US3628162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Envelope delay correction link
Assignee: US Philips Corp
•
Filing: 1969-07-01
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Granted: 1971-12-14
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Expires: 1989-07-01
Abstract
Abstract A circuit for correcting nonuniform transmission delay of a television signal has two parallel coupled channels coupled to receive said signal. The first contains a damped resonant circuit, the second a phase inverter. A MOSFET can be the variable damping, while voltage variable diodes can be in the tuned circuit. A rectifier supplies a control voltage from the input signal to the diodes.
Inventors
- 👤 Peter Lison Lunden
- 👤 Anders Gustaf Lyden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:58
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/14; H04B3/142; H03; H03H; H03H11/00; H03H11/02; H03H11/16; H03H11/20
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
108 words
A delay distortion correction circuit comprising an input means for receiving an input signal to be corrected; a current source circuit coupled to said input means for supplying an output current depending on said input signal; a parallel resonance circuit coupled to receive said output current; a damping resistance coupled to said resonant circuit; a second resistance coupled to said resonant circuit; a current combination circuit serially coupled to said damping resistance and also coupled to said second resistance; whereby an output signal is obtained from said current combination circuit having a frequency dependent phase relationship and a frequency independent amplitude relationship with respect to said input signal.
Claim 2
Dependent Claim
108 words
A delay distortion correction circuit comprising an input means for receiving an input signal to be corrected; a current source circuit coupled to said input means for supplying an output current depending on said input signal; a parallel resonance circuit coupled to receive said output current; a damping resistance coupled to said resonant circuit; a second resistance coupled to said resonant circuit; a current combination circuit serially coupled to said damping resistance and also coupled to said second resistance; whereby an output signal is obtained from said current combination circuit having a frequency dependent phase relationship and a frequency independent amplitude relationship with respect to said input signal.
Claim 3
Dependent Claim
20 words
A circuit as claimed in claim 1, wherein said second resistance comprises the input resistance of said current combination circuit.
Claim 4
Dependent Claim
32 words
A circuit as claimed in claim 2 wherein said combination circuit comprises an amplifier having an input and an output, and a negative feedback resistor coupled between said input and said output.
Claim 5
Dependent Claim
18 words
A circuit as claimed in claim 1 wherein said current source circuit comprises two transistors coupled in cascode.
Claim 6
Dependent Claim
27 words
A circuit as claimed in claim 1 wherein said current source circuit comprises a transistor and an adjustable resistor coupled between said transistor and said input means.
Claim 7
Dependent Claim
55 words
A circuit as claimed in claim 1 wherein said parallel resonance circuit comprises a coil having a tap coupled to ground, one end of said coil being coupled through said damping resistance to said current combination circuit; and further comprising a variable capacitor coupled between said combination circuit and the remaining end of said coil.
Claim 8
Dependent Claim
16 words
A circuit as claimed in claim 1 wherein said current source circuit comprises two current sources.
Claim 9
Dependent Claim
17 words
A circuit as claimed in claim 7 wherein at least one of the current sources is adjustable.
Claim 10
Dependent Claim
21 words
A circuit as claimed in claim 1 further comprising a current loss compensation circuit coupled between said resonant and combination circuits.
Claim 11
Dependent Claim
16 words
A circuit as claimed in claim 1 wherein said resonance circuit comprises a voltage dependent element.
Claim 12
Dependent Claim
20 words
A circuit as claimed in claim 10 further comprising a detection device coupled between said input means and said element.
Claim 13
Dependent Claim
47 words
A circuit as claimed in claim 1 further comprising a second resonance circuit tuned to a different frequency than that of said first resonant circuit, each of said resonant circuits having a voltage dependent element; and a detection device coupled between said input means and said elements.
Claim 14
Dependent Claim
18 words
A circuit as claimed in claim 11 wherein said detection device comprises two detection cirCuits of opposite polarity.
Claim 15
Dependent Claim
34 words
A circuit as claimed in claim 11 wherein said detection device comprises a plurality of detection circuits each having a different threshold, and an adding circuit coupled between said detection circuits and said elements.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |