Automatic frequency response correction using color burst

A television signal processor comprising:

• means for receiving a color television signal including a stabilized picture carrier and a color burst signal;
• bandpass means exhibiting a substantially flat frequency response over the IF band of said color television signal;
• means for detecting the difference between the amplitude of said color burst signal and a reference signal that is based upon the peak detected voltage of a nominal color burst in a standard color television signal;
• and
• means, responsive to said detected difference, for adjusting said bandpass means to tilt its frequency response, said means for adjusting comprising a differential amplifier having a pair of tuned circuits, each tuned to a frequency near opposite ends of the IF band.

A television signal processor including a tilt correction circuit for maintaining a flat overall frequency response at picture carrier and color carrier frequencies comprising:

• means for developing a voltage by detecting said color burst;
• means for comparing said voltage with a reference voltage and for producing a correction voltage representative of the comparison;
• differential amplifier means including a first tuned circuit tuned to a frequency near the picture carrier frequency and a second tuned circuit tuned to a frequency near the color carrier frequency;
• means for supplying said color television signal to one input of said differential amplifier means;
• means for supplying said correction voltage to the other input of said differential amplifier means whereby the relative effects of said tuned circuits are varied for compensating the frequency response of said differential amplifier means.