ApplicationNo. 06/047188 filed on 06/08/1979
US Classes:348/470, Adapted to reduce noise or for frequency modulation (e.g., variable gain)348/481, Plural (e.g., stereo or SAP)380/236, Modifying accompanying audio signal380/240Including addressed decoder control signal
ExaminersPrimary: Murray, Richard
Attorney, Agent or Firm
International ClassesH04N 7/167 (20060101)
H04N 7/084 (20060101)
AbstractThe blacker-than-black sync pulse of a standard video signal is replaced by a gray scale sync to increase picture signal, permit audio multiplexing and allow security phase inversion by means of encoder and decoder circuitry including a sync stripper, gate and timing generator, audio processor, phase code generator, color reference regenerator, blank and summing amplifier, and phase reversal amplifier.