1. the use of cross correlation method by a signal comparison 2. find the area under the graph of a linear Moving Average, and 3. the analysis of audio signals by means of the frequency values: Max.
1. The method compares the signal cross correlation 2. Find the area under the line 3. Moving Average and analyze audio signals using a frequency value at the maximum.
1. Use a comparison signal by way of cross correlation 2. Find the area under the graph of the line and Moving Average 3. Analyze the signal noise, the frequency meter peak.