulation, I've got the stock Harden-Sturley control signal generator on the Rev-C.
What am I doing wrong?? This should be one of the EASIEST VX projects I've done, and yet I'm caught on this simple, stupid detail.
