Assignee
PICTURETEL CORP
US·41 granted patents·4,834 citations·filing 1985–2000
Top patents by PatentIndex Score
41 records- 0197US5778082AMethod and apparatus for localization of an acoustic sourcePICTURETEL CORP·Filed 1996·Granted Jul 7, 1998·250 cites·37 claims
- 0296US5550924AReduction of background noise for speech enhancementPICTURETEL CORP·Filed 1995·Granted Aug 27, 1996·305 cites·21 claims
- 0396US5305307AAdaptive acoustic echo canceller having means for reducing or eliminating echo in a plurality of signal bandwidthsPICTURETEL CORP·Filed 1991·Granted Apr 19, 1994·224 cites·40 claims
- 0496US4754492AMethod and system for adapting a digitized signal processing system for block processing with minimal blocking artifactsPICTURETEL CORP·Filed 1985·Granted Jun 28, 1988·162 cites·102 claims
- 0595US5821986AMethod and apparatus for visual communications in a scalable network environmentPICTURETEL CORP·Filed 1994·Granted Oct 13, 1998·238 cites·64 claims
- 0695US5767897AVideo conferencing systemPICTURETEL CORP·Filed 1994·Granted Jun 16, 1998·577 cites·67 claims
- 0795US5715319AMethod and apparatus for steerable and endfire superdirective microphone arrays with reduced analog-to-digital converter and computational requirementsPICTURETEL CORP·Filed 1996·Granted Feb 3, 1998·199 cites·25 claims
- 0894US6911987B1Method and system for transmitting data for a shared applicationPICTURETEL CORP·Filed 2000·Granted Jun 28, 2005·91 cites·8 claims
- 0994US5486853AElectrical cable interface for electronic cameraPICTURETEL CORP·Filed 1994·Granted Jan 23, 1996·218 cites·33 claims
- 1094US5283646AQuantizer control method and apparatusPICTURETEL CORP·Filed 1992·Granted Feb 1, 1994·299 cites·14 claims
- 1194US5263019AMethod and apparatus for estimating the level of acoustic feedback between a loudspeaker and microphonePICTURETEL CORP·Filed 1992·Granted Nov 16, 1993·153 cites·18 claims
- 1293US5150209AHierarchical entropy coded lattice threshold quantization encoding method and apparatus for image and video compressionPICTURETEL CORP·Filed 1991·Granted Sep 22, 1992·180 cites·58 claims
- 1392US5787183AMicrophone system for teleconferencing systemPICTURETEL CORP·Filed 1996·Granted Jul 28, 1998·127 cites·8 claims
- 1492US5374971ATwo-view video camera stand and support methodPICTURETEL CORP·Filed 1993·Granted Dec 20, 1994·99 cites·11 claims
- 1591US5367385AMethod and apparatus for processing block coded image data to reduce boundary artifacts between adjacent image blocksPICTURETEL CORP·Filed 1992·Granted Nov 22, 1994·157 cites·7 claims
- 1691US5155594AHierarchical encoding method and apparatus employing background references for efficiently communicating image sequencesPICTURETEL CORP·Filed 1991·Granted Oct 13, 1992·139 cites·22 claims
- 1790US4727422AMethod and apparatus for efficiently communicating image sequence having improved motion compensationPICTURETEL CORP·Filed 1985·Granted Feb 23, 1988·72 cites·16 claims
- 1889US5983192AAudio processorPICTURETEL CORP·Filed 1999·Granted Nov 9, 1999·117 cites·4 claims
- 1989US4849810AHierarchial encoding method and apparatus for efficiently communicating image sequencesPICTURETEL CORP·Filed 1987·Granted Jul 18, 1989·105 cites·67 claims
- 2088US4703350AMethod and apparatus for efficiently communicating image sequencesPICTURETEL CORP·Filed 1985·Granted Oct 27, 1987·59 cites·28 claims
- 2187US5317672AVariable bit rate speech encoderPICTURETEL CORP·Filed 1992·Granted May 31, 1994·114 cites·22 claims
- 2286USD372918SSpeaker enclosurePICTURETEL CORP·Filed 1995·Granted Aug 20, 1996·37 cites·1 claims
- 2385US6285661B1Low delay real time digital video mixing for multipoint video conferencingPICTURETEL CORP·Filed 1998·Granted Sep 4, 2001·87 cites·38 claims
- 2483US5664021AMicrophone system for teleconferencing systemPICTURETEL CORP·Filed 1993·Granted Sep 2, 1997·70 cites·19 claims
- 2578US6357028B1Error correction and concealment during data transmissionPICTURETEL CORP·Filed 1999·Granted Mar 12, 2002·104 cites·45 claims
- 2678US5924064AVariable length coding using a plurality of region bit allocation patternsPICTURETEL CORP·Filed 1996·Granted Jul 13, 1999·67 cites·16 claims
- 2777US5805739ALapped orthogonal vector quantizationPICTURETEL CORP·Filed 1996·Granted Sep 8, 1998·62 cites·10 claims
- 2876USD368478SVideoconferencing keypadPICTURETEL CORP·Filed 1995·Granted Apr 2, 1996·21 cites·1 claims
- 2975US6141597AAudio processorPICTURETEL CORP·Filed 1997·Granted Oct 31, 2000·76 cites·10 claims
- 3075US5987131ACryptographic key exchange using pre-computationPICTURETEL CORP·Filed 1997·Granted Nov 16, 1999·96 cites·22 claims
- 3175USD374023SRemotely controlled cameraPICTURETEL CORP·Filed 1995·Granted Sep 24, 1996·20 cites·1 claims
- 3274US5633681AElectrically controlled camera positioning systemPICTURETEL CORP·Filed 1995·Granted May 27, 1997·52 cites·20 claims
- 3372USD446531SVideo cameraPICTURETEL CORP·Filed 1999·Granted Aug 14, 2001·17 cites·1 claims
- 3471US4703349AMethod and apparatus for multi-dimensional signal processing using a Short-Space Fourier transformPICTURETEL CORP·Filed 1985·Granted Oct 27, 1987·24 cites·40 claims
- 3563US6240140B1Channel aggregation having low latency and overheadPICTURETEL CORP·Filed 1998·Granted May 29, 2001·53 cites·33 claims
- 3662US5664057AFixed bit rate speech encoder/decoderPICTURETEL CORP·Filed 1995·Granted Sep 2, 1997·57 cites·5 claims
- 3758US5943248Aw-bit non-linear combiner for pseudo-random number generationPICTURETEL CORP·Filed 1997·Granted Aug 24, 1999·42 cites·36 claims
- 3856US5983252APseudo-random number generator capable of efficiently exploiting processors having instruction-level parallelism and the use thereof for encryptionPICTURETEL CORP·Filed 1998·Granted Nov 9, 1999·32 cites·86 claims
- 3956USD394255SIntegral videoconferencing systemPICTURETEL CORP·Filed 1996·Granted May 12, 1998·14 cites·1 claims
- 4054US5644660AMethod and apparatus for efficiently transmitting forced updates in a moving picture codecPICTURETEL CORP·Filed 1992·Granted Jul 1, 1997·16 cites·15 claims
- 4131USD389839SDirectional microphonePICTURETEL CORP·Filed 1997·Granted Jan 27, 1998·2 cites·1 claims
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