– A “Frequency Shifter”Shifts All Frequencies Additively by a Given Frequency Amount (Up or Down)
– the Spectral Content of the Source will Become Increasingly Distorted the More you Shift and Tends to Create “In-Harmonicity” (thus Altering the Frequency Relationship)
– e.g. a Source File has a 100Hz Tone and a 200Hz Tone, Frequency Shifting it with a Frequency of 100Hz will Make the 100Hz a 200Hz Tone and the 200Hz a 300Hz Tone
– Small Shifts also give you Deep Phasing Effects, whereas Larger Shifts are Interesting because of the Strange Harmonic Structures it Creates
– Technically it Modulates the Audio onto a High Frequency Carrier Wave (usually a Quadrature Oscillator as Carrier ), Filtered Off One Sideband and De-Modulates using a slightly Different Frequency
– it was Meant to be Used with Shifts by 5 to 10Hz to Reduce the Possibility of Feedback in a Live Audio Environment
– Not to be Compared with a Pitch Shifter which Shifts the Pitch by Musical Intervals and is Relative to the Notes Played (Preserves the Frequency Relationship)
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