Test signal generating system and method

Details Test signal generating system and method Test signal generating system and method

1976-04-15

1978-06-06

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

358139, H04N 962

Patent

active

040939600

ABSTRACT:
A test signal generating system and method is disclosed that is particularly well suited for servicing of television receivers and the like. A plurality of system outputs are produced that may be utilized to cause test patterns to be displayed on the image-producing device of a unit to be serviced, which test patterns are particularly useful in servicing TV receivers for checking and adjusting, if necessary, various characteristics such as linearity and pincushion distortion in scanning circuits, operation of electron beam convergence and/or color phasing and matrixing circuits where the TV receiver to be serviced is a color television receiver. The system is lightweight and portable yet produces a plurality of outputs to enhance out-of-shop servicing of TV receivers by providing greater capability without unduly complicating the same. To this end, the system employs a single rotary switch for output selection and utilizes digital circuitry. Test patterns caused to be produced include a uniform PRIMARY COLOR RASTER, COLOR BARS and VECTOR, 3.58 MHz MONITOR (for color sync oscillator), CROSSHATCH, HATCHDOTS and DOTS, with center marking being provided for CROSSHATCH, HATCHDOTS and DOTS patterns, and sixth bar color marking being provided for color bars patterns. The system also includes a single enabled oscillator to produce both the necessary offset carrier and a sweep frequency. A first hybrid modulus countdown chain is utilized to produce an offset carrier frequency with a predetermined relationship to the line frequency while maintaining phase lock between these two frequencies, and a second hybrid modulus countdown chain is utilized for count down from horizontal to vertical to produce the required number of lines per field. In addition, a high-level weighted matrix digital summing technique is utilized for producing a low-impedance system output.

REFERENCES:
patent: 3019289 (1962-01-01), Machlis
patent: 3525801 (1970-08-01), Willis
patent: 3559092 (1971-01-01), Roth
patent: 3582544 (1971-06-01), Wlasuk
patent: 3586755 (1971-06-01), Wlasuk
patent: 3634612 (1972-01-01), Stobbe
patent: 3879749 (1975-04-01), Baum

Affiliated with

Also associated with

Rating

Test signal generating system and method does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Test signal generating system and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Test signal generating system and method will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1495684