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Comment by bondarchuk | Hacker News Reader

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bondarchuk·

>Edit: according to gemini AI:

>* Type I had a dynamic range of about 50bB (roughly 8 bits)

>* High quality tape with Dolby B, C and dbx yielded roughly 65, 75, and 85dB SNR (about 11, 12.5, and 14 bits)

>So you could get pretty close to CD quality, but not quite.

Source? AI content without it is less than worthless.

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Did you actually try any searches? Or is this just an excuse to broadcast your feelings about AI?

The author of the Ogg format claims a bit more pessimistic range of bit depth: https://www.youtube.com/watch?v=cIQ9IXSUzuM

Here are some measurements of type I, II and IV:

http://www.ant-audio.co.uk/Tape_Recording/Measurements/HD3_v...

Here are the specifications of a typical dbx unit: https://www.hifiengine.com/manual_library/dbx/222.shtml

The measurements you are linking to are showing the level of distortion (HD3 v level) not dynamic range! The Y-axis on the graphs is showing the 3rd harmonic in dB in relation to the mV given in on the x-axis. This has absolutely nothing to do with dynamic range and it is also not the signal-to-noise-ratio. The fundamental frequency in those measurements was at 315 Hz. HD3 refers to Harmonic Distortion at 3rd level.

My bad. This Wikipedia article has a table of SNR values for 13 different kinds of tape: https://en.wikipedia.org/wiki/Compact_Cassette_tape_types_an...

It's just annoying to post unverifiable numbers without a credible source and expect others to do the hard work of verifying it (or just take you at face value, probably). It has nothing to do with AI except insofar as your own feelings on AI convinced you this is a reasonable method of communication.

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