VIDEO SIGNAL GENERATOR

• US 3,830,974 A
• Filed: 08/01/1972
• Issued: 08/20/1974
• Est. Priority Date: 08/02/1971
• Status: Expired due to Term

• Current Assignee: Marcel Dupouy
• Original Assignee: Marcel Dupouy
• Inventors: Dupouy, Marcel
• Primary Examiner(s): Richardson, Robert L.
• Assistant Examiner(s): Saffian, Mitchell
• Application Number:
  US05/276,911
• Time in Patent Office: 749 Days
• Field of Search: 178/7.3D,DIG.6,6.8 340/324AD 315/18
• US Class Current: 348/725
• CPC Class Codes: H04N 5/275 Generation of keying signals
• CPC Class Codes: H04N 9/76 for mixing of colour signals H04N9/75 takes precedence

Abstract

Signals rephased with each cycle of the line and frame synchronization signals of a standard television system are employed to generate complex voltages. These complex voltages are utilized to produce fixed and animated displays on the screen of a television receiver.

Claims

1. In an apparatus for producing a fixed or antimated display on the cathode ray tube of a television receiver, said receiver constituting a portion of a display system including a receiver and a video adaptation circuit for converting applied signals to proper form for application to the receiver input terminals, the improvement comprising:

first oscillator means providing a first plurality of periodic signals;

first synchronizing means responsive to the receiver line scanning control signals, said first synchronizing means being coupled to said first oscillator means to produce line coherence of said first plurality of periodic signals;

means providing a second plurality of periodic signals with line coherence;

means providing a further periodic signal with receiver frame coherence;

first matrix means having a plurality of input and output terminals, said periodic signals of said first and second plurality and said further periodic signal being applied to said first matrix means, said matrix means mixing said periodic signals to provide a plurality of output signals;

a plurality of comparator means, said first matrix means output signals being applied as first inputs to individual of said comparator means;

means providing a variable steady state reference voltage as a second input to each of said comparator means;

means connected to the outputs of said comparator means for mixing the complex output signals provided thereby in response to comparison of the resistive matrix output signals and said variable reference voltages, said mixing means having a plurality of output terminals; and

means applying signals presented at said mixing means output terminals to the adaptation circuit.

2. The apparatus of claim 1 wherein said means for mixing said comparator means complex output signals includes:

logic circuit means for combining said comparator means output signals in a predetermined manner.

3. The apparatus of claim 2 wherein said means for mixing said comparator means complex output signals further includes:

second resistive matrix means, the signals generated by said logic circuit means being applied to said second resistive matrix means, said second resistive matrix means having a plurality of output terminals.

4. The apparatus of claim 1 further comprising:

means for frequency modulating the output signals provided by said first oscillator means.

5. The apparatus of claim 3 further comprising:

means for frequency modulating the output signals provided by said first oscillator means.

6. The apparatus of claim 1 further comprising:

means providing a periodic signal at a low frequency, said low frequency being less than the frequencies of any of said first or second plurality of periodic signals;

third resistive matrix means;

means applying said comparator meanS reference voltages and said low frequency signal to said third resistive matrix means to produce a mixing thereof; and

means applying output signals derived from said third resistive matrix means to said comparator means for comparison with the output signals from said first matrix means.

7. The apparatus of claim 1 further comprising:

free running oscillator means, said free running oscillator means output signal being displaced in frequency from the receiver line scanning frequency by a small amount; and

means for mixing at least one of said line coherent periodic signals with said free running oscillator signal prior to the application thereof to said first matrix means.

8. The apparatus of claim 1 wherein said first matrix means comprises:

a plurality of plug-board terminal means, each of said terminal means defining in part a pair of intersecting conductors of the matrix; and

plug means for insertion in said terminal means, said plug means including passive circuit elements of predetermined value whereby the mixture of the signals applied to the matrix and the potential of the mixing signals may be preselected.

9. The apparatus of claim 8 wherein at least one of said plug means includes a capacitive element.

10. The apparatus of claim 8 wherein at least a plurality of said plug means include resistive elements.

11. The apparatus of claim 5 wherein said first matrix means comprises:

a plurality of plug-board terminal means, each of said terminal means defining in part a pair of intersecting conductors of the matrix; and

plug means for insertion in said terminal means, said plug means including passive circuit elements of predetermined value whereby the mixture of the signals applied to the matrix and the potential of the mixing signals may be preselected.

12. The apparatus of claim 11 wherein at least a plurality of said plug means include resistive elements.

13. The apparatus of claim 12 further comprising:

free running oscillator means, said free running oscillator means output signal being displaced in frequency from the receiver line scanning frequency by a small amount; and

means for mixing at least one of said line coherent periodic signals with said free running oscillator signal prior to the application thereof to said first matrix means.