US4125899A
Expired / Lapsed
US
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Bessel function type automatic delay equalizer
Assignee: KDDI Corp
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Filing: 1977-06-17
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Granted: 1978-11-14
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Expires: 1997-06-17
Abstract
Abstract A Bessel function type automatic delay equalizer comprising a plurality of transversal filters each of which has an independent delay cosine equalization component having a predetermined period, and the superposition of those filters providing the desired characteristics, characterized in that, said equalizer further comprises a Bessel function generator for controlling the tap gain of said transversal filters.
Inventors
- 👤 Kazuo Kawai
- 👤 Michitoshi Tamori
- 👤 Hidetaka Yanagidaira
- 👤 Sotokichi Shintani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:09
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/14; H04B3/141; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03012; H04L25/03019; H04L25/03038
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
103 words
A bessel function type automatic delay equalizer comprising (a) a plurality of cascaded transversal filters, each having an independent delay cosine equalization component having a predetermined period, (b) measuring means for measuring the discrete delay characteristics of a transmission line on the frequency axis using a sweep signal, (c) a switch means for alternately connecting the input terminal of the equalizer and the transmission line to be equalized to said transversal filters or to the measuring means of the delay characteristics, (d) generating means, coupled to the measuring means, for generating the inverse of the measured delay characteristics, (e) inverse matrix memory means,
Claim 2
Dependent Claim
103 words
A bessel function type automatic delay equalizer comprising (a) a plurality of cascaded transversal filters, each having an independent delay cosine equalization component having a predetermined period, (b) measuring means for measuring the discrete delay characteristics of a transmission line on the frequency axis using a sweep signal, (c) a switch means for alternately connecting the input terminal of the equalizer and the transmission line to be equalized to said transversal filters or to the measuring means of the delay characteristics, (d) generating means, coupled to the measuring means, for generating the inverse of the measured delay characteristics, (e) inverse matrix memory means,
Claim 3
Dependent Claim
166 words
(f) weight matrix memory means, (g) a first multiplication means, coupled to said inverse matrix memory means and said weight matrix memory means, for obtaining the product of a predetermined inverse matrix concerning the cosine component and a predetermined weight matrix, (h) a second multiplication means, coupled to said first multiplication means and said generating means, for obtaining the product of the output of said first multiplication means and the inverse of the measured delay characteristics, (i) a Bessel function generator for providing the Bessel function of the output of said second multiplication means, (j) means for applying the output of said Bessel function generator to said transversal filters for controlling the tap gain of the transversal filters, (k) a negative pair type transversal filter connected in series to said transversal filters, said negative pair type transversal filter being controlled by the output of said second multiplication means, (l) an output terminal of the equalizer connected to the output of the negative pair type transversal filter.
Claim 4
Dependent Claim
166 words
(f) weight matrix memory means, (g) a first multiplication means, coupled to said inverse matrix memory means and said weight matrix memory means, for obtaining the product of a predetermined inverse matrix concerning the cosine component and a predetermined weight matrix, (h) a second multiplication means, coupled to said first multiplication means and said generating means, for obtaining the product of the output of said first multiplication means and the inverse of the measured delay characteristics, (i) a Bessel function generator for providing the Bessel function of the output of said second multiplication means, (j) means for applying the output of said Bessel function generator to said transversal filters for controlling the tap gain of the transversal filters, (k) a negative pair type transversal filter connected in series to said transversal filters, said negative pair type transversal filter being controlled by the output of said second multiplication means, (l) an output terminal of the equalizer connected to the output of the negative pair type transversal filter.
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) | 1981-11-13 | 1982-05-15 | 1982-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-13 | 1986-05-15 | 1986-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-13 | 1990-05-15 | 1990-11-14 | $7700.00 | Window Closed / Lapsed |