R&D Report 1964-65 : Field-store converter using ultrasonic delays as the storage medium W. Wharton, E.R. Rout, R.E. Davies
In this report, the conversion of television pictures between standards having different field frequencies is discussed and a method is proposed whereby a standards converter capable of conversion between the British 625-line/50 fields and American 525-line/60 fields standards could be realised by the use of ultrasonic delays. Such a standards converter would have a performance superior to that of the cathode-ray tube/camera combination at present used for conversion between the British and American standards.