App for processing and visualizing IQ data from rtl_tcp.
https://developer.apple.com/documentation/accelerate/vdsp/discrete_fourier_transforms/signal_extraction_from_noise https://developer.apple.com/documentation/accelerate/vdsp/discrete_fourier_transforms/equalizing_audio_with_vdsp
https://www.objc.io/issues/16-swift/rapid-prototyping-in-swift-playgrounds/ https://stackoverflow.com/questions/14872635/fft-with-ios-vdsp-not-symmetrical
https://github.com/hyperjeff/Accelerate-in-Swift/blob/master/FFT.playground/contents.swift https://github.com/hyperjeff/Accelerate-in-Swift/blob/master/vDSP.playground/contents.swift
https://github.com/christopherhelf/Swift-FFT-Example/blob/master/ffttest/fft.swift