录音资料中单频交流声压制的研究

Study on Single Frequency AC Noise Suppression in Audio Recordings

音频设备电源滤波不良,或者前、后级放大电路电源端的退耦电容虚焊、失效,都会产生低频交流声。在历史录音资料中,如果要清除此类单频交流噪声,通常也会对附近的声音频率产生压制,造成音质的损伤。研究使用一种方法估算出单频交流声的特征值,然后根据波的叠加原理,滤除单频交流声噪音。最后通过软件编程和实际处理效果验证了方法的有效性。

Filtering bad of audio equipment power,virtual welding or failure of before and after stage amplifier circuit power of the decoupled capacitance,can produce low-frequency hum.The pressing of nearby voice frequency can cause damage to the sound quality When this kind of single frequency AC noise is cleared in the historical recording material.We use a method to calculate the eigenvalues of single frequency AC sound and then clear the single frequency AC noise based on wave superposition principle.Final adoption of the software programing and the actual results verify the effectiveness of this method.