Bi-directional rate converting apparatus for converting a clock

Details Bi-directional rate converting apparatus for converting a clock Bi-directional rate converting apparatus for converting a clock

1994-02-01

1995-04-18

Groody, James J.

Television

Camera, system and detail

Combined image signal generator and general image signal...

348234, H04N 904

Patent

active

054082668

ABSTRACT:
Bi-directional rate converting apparatus up-converts a digital signal having a clock rate f.sub.B to a digital signal having a clock rate f.sub.A and also down-converts a digital signal having a clock rate f.sub.A to a digital signal having the clock rate f.sub.B. The digital signal having the clock rate f.sub.B is interpolated to produce a signal having the clock rate f.sub.A which is supplied to a filter during up-conversion. The digital signal having the clock rate f.sub.A is supplied to the filter during down-conversion, which after being filtered is thinned to produce a digital signal having the clock rate f.sub.B. The digital signal supplied to the filter is filtered in accordance with a frequency characteristic which has "0" points at frequencies of (f.sub.C /M)*x, where x equals an integer value from 1 to (M-1), and which also has "0" points at frequencies of (f.sub.C /L)*y, where y equals an integer value from 1 to (L-1). The value f.sub.C being the least common multiple of f.sub.A and f.sub.B such that f.sub.C =M*f.sub.A =L*f.sub.B, where M and L have respective integer values.

REFERENCES:
patent: 5095364 (1992-03-01), Asaida

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