基于Duffing振荡器阵列的同频音频广播节目识别

The same frequency audio broadcast recognition based on Duffing oscillator array

为识别同频音频广播节目,提出在节目源间歇地添加确知的微弱正弦周期信号作为识别信息,Duffing振荡器阵列检测解调的音频信号中弱正弦周期信号并确定时隙内Duffing振子运动状态的跃变次数,以识别音频广播节目。使用16个音频进行仿真,从仿真结果可以看出,Duffing振荡器阵列检测到的李雅普诺夫指数值跃变次数与间歇加入的微弱正弦周期信号的次数一致;信噪比在46dB～52 dB之间,符合音频广播的信噪比要求,该识别方法可行。

For the identification of the same frequency audio broadcasting programs , the program source intermittently adding weak sinusoidal periodic signal known as identification information , detect the demodulation audio signal using Duffing oscillator ar-ray known weak sinusoidal periodic signal and determines a time slot Duffing oscillator motion state transition times , thereby identi-fying audio broadcast . using 16 audio by simulation . Simulation results show the Duffing oscillator array detected Lyapunov exponent value of weak sinusoidal periodic signal jump times and intermittent addition of the times; signal-to-noise ratio between 46 dB and 52 dB , in accordance with the SNR required audio broadcasting . It proves that the recognition method is feasible .