![\"\"](\"http:\/\/192.168.3.4\/wp-content\/uploads\/2017\/11\/44k_Mono.wav.png\")
<\/a><\/p>\nFirst, I’ll use this command to convert the audio wav file into a text based dat file.<\/p>\n
sox \"\/home\/local\/Desktop\/Export to Data\/44k_Mono.wav\" \"\/home\/local\/Desktop\/Export to Data\/44k_Mono.dat\"\r\n<\/pre>\nHere is a sample of first few lines of the resulting dat file.<\/p>\n
; Sample Rate 44100\r\n; Channels 1\r\n0 0\r\n2.2675737e-05 0\r\n4.5351474e-05 -3.0517578e-05\r\n6.8027211e-05 0\r\n9.0702948e-05 0\r\n0.00011337868 0\r\n<\/pre>\nThe first two lines contain the sample rate and number of channels in the audio. The remaining lines contain two columns of data, the first is timestamp and the next is the audio level at that point in time. The example above uses 44100 samples per second, so each row increments in time by 22.6 microseconds.<\/p>\n
For our purposes, we are only interested in the second row. So we’ll need to remove the first 2 rows and the first column from the dat file.<\/p>\n
Now open up GNUPlot by entering “gnuplot” at the terminal. From here enter in the following command to create a simple plot with the resulting audio data.<\/p>\n
set output \"\/home\/local\/Desktop\/Export to Data\/44k_Mono.png\"\r\nset terminal pngcairo background rgb 'black'\r\nset xlabel 'Time' tc rgb 'white'\r\nset ylabel 'Amplitude' tc rgb 'white'\r\nplot \"\/home\/local\/Desktop\/Export to Data\/44k_Mono.txt\" with lines linecolor rgb \"green\"\r\n<\/pre>\n