Frequency Generator

freqGen Generate different types of sound waves through the default speaker of Linux system using Advanced Linux Sound Architecture (ALSA).

• Generate sound waves in different types ( Sine , Square, Triangualr, Sawtooth).
• Adjust Frequency, Phase , Volume, and the Wave type of each channel independently.

Build

gcc -o freqGen freqGen.c -lm -lpthread -lasound

Usage

./freqGen [options]

-r      sample rate (Hz)
-l      buffer time uSec (latency)
-f      channel 1 freqency (Left)
-F      channel 2 frequency (Right)
-v      channel 1 volume (Left)
-V      channel 2 volume (Right)
-h      help message

How to use

Sound Wave Type

To change the wave type for channels press :

Wave Type	Left chn	Right chn
Sine	1	0
Square	2	9
Triangular	3	8
Sawtooth	4	7

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Frequency

There are two methods to change the frequency :

Immediate

• Press 'f' and enter the new frequency for channel 1 (Left).
• Press 'F' and enter the new frequency for channel 2 (Right).

Relative

Freqency	Left chn	Right chn	Both chns
+	U	O	I
-	J	L	K

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Wave Phase

There are two methods to change the wave phase :

Immediate

- Press 'p' and enter the new wave phase for channel 1 (Left).
- Press 'P' and enter the new wave phase for channel 2 (Right).

Relative

Wave Phase	Left chn	Right chn
+	G	H
-	B	N

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Volume

There are two methods to change the volume :

Immediate

- Press 'v' and enter the new volume for channel 1 (Left).
- Press 'V' and enter the new volume for channel 2 (Right).

Relative

Volume	Left chn	Right chn	Both chns
+	A	F	S
-	Z	C	X

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Exit

Press 'q' to exit from the program.