AM radio receiver block

that thread was a riot, your contributions in particular were confusing (in a good way), like a lot of the permutations had very different behavior that warrants future study

and @colB 's ensemble pretty well demonstrates a virtual AM airspace imo

It was wild indeed, I think we all put our little bit to the general confusion 😁

i mean, it tunes and demodulates. those are the basic concepts of AM, which it does

had a good look around/ messed with it today. first went goblin mode and changed the rectifier stage to an envelope detector (laureano's decoupled one) but mistakenly added it later in the chain without first replacing the rectifier. however it bears mention because i obvserved the filtering and double rectification of envelope detector in this orientation could actually added in to sound a bit more closer to how i think of AM sounding on the receiving end, a bit stepped on

then i messed around with the demodulator section with the sine frequency delta or offset, cause its theory of operation vexed me. in turning it off i found out it works fine without it (only difference i noted was a couple less of those troublesome ringing frequencies in baseband/at audible range. i've never heard this expressed before but beat frequencies seem like a special case where adding waves together works non linearly and i've always wondered what the boundary of that is

this outcome is even more confusing than if the extra oscs were helping to demodulate, because if it's not now where is the demodulated baseband signal coming from?

like, i'd expect this if an impulse wave was used as carrier cause sidebands would be above and below every harmonic... but as i understand every 'station' centers on a single frequency of at least 50khz. so necessarily what this means, unless i've profoundly misunderstood something, rectification can kick islands of supersonic signal back to baseband no questions asked?

like, i'd assume if that was true it would at least be dependent on carrier frequency relative to sample rate

one thing i can say with certainty is i'd recommend fewer stations for more headroom in bandwidth for each indiv station, , as i see currently their range is bandlimited at 2k, well below around 3.5k generally considered necessary for solid speech transmission/recognition

oh yeah forgot to add the file lol lmao

Cool! Lots of interesting textures with the stepped on and env demod filtering,sounds very authentic too...i feel i have heard this type of distortion often in AM...squared-rectifier type of.

This is brilliant!!! Sounds very authentic, you should definitely upload it (with embedded samples) to the user library! :)

This is what I meant by redundant components in my original model. There's some stuff there that may or may not be correct, but it's difficult to be sure with my level of understanding, because it's not actually modulating, then transmitting through the airwaves, then receiving and demodulating... it's just a hacked Reaktor model :-)

I wasn't going for headroom, I wanted there to be interference between stations etc. and less distance to tune on the dial to go from one to the other... in order for this to be more interesting/playable as a tool for sound design. Almost like a cartoon caricature of what a good radio might have sounded like. Like some of those exaggerated tape effect plugins that produce a sounds that would have caused any real tape machine to be binned or sent for repair :-D

I like the sound of the distortion you added. Definitely adds something when used at a subtle setting.

Along with the distortion, I would like more ideas for adding noise and 'authentic' sounding interference. So characterful crackle and hum at different points on the dial... I did experiment with various types of broad band noise, but it would be interesting to get some stuff at narrower bands that might interfere with channels... The sort of thing that might have been caused by electrical storms etc. Not entirely sure how to go about that though.