US3868604A
Expired / Lapsed
US
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Constant resistance adjustable slope equalizer
Assignee: Blonder Tongue Laboratories Inc
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Filing: 1974-04-08
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Granted: 1975-02-25
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Expires: 1994-04-08
Abstract
Abstract This disclosure is concerned with a novel constant resistance adjustable attenuation versus frequency slope equalizer using a resonant in-phase path and a dual impedance resonant network outof-phase path intermediately containing a constant resistance attenuator.
Inventors
- 👤 Ben H Tongue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:54
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/14; H04B3/143; H04B3/145
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
A constant resistance adjustable attenuation versus frequency slope equalizer having, in combination, input and output terminals have in-phase and out-of-phase paths therebetween, a resonant network connected in the in-phase path, a dual resonant network divided into a pair of equal halves separated by a constant resistance attenuator connected therebetween and in the out-of-phase path, and means for varying the constant resistance attenuator to vary its loss, the equalizer thereby producing varying attenuation versus frequency slopes with constant overall network terminal driving point resistance.
Claim 2
Dependent Claim
83 words
A constant resistance adjustable attenuation versus frequency slope equalizer having, in combination, input and output terminals have in-phase and out-of-phase paths therebetween, a resonant network connected in the in-phase path, a dual resonant network divided into a pair of equal halves separated by a constant resistance attenuator connected therebetween and in the out-of-phase path, and means for varying the constant resistance attenuator to vary its loss, the equalizer thereby producing varying attenuation versus frequency slopes with constant overall network terminal driving point resistance.
Claim 3
Dependent Claim
31 words
A constant resistance adjustable attenuation versus frequency slope equalizer as claimed in claim 1 and in which autotransformer means is connected between the in-phase and out-of-phase paths at the input terminals.
Claim 4
Dependent Claim
46 words
A constant resistance adjustable attenuation versus frequency slope equalizer as claimed in claim 2 and in which said autotransformer means is provided with a grounded intermediate tap, said constant resistance attenuator is grounded, and said output terminals are terminated in a grounded characteristic impedance resistive load.
Claim 5
Dependent Claim
45 words
A constant resistance adjustable attenuation versus frequency slope equalizer as claimed in claim 2 and in which said autotransformer means is provided with two unconnected windings, said constant resistance attenuator is grounded, and said output terminals are terminated in a grounded characteristic impedance resistive load.
Claim 6
Dependent Claim
38 words
A constant resistance adjustable attenuation versus frequency slope equalizer as claimed in claim 1 and in which said resonant network is a series resonant circuit and said dual resonant network comprises a pair of equal parallel resonant networks.
Claim 7
Dependent Claim
35 words
A constant resistance adjustable attenuation versus frequency slope equalizer as claimed in claim 1 and in which said constant resistance attenuator is of the pi-type wherein the series arm varies oppositely with the parallel arms.
References Cited (Backward Citations)
US3231837A
Cited
US3794936A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |