Digital phase shifting apparatus

Details Digital phase shifting apparatus Digital phase shifting apparatus

1994-06-27

1996-02-13

Jaworski, Francis

Surgery

Truss

Pad

12866007, A61B 800

Patent

active

054905117

ABSTRACT:
A digital phase shifting apparatus wherein the phase of a train of sampled digital-data is changed by a fine step shorter than a sampling period using a sampling signal with a fixed phase or a clock signal, the apparatus comprising:
a memory unit for storing the time-axis train of sampled digital data one after another at addresses corresponding to sampling times;
a memory read device for reading out digital data sampled at times ahead of a current sampling time by desired time differences from the memory unit one sampled data after another in synchronization with an operation to sample the time-axis train of sampled of digital data;
registers for holding sampled digital data read out from the memory unit, from a most recently read data to a data ahead of the most recently read data sampled data by a predetermined piece count; and
an interpolated-data generating device for summing up a plurality of sampled data held in the registers with a weight applied to each of the data to generate interpolated data at a desired arbitrary point of time within sampling intervals of the sampled digital data held in the registers.

REFERENCES:
patent: 3997772 (1976-12-01), Crochiere et al.
patent: 4787392 (1988-11-01), Saugeon
patent: 5088496 (1992-02-01), Bernard
patent: 5217017 (1993-06-01), Matsushima
patent: 5249578 (1993-10-01), Karp et al.
patent: 5268877 (1993-12-01), Odell
patent: 5345426 (1994-09-01), Lipschutz

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