Conversion of color television signals to or from

专利名称：Conversion of color television signals to or

from interlaced form

发明人：John Philip Chambers,Derek Thomas Wright申请号：US05/611673申请日：19750909公开号：US04012772A公开日：19770315

摘要：Sequential/interlace scan conversion of NTSC or PAL color television signals iseffected by an encoder the output of which is connected to the input of scan conversionapparatus. Controllable phase shift means is included in either the color signal input orthe subcarrier input of the encoder and is adapted to vary the phase of the modulatedsubcarrier for each line of the received color signal by an essentially integral number ofquarter cycles in dependence upon the line number. The control is such that the

conversion apparatus provides an encoded output signal with the color subcarrier in PALor NTSC format. The invention can also be used in converting between different types ofinterlace systems.

申请人：THE MARCONI COMPANY LIMITED

代理机构：Kemon, Palmer & Estabrook

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