High scanning rate to standard scanning rate television signal converter with smooth moving edge conversion

Claim 1

Apparatus for converting a high speed television signal to a reference scanning frequency, said reference scanning frequency defining reference odd and even field intervals, said high speed television signal including odd and even fields and having a scanning frequency N times greater than said reference scanning frequency, where N is an odd integer, comprising: first memory means for storing a first plurality of consecutive odd fields of said high speed television signal in accordance with first write signals and for reading out the stored first plurality of odd fields in accordance with a first read signal; second memory means for storing a second plurality of consecutive even fields of said high speed television signal in accordance with second write signals and for reading out the stored second plurality of even fields in accordance with a second read signal; means for producing a mean odd field by obtaining an arithmetical mean of said stored first plurality of odd fields and for producing a mean even field by obtaining an arithmetical mean of said stored second plurality of even fields; and control means for generating said first write signals and said second read signal during the reference even field interval to omit storage of even fields of said high speed television signal during said reference even field interval, and for generating said second write signals and said first read signal during the reference odd field interval to omit storage of odd fields of said high speed television signal during said reference odd field interval.