英国近年来一直在研究一种有源噪声控制法。这种方法是利用麦克风探测到噪声源后,马上发出与之对应的反相波。90年代初,科学家已研究出复杂的电子控制机械,并将其试用于BA748飞机中,结果使噪声的衰减较为明显,目前已有多家航空公司计划采用这种降低噪声的装置。对于街头、闹市区的噪声,已有 In recent years, Britain has been studying an active noise control method. This method is to use the microphone to detect the noise source, the immediately issued corresponding to the reverse wave. In the early 1990s, scientists have developed complex electronic control machinery and tried it on the BA748 aircraft, resulting in a noticeable reduction in noise. Several airlines now plan to use this noise-reducing device. For street, downtown noise, already