PStamler wrote:
I smell a troll.
I think maybe not, based on Randy's previous postings. I think he's a
knowledgeable cat in the digital domain, has a basic understanding of
analog audio concepts, but isn't getting his head around this particular
question, now answered for him many times.
I think the answer is one he was not expecting, and like many engineers
who are appreciably rational, the irrational aspect of an audio metering
system in which the measured level increments need bear no specific
relationship to the corresponding analog signal levels is disturbing to
him.
When somebody asks a question and gets the precise answer from several
people at once, and keeps on arguing that nobody has given him the
answer, then a troll should be suspected.
I do understand that part of it, but unless someone has hijacked his
account I think he's just not getting it, and he might think we're
screwing around with him. All responses I have seen here have been well
intentioned.
0dBFS is the level at which one or the other extremes of a digital
waveform is at maximum codeable level.
Therefrom, the answer to his question can only be stated in absolute
terms when we know how many bits a given converter uses to convert an
analog signal of a particular level.
There are no established
standards relating that to any standards in the analog world, be they
dBu, dBV, dBm or any other. There are some informal standards in the
movie and broadcast world, but no standards body such as IEC or AES
has adopted an official standard.
And Randy, before you tell me "I don't want to know what isn't, I want
to know what is," what I've written above is what is (a definition of
dBFS), and there really ain't no more, and until a standards committee
gets together and votes out a standard, there won't be.
Peace,
Paul
--
shut up and play your guitar *
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