Digital loop conferencing signal correction arrangement
AssigneeBell Telephone Laboratories, Incorporated
InventorCharles R. Baugh
Life of this patent
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Abstract
There is disclosed an arrangement for removing error signals on a loop conferencing system. A decay circuit is inserted in the conference loop and all signals passing through the decay circuit are reduced by a constant factor. Those signals which are not regenerated by the valid inputs to the loop are reduced to zero within a few cycles.
Claims7
An error correction circuit for use in a continuous loop communication system where a plurality of communication stations have access thereto via interface circuits associated with each station,
- said error correction circuit comprising
- means for sampling the combined loop signal at a particular location within said loop,
- signal reduction means,
- means for modifying each said sampled signal by said signal reduction means so as to provide a new combined signal, said combined signal having a smaller absolute mathematical value than said sampled signal, and
- means for substituting on said loop said combined signal for said sampled signal.
In combination, a communication system wherein a plurality of interface circuits are operative to place communications on a common bus interconnecting said interface circuits and wherein said communications pass through said interface circuits in sequential fashion, an error control circuit inserted in said bus such that all said communications pass through said error control circuit, said error control circuit comprising,
- means for sampling the communication signal passing through said circuit,
- signal reduction means,
- means for modifying each said sampled signal by said signal reduction means so as to produce a new combined signal, said combined signal having a smaller absolute mathematical value than said sampled signal, and
- means for substituting on said bus said combined signal for said sampled signal.
An error correction circuit for use in a continuous loop communication system where a plurality of communications stations have access thereto via interface circuits associated with each station and connected in said loop, said error correction circuit being adapted to be connected in series with said loop and comprising sampling means for sampling an applied loop signal and signal reduction means operable for reducing each said sampled signal and for affording an output signal for application to said loop in place of said sampled loop signal.
Dependencies are inferred from the claim text.