Ambient Signal Identification

A method for identifying ambient signal data in a test signal data set, the method comprising:

• identifying a cumulative amplitude distribution of data elements in the test signal data set wherein the data elements are in order by amplitude values, wherein the data elements comprise frequency values and corresponding amplitude values;
• identifying a subset of data elements from the test signal data set, wherein the subset of data elements comprises the data elements with the amplitude values greater than a mean of the amplitude values of the data elements in the test signal data set;
• and
• identifying the data elements in the subset of data elements wherein a difference between the amplitude values of adjacent data elements in the cumulative amplitude distribution of data elements is greater than a standard deviation of the amplitude values of the data elements in the subset of data elements.

An apparatus comprising:

• an ambient signal identifier configured to:
• identify a cumulative amplitude distribution of data elements in a test signal data set wherein the data elements are in order by amplitude values, wherein the data elements comprise frequency values and corresponding amplitude values;
• identify a subset of data elements from the test signal data set, wherein the subset of data elements comprises the data elements with the amplitude values greater than a first threshold value;
• and
• identify the data elements in the subset of data elements wherein a difference between the amplitude values of adjacent data elements in the cumulative amplitude distribution of data elements is greater than a second threshold value.