What Is Audio Measurement?

- May 24, 2018-

During the test, a single sine wave frequency with known harmonic purity passes through the test device and enters the distortion measuring instrument. Based on the reference measurement level, the instrument calculates the frequency used for the test and then passes the residual signal through a set of band limiting filters that are adjusted according to the bandwidth (usually 20 Hz-20 kHz).

The last thing left is noise, which includes the humming or disturbing sounds of the AC power cords, and all the harmonic distortion produced by the device.

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