US3885111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Terminal equipment for lincompex telephone system
Assignee: KDDI Corp
•
Filing: 1973-05-14
•
Granted: 1975-05-20
•
Expires: 1993-05-14
Abstract
Abstract A terminal equipment employed in a lincompex telephone system, in which a constant-level voice signal obtained by compressing a voice signal to a substantially constant level and level information indicating instantaneous level changes of the voice signal before compressed are mutually transmitted between an opposed pair of terminal equipments through a two way transmission medium and, in each terminal equipment, the original voice signal is reproduced from the transmitted constant-level voice signal and the level information. In accordance with this invention, the level information received and that to be transmitted are compared with each other and controlled in each terminal equipment. When the received level information is larger than that to be transmitted and also a predetermined first threshold value, the transmitting level information is controlled to be fixed at lower level information corresponding to a second threshod value sufficiently smaller than the first threshold value. When the received level information is smaller than the first threshold value and, when the level information to be transmitted is larger than the received level information while the received level information is larger than the first threshod valve, fixing of the transmitted level information at the lower level information is released.
Inventors
- 👤 Hikoichi Ishigami
- 👤 Akira Sato
- 👤 Seishi Kitayama
- 👤 Kouhei Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:01
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
383 words
A terminal equipment for a lincompex telephone system comprising: first input terminal means for receiving a first voice signal from a near-end subscriber; first level means connected to the first input terminal means for producing a first level signal representative of the instantaneous level changes of the first voice signal and having a different frequency range than said first voice signal; compressor means connected to the first input signal terminal means and said first level means for compressing said first voice signal in response to said first level signal to produce a first constant-level voice signal; first output terminal means electrically coupled to the first compressor means and the first level means for sending out the first constant-level voice signal and the first level signal to the far-end subscriber; second input terminal means for receiving a second constantlevel voice signal and a second level signal from a far-end subscriber, the second constant-level voice corresponding to a constant-level compressed signal of a second voice signal from the far-end subscriber, the second constant-level signal being representative of the instantaneous level changes of the second voice signal; second level means connected to the second input terminal means for detecting the second level signal; expander means connected to the second input terminal means and the second level means for reproducing the second voice signal from the second constant-level voice signal and the detected second level signal; second output terminal means electrically coupled to the expander means for sending out the reproduced second voice signal to the near-end subscriber; comparator means electrically coupled to said second level means for producing a second control output when the second level signal exceeds a first threshold level; control means connected to the comparator means and the threshold means for fixing the first level signal to a second threshold level sufficiently lower than the first level signal in response to only the simultaneous existance of the first control signal and the second control signal; and said control means comprising an inhibit circuit for inhibiting the second control signal in response to the first control signal, and a bias cirCuit connected to the output of the inhibit circuit and the first level means for fixing the first level signal to the second threshold level in response to the output of the inhibit circuit.
Claim 2
Dependent Claim
383 words
A terminal equipment for a lincompex telephone system comprising: first input terminal means for receiving a first voice signal from a near-end subscriber; first level means connected to the first input terminal means for producing a first level signal representative of the instantaneous level changes of the first voice signal and having a different frequency range than said first voice signal; compressor means connected to the first input signal terminal means and said first level means for compressing said first voice signal in response to said first level signal to produce a first constant-level voice signal; first output terminal means electrically coupled to the first compressor means and the first level means for sending out the first constant-level voice signal and the first level signal to the far-end subscriber; second input terminal means for receiving a second constantlevel voice signal and a second level signal from a far-end subscriber, the second constant-level voice corresponding to a constant-level compressed signal of a second voice signal from the far-end subscriber, the second constant-level signal being representative of the instantaneous level changes of the second voice signal; second level means connected to the second input terminal means for detecting the second level signal; expander means connected to the second input terminal means and the second level means for reproducing the second voice signal from the second constant-level voice signal and the detected second level signal; second output terminal means electrically coupled to the expander means for sending out the reproduced second voice signal to the near-end subscriber; comparator means electrically coupled to said second level means for producing a second control output when the second level signal exceeds a first threshold level; control means connected to the comparator means and the threshold means for fixing the first level signal to a second threshold level sufficiently lower than the first level signal in response to only the simultaneous existance of the first control signal and the second control signal; and said control means comprising an inhibit circuit for inhibiting the second control signal in response to the first control signal, and a bias cirCuit connected to the output of the inhibit circuit and the first level means for fixing the first level signal to the second threshold level in response to the output of the inhibit circuit.
Claim 3
Dependent Claim
43 words
A terminal equipment according to claim 1, in which said first compressor means includes a switch circuit controlled by the output of the inhibit circuit so as to cut-off a path between the first input terminal means and the first output terminal means.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |