LESSON 1
DESCRIBE BASIC OPERATION OF HELICAL SCAN VIDEOTAPE RECORDERS
TASK
Describe the principles of helical scan videotape recorders.
CONDITIONS
Given information and illustrations about theory,
terminology
and
principles,
relating to helical scan videotape recorders.
STANDARDS
Demonstrate competency of the task skills and knowledge by correctly responding to
85% of the multiple-choice test covering theory terminology and principles of
helical scan videotape recorder.
REFERENCES
None
Learning Event 1:
DESCRIBE THE PURPOSE AND USE OF THE SINGLE HEAD MACHINE
1.
General information of helican scan videotape recorders.
In recent years,
video tape has become an increasingly important part of many television systems.
Low cost and simplified operations are two of the main reasons for the great
success of the helical scan video tape recorder.
a. Terminology and requirement standards relative to helical scan equipment
have been up to the discretion of the purchaser and manufacturer for some years.
The initial standard for quality television recordings was the quadruplex
recorder/producer designed for studio use.
b. The quadruplex equipment, developed by various manufacturers, tend to be
compatible. However, this compatibility has not been a feature among helical scan
equipment manufacturers.
Manufacturers chose drum speeds, longitudinal tape
speeds, and tape widths that suited their own purpose. This meant that the helix
angle varied between recorders. A tape recorded on one machine could not be played
back on another.
Recently, Japanese manufacturers have established a common
standard, based on the Electronic Image Access (EIA) type VTR tape pattern.
1
Previous Page
