A Digital Framestore Synchronizer

The problems of synchronizing the increasing number and variety of broadcast television sources to a local station reference are examined, and the conventional analog methods employed to obtain synchronization are noted. The digital framestore synchronizer provides the general solution today, although since their introduction in 1974, such synchronizers have not been readily accepted in the industry because of the cost, size, weight, and power consumption of the first production units. A synchronizer is described which can store a complete video frame and yet occupies only 8.75 in (22.2 cm) of panel height on a standard 19-in (48.5-cm) rack. The power consumption is less than 250 VA, and the weight is less than 60 lb (27.3 kg). The video input circuitry is designed to provide time-base correction of any helical-scan videotape recorder television signals and of most quadruplex VTR signals. The advantages of the framestore technique over field-store are discussed, and some applications for the synchronizer are considered.

Print ISSN

0036-1682

Published

1976-06

Content type

Original Research

DOI

10.5594/J06818