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Patent US4612414A successfully refreshed from Google Patents.
US4612414A
Expired / Lapsed
US
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Secure voice transmission
Assignee: AMERICAN BELL Inc A CORP OF
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Filing: 1983-08-31
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Granted: 1986-09-16
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Expires: 2003-08-31
Abstract
Abstract Voice signals are transmitted over a voiceband telephone channel with a high degree of security and good voice quality by applying to the transmission channel a first signal which includes digital information derived from the vocal tract response of the signal and a second signal which includes continuous information derived from the excitation component of the voice signal.
Inventors
- 👤 Biing-Hwang Juang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:13
CPC Classifications
H; H04; H04K; H04K1/00
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
62 words
Apparatus comprising first means for applying to a transmission channel a first signal which includes information indicative of the vocal tract response of a voice signal, and second means for applying to said transmission channel a second signal which includes information indicative of the excitation component of said voice signal, said excitation information being represented in said second signal in continuous form.
Claim 2
Dependent Claim
62 words
Apparatus comprising first means for applying to a transmission channel a first signal which includes information indicative of the vocal tract response of a voice signal, and second means for applying to said transmission channel a second signal which includes information indicative of the excitation component of said voice signal, said excitation information being represented in said second signal in continuous form.
Claim 3
Dependent Claim
23 words
The invention of claim 1 wherein said first and second means jointly include means for frequency division multiplexing said first and second signals.
Claim 4
Dependent Claim
13 words
The invention of claim 1 wherein said vocal tract response information is encrypted.
Claim 5
Dependent Claim
63 words
Apparatus comprising first means for applying to a transmission channel a first signal which includes information indicative of the vocal tract response of a voice signal, and second means for applying to said transmission channel a second signal which includes scrambled information indicative of the excitation component of said voice signal, said excitation information being represented in said second signal in continuous form.
Claim 6
Dependent Claim
63 words
Apparatus comprising first means for applying to a transmission channel a first signal which includes information indicative of the vocal tract response of a voice signal, and second means for applying to said transmission channel a second signal which includes scrambled information indicative of the excitation component of said voice signal, said excitation information being represented in said second signal in continuous form.
Claim 7
Dependent Claim
23 words
The invention of claim 4 wherein said first and second means jointly include means for frequency division multiplexing said first and second signals.
Claim 8
Dependent Claim
13 words
The invention of claim 4 wherein said vocal tract response information is encrypted.
Claim 9
Dependent Claim
80 words
Apparatus comprising first means for applying to a transmission channel a first signal which includes information indicative of the vocal tract response of a voice signal, and second means for applying to said transmission channel a second signal which includes information indicative of the excitation component of said voice signal and filtered in accordance with a filter characteristic which is a function of said vocal tract response information, said excitation information being represented in said second signal in continuous form.
Claim 10
Dependent Claim
80 words
Apparatus comprising first means for applying to a transmission channel a first signal which includes information indicative of the vocal tract response of a voice signal, and second means for applying to said transmission channel a second signal which includes information indicative of the excitation component of said voice signal and filtered in accordance with a filter characteristic which is a function of said vocal tract response information, said excitation information being represented in said second signal in continuous form.
Claim 11
Dependent Claim
23 words
The invention of claim 7 wherein said first and second means jointly include means for frequency division multiplexing said first and second signals.
Claim 12
Dependent Claim
13 words
The invention of claim 7 wherein said vocal tract response information is encrypted.
Claim 13
Dependent Claim
81 words
Apparatus comprising first means for applying to a transmission channel a first signal which includes information indicative of the vocal tract response of a voice signal, and second means for applying to said transmission channel a seocnd signal which includes scrambled information indicative of the excitation component of said voice signal and filtered in accordance with a filter characteristic which is a function of said vocal tract response information, said excitation information being represented in said second signal in continuous form.
Claim 14
Dependent Claim
81 words
Apparatus comprising first means for applying to a transmission channel a first signal which includes information indicative of the vocal tract response of a voice signal, and second means for applying to said transmission channel a seocnd signal which includes scrambled information indicative of the excitation component of said voice signal and filtered in accordance with a filter characteristic which is a function of said vocal tract response information, said excitation information being represented in said second signal in continuous form.
Claim 15
Dependent Claim
23 words
The invention of claim 10 wherein said first and second means jointly include means for frequency division multiplexing said first and second signals.
Claim 16
Dependent Claim
13 words
The invention of claim 11 wherein said vocal tract response information is encrypted.
Claim 17
Dependent Claim
96 words
Apparatus for processing successive frames of speech information, said apparatus comprising means for identifying for each one of said speech frames which one of a plurality of predetermined speech segments said one speech frame is most similar to and for providing an index associated with said one segment, means for generating a frame of information indicative of the excitation components of said one speech frame, and means for applying to a transmission channel a first signal indicative of said index and a second signal in which said frame of excitation information is represented in continuous form.
Claim 18
Dependent Claim
96 words
Apparatus for processing successive frames of speech information, said apparatus comprising means for identifying for each one of said speech frames which one of a plurality of predetermined speech segments said one speech frame is most similar to and for providing an index associated with said one segment, means for generating a frame of information indicative of the excitation components of said one speech frame, and means for applying to a transmission channel a first signal indicative of said index and a second signal in which said frame of excitation information is represented in continuous form.
Claim 19
Dependent Claim
22 words
The invention of claim 13 wherein said generating means includes means for scrambling said excitation component to form a scrambled excitation component.
Claim 20
Dependent Claim
26 words
The invention of claim 14 wherein said generating means further includes means for filtering said scrambled excitation component with a filter characteristic associated with said index.
Claim 21
Independent Claim
60 words
A method comprising the steps of applying to a transmission channel a first signal which includes information indicative of the vocal tract response of a voice signal, and applying to said transmission channel a second signal which includes information indicative of the excitation component of said voice signal, said excitation information being represented in said second signal in continuous form.
Claim 22
Independent Claim
60 words
A method comprising the steps of applying to a transmission channel a first signal which includes information indicative of the vocal tract response of a voice signal, and applying to said transmission channel a second signal which includes information indicative of the excitation component of said voice signal, said excitation information being represented in said second signal in continuous form.
Claim 23
Dependent Claim
22 words
The invention of claim 16 wherein said applying steps jointly include the step of frequency division multiplexing said first and second signals.
Claim 24
Dependent Claim
13 words
The invention of claim 16 wherein said vocal tract response information is encrypted.
Claim 25
Independent Claim
61 words
A method comprising the steps of applying to a transmission channel a first signal which includes information indicative of the vocal tract response of a voice signal, and applying to said transmission channel a second signal which includes scrambled information indicative of the excitation component of said voice signal, said excitation information being represented in said second signal in continuous form.
Claim 26
Independent Claim
61 words
A method comprising the steps of applying to a transmission channel a first signal which includes information indicative of the vocal tract response of a voice signal, and applying to said transmission channel a second signal which includes scrambled information indicative of the excitation component of said voice signal, said excitation information being represented in said second signal in continuous form.
Claim 27
Dependent Claim
22 words
The invention of claim 19 wherein said applying steps jointly include the step of frequency division multiplexing said first and second signals.
Claim 28
Dependent Claim
13 words
The invention of claim 19 wherein said vocal tract response information is encrypted.
Claim 29
Independent Claim
78 words
A method comprising the steps of applying to a transmission channel a first signal which includes information indicative of the vocal tract response of a voice signal, and applying to said transmission channel a second signal which includes information indicative of the excitation component of said voice signal and filtered in accordance with a filter characteristic which is a function of said vocal tract response information, said excitation information being represented in said second signal in continuous form.
Claim 30
Independent Claim
78 words
A method comprising the steps of applying to a transmission channel a first signal which includes information indicative of the vocal tract response of a voice signal, and applying to said transmission channel a second signal which includes information indicative of the excitation component of said voice signal and filtered in accordance with a filter characteristic which is a function of said vocal tract response information, said excitation information being represented in said second signal in continuous form.
Claim 31
Dependent Claim
22 words
The invention of claim 22 wherein said applying steps jointly include the step of frequency division multiplexing said first and second signals.
Claim 32
Dependent Claim
13 words
The invention of claim 22 wherein said vocal tract response information is encrypted.
Claim 33
Independent Claim
79 words
A method comprising the steps of applying to a transmission channel a first signal which includes information indicative of the vocal tract response of a voice signal, and applying to said transmission channel a second signal which includes scrambled information indicative of the excitation component of said voice signal and filtered in accordance with a filter characteristic which is a function of said vocal tract response information, said excitation information being represented in said second signal in continuous form.
Claim 34
Independent Claim
79 words
A method comprising the steps of applying to a transmission channel a first signal which includes information indicative of the vocal tract response of a voice signal, and applying to said transmission channel a second signal which includes scrambled information indicative of the excitation component of said voice signal and filtered in accordance with a filter characteristic which is a function of said vocal tract response information, said excitation information being represented in said second signal in continuous form.
Claim 35
Dependent Claim
22 words
The invention of claim 25 wherein said applying steps jointly include the step of frequency division multiplexing said first and second signals.
Claim 36
Dependent Claim
13 words
The invention of claim 25 wherein said vocal tract response information is encrypted.
Claim 37
Independent Claim
92 words
A method for processing successive frames of speech information, said method comprising the steps of identifying for each one of said speech frames which one of a plurality of predetermined speech segments said one speech frame is most similar to, providing an index associated with said one segment, generating a frame of information indicative of the excitation component of said one speech frame, and applying to a transmission channel a first signal indicative of said index and a second signal in which said frame of excitation information is represented in continuous form.
Claim 38
Independent Claim
92 words
A method for processing successive frames of speech information, said method comprising the steps of identifying for each one of said speech frames which one of a plurality of predetermined speech segments said one speech frame is most similar to, providing an index associated with said one segment, generating a frame of information indicative of the excitation component of said one speech frame, and applying to a transmission channel a first signal indicative of said index and a second signal in which said frame of excitation information is represented in continuous form.
Claim 39
Dependent Claim
23 words
The invention of claim 28 wherein said generating step includes the step of scrambling said excitation component to form a scrambled excitation component.
Claim 40
Dependent Claim
27 words
The invention of claim 29 wherein said generating step includes the further step of filtering said scrambled excitation component with a filter characteristic associated with said index.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-15 | 1990-03-17 | 1990-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-15 | 1994-03-17 | 1994-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-15 | 1998-03-17 | 1998-09-16 | $7700.00 | Window Closed / Lapsed |