Method and apparatus for evaluating noise level on a telephone channel
First Claim
1. A method of evaluating a noise level on a telephone channel on the basis of a signal present on the channel during successive time intervals of substantially equal duration, the method comprising the steps of:
- assigning the noise level on said channel to a given "noise level" range made up of a limited defined set of discrete level values;
observing successive signal level values present on the channel and selecting those observed values which lie in said noise level range; and
keeping records of different selected signal level values expressed in terms of said discrete values to take as being representative of the noise level on the channel that one of the discrete values on which the majority of the selected signal level values are concentrated.
1 Assignment
0 Petitions
Accused Products
Abstract
The level of the signal present on the telephone channel is evaluated at successive time intervals. Those evaluated signal levels which lie within a given range of noise levels are selected and they are expressed in terms of r discrete values in said range. A count is maintained for each of said discrete values indicative of the frequency with which it is selected in comparison with the frequency with which the other discrete values are selected. The discrete value having the highest count, i.e. the most frequently selected discrete value, is considered to be indicative of the level of noise on the telephone channel in question.
37 Citations
15 Claims
-
1. A method of evaluating a noise level on a telephone channel on the basis of a signal present on the channel during successive time intervals of substantially equal duration, the method comprising the steps of:
-
assigning the noise level on said channel to a given "noise level" range made up of a limited defined set of discrete level values; observing successive signal level values present on the channel and selecting those observed values which lie in said noise level range; and keeping records of different selected signal level values expressed in terms of said discrete values to take as being representative of the noise level on the channel that one of the discrete values on which the majority of the selected signal level values are concentrated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
Specification