Apparatus and means for high speed digital frequency shifting

Details Apparatus and means for high speed digital frequency shifting Apparatus and means for high speed digital frequency shifting

1982-02-08

1984-01-03

Heyman, John S.

Pulse or digital communications

Repeaters

Testing

375112, 364900, H03K 500, H03L 700

Patent

active

044244924

ABSTRACT:
A frequency converter for a complex digital input provides a shift of frequency without the necessity of time-consuming and expensive numerical multiplication. Furthermore, by combining the conversion process with digital filtering, the frequency of the converted output can be halved. The output can be resampled and reapplied to the novel converter for repeated shifts in frequency and reduction of bandwidth in the case of down-conversion.

REFERENCES:
patent: 3564414 (1971-02-01), Ebert
patent: 3740655 (1973-06-01), Dickey
patent: 3792360 (1974-02-01), Carlow
patent: 4025720 (1977-05-01), Pachynski
patent: 4167707 (1979-09-01), Gemp

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