Pulse or digital communications – Repeaters – Testing
Patent
1985-02-19
1986-07-22
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
307359, 340347AD, 340347CC, 375 39, 375 76, H03M 106, H03M 112
Patent
active
046023747
ABSTRACT:
An input multi-level amplitude signal of 2.sup.M levels is supplied via a DC level controller to an AD converter for conversion into an N-bit (N being an integer greater than M) digital signal, and M high-order bits of the digital signal are provided as decided outputs. It is decided by a decision means whether a deviation of the DC level of the multi-level amplitude signal at the input side of the AD converter is in excess of a predetermined value. When the deviation of the DC level is decided less than the predetermined value, the outputs of bits less significant than the Mth bit in the digital signal are integrated for input as a DC level control signal into the DC level controller, correcting the deviation of the DC level. When it is decided by the decision means that the deviation of the DC level is greater than the predetermined value, at least one of the M high-order bit outputs in the output digital signal is integrated for input as a DC level control signal into the DC level controller, correcting the deviation of the DC level.
REFERENCES:
patent: 4355402 (1982-10-01), Kromer, III et al.
patent: 4410876 (1983-10-01), Sawagata
patent: 4415882 (1983-11-01), Akazawa et al.
patent: 4549165 (1985-10-01), Brian
patent: 4560940 (1985-12-01), Schans
Nakamura Yasuhisa
Saito Yoichi
Nippon Telegraph & Telephone Public Corporation
Safourek Benedict V.
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