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LipTrev t1_ixz2p9a wrote

Reply to comment by brock_lee in TIL about the National Institute of Standards and Technology (NIST) - a US government agency maintaining a reference catalogue of almost any item known; from peanut butter to New Jersey waste water samples. And everything is for sale. by samgarita

> Got some cool stories about things like color TV. The first specs brought to the government would have rendered B/W TVs useless, and they said "go back and make black and white, and color TVs work on the same frequencies, it can be done.

B&W TVs being able to use the color signal, and later mono TVs being able to use the stereo signal was always such a cool bit of engineering.

I love that the audio method especially: an L+R signal and then an L-R signal that the stereo TVs use to create L and R signals through addition for L and inversion and then addition for R.

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