Variable equalizer

Details Variable equalizer Variable equalizer

1982-03-15

1984-07-10

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

333 18, 364724, H04L 2503

Patent

active

044596987

ABSTRACT:
A small-sized LSI variable equalizer is provided for accurately equalizing waveforms of signals transmitted via transmission lines of different distances. Variable equalizer units capable of stepwise changing the equalizing characteristics thereof are connected in series with each other with the variable equalizer units having variable step widths different from each other. An output signal of the variable equalizer units is compared with a reference signal to convert the comparison output signal to a digital signal which includes an upper order bits and lower order bits, whereby one of the equalizer units which has a wide variable step width is controlled by the upper order bits and the other of the equalizer units which has a narrow variable step width is controlled by the lower order bits.

REFERENCES:
patent: 3508153 (1970-04-01), Gerrish et al.
patent: 3742360 (1973-06-01), Ragsdale
patent: 3781720 (1973-12-01), Mueller
patent: 4336613 (1982-06-01), Hewes
patent: 4349889 (1982-09-01), Van den Elzen et al.
Takatori et al., "A New Equalizing Scheme for Digital Suscriber Loop" Nov. 1981, Conference NCT 8, IEEE National Telecommunication Conference Innovative Telecommunication E/5/1-6.

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