Inventor · disambiguated record
John C. Hardwick
Also filed as: HARDWICK JOHN C
37 granted patents·2 pending applications·2,391 citations·filing 1989–2024
98Inventor score
Top patents by PatentIndex Score
39 records- 0196US5491772AMethods for speech transmissionDIGITAL VOICE SYSTEMS INC·Filed 1995·Granted Feb 13, 1996·271 cites·4 claims
- 0296US5216747AVoiced/unvoiced estimation of an acoustic signalDIGITAL VOICE SYSTEMS INC·Filed 1991·Granted Jun 1, 1993·309 cites·10 claims
- 0395US6675148B2Lossless audio coderDIGITAL VOICE SYSTEMS INC·Filed 2001·Granted Jan 6, 2004·161 cites·60 claims
- 0493US8131389B1Digital audio serverHARDWICK JOHN C·Filed 2002·Granted Mar 6, 2012·156 cites·30 claims
- 0591US11715477B1Speech model parameter estimation and quantizationDIGITAL VOICE SYSTEMS INC·Filed 2022·Granted Aug 1, 2023·2 cites·30 claims
- 0688US12462814B2Bit error correction in digital speechDIGITAL VOICE SYSTEMS INC·Filed 2023·Granted Nov 4, 2025·1 cites·15 claims
- 0785US6131084ADual subframe quantization of spectral magnitudesDIGITAL VOICE SYSTEMS INC·Filed 1997·Granted Oct 10, 2000·130 cites·34 claims
- 0884US5226108AProcessing a speech signal with estimated pitchDIGITAL VOICE SYSTEMS INC·Filed 1990·Granted Jul 6, 1993·87 cites·40 claims
- 0983US9990928B2Audio watermarking via phase modificationDIGITAL VOICE SYSTEMS INC·Filed 2015·Granted Jun 5, 2018·5 cites·14 claims
- 1083US5701390ASynthesis of MBE-based coded speech using regenerated phase informationDIGITAL VOICE SYSTEMS INC·Filed 1995·Granted Dec 23, 1997·116 cites·10 claims
- 1183US5630011AQuantization of harmonic amplitudes representing speechDIGITAL VOICE SYSTEMS INC·Filed 1994·Granted May 13, 1997·102 cites·17 claims
- 1283US5247579AMethods for speech transmissionDIGITAL VOICE SYSTEMS INC·Filed 1991·Granted Sep 21, 1993·91 cites·18 claims
- 1382US6377916B1Multiband harmonic transform coderDIGITAL VOICE SYSTEMS INC·Filed 1999·Granted Apr 23, 2002·103 cites·42 claims
- 1482US5195166AMethods for generating the voiced portion of speech signalsDIGITAL VOICE SYSTEMS INC·Filed 1991·Granted Mar 16, 1993·77 cites·9 claims
- 1580US11990144B2Reducing perceived effects of non-voice data in digital speechDIGITAL VOICE SYSTEMS INC·Filed 2021·Granted May 21, 2024·1 cites·15 claims
- 1680US6912495B2Speech model and analysis, synthesis, and quantization methodsDIGITAL VOICE SYSTEMS INC·Filed 2001·Granted Jun 28, 2005·32 cites·45 claims
- 1780US5754974ASpectral magnitude representation for multi-band excitation speech codersDIGITAL VOICE SYSTEMS INC·Filed 1995·Granted May 19, 1998·101 cites·19 claims
- 1880US5517511ADigital transmission of acoustic signals over a noisy communication channelDIGITAL VOICE SYSTEMS INC·Filed 1992·Granted May 14, 1996·77 cites·20 claims
- 1978US5870405ADigital transmission of acoustic signals over a noisy communication channelDIGITAL VOICE SYSTEMS INC·Filed 1996·Granted Feb 9, 1999·91 cites·14 claims
- 2078US5081681AMethod and apparatus for phase synthesis for speech processingDIGITAL VOICE SYSTEMS INC·Filed 1989·Granted Jan 14, 1992·60 cites·22 claims
- 2177US8200497B2Synthesizing/decoding speech samples corresponding to a voicing stateHARDWICK JOHN C·Filed 2009·Granted Jun 12, 2012·9 cites·85 claims
- 2276US7957963B2Voice transcoderDIGITAL VOICE SYSTEMS INC·Filed 2009·Granted Jun 7, 2011·7 cites·22 claims
- 2374US5664051AMethod and apparatus for phase synthesis for speech processingDIGITAL VOICE SYSTEMS INC·Filed 1994·Granted Sep 2, 1997·65 cites·12 claims
- 2474US5226084AMethods for speech quantization and error correctionDIGITAL VOICE SYSTEMS INC·Filed 1990·Granted Jul 6, 1993·70 cites·25 claims
- 2573US6199037B1Joint quantization of speech subframe voicing metrics and fundamental frequenciesDIGITAL VOICE SYSTEMS INC·Filed 1997·Granted Mar 6, 2001·70 cites·30 claims
- 2673US6161089AMulti-subframe quantization of spectral parametersDIGITAL VOICE SYSTEMS INC·Filed 1997·Granted Dec 12, 2000·69 cites·54 claims
- 2772US2024304197A1Reducing Perceived Effects of Non-Voice Data in Digital SpeechDIGITAL VOICE SYSTEMS INC·Filed 2024·Application pending·0 cites
- 2870US8595002B2Half-rate vocoderDIGITAL VOICE SYSTEMS INC·Filed 2013·Granted Nov 26, 2013·3 cites·80 claims
- 2970US5581656AMethods for generating the voiced portion of speech signalsDIGITAL VOICE SYSTEMS INC·Filed 1993·Granted Dec 3, 1996·42 cites·19 claims
- 3069US8315860B2Interoperable vocoderHARDWICK JOHN C·Filed 2011·Granted Nov 20, 2012·3 cites·35 claims
- 3168US5649050AApparatus and method for maintaining data rate integrity of a signal despite mismatch of readiness between sequential transmission line componentsDIGITAL VOICE SYSTEMS INC·Filed 1993·Granted Jul 15, 1997·50 cites·25 claims
- 3267US10210875B2Audio watermarking via phase modificationDIGITAL VOICE SYSTEMS INC·Filed 2018·Granted Feb 19, 2019·1 cites·8 claims
- 3367US7634399B2Voice transcoderDIGITAL VOICE SYSTEMS INC·Filed 2003·Granted Dec 15, 2009·12 cites·54 claims
- 3465US7970606B2Interoperable vocoderDIGITAL VOICE SYSTEMS INC·Filed 2002·Granted Jun 28, 2011·10 cites·58 claims
- 3558US8359197B2Half-rate vocoderDIGITAL VOICE SYSTEMS INC·Filed 2003·Granted Jan 22, 2013·5 cites·87 claims
- 3657US12254895B2Detecting and compensating for the presence of a speaker mask in a speech signalDIGITAL VOICE SYSTEMS INC·Filed 2021·Granted Mar 18, 2025·0 cites·23 claims
- 3756US12451151B2Tone frame detector for digital speechDIGITAL VOICE SYSTEMS INC·Filed 2022·Granted Oct 21, 2025·0 cites·26 claims
- 3855US8265937B2Breathing apparatus speech enhancement using reference sensorGRIFFIN DANIEL W·Filed 2008·Granted Sep 11, 2012·2 cites·17 claims
- 3945US2003135374A1Speech synthesizerFiled 2002·Application pending·0 cites
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →