Identifier circuits for color-bar-type test generators

Claim 2

In a color bar test generator of the type adapted to produce a test signal which is to be displayed as a plurality of bars of different color on the face of a picture tube of a color television receiver, said test signal being generated to provide said plurality of bars in accordance with a synchronizing pulse of a predetermined rate associated with a television display, the combination including: a. means for providing an indicator signal of a predetermined time relation with respect to said synchronizing pulse to occur during a portion of said test signal representative of one of said color bars, and b. means responsive to said indicator signal for combining the same with said test signal for causing that portion of said test signal corresponding to said color bar to differ from the remainder of said test signal corresponding to other bars in a manner to illuminate said color bar differently on the face of said picture tube.

Claim 3

In a color television test apparatus of the type employing an oscillator operating at a frequency equal to the color subcarrier frequency offset by a frequency approximately equal to the horizontal line frequency, and having an output coupled to a gating circuit, which is gated on and off by a master oscillator signal having a repetition rate approximately equal to n times said horizontal line rate, where n is a positive integer above one, to provide at an output thereof a series of burst signals differing in phase from one another during one horizontal line, said generator including a translating circuit to translate said master oscillator frequency by said factor of n to produce horizontal sync and combining means for adding said sync to said burst signal to provide at an output a composite video signal which upon application to color television receiver circuits produces on the face of a kinescope included in said receiver, a series of vertical bars each of a color determined in accordance with the phase of said bursts, in combination therewith, apparatus for indicating the phase of said bursts by effecting the brightness of a preselected number of said vertical bars, comprising, a. first means coupled to said translating circuit to provide a second series of signals having a repetition rate which is a submultiple of saiD master oscillator signal, and b. means coupling said first means to said combining means for adding said second series of signals to said composite signal to accurately indicate any selected number of said series of bursts, whereby said vertical bars associated with said selected number of series of bursts is illuminated differently on said face of said kinescope from any other burst not so indicated.

Claim 4

In a color television test apparatus of the type employing an oscillator operating at a frequency equal to the color subcarrier frequency offset by a frequency approximately equal to the horizontal line frequency, and having an output coupled to a gating circuit, which is gated on and off by a master oscillator signal having a repetition rate approximately equal to n times said horizontal line rate, where n is a positive integer above one, to provide at an output thereof a series of burst signals differing in phase from one another during one horizontal line, said generator including a translating circuit to translate said master oscillator frequency by said factor of n to produce horizontal sync and combining means for adding said sync to said burst signal to provide at an output a composite video signal which upon application to color television receiver circuits produces on the face of a kinescope included in said receiver, a series of vertical bars each of a color determined in accordance with the phase of said bursts, in combination therewith, apparatus for indicating the phase of said bursts by effecting the brightness of a preselected number of said vertical bars, comprising, a. first means coupled to said translating circuit to provide a second series of signals having a repetition rate which is a submultiple of saiD master oscillator signal, and b. means coupling said first means to said combining means for adding said second series of signals to said composite signal to accurately indicate any selected number of said series of bursts, whereby said vertical bars associated with said selected number of series of bursts is illuminated differently on said face of said kinescope from any other burst not so indicated.

Claim 5

In a color bar generator of the type employing an oscillator operating at a frequency equal to the color subcarrier frequency offset by the horizontal line frequency, and having an output coupled to a gating circuit, which is gated on and off by a master oscillator signal having a repetition rate approximately equal to 12 times said horizontal line rate, to provide at an output thereof a series of burst signals differing in phase from one another by approximately 30* during one horizontal line, said generator including a divider circuit to divide said master oscillator frequency by a factor of 12 to produce horizontal sync and combining means for adding said sync to said burst signal to provide at an output a composite video signal which upon application to color television receiver circuits produces a series of vertical bars each of a color in accordance with the phase of said bursts on the face of a kinescope employed therein, in combination therewith, the improvement comprising, a. first means coupled to said divider to provide a second series of signals having a repetition rate which is a submultiple of said master oscillator signal and greater than said horizontal line rate, b. means coupling said first means to said combining means for superimposing said second series of pulses on said composite signal to accurately indicate a preselected number of said series of bursts included in said composite signal, to cause said vertical bars related to said preselected bursts to appear at a different brightness level in accordance with the magnitude of said second series of pulses.

Claim 6

In a color bar generator of the type employing an oscillator operating at a frequency equal to the color subcarrier frequency offset by the horizontal line frequency, and having an output coupled to a gating circuit, which is gated on and off by a master oscillator signal having a repetition rate approximately equal to 12 times said horizontal line rate, to provide at an output thereof a series of burst signals differing in phase from one another by approximately 30* during one horizontal line, said generator including a divider circuit to divide said master oscillator frequency by a factor of 12 to produce horizontal sync and combining means for adding said sync to said burst signal to provide at an output a composite video signal which upon application to color television receiver circuits produces a series of vertical bars each of a color in accordance with the phase of said bursts on the face of a kinescope employed therein, in combination therewith, the improvement comprising, a. first means coupled to said divider to provide a second series of signals having a repetition rate which is a submultiple of said master oscillator signal and greater than said horizontal line rate, b. means coupling said first means to said combining means for superimposing said second series of pulses on said composite signal to accurately indicate a preselected number of said series of bursts included in said composite signal, to cause said vertical bars related to said preselected bursts to appear at a different brightness level in accordance with the magnitude of said second series of pulses.

Claim 7

The combination according to claim 3 wherein said first means coupled to said divider provides a series of pulses having a repetition rate equal to four times said horizontal line rate.

Claim 8

Color television test apparatus comprising, a. a first oscillator for producing pulses having a first repetition rate, b. a divider coupled to said oscillator for providing pulses at an output thereof having a second repetition rate which is a given submultiple of said first, c. a second oscillator for providing a signal having a given frequency, d. a coincidence circuit, e. first means for applying said signal from said second oscillator to said coincidence circuit, f. second means for applying said pulses of said first repetition rate to said coincidence circuit to provide at an output thereof said second oscillator signal when one of said pulses is present at said coincidence circuit, g. third means coupled to said divider responsive to said signal at said second repetition rate to provide a third series of pulses having a pulse width less than that of said first and second pulses and occurring in time coincidence with the leading edge of every one of said first pulses occurring at said given submultiple, h. a combining circuit coupled to said coincidence circuit and responsive to said third pulses to provide at an output the signal from said coincidence circuit plus said third series of pulses superimposed thereon.

Claim 9

Color television test apparatus comprising, a. a first oscillator for producing pulses having a first repetition rate, b. a divider coupled to said oscillator for providing pulses at an output thereof having a second repetition rate which is a given submultiple of said first, c. a second oscillator for providing a signal having a given frequency, d. a coincidence circuit, e. first means for applying said signal from said second oscillator to said coincidence circuit, f. second means for applying said pulses of said first repetition rate to said coincidence circuit to provide at an output thereof said second oscillator signal when one of said pulses is present at said coincidence circuit, g. third means coupled to said divider responsive to said signal at said second repetition rate to provide a third series of pulses having a pulse width less than that of said first and second pulses and occurring in time coincidence with the leading edge of every one of said first pulses occurring at said given submultiple, h. a combining circuit coupled to said coincidence circuit and responsive to said third pulses to provide at an output the signal from said coincidence circuit plus said third series of pulses superimposed thereon.

Claim 10

The color television test apparatus according to claim 5, wherein a. said divider coupled to said oscillator operates to provide pulses having a second repetition rate which is one-fourth said first repetition rate.

Claim 11

Test apparatus for a color receiver for providing a composite video signal including a predetermined number of time intervals and containing information including horizontal and vertical synchronizing components, and video components, which signal upon application to a color televisIon receiver causes a color bar pattern to be displayed on the face of a kinescope included therein, comprising, a. a master oscillator operating at a given first frequency, selected according to said predetermined number of time intervals, b. a reference oscillator operating at a frequency approximately equal to the color subcarrier reference frequency offset by said horizontal synchronizing rate, c. a coincidence circuit having first and second input terminals and an output terminal, said first input terminal coupled to said reference oscillator and said second input terminal coupled to said master oscillator for providing a series of bursts at the output thereof each one occurring during one of said predetermined number of time intervals, d. first means coupled to said master oscillator for dividing said frequency to provide a plurality of frequencies one of which is approximately equal to said horizontal synchronizing rate and one of which is equal to said vertical synchronizing rate, e. a combining circuit having one input coupled to the output of said coincidence circuit and another input coupled to said first means for providing said composite video signal and, f. second means for selectively coupling said combining circuit to said first means, said second means being responsive to one of said divided frequencies for applying the same to said combining means to cause a selected number of said bursts occurring during said predetermined intervals to be accurately indicated.

Claim 12

Test apparatus for a color receiver for providing a composite video signal including a predetermined number of time intervals and containing information including horizontal and vertical synchronizing components, and video components, which signal upon application to a color televisIon receiver causes a color bar pattern to be displayed on the face of a kinescope included therein, comprising, a. a master oscillator operating at a given first frequency, selected according to said predetermined number of time intervals, b. a reference oscillator operating at a frequency approximately equal to the color subcarrier reference frequency offset by said horizontal synchronizing rate, c. a coincidence circuit having first and second input terminals and an output terminal, said first input terminal coupled to said reference oscillator and said second input terminal coupled to said master oscillator for providing a series of bursts at the output thereof each one occurring during one of said predetermined number of time intervals, d. first means coupled to said master oscillator for dividing said frequency to provide a plurality of frequencies one of which is approximately equal to said horizontal synchronizing rate and one of which is equal to said vertical synchronizing rate, e. a combining circuit having one input coupled to the output of said coincidence circuit and another input coupled to said first means for providing said composite video signal and, f. second means for selectively coupling said combining circuit to said first means, said second means being responsive to one of said divided frequencies for applying the same to said combining means to cause a selected number of said bursts occurring during said predetermined intervals to be accurately indicated.