US3757236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Band pass filter and detection circuit
Assignee: Avco Corp
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Filing: 1971-12-17
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Granted: 1973-09-04
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Expires: 1991-12-17
Abstract
Abstract There is herein disclosed a combination involving a limiter, a first active high pass filter, and a level detector in cascade. The first high pass filter is paralleled by an arrangement of second active high pass filter and inhibit circuit in cascade. The first filter accepts frequencies above a first cut-off point and the second filter accepts frequencies above a higher cut-off point and the output of the inhibitor is used to inhibit the output of the first filter. The result is a band pass detector which responds to frequencies within the range defined by the cut-offs.
Inventors
- 👤 M Langan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:14
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
138 words
A band pass network which is adapted to be coupled to the output of a source of signals to pass an acceptable range of frequencies comprising: a first active high pass filter proportioned to reject all frequencies below the lowest acceptable frequency, a second active high pass filter designed to reject all frequencies below the highest acceptable frequency, said active filters having inputs connected in parallel to the output of the source of signals and also having separate outputs, said first filter also having a second input, means intercoupled between the output of the second filter and the input of the first filter for inhibiting the operation of the first filter when frequencies in excess of the highest acceptable frequency are being applied, and a level detector having an input coupled to the output of said first filter.
Claim 2
Dependent Claim
138 words
A band pass network which is adapted to be coupled to the output of a source of signals to pass an acceptable range of frequencies comprising: a first active high pass filter proportioned to reject all frequencies below the lowest acceptable frequency, a second active high pass filter designed to reject all frequencies below the highest acceptable frequency, said active filters having inputs connected in parallel to the output of the source of signals and also having separate outputs, said first filter also having a second input, means intercoupled between the output of the second filter and the input of the first filter for inhibiting the operation of the first filter when frequencies in excess of the highest acceptable frequency are being applied, and a level detector having an input coupled to the output of said first filter.
Claim 3
Dependent Claim
17 words
The combination in accordance with claim 1 and including a signal source proportioned to supply square waves.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |