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Poliphase networks
A very interesting paper made by W.J. Niessen is available HERE about understanding and designing Sequence Asymmetric Polyphase Networks.
A useful spreadsheet macro to design them and useful tips to get an optimum result is available HERE.
One of the most interesting application of the poliphase networks is reported HERE: this is a method to modulate SSB a suppressed carrier without using ceramic or crystal filters. And HERE is reported the complete schematic.
Another interesting application is the analog audio pitch shifter and chorus generator. The complete schematic of this complex design is reported HERE, it was designed by a very big expert of electronics in general, his name is HENRY. If you need more info about this implementation you can find the link to Henry's homepage in the link section of this site.
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