A Hilbert-Transformer Frequency Shifter for Audio
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In contrast to conventional pitch-shifting effects which attempt to maintain harmonic relationships in the signal, a frequency shifter translates all the component frequencies of the input signal by an equal amount, disrupting the harmonic relationships and radically altering the sonic qualities of the signal. Ring modulation is a generalization of double-sideband suppressed-carrier modulation, and the frequency shifter is equivalent to a single-sideband modulator. Applications of the frequency shifter include the creation of bizarre distortions, phaser, and rotating speaker effects. An implementation is presented that is suitable for fixed-point digital hardware.
[1] J. Justice,et al. Analytic signal processing in music computation , 1979 .
[2] Alan V. Oppenheim,et al. Discrete-Time Signal Pro-cessing , 1989 .
[3] P. Vaidyanathan. Multirate Systems And Filter Banks , 1992 .
[4] P. K. Chaturvedi,et al. Communication Systems , 2002, IFIP — The International Federation for Information Processing.
[5] Julius O. Smith,et al. A Sine Generation Algorithm for VLSI Applications , 1985, ICMC.