Noise Figure And The System Signal To Noise Ratio (1967)

By Carmine D'Elio, Vikoa, Inc.

Everyone is well aware of the fact, that noise in an amplifier or .system, serves to degrade the information of the desired signal. In a cable system it sets the limit on the minimum signal that can be transmitted along the cable and still provide a good quality picture. In order to describe the quality of the picture in a more concise manner, we establish a relationship between the signal and the noise, namely the signal to noise ratio. Since noise fluctuates randomly over a period of time, it would be meaningless to try to relate an instantaneous signal voltage to instantaneous noise voltage. Instead, we deal with averages over a long period of time and use the mean squared signal voltage and mean squared noise voltage. The ratio of these two voltages is then referred to, as the signal to noise ratio. Since the signal and the noise are measured at the same point in a system and therefore appear across the same load, the ratio of mean squared voltages is also the ratio of powers and thus represents the signal to noise power ratio. Using this relation the quality of a T.V. picture can now be described with a number and the performance of a system with respect to noise, can be rated by the signal to noise ratio.

By clicking the "Download Paper" button, you are agreeing to our terms and conditions.

Similar Papers

Noise Figure And The System Signal To Noise Ratio
By Carmine D'Elio, Vikoa, Inc.
1967
Standard Methods For Calculation Of Carrier To Noise Ratio In Modern CATV Equipment
By Lamar West, Scientific-Atlanta, Inc.
1985
The Relationship Between The NCTA, EIA, And CCIR Definitions Of Signal-To-Noise Ratio
By T. M. Straus, Theta-Com of California
1974
Noise Figure Measurements On Distribution Systems
By Donald E. Groff, General Instrument Jerrold Division
1984
Testing Video Signal To Noise Ratio Using A Modified Staircase Waveform
By Robert c. Tenten, Home Box Office
1977
In-Service Noise Measurements On A CATV System
By Charles W. Rhodes, Tektronix, Inc.
1971
Noise Power Ratio the Analytical Way
By Robert L. Howald, Michael Aviles Motorola Broadband Communications Sector
2000
Noise Measurements For A CATV System-C/N,S/N,phase Noise
By Wen Tsung Lin and Tim Homiller, Jerrold - Applied Media Lab
1989
The Key Aspects Of Signal-To-Noise In Television Viewing.
By John E.D. Ball and R. Evans Wetmore, Public Broadcasting Service
1973
Oscillator Phase Noise And Its Effects In A CATV System
By Rezin Pidgeon, Principal Engineer, Scientific-Atlanta Dan Pike, VP Engineering, Prime Cable
1988
More Results >>