Many soundcard based instruments have been successfully
developed such as Virtual Oscilloscope [2], the
potentiometric sensor [3], noise testing system [9], PWM
motor controller [4] and an interface for transducer signals
[5]. Moreover, transfer of text documents through soundcard
have been thoroughly studied [7]. Thorough study of
measurement of frequency has also been made [10]. It has
also been used to develop VI’s for educational purposes [6].