MP3 "essential" patents
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Expiration dates can be tricky due to continuations etc. No guarantee this is correct!
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This covers the scenario of making a basic, fairly low quality stereo encoder.
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CoversWorkaroundProblem
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HolderPatent Nr.Earliest FileExpiration Date
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Thomson59240601987-08-292007-08-29FALSE
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Thomson48212601987-12-162007-12-16FALSE
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Thomson49426071988-02-032008-02-03FALSE
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Thomson52147421990-01-262010-05-25FALSE
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Thomson52279901990-05-172010-07-13FALSE
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Sisvel52146781990-05-312011-06-01FALSE
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Sisvel53233961990-06-012011-06-01FALSE
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Sisvel57779921990-06-012011-06-01FALSE
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Thomson53217291991-06-242011-06-24Short/long block switching detectionYes, for encoderFALSE
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Alcatel - Lucent53414571988-12-302011-08-23Psymodel/quantization with tonalityYesFALSE
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Thomson53848111990-10-082012-01-24MDCT TDAC maybe with block switch (???)FALSE
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Thomson54558331990-10-252012-10-03Detecting corruptionYesFALSE
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Thomson55598341992-10-062013-09-24Antialiasing butterfliesNoFALSE
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Thomson55794301991-12-202013-11-26Huffman group coding + Escape valuesYes, for encoderFALSE
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Alcatel - Lucent5627938/RE390801988-12-302014-05-06Rate loop, masking on psy + ATHYesFALSE
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Thomson57039991993-05-182014-12-30Most useful Joint Stereo switching decisionsYesFALSE
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Thomson57063091993-11-022015-01-06Multichannel reconstructionYesFALSE
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Thomson57013461995-02-022015-02-02Multichannel (>2) compatibilityYesFALSE
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Thomson57369431994-07-082015-04-07M/S and IS decision in the frequency domainYesFALSE
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Thomson57427351989-04-202015-04-21Specific (fast/bad) bit allocation for overshootYesFALSE
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Thomson58126721992-10-132015-09-22Joint Stereo switchingYesFALSE
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Thomson61855391997-02-192017-02-19Set region where scf=1.0, not coding hfYesFALSE
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Thomson60093991997-04-162017-04-16Mixing 2 psymodels for rate controlYesFALSE
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http://creativecommons.org/licenses/by-sa/3.0/us/
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