US3849792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal translating channel with pre-shoot and over-shoot
Assignee: Thomas International Corp
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Filing: 1973-03-16
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Granted: 1974-11-19
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Expires: 1993-03-16
Abstract
Abstract In a color television receiver, a third video amplifier comprises an emitter follower transistor having a collector coupled to a first differentiator formed by a capacitor and resistor. A second differentiator formed by a capacitor is coupled to the first differentiator to doubly differentiate the collector signal. The doubly differentiated signal is combined with the opposite polarity output from the emitter to produce pre-shoot and over-shoot in the video output signal.
Inventors
- 👤 R Holzrichter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:30
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/20; H04N5/205; H04N5/208
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
114 words
A signal translating channel for producing pre-shoot and over-shoot in an output waveform, comprising: an active device having first, second and third electrodes; input means coupling an input waveform to said first electrode for producing second and third waveforms at said second and third electrodes, respectively; first differentiating means coupled to said second electrode for differentiating the second waVeform; second differentiating means coupled to said first differentiating means for differentiating the differentiated second waveform to produce a doubly differentiated second waveform; and combining means coupled to said second differentiating means and said third electrode for combining the doubly differentiated second waveform and the third waveform to produce pre-shoot and over-shoot in the output waveform.
Claim 2
Dependent Claim
114 words
A signal translating channel for producing pre-shoot and over-shoot in an output waveform, comprising: an active device having first, second and third electrodes; input means coupling an input waveform to said first electrode for producing second and third waveforms at said second and third electrodes, respectively; first differentiating means coupled to said second electrode for differentiating the second waVeform; second differentiating means coupled to said first differentiating means for differentiating the differentiated second waveform to produce a doubly differentiated second waveform; and combining means coupled to said second differentiating means and said third electrode for combining the doubly differentiated second waveform and the third waveform to produce pre-shoot and over-shoot in the output waveform.
Claim 3
Dependent Claim
36 words
The signal translating channel of claim 1 wherein the second and third waveforms at said second and third electrodes are of opposite polarity, said combining means summing the opposite polarity waveforms to produce said output waveform.
Claim 4
Dependent Claim
60 words
The signal translating channel of claim 1 wherein said active device comprises a transistor having a base electrode corresponding to said first electrode, and collector and emitter electrodes one of which corresponds to said second electrode and the other of which corresponds to said third electrode, and bias means connecting the electrodes of said transistor to form an emitter follower.
Claim 5
Dependent Claim
33 words
The signal translating channel of claim 3 wherein said first differentiating means includes a capacitor and a resistor coupled to said third electrode for differentiating the second waveform due to the voltage thereacross.
Claim 6
Dependent Claim
36 words
The signal translating channel of claim 4 wherein said second differentiating means comprises a capacitor coupled between said second electrode and said combining means for differentiating the differentiated second waveform produced by said first differentiating means.
Claim 7
Dependent Claim
33 words
The signal translating channel of claim 3 wherein said combining means comprises a summing junction directly coupled to said second differentiating means, and resistive means coupling said third electrode to said summing junction.
Claim 8
Dependent Claim
45 words
The signal translating channel of claim 3 wherein said bias means includes first resistive means coupled between said emitter electrode and a first reference source, and second resistive means in parallel with inductive means and coupled between said second electrode and a second reference source.
Claim 9
Dependent Claim
27 words
The signal translating channel of claim 7 including second capacitor means, and switch means for selectively connecting said second capacitor means across said first named capacitor means.
Claim 10
Dependent Claim
30 words
The signal translating channel of claim 1 including adjustment means coupleable to one of said electrodes for changing the slope of the pre-shoot and over-shoot introduced in the output waveform.
Claim 11
Dependent Claim
48 words
The signal translating channel of claim 9 wherein said adjustment means comprises reactive impedance means, switch means having a first and a second position, and circuit means connecting said reactive impedance means and said switch means between a source of reference potential and said one of said electrodes.
Claim 12
Dependent Claim
81 words
The signal translating channel of claim 1 in a color television receiver having a video delay line and a video amplifier, said input means coupling the first electrode to said video delay line to produce at said second and third electrodes a pair of video signals of opposite polarity, and said combining means summing the double differentiated second signal with the third signal of opposite polarity to the second signal to produce a video output waveform coupled to the video amplifier.
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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |