K-Decible Noise Guarded Receiver
Original Publication Date: 1980-Jan-01
Included in the Prior Art Database: 2005-Feb-12
When a signal is received on a tie-line in a telephony system, it is useful to compare the level of the data signal S(f) for a frequency f with the noise level N in order to accept the received signal only if the data signal-to-noise ratio is greater than a constant guard value of K decibels, whatever the level of signal S(f) may be. This is achieved by reducing by K decibels the amplitude of the data signal before comparing it with the amplitude of the noise.