H - Electricity – 03 – K
Patent
H - Electricity
03
K
354/46
H03K 5/00 (2006.01) G06F 12/00 (2006.01) H04L 25/497 (2006.01)
Patent
CA 1211568
Abstract Digital Synthesis Technique For Pulses Having Predetermined Time And Frequency Domain Characteristics A digital synthesis technique provides pulse shaping in accordance with predetermined time domain and frequency domain constraints. In the technique, the informational content of a binary bit stream is used by an access circuit (12) to form address words for accessing a read-only-memory (13). The digital representations stored in the ROM (13) represent a superposition of temporally-displaced truncated impulse time functions) each weighted by the discrete transmission symbol levels of the analog output signal. The digital representations from two ROMs (13-1 and 13-2) are toggled by a sequencing circuit. In other embodiments of the invention, different memory arrangements ranging from a single ROM (142) to an array of ROMS (163-1 through 163-3 and 164-1 through 164-3) are respectively used to decrease circuit complexity. In a digital radio transmission application of the technique, this arrangement is economical; readily reproducible and stable since it obviates the need for conventional complex analog filters.
458520
Debus Walter Jr.
Osborne Thomas L.
Siller Curtis A. Jr.
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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