US3819875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aids for deaf persons
Assignee: National Research Development Corp UK
•
Filing: 1972-06-05
•
Granted: 1974-06-25
•
Expires: 1992-06-05
Abstract
Abstract An aid for a deaf person, comprising means for changing electrical signals having a first range of electrical frequencies corresponding to a first range of audio frequency signals used in normal speech into electrical signals having a second range of electrical frequencies different from said first range of electrical frequencies in such a manner that the frequency differences of said first range of electrical frequencies are substantially maintained in said second range of electrical frequencies and for superimposing the changed electrical signals onto electrical signals having frequencies within said second range of electrical frequencies and which correspond to a second range of audio frequency signals used in normal speech.
Inventors
- 👤 M Velmans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:29
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/35; H04R25/353
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
108 words
An aid for a deaf person, comprising means for changing electrical signals having a first range of electrical frequencies corresponding to a first range of audio frequency signals used in normal speech into electrical signals having a second range of electrical frequencies different from said first range of electrical frequencies without compression so that the frequency differences within said first range of electrical frequencies are substantially maintained in said second range of electrical frequencies and for superimposing the changed electrical signals onto electrical signals having frequencies within said second range of electrical frequencies and which correspond to a second range of audio frequency signals used in normal speech.
Claim 2
Dependent Claim
108 words
An aid for a deaf person, comprising means for changing electrical signals having a first range of electrical frequencies corresponding to a first range of audio frequency signals used in normal speech into electrical signals having a second range of electrical frequencies different from said first range of electrical frequencies without compression so that the frequency differences within said first range of electrical frequencies are substantially maintained in said second range of electrical frequencies and for superimposing the changed electrical signals onto electrical signals having frequencies within said second range of electrical frequencies and which correspond to a second range of audio frequency signals used in normal speech.
Claim 3
Dependent Claim
41 words
An aid according to claim 1, wherein electrical signals corresponding to signals in an upper part of the audio frequency range are changed and superimposed upon electrical signals corresponding to audio signals in a lower part of the audio frequency range.
Claim 4
Dependent Claim
76 words
An aid according to claim 2, wherein electrical signals having frequencies of from 4,000 cps. and above and corresponding to signals in an upper part of the audio frequency range are changed so as to have frequencies of from 100 cps. and above and wherein the changed electrical signals are superimposed upon electrical signals having frequencies of from 100 cps. and above and corresponding to audio signals in a lower part of the audio frequency range.
Claim 5
Dependent Claim
47 words
An aid according to claim 1 wherein the changing means comprises frequency modulating means for modulating an input signal, a single side band filter for filtering the output signal from the modulating means, and demodulating means for demodulating the output signal from the single side band filter.
Claim 6
Dependent Claim
97 words
An aid according to claim 1, comprising a first circuit path and a second circuit path, the first circuit path providing said changing means and comprising frequency modulating means for modulating an input signal, a single side band filter for filtering the output signal from the modulating means and demodulating means for demodulating the output signal from the single side band filter and the second circuit path comprising amplifier means for amplifying an input signal, and means whereby the output signal from the first circuit path can be superimposed on the signal within the second circuit path.
Claim 7
Dependent Claim
16 words
An aid according to claim 5, wherein said amplifier means comprises a pre-amplifier and an amplifier.
Claim 8
Dependent Claim
25 words
An aid according to claim 5, wherein means is associated with said second circuit path for providing a choice of outputs within desired frequency ranges.
Claim 9
Dependent Claim
52 words
An aid according to claim 5, wherein there is associated with the second circuit path a plurality of filters having outputs within different frequency ranges and switch means whereby any one of said filters can be selectively connected with said second circuit path to provide an output within a desired frequency range.
Claim 10
Independent Claim
124 words
A method of recoding audio frequencies used in normal speech as an aid to the deaf, the method comprising translating the audio frequencies used in normal speech into electrical signals, changinG those electrical signals having a first range of electrical frequencies corresponding to a first range of said audio frequencies into electrical signals having a second range of electrical frequencies different from said first range of electrical frequencies without compression so that the frequency differences within said first range of electrical frequencies are maintained in said second range of electrical frequencies and superimposing the changed electrical signals onto electrical signals having frequencies within said second range of electrical frequencies and which correspond to a second range of audio frequency signals used in normal speech.
Claim 11
Independent Claim
124 words
A method of recoding audio frequencies used in normal speech as an aid to the deaf, the method comprising translating the audio frequencies used in normal speech into electrical signals, changinG those electrical signals having a first range of electrical frequencies corresponding to a first range of said audio frequencies into electrical signals having a second range of electrical frequencies different from said first range of electrical frequencies without compression so that the frequency differences within said first range of electrical frequencies are maintained in said second range of electrical frequencies and superimposing the changed electrical signals onto electrical signals having frequencies within said second range of electrical frequencies and which correspond to a second range of audio frequency signals used in normal speech.
References Cited (Backward Citations)
US3385937A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |