Digital and pictorial photographic electronic recorder
R. G. Mcpherson, I. A. Sonderby · Transactions of the American Institute of Electrical Engineers Part I Communication and Electronics · 1958
A film data-recording system is described which combines the advantages of pictorial and digital recording. This combination of photographic and digital techniques provides a record containing a picture of the event of interest with the adjacent frame used to record a digital code, which may be used to provide a record of instrumentation, time, or other identifying information.