US3867715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater communications system
Assignee: United States Department of the Navy
•
Filing: 1973-11-08
•
Granted: 1975-02-18
•
Expires: 1993-11-08
Abstract
Abstract The communication method and system for use in reverberant environments includes a transmission of the real time communication message followed by a transmission of the same message recorded and processed to occupy a longer period of time and to have an inverted time sequence order.
Inventors
- 👤 Fred G Geil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:59
CPC Classifications
H; H04; H04B; H04B11/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
154 words
A method of voice communication in a reverberant environment comprising the steps of: transmitting the voice communication over a normal communication path from a first station to a second station spaced therefrom in said reverberant environment where it is received; simultaneously recording at a first rate the voice communication during the transmitting step at the first station; replaying the recorded voice communication in reverse time sequence and at a slower rate than that at which it was recorded; transmitting the replayed voice communication over the normal communication path between said first and said second stations; rerecording said replayed voice communication at said slower rate of speed at said second station as it is received over said communication path; replaying said rerecorded voice communication at the said first rate and in reverse time sequence than that at which it was rerecorded at said second station; and utilizing said received voice communications to extract information therefrom.
Claim 2
Independent Claim
154 words
A method of voice communication in a reverberant environment comprising the steps of: transmitting the voice communication over a normal communication path from a first station to a second station spaced therefrom in said reverberant environment where it is received; simultaneously recording at a first rate the voice communication during the transmitting step at the first station; replaying the recorded voice communication in reverse time sequence and at a slower rate than that at which it was recorded; transmitting the replayed voice communication over the normal communication path between said first and said second stations; rerecording said replayed voice communication at said slower rate of speed at said second station as it is received over said communication path; replaying said rerecorded voice communication at the said first rate and in reverse time sequence than that at which it was rerecorded at said second station; and utilizing said received voice communications to extract information therefrom.
Claim 3
Dependent Claim
25 words
A method of voice communication according to claim 1 further including the step of transmitting a tone prior to the transmission of the voice communication.
Claim 4
Dependent Claim
24 words
A method of voice communication according to claim 1 in which the first rate is at least twice as fast as said slower rate.
Claim 5
Dependent Claim
24 words
A method of voice communication according to claim 2 in which the first rate is at least twice as fast as said slower rate.
Claim 6
Dependent Claim
205 words
A communication system for use in reverberant environments comprising: a voice communication transmitter having two inputs; a real-time voice communication signal source connected to one input of said voice communication transmitter; a first reversible, two-speed recorder means connected to the other input of said voice communication transmitter for selectively recording the real-time voice communication from said real-time voice communication signal source at the faster of the two speeds and to selectively replay the recorded real-time voice communication at the slower of the two speeds and in the reverse time sequence as an input for said voice communication transmitter; a voice communication receiver effectively connected to said voice communication transmitter by a communication path for receiving voice communications transmitted over said communication path; a second reversible, two-speed recorder connected to said receiver to selectively record voice communications received by said receiver at the slower one of the two speeds and to selectively play back the recorded voice communication at the faster of said two speeds and in reverse time sequence; and a utilization device effectively connected to said vocie communication receiver and to said second reversible, two-speed recorder to utilize the voice communications transmitted over said communication path and replayed by said second reversible, two-speed recorder.
Claim 7
Dependent Claim
205 words
A communication system for use in reverberant environments comprising: a voice communication transmitter having two inputs; a real-time voice communication signal source connected to one input of said voice communication transmitter; a first reversible, two-speed recorder means connected to the other input of said voice communication transmitter for selectively recording the real-time voice communication from said real-time voice communication signal source at the faster of the two speeds and to selectively replay the recorded real-time voice communication at the slower of the two speeds and in the reverse time sequence as an input for said voice communication transmitter; a voice communication receiver effectively connected to said voice communication transmitter by a communication path for receiving voice communications transmitted over said communication path; a second reversible, two-speed recorder connected to said receiver to selectively record voice communications received by said receiver at the slower one of the two speeds and to selectively play back the recorded voice communication at the faster of said two speeds and in reverse time sequence; and a utilization device effectively connected to said vocie communication receiver and to said second reversible, two-speed recorder to utilize the voice communications transmitted over said communication path and replayed by said second reversible, two-speed recorder.
Claim 8
Dependent Claim
19 words
A voice communication system according to claim 5 wherein said voice communication transmitter is a compressional wave, underwater transmitter.
Claim 9
Dependent Claim
19 words
A voice communication system according to claim 5 in which said real-time voice communication signal source is a microphone.
Claim 10
Dependent Claim
27 words
A voice communication system according to claim 5 in which said voice communication transmitter includes a tone generating means to permit transmission of predetermined duration tone signals.
Claim 11
Dependent Claim
32 words
A voice communication system according to claim 8 in which said voice communication receiver includes a tone operated switch which is responsive to the tone signals transmitted by said voice communication transmitter.
Claim 12
Dependent Claim
26 words
A voice communication system according to claim 9 in which said tone operated switch is effectively connected to said tape transport to effect speed control thereof.
References Cited (Backward Citations)
US3225142A
Cited
US3230500A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |