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[11249.256922] usb 1-1.4: new full-speed USB device number 10 using dw
+c_otg
[11249.365032] usb 1-1.4: New USB device found, idVendor=0d8c, idProdu
+ct=0139
...
[11249.365130] usb 1-1.4: Manufacturer: C-Media Electronics Inc.
[11249.400778] input: C-Media Electronics Inc.       USB PnP Sound Dev
+ice as /devices/platform/soc/3f980000.usb/usb1/1-1/1-1.4/1-1.4:1.3/00
+03:0D8C:0139.0007/input/input6
[11249.457789] hid-generic 0003:0D8C:0139.0007: input,hidraw3: USB HID
+ v1.00 Device [C-Media Electronics Inc.       USB PnP Sound Device] o
+n usb-3f980000.usb-1.4/input3

#!/usr/bin/perl

...

close($fh);

root@node:/srv/perl# ./dba.pl
Calculated dB(A): 87.9548395267721
...
Calculated dB(A): 87.9595239674196
Calculated dB(A): 87.9586213444603
Calculated dB(A): 87.9595239674196