US4126829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic echo apparatus
Assignee: Novanex Automation NV
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Filing: 1977-06-27
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Granted: 1978-11-21
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Expires: 1997-06-27
Abstract
Abstract An electronic echo apparatus comprising an input amplifier, an output amplifier connected thereto through a transmission channel, a delay device connected in parallel to said channel, and a feedback path connected in parallel to said delay device, characterized in that said feedback path includes a control means, and in that there is connected to the output of the output amplifier a means for measuring the output signal of said output amplifier, comparing said output signal to a predetermined threshold value and, when said output signal reaches said threshold value, supplying a control signal to said control means for terminating the feedback.
Inventors
- 👤 Robert R. Laupman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:34
CPC Classifications
G; G10; G10K; G10K15/00; G10K15/08; G10K15/12; Y; Y10; Y10S; Y10S84/00; Y10S84/10; Y10S84/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
An electronic echo apparatus comprising an input amplifier, an output amplifier, a transmission channel connecting said input amplifier to said output amplifier, a delay device connected in parallel to said channel, and a feedback path connected between said input amplifier and said output amplifier, said feedback path including a control means, and means connected to the output of said output amplifier, for measuring the output signal of said output amplifier, comparing said output signal to a predetermined threshold value and, when said output signal reaches said threshold value, supplying a control signal to said control means for terminating the feedback.
Claim 2
Dependent Claim
100 words
An electronic echo apparatus comprising an input amplifier, an output amplifier, a transmission channel connecting said input amplifier to said output amplifier, a delay device connected in parallel to said channel, and a feedback path connected between said input amplifier and said output amplifier, said feedback path including a control means, and means connected to the output of said output amplifier, for measuring the output signal of said output amplifier, comparing said output signal to a predetermined threshold value and, when said output signal reaches said threshold value, supplying a control signal to said control means for terminating the feedback.
References Cited (Backward Citations)
US3277381A
Cited
US4005268A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-20 | 1982-05-22 | 1982-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-20 | 1986-05-22 | 1986-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-20 | 1990-05-22 | 1990-11-21 | $7700.00 | Window Closed / Lapsed |