一、引言 在很多噪声环境下,虽然噪声的波形是周期性重复的,但往往不可能在噪声声源处将噪声抵消。在这种情况下,为了对噪声场中的个人进行防护,可以采用同步自适应噪声抵消技术来作为对常规无源噪控技术的补充。它的主要优点是在抑制不需要的低频高声级噪声的同时,仍可听见语 I. Introduction In many noisy environments, although the waveform of the noise is periodically repeated, it is often impossible to cancel the noise at the noise source. In this case, in order to defend the individual in the noise field, a synchronous adaptive noise cancellation technique may be used as a supplement to conventional passive noise control techniques. Its main advantage is that while suppressing unwanted low-frequency, high-level noise, it is still audible