Originally Posted By: Guitarhacker


The problem comes in when you record an audio track such as a guitar amp with a certain amount of hum. That hum is boosted, as you said, relative to the track,...


The Audio Engineer wouldn't classify that as noise in the sense of Signal to Noise Ratio.

Anything actually recorded by the mic would not fall into the Noise category, it is Signal at that point.

The kind of Noise we reference when speaking of Signal to Noise Ratio is the Thermal Noise of circuitry in preamps, processing and A to D circuitry.

Such should indeed be minimal in the well designed equipments.

Noise such as the hum from a guitar amp should really be tackled at the source, which is the amp, pickups, location of same, etc. Vary common for single coil pups in proximity to computer monitors to pick up and amplify the scan rates and switching power of those things. Sometimes the home recordist can greatly reduce that kind of buzz by merely turning the guitar's orientation 90 degrees from the loudest pickup point as regards the monitor. Sometimes more distance away from the source of the noise is what has to happen. In rarer cases, it may be a technical or electrical problem with the particular amp or guitar and this can often be corrected.


--Mac

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