Audio measurements typically include basic parameters such as signal voltage, frequency, signal-to-noise ratio, and harmonic distortion. Most audio parameters can be composed of these basic parameters.
Voltage test can be divided into RMS voltage, average voltage and peak voltage.
Frequency is one of the most basic parameters in audio measurement. The frequency of the signal is usually measured using a high frequency precision clock as a reference. When the frequency is measured, the input signal and the reference clock are counted at the same time for a limited time, and then the counted value of both is compared and the frequency of the reference clock is multiplied to obtain the signal frequency. As the operating speed of the microprocessor chip increases, the frequency of the signal can also be calculated by software using a fast Fourier transform.
Signal-to-noise ratio is the basic performance index of audio equipment, and is the ratio of the effective voltage of the signal to the noise voltage. In practical measurement, for convenience, the signal-to-noise ratio is usually calculated by using the total voltage of the signal with noise instead of the signal voltage.
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