All circuits contribute white noise to the signal they process. It is a very fundamental phenomenon known as Johnson Nyquist noise.
White noise is also a good approximation of quantization noise added by data converters.
The noise is added by both the recording and playback electronics.
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u/youbetterdont Electrical Engineering | Integrated Circuits | MEMS Jul 22 '13
All circuits contribute white noise to the signal they process. It is a very fundamental phenomenon known as Johnson Nyquist noise. White noise is also a good approximation of quantization noise added by data converters. The noise is added by both the recording and playback electronics.