Quick Response Code (QR) is a 2D bar code which provides a good way to access websites more quickly than by manually entering the URL. However, scanning a QR code label requires specific conditions such as squarely aiming the device and evenly lit environment. That’s why we developed an acoustic data transmission system that enables a short-range wireless communication between the loudspeaker and microphone.
Data embedding in the audio signal is done by modifying the phase of the signal's modulated complex lapped transform (MCLT) coefficients, while the perceived quality of the embedded audio signal remains the same as that of the original audio signal. A transmitter broadcasts the data through the air by playing back the embedded audio using a classic loudspeaker. The cellular phone picks up the sound signal, extracts the data in real-time and finally jumps to the website.