# Digtizing sound

Objective

Digitize sound signals from a microphone, and measure its frequency. Use the Piezo buzzer or any other source of sound like a tuning fork.

Procedure

- Enable A1 and MIC , with analysis

- Position the buzzer facing the microphone

- Set WG to 1000Hz, change it and watch the MIC output

- Use a whistle instead of the buzzer and find out the frequency of MIC output.

Discussion

The driving signal and the microphone output is shown in figure

Sound waves create pressure variations in the medium through which it travel. The microphone generates a voltage proportional to the pressure. The voltage variations are in tune with the pressure variations. You can consider the microphone as a pressure sensor, but working only for time varying pressures.