Boots – shoes – and leggings
Patent
1983-07-27
1987-12-01
Harkcom, Gary V.
Boots, shoes, and leggings
G06F 102
Patent
active
047108916
ABSTRACT:
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 sequencng circuit. In other embodiments of the invention, different memory arrangements ranging from a signal 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.
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Debus, Jr. Walter
Osborne Thomas L.
Siller, Jr. Curtis A.
American Telephone and Telegraph Company AT&T Bell Laboratories
Cameron Joseph A.
Harkcom Gary V.
Moran John Francis
Roberts Patrick E.
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