By Topic

Measurements of the Subjective Effects of Interference in Television Reception

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

1 Author(s)
Charles E. Dean ; Hazeltine Research Corp., Little Neck, N.Y.

A measurement program was conducted in which almost 200 observers made about 38,000 rating observations on color and monochrome stationary television pictures impaired by various known amounts of interference. Separate tests were made for the following types of interference: upper adjacent channel, lower adjacent channel, random noise, co-channel with each of six carrierfrequency separations, and simultaneous random noise and cochannel. Six rating grades were used as follows: 1) Excellent, 2) Fine, 3) Passable, 4) Marginal, 5) Inferior, and 6) Unusable. The observations were handled on a statistical cumulative frequency basis and plotted on probability paper. Commercial monochrome and color receivers were used, and the tests were made with laboratory signal-generating equipment on the lower VHF television channels. As representative results, a picture impaired by upper-adjacentchannel intereference (with 6-mc channels) was rated by 50 per cent of the observers as Passable or better for -27-db ratio of signal to interference. For the lower adjacent case a similar value was found, this result being explained as due to better traps in the medium-high-grade receivers of the test than in many receivers in use by the public. For random-noise interference the requirement for Passable or better rating by 50 per cent of the observers was +27 db on the basis of RMS sync amplitude to RMS noise over the 6-mc channel.

Published in:

Proceedings of the IRE  (Volume:48 ,  Issue: 6 )