Otherwise known as frequency swifting
Very good.
The Taylorator – All Your Frequencies Are Belong to Us
11–20 of 101 posts
Re: The Taylorator – All Your Frequencies Are Belong to Us
#12Otherwise known as frequency swifting
"... frequency swifting" Get out of here. lol
Re: The Taylorator – All Your Frequencies Are Belong to Us
#13It's kinda refreshing that the "Legality" section is entirely concerned with power and frequencies, and not at all about the IP rights around Swift's music.
Ah, yeah. If this signal reaches your neighbor across the street, then maybe it's a "public performance" and you've got to get ASCAP and BMI licenses.
(And start taking requests.)
Re: The Taylorator – All Your Frequencies Are Belong to Us
#14It's kinda refreshing that the "Legality" section is entirely concerned with power and frequencies, and not at all about the IP rights around Swift's music.
Ah, yeah. If this signal reaches your neighbor across the street, then maybe it's a "public performance" and you've got to get ASCAP and BMI licenses. (And start taking requests.)
I'm going to need a device that allows requests to be made by calling any phone number.
Re: The Taylorator – All Your Frequencies Are Belong to Us
#15I was hoping this was a Tayloe Mixer[1] based SDR. The Tayloe mixer has excellent image and harmonic rejection.
In hardware, it would be easier to feed a 200 khz square wave into a diode and pull off the first 10 mhz of harmonics, low pass filter it, and mix that with 99.1 Mhz fm audio to get 88.1 to 108.1 Mhz fm at 200 khz spacing.
In software, you should be able to precompute a complete one cycle composite of -10 to +10 Mhz sine waves spaced 200 Khz apart. You could then loop this abitrary waveform and multiply it by an FM modulated source at 99.1 Mhz to get the same effect with a lot less processing power. This is the kind of thing GNU radio[2] is perfect for.
Precompute the FM signal for each of the songs in it's channel from -10 to +10 mhz for the length of the song. Store them as 16 bit IQ samples. Each file will be different length.
Loop though all of the songs, adding all of the components into a 32 bit I and Q sum. Round those to 16 bit values, or as appropriate for your SDR transmitter. You should have a very easy to compute 100 channel FM station with each channel separately timed.
Re: The Taylorator – All Your Frequencies Are Belong to Us
#16Ham radio has gotten me into more devious activities than I'd like to admit... but that's half the fun of experimentation :) Well done :)
From phone phreaking 40 years ago to FPV RC, I've found it to be a good indicator you're focusing on interesting emerging technologies when fellow early adopters in your new hobby say "Technically, this isn't even illegal... yet."
Re: The Taylorator – All Your Frequencies Are Belong to Us
#17> I'm not convinced that I'm operating anywhere close to peak efficiency. There may be some huge DSP-specific shortcut that I'm overlooking - I'm certainly no expert. But the current code works well enough. Something along the lines of taking the FM at baseband, transform to frequency domain, copy result n times and shift the coefficients to the right indices, much wider ifft to RF should work, right?
Regarding wideband signals muxing/demuxing
Yes, modulate then FFT for each signal, do the upconversion and mixing in frequency domain, then a single large IFFT to give the final bitstream. Roughly the inverse of this (single large FFT, filter in frequency domain, and IFFT individual signals) is how the 'wideband sdr' at utwente.nl works to support hundreds of simultaneous receivers on a single gpu.
The amateur radio folks working with these techniques on HPSDR hardware were calling the technique "Direct Fourier Conversion" but I do not know if they ever got to a releasable state. They spent an awful lot of time prematurely optimizing their stuff to run on the original Jetson board which was not really adequate to the task, so I think that was likely frustrating and killed momentum.
Re: The Taylorator – All Your Frequencies Are Belong to Us
#18It's kinda refreshing that the "Legality" section is entirely concerned with power and frequencies, and not at all about the IP rights around Swift's music.
Who cares? She basically splits Spotify’s revenue with Joe Rogan, she does okay.
Re: The Taylorator – All Your Frequencies Are Belong to Us
#19I remember going to the drive-in movie theater in the 80's. You had to tune your car radio to a specific frequency to hear the movie audio. If this device had existed back then, you wouldn't have needed to tune your car radio at all. I doubt the neighbors would have liked that though. As an aside, I remember being jealous of the neighbors because they got to watch all these movies for essentially free. The irony is t…
> You had to tune your car radio to a specific frequency to hear the movie audio.
This was great because it allowed for stereo. This also replaced the earlier idea of taking the speaker from the pole next to the driver's window, and then hanging from the window inside the car. This was just a mono speaker, but it was also right next to the driver's head. It reduced the drive-in's repair bills from people driving away before placing the speaker to its host stand (and other hooliganism)
*just to add some color
Re: The Taylorator – All Your Frequencies Are Belong to Us
#20Earlier quoted context omitted.
Ah, yeah. If this signal reaches your neighbor across the street, then maybe it's a "public performance" and you've got to get ASCAP and BMI licenses. (And start taking requests.)
I'm going to need a device that allows requests to be made by calling any phone number.
Good luck getting anyone to answer the phone to take the request. I'd suggest not naming your station "Spam Risk"