Patent US3912864A successfully refreshed from Google Patents.
US3912864A
Expired / Lapsed
US
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Circuit arrangement for supplying pulses having a defined pulse edge duration in a television image signal
Assignee: US Philips Corp
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Filing: 1973-08-03
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Granted: 1975-10-14
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Expires: 1993-08-03
Abstract
Abstract A circuit arrangement for supplying line blanking or line synchronizing pulses having a defined pulse edge duration in a television image signal, formed with an amplifier circuit to which the image signal is applied and the output of which is connected to a signal comparator circuit to which also a signal having pulses of the defined edge duration is applied. If the output signal of the amplifier circuit exceeds the said signal with the pulses due to the supply of the image signal, this would be prevented by the amplification being reduced by the signal comparator circuit.
Inventors
- 👤 Der Valk Nicolaas Jan Leen Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:09
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/04; H04N5/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
158 words
A circuit arrangement for supplying pulses having a defined pulse edge duration in a television image signal, the circuit arrangement comprising a signal converter provided with an input for the supply of a line blanking signal or a line synchronizing signal associated with a television standard, and an output conveying a signal having pulses of defined pulse edge duration, an amplifier circuit having an input for the supply of the image signal and an output which is connected to an input of a signal comparator circuit having a further input coupled to said converter output for the supply of said signal having pulses of the defined pulse edge duration, the output of said signal comparator circuit being connected to a control input of the amplifier circuit for reducing its amplification if the amplitude of the output signal thereof exceeds the amplitude of said signal having pulses of defined pulse edge duration while the image signal is being supplied.
Claim 2
Dependent Claim
158 words
A circuit arrangement for supplying pulses having a defined pulse edge duration in a television image signal, the circuit arrangement comprising a signal converter provided with an input for the supply of a line blanking signal or a line synchronizing signal associated with a television standard, and an output conveying a signal having pulses of defined pulse edge duration, an amplifier circuit having an input for the supply of the image signal and an output which is connected to an input of a signal comparator circuit having a further input coupled to said converter output for the supply of said signal having pulses of the defined pulse edge duration, the output of said signal comparator circuit being connected to a control input of the amplifier circuit for reducing its amplification if the amplitude of the output signal thereof exceeds the amplitude of said signal having pulses of defined pulse edge duration while the image signal is being supplied.
Claim 3
Dependent Claim
48 words
A circuit arrangement as claimed in claim 1, wherein the signal converter includes a controlled current source connected to the input for applying a substantially constant current to a capacitor so that the voltage thereacross produces the pulse having the defined pulse edge duration at said converter output.
Claim 4
Dependent Claim
54 words
A circuit arrangement as claimed in claim 1, wherein in case of line blanking pulse introduction in the image signal the said input of the amplifier circuit is connected to an output of a signal processing circuit in which a line blanking pulse having nondefined steep pulse edges is added to the image signal.
Claim 5
Dependent Claim
88 words
A circuit arrangement as claimed in claim 3, wherein said signal converter includes a second output conveying the said line blanking pulse having non-defined steep pulse edges for the supply to said signal processing circuit. 5. A circuit arrangement as claimed in claim 2, wherein the signal converter is provided with a second output conveying said line blanking pulse having non-defined steep pulse edges for supply to said signal processing circuit and with a pulse generator including a threshold circuit which connects said capacitor to said second output.
Claim 6
Dependent Claim
88 words
A circuit arrangement as claimed in claim 1, wherein the signal comparator circuit is formed with two transistors whose emitters are connected together and through a resistor to a voltage and whose bases are each connected to a different one of the said comparator inputs, the collector of the transistor whose base is connected to the input for the supply of the said pulse having the defined pulse edge duration being connected through a resistor to a voltage and furthermore to the output of the signal comparator circuit.
Claim 7
Dependent Claim
28 words
A circuit arrangement as claimed in claim 1, wherein the amplifier circuit is formed with an amplifier having a feedback circuit to which the control input is connected.
Claim 8
Dependent Claim
42 words
A circuit arrangement as claimed in claim 7, wherein the control input in the feedback circuit is connected to a gate electrode of a transistor of which a source and a drain electrode are arranged in parallel with a resistor present therein.
Claim 9
Dependent Claim
105 words
A circuit comprising a signal converter having an input for receiving a sharp edge pulse signal, and an output for providing a gradual edge pulse signal; a variable gain device having a first input for receiving an information signal, a second gain control input, and an output for supplying an output signal; and a signal comparator having a first input coupled to said converter output, a second input coupled to said device output, and an output coupled to said gain control input for reducing the gain of said device when the amplitude of said output signal exceeds the amplitude of said gradual edge pulse signal.
Claim 10
Dependent Claim
105 words
A circuit comprising a signal converter having an input for receiving a sharp edge pulse signal, and an output for providing a gradual edge pulse signal; a variable gain device having a first input for receiving an information signal, a second gain control input, and an output for supplying an output signal; and a signal comparator having a first input coupled to said converter output, a second input coupled to said device output, and an output coupled to said gain control input for reducing the gain of said device when the amplitude of said output signal exceeds the amplitude of said gradual edge pulse signal.
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) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |