US3553365A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for deriving noise-free synchronizing information from the sync signal of a television signal
Assignee: Robert Bosch Fernsehanlagen GmbH
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Filing: 1968-02-23
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Granted: 1971-01-05
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Expires: 1988-02-23
Abstract
Abstract An electronic circuit arrangement for extracting noise-free synchronizing information from the sync signal of a television signal. The sync signal is applied to a differentiating circuit which provides spike-shaped impulses corresponding to the leading and trailing edges of the sync pulse. The leading or front edge of the pulse after differentiation is used to actuate a timing network in the form of an oscillator circuit or a delay line. The period of oscillation of the oscillator is made equal to the pulse width of the sync pulse. After the spike-impulse has been delayed for the duration of the sync pulse, it is applied to a comparison circuit which has as its second input the trailing edge of the sync pulse. If the two inputs to the comparator circuit occur at the same instant of time, an output is provided by the comparator indicating the presence of this condition. When the delay line is used the delay is made equal to the duration of the sync pulse.
Inventors
- 👤 Edmund Jauernik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:47
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/04; H04N5/08; H04N5/10; H04N5/14; H04N5/21; H04N9/00; H04N9/64; H04N9/74; H04N9/76
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
229 words
An arrangement for deriving noise-free synchronizing information from the sync signal of a television signal, comprising, in combination, a resistor-capacitor network for differentiating the line sync pulse separated from said television signal and generating thereby a spike-shaped pulse corresponding to the leading edge of said line sync pulse; oscillator means with an inductor connected in parallel with a capacitor and actuated by the leading edge of said sync pulse and having a period of oscillation equal to that of the pulse duration of said sync pulse, said oscillator means being timing means for delaying said spike-shaped pulse by the duration of said line sync pulse; AND-gate with two transistors, the base of one transistor being connected to the output of said oscillating means and the base of the other one of said two transistors being connected to the output of said resistance-capacitance network, said AND-gate providing an output signal when said spike-shaped pulse in said trailing edge of said sync pulse are applied to the inputs of said AND-gate simultaneously and at the same instant of time, so that said AND-gate compares on a time basis the trailing edge of said sync pulse with said spike-shaped pulse after having been delayed by said oscillating means; and transistor means connected between said resistance-capacitance network and said oscillating means for impedance conversion and applying said spike-shaped pulse to said oscillator means.
Claim 2
Dependent Claim
229 words
An arrangement for deriving noise-free synchronizing information from the sync signal of a television signal, comprising, in combination, a resistor-capacitor network for differentiating the line sync pulse separated from said television signal and generating thereby a spike-shaped pulse corresponding to the leading edge of said line sync pulse; oscillator means with an inductor connected in parallel with a capacitor and actuated by the leading edge of said sync pulse and having a period of oscillation equal to that of the pulse duration of said sync pulse, said oscillator means being timing means for delaying said spike-shaped pulse by the duration of said line sync pulse; AND-gate with two transistors, the base of one transistor being connected to the output of said oscillating means and the base of the other one of said two transistors being connected to the output of said resistance-capacitance network, said AND-gate providing an output signal when said spike-shaped pulse in said trailing edge of said sync pulse are applied to the inputs of said AND-gate simultaneously and at the same instant of time, so that said AND-gate compares on a time basis the trailing edge of said sync pulse with said spike-shaped pulse after having been delayed by said oscillating means; and transistor means connected between said resistance-capacitance network and said oscillating means for impedance conversion and applying said spike-shaped pulse to said oscillator means.
Claim 3
Dependent Claim
34 words
The arrangement for deriving noise-free synchronizing information from the sync signal of a television signal as defined in claim 1 wherein said oscillator means includes delay line means comprised of inductor and capacitor elements.
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |