The color picture signal shall correspond to a luminance (brightness) component transmitted as amplitude modulation of the picture carrier and as a simultaneous pair of chrominance (coloring) components transmitted as the amplitude modulation sidebands of a pair of suppressed sub-carriers in quadrature having the common frequency relative to the picture carrier of +3.579545 [MHz] +/- 0.0003 per cent with a maximum rate of change not to exceed 1/10 cycle per sec per sec.