|
| US3975587 | 13 Sep 1974 | 17 Aug 1976 | International Telephone and Telegraph Corporation | Digital vocoder |
| US3979557 | 3 Jul 1975 | 7 Sep 1976 | International Telephone and Telegraph Corporation | Speech processor system for pitch period extraction using prediction filters |
| US4022974 | 3 Jun 1976 | 10 May 1977 | Bell Telephone Laboratories, Incorporated | Adaptive linear prediction speech synthesizer |
| US4038495 | 14 Nov 1975 | 26 Jul 1977 | Rockwell International Corporation | Speech analyzer/synthesizer using recursive filters |
| US4045616 | 23 May 1975 | 30 Aug 1977 | Time Data Corporation | Vocoder system |
| US4052563 | 7 Oct 1975 | 4 Oct 1977 | Nippon Telegraph and Telephone Public Corporation | Multiplex speech transmission system with speech analysis-synthesis |
| US4058676 | 7 Jul 1975 | 15 Nov 1977 | International Communication Sciences | Speech analysis and synthesis system |
| US4087632 | 26 Nov 1976 | 2 May 1978 | Bell Telephone Laboratories, Incorporated | Speech recognition system |
| US4335275 | 4 Feb 1980 | 15 Jun 1982 | Texas Instruments Incorporated | Synchronous method and apparatus for speech synthesis circuit |
| US4472832 | 1 Dec 1981 | 18 Sep 1984 | AT&T Bell Laboratories | Digital speech coder |
| US4633499 | 8 Oct 1982 | 30 Dec 1986 | Sharp Kabushiki Kaisha | Speech recognition system |
| US4667340 | 13 Apr 1983 | 19 May 1987 | Texas Instruments Incorporated | Voice messaging system with pitch-congruent baseband coding |
| US4701954 | 16 Mar 1984 | 20 Oct 1987 | American Telephone and Telegraph Company, AT&T Bell Laboratories | Multipulse LPC speech processing arrangement |
| US4709390 | 4 May 1984 | 24 Nov 1987 | American Telephone and Telegraph Company, AT&T Bell Laboratories | Speech message code modifying arrangement |
| US4710959 | 19 Dec 1983 | 1 Dec 1987 | Massachusetts Institute of Technology | Voice encoder and synthesizer |
| US4764963 | 12 Jan 1987 | 16 Aug 1988 | American Telephone and Telegraph Company, AT&T Bell Laboratories | Speech pattern compression arrangement utilizing speech event identification |
| US4827517 | 26 Dec 1985 | 2 May 1989 | American Telephone and Telegraph Company, AT&T Bell Laboratories | Digital speech processor using arbitrary excitation coding |
| US4847906 | 28 Mar 1986 | 11 Jul 1989 | American Telephone and Telegraph Company, AT&T Bell Laboratories | Linear predictive speech coding arrangement |
| US4866415 | 19 Jan 1988 | 12 Sep 1989 | Kabushiki Kaisha Toshiba | Tone signal generating system for use in communication apparatus |
| US4890328 | 28 Aug 1985 | 26 Dec 1989 | American Telephone and Telegraph Company
AT&T Bell Laboratories | Voice synthesis utilizing multi-level filter excitation |
| US4913539 | 4 Apr 1988 | 3 Apr 1990 | New York Institute of Technology | Apparatus and method for lip-synching animation |
| US4975955 | 13 Oct 1989 | 4 Dec 1990 | NEC Corporation | Pattern matching vocoder using LSP parameters |
| US5048088 | 28 Mar 1989 | 10 Sep 1991 | NEC Corporation | Linear predictive speech analysis-synthesis apparatus |
| US5233659 | 3 Jan 1992 | 3 Aug 1993 | Telefonaktiebolaget L M Ericsson | Method of quantizing line spectral frequencies when calculating filter parameters in a speech coder |
| US5377301 | 21 Jan 1994 | 27 Dec 1994 | AT&T Corp. | Technique for modifying reference vector quantized speech feature signals |
| US5450449 | 14 Mar 1994 | 12 Sep 1995 | AT&T IPM Corp. | Linear prediction coefficient generation during frame erasure or packet loss |
| US5471527 | 2 Dec 1993 | 28 Nov 1995 | DSC Communications Corporation | Voice enhancement system and method |
| US5704003 | 19 Sep 1995 | 30 Dec 1997 | Lucent Technologies Inc. | RCELP coder |
| US5822724 | 14 Jun 1995 | 13 Oct 1998 | | Optimized pulse location in codebook searching techniques for speech processing |
| US5839098 | 19 Dec 1996 | 17 Nov 1998 | Lucent Technologies Inc. | Speech coder methods and systems |
| US5884253 | 3 Oct 1997 | 16 Mar 1999 | Lucent Technologies, Inc. | Prototype waveform speech coding with interpolation of pitch, pitch-period waveforms, and synthesis filter |
| US5937376 | 10 Oct 1997 | 10 Aug 1999 | Telefonaktiebolaget LM Ericsson | Method of coding an excitation pulse parameter sequence |
| US6003000 | 29 Apr 1997 | 14 Dec 1999 | Meta-C Corporation | Method and system for speech processing with greatly reduced harmonic and intermodulation distortion |
| US6064956 | 5 Jan 1998 | 16 May 2000 | Telefonaktiebolaget LM Ericsson | Method to determine the excitation pulse positions within a speech frame |
| US6081777 | 21 Sep 1998 | 27 Jun 2000 | Lockheed Martin Corporation | Enhancement of speech signals transmitted over a vocoder channel |
| US6091773 | 12 Nov 1997 | 18 Jul 2000 | | Data compression method and apparatus |
| US6233550 | 28 Aug 1998 | 15 May 2001 | The Regents of the University of California | Method and apparatus for hybrid coding of speech at 4kbps |
| US6475245 | 5 Feb 2001 | 5 Nov 2002 | The Regents of the University of California | Method and apparatus for hybrid coding of speech at 4KBPS having phase alignment between mode-switched frames |
| US6708154 | 14 Nov 2002 | 16 Mar 2004 | Microsoft Corporation | Method and apparatus for using formant models in resonance control for speech systems |
| US7206739 | 23 May 2002 | 17 Apr 2007 | Samsung Electronics Co., Ltd. | Excitation codebook search method in a speech coding system |
| USRE32580 | 18 Sep 1986 | 19 Jan 1988 | American Telephone and Telegraph Company, AT&T Bell Laboratories | Digital speech coder |
| USRE34247 | 2 May 1991 | 11 May 1993 | AT&T Bell Laboratories | Digital speech processor using arbitrary excitation coding |
| USRE43099 | 17 Nov 2008 | 10 Jan 2012 | Alcatel Lucent | Speech coder methods and systems |
