Inventor · disambiguated record
Frederic J. Hirzel
Also filed as: HIRZEL FREDERIC J
11 granted patents·4 pending applications·300 citations·filing 1984–2002
90Inventor score
Top patents by PatentIndex Score
15 records- 0193US4608702AMethod for digital clock recovery from Manchester-encoded signalsADVANCED MICRO DEVICES INC·Filed 1984·Granted Aug 26, 1986·134 cites·3 claims
- 0288US4606052AMethod for detection of line activity for Manchester-encoded signalsADVANCED MICRO DEVICES INC·Filed 1984·Granted Aug 12, 1986·44 cites·5 claims
- 0385US5086454ADirect connect modem deriving power from telephone lineVOCAL TECHNOLOGIES LTD·Filed 1989·Granted Feb 4, 1992·91 cites·2 claims
- 0445US2003128750A1Echo cancellation and transmit spectrum shaping in digital PCM modemsFiled 2002·Application pending·0 cites
- 0537US6327301B1Detection and adaptation to digital network impairments by PCM modemsVOCAL TECHNOLOGIES LTD·Filed 1998·Granted Dec 4, 2001·11 cites·4 claims
- 0635US6848073B2Trellis encoding technique for PCM modemsVOCAL TECHNOLOGIES LTD·Filed 2001·Granted Jan 25, 2005·0 cites·14 claims
- 0733US6480549B1Method for determining attenuation in a digital PCM channelVOCAL TECHNOLOGIES LTD·Filed 1998·Granted Nov 12, 2002·11 cites·3 claims
- 0832US6643270B1Method of compensating for systemic impairments in a telecommunications networkVOCAL TECHNOLOGIES LTD·Filed 1998·Granted Nov 4, 2003·5 cites·15 claims
- 0932US2002131524A1System and method using multi-dimensional constellations with low receiver soft- decision extraction requirementsFiled 2001·Application pending·0 cites
- 1032US2002034269A1Use of soft-decision or sum-product inner coders to improve the performance of outer codersFiled 2001·Application pending·0 cites
- 1131US2002051501A1Use of turbo-like codes for QAM modulation using independent I and Q decoding techniques and applications to xDSL systemsFiled 2001·Application pending·0 cites
- 1230US6222890B1Variable spectral shaping method for PCM modemsVOCAL TECHNOLOGIES LTD·Filed 1998·Granted Apr 24, 2001·2 cites·5 claims
- 1329US6633604B1Method of improving echo canceller training in modems and of discovering characteristics of a PCM channelVOCAL TECHNOLOGIES LTD·Filed 1998·Granted Oct 14, 2003·2 cites·20 claims
- 1428US6301683B1Trellis encoding technique for PCM modemsVOCAL TECHNOLOGIES LTD·Filed 1998·Granted Oct 9, 2001·0 cites·2 claims
- 1522US6067034AMaximal bit packing methodVOCAL TECHNOLOGIES LTD·Filed 1998·Granted May 23, 2000·0 cites·1 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →