In proteus one can use actual audio signal from audio wav file or use microphone input from PC.
One way to use real audio signal in Proteus is to use the Audio generator input probe as shown.
The audio file in .wav format can be imported and set as follows;
Following shows the audio signal on oscilloscope.
To determine the amplitude of the signal shown in the Proteus digital oscilloscope, we need to look at the Volts per Division (V/Div) setting for the active channel and count the vertical divisions on the grid.
1. Identify the Channel Settings
Looking at the control panel on the right:
Active Channel: The yellow trace corresponds to Channel A.
Vertical Scale: The dial for Channel A is set to 50mV per division (as indicated in the digital readout below the knob).
Position: The vertical position for Channel A is set to 0, meaning the center horizontal line of the grid is the zero-volt reference (ground).
2. Measure the Divisions
Looking at the waveform on the grid:
Positive Peak: The highest peaks of the signal reach approximately 2.5 divisions above the center line.
Negative Peak: The lowest peaks reach approximately 2.5 divisions below the center line.
3. Calculate the Amplitude
Amplitude is generally measured as the Peak Voltage ($V_p$), which is the maximum displacement from the zero-volt reference.
Summary of Values
Peak Amplitude ($V_p$): Approximately 125mV.
Peak-to-Peak Amplitude ($V_{pp}$): This is the total vertical height from the very bottom to the very top (roughly 5 divisions).
$5 \text{ div} \times 50\text{ mV} = \mathbf{250\text{mV}}$.
Since audio signals are complex and non-sinusoidal, these values represent the instantaneous peak seen in this specific capture.
Another way to use real audio signal in Proteus is to use PC microphone.
The audio signal waveform on oscilloscope is shown below.
For a complex, non-symmetrical audio burst like this, we look at the maximum peak voltage ($V_p$) and the total peak-to-peak voltage ($V_{pp}$).
Peak Amplitude ($V_p$):
$$3 \text{ divisions} \times 0.2\text{ V/div} = \mathbf{0.6\text{V}} \text{ (or 600mV)}$$Peak-to-Peak Amplitude ($V_{pp}$):
The total vertical span is roughly 5 divisions (3 up, 2 down).
$$5 \text{ divisions} \times 0.2\text{ V/div} = \mathbf{1.0\text{V}}$$
See the video demonstration below:
