Study on Single Frequency AC Noise Suppression in Audio Recordings
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.
single frequency AC noisefast Fourier transformleast-square methodnormalized cross-correlationQt
NETL
NSTL
万方数据
维普
