Nonintrusive speech level and dynamic noise measurements
First Claim
1. Apparatus for measuring the level of noise signals when they are present on a transmission path comprisingmeans for determining individual average power levels for respective succeeding groups of said noise signals present within a predetermined period of time on said path and for determining an average power level for said groups as a function of said individual average power levels,means for storing in a memory the average power level for said groups as well as average power levels determined for respective other ones of said groups, andmeans, operative when a predetermined number of such average power levels have been stored in said memory, for outputting as the noise level of said transmission path the median value of said stored average power levels.
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Accused Products
Abstract
A digital signal processor is provided with the facility to measure accurately, and nonintrusively, the levels of noise and/or speech signals appearing on an in-service network connection.
53 Citations
21 Claims
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1. Apparatus for measuring the level of noise signals when they are present on a transmission path comprising
means for determining individual average power levels for respective succeeding groups of said noise signals present within a predetermined period of time on said path and for determining an average power level for said groups as a function of said individual average power levels, means for storing in a memory the average power level for said groups as well as average power levels determined for respective other ones of said groups, and means, operative when a predetermined number of such average power levels have been stored in said memory, for outputting as the noise level of said transmission path the median value of said stored average power levels.
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8. Apparatus for measuring the level of noise signals on an in-service transmission path comprising
means for receiving the levels of respective ones of said noise signals as they appear in succession within a predetermined period of time on said transmission path, means for forming said levels into respective groups of levels as said levels are received and for generating an average power level for each of said groups, means for accumulating each said average power level that is generated within a predetermined period of time and for generating an average power level for said accumulation, and means, operative when a predetermined number of average power levels have been generated for a like number of such accumulations, for outputting to an output terminal a value representing the median of said predetermined number of average power levels.
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15. Apparatus for measuring the level of noise signals when they are present on a transmission path comprising
means for accumulating the levels of said noise signals for each of a succession of windows, each of said windows representing a predetermined period of time, means, responsive to the presence of a speech signal on said transmission path during a current one of said windows, for discarding the associated accumulation, and means for generating a value as a function of the accumulation obtained for each of said windows and for outputting said value to an output terminal as the level of noise signals present on said transmission path.
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20. A method of for measuring the level of noise signals when they are present on a transmission path comprising
accumulating the levels of said noise signals for each of a succession of windows, each of said windows representing a predetermined period of time, responding to the presence of a speech signal on said transmission path during a current one of said windows by discarding the associated accumulation, and generating a value as a function of the accumulation obtained for each of said windows and then outputting said value to an output terminal as the level of noise signals present on said transmission path.
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21. A method for measuring the level of noise signals when they are present on a transmission path, said method comprising the steps of
determining individual average power levels for respective succeeding groups of said noise signals occurring within a predetermined period of time and determining an average power level for said groups as a function of said individual average power levels, storing in a memory the average power level for said groups as well as average power levels determined for respective other ones of said groups, and when a predetermined number of such average power levels have been stored in said memory, then outputting as the noise level of said transmission path the median value of said stored average power levels.
Specification