I don't think the phrase "[[Signal to Noise Ratio]]" really applies to the concept of [[Overhead]], generally speaking. However something about the two concepts *feel* related. It's a focus on amount of value-having "stuff" compared to the amount of non-value-having "stuff" in a [[What is a System|system]].
A [[CSV]] file is almost all signal, meanwhile an [[Excel]] ".xlsx" file has a lot of overhead it in, and thus a lower SNR when considering bytes-stored on your computer.
Of course, philosophically speaking[^1], this depends on the definition of "signal". If it's "bytes representing data" then the CSV clearly wins. If, instead, signal is "how clearly the data are presented", perhaps an [[Spreadsheet|Excel]] file with notes clarifying things like [[Data Types]] that remove potential [[Ambiguity]] could be considered a higher signal-to-noise ratio. It's all about application, I suppose.
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[^1]: I guess?