SignalGenerator

This Python script generates and plays a waveform (sine or square) of a specified frequency, duration, and amplitude using the pyaudio and numpy libraries.

Requirements

• Python
• numpy
• pyaudio
• argparse

You can install these libraries using pip:

pip install numpy pyaudio argparse

Usage

python siggen.py [type] [-d DURATION] [-f FREQUENCY] [-a AMPLITUDE] 

Arguments

Positional arguments:

{sine,square,sweep}     output type of the signal

Options:

-h, --help              show this help message and exit

-v, --version           show program's version number and exit

-d DURATION, --duration DURATION

                        duration of waveform output in seconds

-f FREQUENCY, --frequency FREQUENCY

                        wave frequency in Hz

-a AMPLITUDE, --amplitude AMPLITUDE

                        wave amplitude from 0.0 to 1.0

-e END_FREQUENCY, --end-frequency END_FREQUENCY

                        (sweep mode only) final frequency value of sweep in Hz

-s STEP, --step STEP    (sweep mode only) step size of signal sweep

Defaults

Argument	Default Value
Type	sine
Duration	10.0
Frequency	440.0
Amplitude	0.5
End_Frequency	1440.0
Step	100

Examples

• Play a sine wave with default parameters (10 seconds, 440Hz, 0.5 amplitude):

python siggen.py

• Play a 5-second sine wave at 500 Hz with an amplitude of 0.7:

python siggen.py sine -d 5 -f 500 -a 0.7

• Play a 10-second square wave at the default frequency and amplitude:

python siggen.py square

• Play a frequency sweep from 440Hz to 1440Hz with steps of 100Hz:

python siggen.py sweep -f 440 -e 1440 -s 100

Description

The script uses numpy to generate the waveform samples and pyaudio to play the audio. It takes command-line arguments using the argparse module to customize the generated sound.

• Sine and Square waves: The script calculates the samples for the specified waveform type (sine or square) and then plays them through the system's audio output. The amplitude is applied to the generated samples before they are converted to bytes and sent to the audio stream.

• Sweep mode: The script generates a series of sine waves, incrementing the frequency from the starting frequency to the ending frequency with the specified step size. Each frequency is played for the specified duration.

Notes

• Ensure you have the necessary audio drivers installed for pyaudio to work correctly.
• The sampling rate is fixed at 44100 Hz.
• The script uses a float32 sample format.
• Signal output is dependent on system sink volume.
• The sweep mode only generates sine waves.
• Signal output is dependent on system sink volume which can be set using the following command

 pactl -- set-sink-volume 0 100%

Contact

Sid Chaudhary - contact.sid.chaudhary@gmail.com