Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Patent
1994-04-26
1996-04-09
Chin, Stephen
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
379 88, 379 67, 3642417, 3642451, H04B 166
Patent
active
055068723
ABSTRACT:
A signal compression-selection arrangement (19) dynamically trades off signal storage capacity against signal quality, by sacrificing capacity in favor of signal quality whenever capacity is plentiful and sacrificing quality in favor of capacity whenever capacity is scarce. In a messaging system (FIG. 1), the arrangement monitors the amount of storage (14, 15) that is presently free and available for storing new messages, either on a system-wide or per-mailbox basis, and automatically selects a higher compression rate (13) than a presently-applied compression rate (13) to be applied to newly-received messages as the amount of free storage falls below each predetermined threshold. Storage capacity may be freed up by re-compressing (FIG. 3) at the new, higher, compression rate those stored messages that were previously compressed at a lower compression rate.
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patent: 4730348 (1988-03-01), MacCrisken
patent: 4791660 (1988-12-01), Oye et al.
patent: 4837798 (1989-06-01), Cohen et al.
patent: 5133004 (1992-07-01), Heileman, Jr. et al.
patent: 5276898 (1994-01-01), Kiel et al.
AT&T Corp.
Chin Stephen
Trainor J. J.
Volejnicek D.
Webster Bryan E.
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