Although the focus of this paper is on electrical power distribution and grounding, the impact of noise on the signal path is ultimately what we see or hear. When designing or troubleshooting audio & video systems it's important to have a basic understanding of how the electrical and grounding system can adversely impact the signal path.
This white paper is simply a high-level overview of signal-related topics including SCIN, CMRR and Pin 1 problems that are well covered by many authors and industry organizations.
An addendum to the white paper is also enclosed in the download.