> Those of you who have used analog recording equipment may have just thought to yourselves, "My goodness! That sounds like tape hiss!" Well, it doesn't just sound like tape hiss, it acts like it, too. And if we use a Gaussian dither, then it's mathematically equivalent in every way. It _is_ tape hiss!
> Intuitively, that means we can measure tape hiss, and thus the noise floor of magnetic audio tape, in bits, instead of decibels, in order to put things in a digital perspective. Compact cassettes... (Monty holds up a tape, then glares at it and flips it over in his hand) ... for those of you who are old enough to remember them, could reach as deep as nine bits in perfect conditions, though five to six bits was more typical, especially if it was a recording made on a tape deck.
> That's right - Your mixtapes were only about six bits deep, if you were lucky. The very best professional open-reel tape used in studios could barely hit - any guesses? - 13 bits _with_ advanced noise reduction.
Digital Show & Tell from Monty at Xiph
> Those of you who have used analog recording equipment may have just thought to yourselves, "My goodness! That sounds like tape hiss!" Well, it doesn't just sound like tape hiss, it acts like it, too. And if we use a Gaussian dither, then it's mathematically equivalent in every way. It _is_ tape hiss!
> Intuitively, that means we can measure tape hiss, and thus the noise floor of magnetic audio tape, in bits, instead of decibels, in order to put things in a digital perspective. Compact cassettes... (Monty holds up a tape, then glares at it and flips it over in his hand) ... for those of you who are old enough to remember them, could reach as deep as nine bits in perfect conditions, though five to six bits was more typical, especially if it was a recording made on a tape deck.
> That's right - Your mixtapes were only about six bits deep, if you were lucky. The very best professional open-reel tape used in studios could barely hit - any guesses? - 13 bits _with_ advanced noise reduction.