Patent ID: 9544442
Date: 2017-01-10
CPC Classifications: H04L,H04M

Claim:
1. A method, comprising: receiving, at an electroacoustic transducer of a first electronic device, a data encoded audio signal that includes modulated digital data therein; demodulating the data encoded audio signal to produce frequency signals including a target frequency and a lingering effect of a previously received data encoded audio signal; selecting a set of one or more frequencies in the frequency signals with amplitudes above a predetermined threshold to produce a present input signal; computing an intersection value representing the intersection of the present input signal with a previous input signal, the previous input signal generated from the previously received data encoded audio signal by selecting a set of one or more frequencies with amplitudes above the predetermined threshold from frequency signals demodulated from the previously received data encoded audio signal; calculating, using the intersection value, a difference value; and based on the difference value, selecting either a previous output signal generated from the previously received data encoded audio signal or the difference value as the present output signal.