US4106008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for producing a vertical center line and horizontal synchronization signals for television type game machine
Assignee: Epoch Co Ltd
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Filing: 1976-12-03
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Granted: 1978-08-08
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Expires: 1996-12-03
Abstract
Abstract A method and apparatus for producing a vertical center line and horizontal synchronization signals for a television display device having a horizontal oscillator with a square wave output. The square wave signal is fed to two differentiation circuits. Each differentiation circuit differentiates the square wave and feeds the differentiated signal to a corresponding gate circuit, wherein each gate circuit is able to switch between an on and off state in response to the differentiated signal. A signal combination circuit combines the output signal of each gate circuit so as to provide a composite of the horizontal synchronization and vertical center line pulses to the television display device. The center line pulses are temporally centered between the horizontal synchronizing pulses because of the rising and falling edges of the square wave signal used as the triggering event for the gate circuits.
Inventors
- 👤 Hiroshi Sakurai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:27
CPC Classifications
G; G09; G09G; G09G1/00; G09G1/06; G09G1/14; G09G1/143
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
318 words
Apparatus for producing a center line pulse between horizontal synchronizing pulses for a television type display device which includes a horizontal oscillator generating a horizontal synchronizing frequency and horizontal synchronizing pulses to create a raster scan, said apparatus comprising: means for supplying a square wave signal synchronized in frequency with said horizontal synchronizing frequency; first gate means for producing said center line pulse, said first gate means being switchable between a first state providing a relatively high output signal level and a second state providing a relatively low output level signal; second gate means for producing said horizontal synchronization pulses, said second gate means being switchable between a first state providing a relatively high output signal level and a second state providing a relatively low output signal level; first means for differentiating said square wave signal and providing positive and negative output signals indicative of the positive going edge and the negative going edge of said square wave at each respective occurrence, said first differentiating means being electrically connected to the input of said first gate means so as to normally bias said first gate means to said first state and also to provide said differentiated square wave output signal to said first gate means; second means for differentiating said square wave signal and providing positive and negative output signals indicative of the positive going edge and the negative going edge of said square wave at each respective occurrence, said second differentiating means being electrically connected to the input of said second gate means so as to normally bias said second gate means to said second state and also to provide said differentiated square wave output signal to said second gate means; and means for electrically combining said output signals of said first gate means and said second gate means into a single output signal as a composite of said center line pulses and said horizontal synchronizing pulses.
Claim 2
Dependent Claim
318 words
Apparatus for producing a center line pulse between horizontal synchronizing pulses for a television type display device which includes a horizontal oscillator generating a horizontal synchronizing frequency and horizontal synchronizing pulses to create a raster scan, said apparatus comprising: means for supplying a square wave signal synchronized in frequency with said horizontal synchronizing frequency; first gate means for producing said center line pulse, said first gate means being switchable between a first state providing a relatively high output signal level and a second state providing a relatively low output level signal; second gate means for producing said horizontal synchronization pulses, said second gate means being switchable between a first state providing a relatively high output signal level and a second state providing a relatively low output signal level; first means for differentiating said square wave signal and providing positive and negative output signals indicative of the positive going edge and the negative going edge of said square wave at each respective occurrence, said first differentiating means being electrically connected to the input of said first gate means so as to normally bias said first gate means to said first state and also to provide said differentiated square wave output signal to said first gate means; second means for differentiating said square wave signal and providing positive and negative output signals indicative of the positive going edge and the negative going edge of said square wave at each respective occurrence, said second differentiating means being electrically connected to the input of said second gate means so as to normally bias said second gate means to said second state and also to provide said differentiated square wave output signal to said second gate means; and means for electrically combining said output signals of said first gate means and said second gate means into a single output signal as a composite of said center line pulses and said horizontal synchronizing pulses.
Claim 3
Dependent Claim
37 words
Apparatus as in claim 1, wherein said first differentiating means has an input and an output, and includes a capacitor connected between said input and said output and a resistor connected between said output and electrical ground.
Claim 4
Dependent Claim
37 words
Apparatus as in claim 1, wherein said second differentiating means has an input and an output, and includes a capacitor connected between said input and said output and a resistor connected between said output and electrical ground.
Claim 5
Dependent Claim
76 words
Apparatus as in claim 1, wherein said first gate means includes an active element consisting of a transistor, an emitter of said active element being electrically connected to said output of said first differentiating means, a base of said active element being connected in series with a resistor to a first bias voltage, and a collector of said active element being electrically connected to a first inverter to supply said output of said first gate means.
Claim 6
Dependent Claim
73 words
Apparatus as in claim 1, wherein said second gate means includes an active element, an emitter of said active element being electrically connected to said output of said second differentiating means, a base of said active element being connected in series with a resistor to a second bias voltage, and a collector of said active element being electrically connected to a second inverter circuit to supply said output of said second gate means.
Claim 7
Dependent Claim
98 words
Apparatus as in claim 2, wherein said means for electrically combining said output signals of said first gate means and said second gate means includes a solid state diode having the cathode electrode connected to the output of said first gate means, a second solid state diode having the cathode electrode connected to the output of said second gate means, the anode electrodes of said diodes being connected together, and in turn connected to a voltage divider network consisting of a first and second resistor with said composite signal output being taken from the junction of said resistors.
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) | 1981-08-07 | 1982-02-06 | 1982-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-07 | 1986-02-06 | 1986-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-07 | 1990-02-06 | 1990-08-08 | $7700.00 | Window Closed / Lapsed |