Patent US3922623A successfully refreshed from Google Patents.
US3922623A
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Electrical filter with a nyquist flank characteristic
Assignee: Siemens AG
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Filing: 1973-08-20
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Granted: 1975-11-25
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Expires: 1993-08-20
Abstract
Abstract An electrical filter with a Nyquist flank characteristic is provided for generating a vestigial side-band characterized in that two identical exact separating filters are connected in cascade in such a way that the output of one filter section in the first separating filter is connected to the input of the second separating filter, and in which a signal injected at the input passes through two filter sections having the same attenuation characteristics, and in that two of the filter sections of the separating filters are terminated in identical ohmic resistances, and in that the characteristic functions assigned to the filter sections are self-reciprocal functions.
Inventors
- 👤 Erwin Bucherl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:05
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01; A; A47; A47B; A47B61/00; A47B61/003
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
136 words
An electrical filter with a Nyquist flank characteristic for generating a vestigial side band comprising two identical strict divider filters each having a first filter section and a second filter section, the output of the first section of said first divider filter being connected to the input of the first section of the second divider filter, the circuit parameters being such that a signal injected at the input of said first divider filter will pass through said first section of said first filter and through the first section of said second filter with the same attenuation characteristic, said second section of each of said first and second filters being terminated in identical ohmic resistances, the attenuation functions DN1 and DN2 of said first and second filter sections of each of said divider filters being self-reciprocal functions.
Claim 2
Dependent Claim
136 words
An electrical filter with a Nyquist flank characteristic for generating a vestigial side band comprising two identical strict divider filters each having a first filter section and a second filter section, the output of the first section of said first divider filter being connected to the input of the first section of the second divider filter, the circuit parameters being such that a signal injected at the input of said first divider filter will pass through said first section of said first filter and through the first section of said second filter with the same attenuation characteristic, said second section of each of said first and second filters being terminated in identical ohmic resistances, the attenuation functions DN1 and DN2 of said first and second filter sections of each of said divider filters being self-reciprocal functions.
Claim 3
Dependent Claim
43 words
An electrical filter as set forth in claim 1 which is constructed to form a reactive four-terminal device with the operating reciprocal transfer function DB DN2, where DN is the reciprocal transfer function of one of the filter sections of the separating filter.
Claim 4
Dependent Claim
29 words
An electrical filter as set forth in claim 1, in which the characteristic functions of the filter section are symmetrized as far as the Nyquist flank characteristic is concerned.
Claim 5
Dependent Claim
29 words
An electrical filter as set forth in claim 2, in which the characteristic functions of the filter section are symmetrized as far as the Nyquist flank characteristic is concerned.
Claim 6
Dependent Claim
21 words
An electrical filter as set forth in claim 2, in which the reactive four-terminal device is designed as a ladder network.
Claim 7
Dependent Claim
21 words
An electrical filter as set forth in claim 4, in which the reactive four-terminal device is designed as a ladder network.
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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |