When evaluating noise introduced by cable television converters, terms such as carrier-to-noise ratio, signal-to-noise ratio, and noise figure are commonly used. These terms are measures of noise performance. The ability to use these terms interchangeably has become increasingly important with the advent of baseband converters. Baseband converters have precluded the use of traditionally used noise figure equipment which is widely used for evaluating RF converters. Therefore, a complete understanding of noise terms is essential. This paper will identify the differences between the commonly used noise terms along with the derivation of the conversion factors.