Signal distribution with user-configurable ground-loop control

Details Signal distribution with user-configurable ground-loop control Signal distribution with user-configurable ground-loop control

1993-11-19

1997-05-06

Kuntz, Curtis

Electrical audio signal processing systems and devices

One-way audio signal program distribution

381124, H04B 300

Patent

active

056278985

ABSTRACT:
A signal distribution system includes module-receiving means whereby a user may select isolation circuitry to eliminate ground-loop-induced interference. The invention is particularly suited to signal distribution systems characterized in having large numbers of equipment pieces interconnected over communication paths of a distance conducive to ground-loop effects, such as configurations associated with audio and/or video magnetic-tape duplication. In the preferred embodiment, each piece of equipment susceptible to such ground-loop effects includes on a primary circuit board within its enclosure a module-receiving connector to which one of a plurality of user-selectable circuitry-containing modules attaches. The equipment may be shipped with a module in the form of jumpers, and this module may be left in place or later added in the event that no interference is apparent. However, in accordance with the level of interference observed, the user may replace the jumper module with a module containing various types of isolation circuitry, including transformers and optoelectronic isolation means, the latter of which may be used in conjunction with cabling or communication paths in the form of optical fibers.

REFERENCES:
patent: 4320388 (1982-03-01), McCarthy et al.
patent: 4429187 (1984-01-01), Butcher
patent: 4847507 (1989-07-01), Matson et al.
patent: 4979218 (1990-12-01), Straham
patent: 4996531 (1991-02-01), Kotter et al.
patent: 5247297 (1993-09-01), Seabury et al.
patent: 5313524 (1994-05-01), Van Hulle et al.

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