Scratch Filter

Scratch Filter A control on an audio preamplifier that serves to reduce the noise on an analog disc containing scratches or other surface defects. Scratch filters are rarely found on modern, consumer-grade equipment, because digital-audio software does not react to scratches the way analog systems do. However, there are now available computer systems that can nearly eliminate scratch sounds from analog recordings, allowing rare and valuable performances on such discs to be fairly cleanly…