Patent ID: 8160276
Filing Date: 2012-04-17
Classification: H04B

Abstract:
1. An audio system integrated with ultrasound/quasi-ultrasound communication functionality, comprising: a first device, comprising a first signal processor and an acoustic transmitter, the first signal processor capable of transferring a communication signal to a corresponding baseband signal such that transitions in the communication signal are transferred to smoother transitions in the baseband signal, and modulating the communication signal to an ultrasound/quasi-ultrasound according to the baseband signal, the acoustic transmitter capable of transmitting the ultrasound/quasi-ultrasound and an audio sound, wherein a frequency of the ultrasound/quasi-ultrasound is higher than a frequency of the audio sound; and a second device, comprising an acoustic receiver and a second signal processor, the acoustic receiver capable of receiving the audio sound and the ultrasound/quasi-ultrasound, and the second signal processor capable of demodulating the ultrasound/quasi-ultrasound to retrieve the communication signal.