Shifting of the frequency spectrum of an audio signal is a powerful technique for modifying the qualities of musical sounds. The subject design brings frequency shifter (-Klangumwandler-) technology up to current professional audio standards. Performance specifications include 70-dB dynamic range, 40-dB rejection of unwanted sidebands, amount of frequency shift continuously variable through as much as -5000 to +5000 Hz, simultaneous availability of positively and negatively shifted signals, and variable threshold squelch.
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https://aes2.org/publications/elibrary-page/?id=2059
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