Color bar and audio signal generator

Details Color bar and audio signal generator Color bar and audio signal generator

1988-04-22

1989-11-07

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 1702

Patent

active

048795909

ABSTRACT:
Modulators for producing a composite video signal comprising composite video color bars of one volt, peak to peak, of the United States NTSC standard type, are described. The modulators include an EPROM matrix coupled to receive the outputs from a video graphics circuit and programed to produce the color bars from such outputs. The modulator also has a decoder interposed between a loop returning the output from the EPROM matrix to the video graphics circuit and thence to an output driver producing an output of color bars at one volt peak to peak into a 75 ohm load. Also described are hand-held modulators which include a self-contained electrical power source; an electronic circuit converting power from this source into a 1000 cycle sine wave audio tone signal of one volt, peak to peak at zero levelout; another electronic circuit converting power from the power source at least into composite video color bars of one volt, peak to peak, of the United States NTSC standard type; and output jacks enabling separate connections to the audio and video signals produced by the device.

REFERENCES:
patent: 4149178 (1979-04-01), Estes
patent: 4268851 (1981-05-01), Heller et al.
patent: 4635096 (1987-01-01), Morgan
1987 Fordham Catalog, p. 22.

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