Pulse or digital communications – Repeaters – Testing
Patent
1981-02-05
1982-11-16
Bookbinder, Marc E.
Pulse or digital communications
Repeaters
Testing
1791702, 333 18, 333166, 358167, 358905, 364825, H03H 2100, H04B 314
Patent
active
043597785
ABSTRACT:
A channel equalizer and ghost cancelling technique are disclosed for removing ghosts from a communications signal which includes a training signal and data. The training signal and its ghosts are processed as a finite length sequence of numbers. The equalizer includes a chain of cascaded filters, the first of which receives the training signal and its ghosts for assuming a filter condition which reduces the finite sequence by two points at the filter's output. Each successive filter in the chain receives the output of an immediately preceding filter and assumes a filter condition in which an additional two points of the finite sequence are eliminated or forced to zero. The filter conditions assumed in response to the training signal and its ghosts are maintained while the data is applied to the filter chain so that ghosts of the type experienced by the training signal are removed from the data.
REFERENCES:
patent: 3314015 (1967-04-01), Simone
patent: 3829798 (1974-08-01), Byram et al.
patent: 4057696 (1977-11-01), Gitlin et al.
patent: 4091418 (1978-05-01), Ciciora
patent: 4127874 (1978-11-01), Iwasawa et al.
"A Novel Automatic Ghost Canceller"--Makino et al.--IEEE Trans. on Consumer Electronics, vol. CE-26, No. 3, Aug. 1980, pp. 629-637.
Bookbinder Marc E.
Zenith Radio Corporation
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