:: > testsignal4.wav: It *is* Enya. One of the songs of the Albums
:: > "Watermark" and "Shepherd Moon". But it is not the
:: > most difficult piece.
::
:: It is most probably the song "I want tomorrow" from the album "The Celts". I'm
:: 99% sure. I'll confirm if I'm wrong. :-)
::
I raise to 99.99%. It's 0:43...0:47 of "I wan't tommorow" from the album
"The Celt" performed by Enya. That explains why I haven't found it
yesterday. The are a lot of similar spots in a lot of Enya albums.
:: > BlackBird.wav: Also distortions in the original PCM file in the
:: > right channel. Around 2 kHz I think. First I thought
:: > it is a MP3 artefact, then a bug in the PC sound
:: > card. But it isn't.
::
:: MP3Enc sure has trouble with it while some other encoders don't. Very good test
:: wave. What is the bug in the original PCM file, anyway?
::
I analyzed the chunk and found out what the noise is:
It's a very small noise band at constant 12.00 +/- 0.03 kHz.
It is modulated in amplitude with some Hz and also swells up and down.
It is strong after ticks 4-6, 12-14 and 20-21 in the left,
and after ticks 5, 6, 13, 14 and 21 in the right.
Level is around -40 dB peak. That's 24 dB above the floor and a lot of
decibels above the masking threshold (how many?).
There is also a more constant 16.00 +/- 0.03 kHz signal at -54 dB (+10 dB
over floor), but this I can't hear it.
The reverb of the drums is cutted at a little bit above 11 kHz (44.1 kHz/4?).
May be it is a part of the piece of music, but it not sounds natural and
disturbs a little bit.
--
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Frank Klemm
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