System for transmitting a narrow-band line and for simultaneous reproduction of such signal

Claim 1

In a system for transmitting and reproducing a narrow-band color television signal whose color information is contained in three color component signals each containing information relating to a respective one of three primary colors, the improvement comprising, in combination: a. signal generating means for producing the three color component signals simultaneously; b. first switch means connected to said signal generating means and having an output, said switch means being constructed and operated for delivering only one component signal at a time to said output and for switching cyclically from one component signal to the next at the picture line scanning rate, whereby there appears at said output a signal train composed of segments derived from each of said component signals in succession, each segment having a duration equal to one picture line scanning period; c. a transmission path having one end connected to said first switch means output; d. a first delay line having its input connected to the other end of said transmission path, and a second delay line having its input connected to the output of said first delay line, each said delay line producing a signal delay equal to one picture line scanning period; e. second switch means having first, second and third inputs and first, second and third outputs, said first input being connected directly to said other end of said transmission path, said second input being connected directly to the output of said first delay line, and said third input being connected directly to the output of said second delay line; f. means connected to said switch means for cyclically connecting each said output of said switch means to each of its said inputs in succession, each said output being switched from one input to the next at a rate equal to the picture line scanning frequency, and for establishing a phase difference between the switching cycles of said outputs such that at any given instant each said output is connected to a respectively different one of said inputs, whereby each said output receives only a different respective one of said color component signals and said three outputs of said switch means provide, during each line scanning period, portions of each of said color signals components; and g. means connected in said system for adding a luminance signal to each said color component signal segment applied to said first switch means, each said color component signal segment and its associated luminance signal occupying substantially mutually exclusive frequency bands.