US5228076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High fidelity speech encoding for telecommunications systems
Assignee: Individual
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Filing: 1991-02-08
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Granted: 1993-07-13
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Expires: 2011-02-08
Abstract
Abstract A user-orientated telephone instrument including high-fidelity speech encoding, encryption capability and many function presently provided by centralized call processing is described. Utilizing an ADPCM encoding process including forward error correction, a high quality relatively noise immune signal is provided. To the user, the instrument appears as a unique electronic telephone which offers many special services to facilitate communications with other people and with computers. Advanced features such as optional hands-off voice on/off-hook control, personal identification by voice print and remote chart presentation are provided.
Inventors
- 👤 Emil Hopner
- 👤 Stanley M. Head
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:17
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04Q11/0407
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
229 words
A telephone for producing and receiving audible speech sound having no foldover distortion owing to the natural frequency spectrum of vowel sounds and having no lowpass filter, said telephone comprising: a microprocessor; first transducer means for producing, transmitting and receiving signals representing audible speech sound; and signal processing means coupled to the microprocessor and to the transducer means, for converting said audible speech sound to digital signals having a predetermined data rate, said data rate including a preselected sampling rate and a preselected digitizing rate; said preselected sampling rate selected at a rate for no foldover distortion of said vowel sounds and said preselected sampling rate is less than the Nyquist sampling rate of consonant sounds found in said audible speech sound; said signal processing means including volume compression means for compressing said audible speech sound; said preselected digitizing rate selected for use with said volume compression means for reducing quantization noise; said preselected sampling rate and said preselected digitizing rate cooperating to provide high fidelity speech quality; said signal processing means further including error correction means for producing digital signals representing error correction code at a preselected rate and for combining said last-mentioned digital signals with said digital signals representing audible speech sound; said signal processing means further including conversion means for converting digital signals representing said audible speech sound to speech signals representing said audible speech sound.
Claim 2
Dependent Claim
229 words
A telephone for producing and receiving audible speech sound having no foldover distortion owing to the natural frequency spectrum of vowel sounds and having no lowpass filter, said telephone comprising: a microprocessor; first transducer means for producing, transmitting and receiving signals representing audible speech sound; and signal processing means coupled to the microprocessor and to the transducer means, for converting said audible speech sound to digital signals having a predetermined data rate, said data rate including a preselected sampling rate and a preselected digitizing rate; said preselected sampling rate selected at a rate for no foldover distortion of said vowel sounds and said preselected sampling rate is less than the Nyquist sampling rate of consonant sounds found in said audible speech sound; said signal processing means including volume compression means for compressing said audible speech sound; said preselected digitizing rate selected for use with said volume compression means for reducing quantization noise; said preselected sampling rate and said preselected digitizing rate cooperating to provide high fidelity speech quality; said signal processing means further including error correction means for producing digital signals representing error correction code at a preselected rate and for combining said last-mentioned digital signals with said digital signals representing audible speech sound; said signal processing means further including conversion means for converting digital signals representing said audible speech sound to speech signals representing said audible speech sound.
Claim 3
Dependent Claim
17 words
A telephone as in claim 1 wherein said preselected digitizing rate comprise 3 bits of digital data.
Claim 4
Dependent Claim
37 words
A telephone as in claim 1 further including: input means coupled to the microprocessor for entering information; and second transducer means for producing, transmitting and receiving analog signals representing video data for display on said input means.
Claim 5
Dependent Claim
17 words
A telephone as in claim 2 wherein said preselected sampling rate is approximately 10,000 samples per second.
Claim 6
Dependent Claim
21 words
A telephone as in claim 4 wherein said preselected rate for said error correction code is approximately 2,000 bits per second.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-12 | 1997-01-11 | 1997-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-12 | 2001-01-11 | 2001-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-12 | 2005-01-11 | 2005-07-13 | $7700.00 | Window Closed / Lapsed |