Peter Jay Salzman <[EMAIL PROTECTED]> wrote:
> hi all,
>
> i'm getting the following from cdrecord:
>
> ...
> Track 07: audio 39 MB (03:56.66) no preemp
> Track 08: audio 54 MB (05:22.84) no preemp
> Track 09: audio 36 MB (03:35.49) no preemp
> Track 10: audio 27 MB (02:41.33) no preemp
> Track 11: audio 46 MB (04:39.17) no preemp
> ...
>
> what exactly is "preemp"? it sure looks like an error message to me.
> if it is, what can i do to fix the situation?
"Preemp" refers to "pre-emphasis". It's a technique in which the treble
frequencies of the signal are pre-emphasized (boosted) by several decibels
before the signal is converted from analog to digital form. Tracks which
were recorded with pre-emphasis are flagged accordingly in the table-of-contents
and in the subcode. During playback, a CD player will detect the presence of
the preemphasis flag, and will switch in a treble-cut filter which de-emphasizes
the boosted treble and restores a flat frequency response. This treble-cut filter
also cuts the high-frequency components of the quantization noise.
Preemphasis is only rarely used today.
The message you are seeing is not an error - it's the normal situation.
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