Frequency translation means

Details Frequency translation means Frequency translation means

1979-01-04

1981-01-27

Heyman, John S.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455 20, 455 22, 328 39, 328159, 331 37, H03B 2101

Patent

active

042478227

ABSTRACT:
A method and means for translating frequencies, as for example, to correct a frequency error .DELTA.f.sub.d introduced into a carrier signal of frequency f.sub.c, comprising means for dividing the resultant signal frequency (f.sub.c +.DELTA.f.sub.d) by N, resulting in a divided-down frequency (f.sub.c /N+.DELTA.f.sub.d /N), with .DELTA.f.sub.d being reduced to .DELTA.f.sub.d /N, and then heterodyning the divided-down frequency with signal of frequency (f.sub.c +f.sub.c /N) to produce a resultant signal of frequency (f.sub.c +.DELTA.f.sub.d /N), the frequency error remaining at its low, divided level .DELTA.f.sub.d /N. In the case of two or more signals spaced apart by predetermined frequency spacings, such frequency spacings can be reduced to predetermined values by dividing said signals by a common divisor M with the frequency spacings also being divided by M and then heterodyning the divided-down frequencies upwardly to desired frequencies with the frequency spacings remaining at their desired reduced values.

REFERENCES:
patent: 2407213 (1946-09-01), Tunick
patent: 2852671 (1958-09-01), Cohen
patent: 3317909 (1967-05-01), Waetjen
patent: 3325736 (1967-06-01), Waetjen
patent: 3886452 (1975-05-01), Seidel

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