Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
Patent
1992-02-27
1993-06-01
Schreyer, Stafford
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Of trunk or long line
H04M 332
Patent
active
052167020
ABSTRACT:
A digital signal processor is provided with the facility to measure accurately, and nonintrusively, the levels of noise and/or speech signals appearing on an in-service network connection.
REFERENCES:
patent: 4363938 (1982-12-01), Daaboul et al.
patent: 4552996 (1985-11-01), de Bergh
AT&T Bell Laboratories
Luludis F. B.
Schreyer Stafford
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