256kb/s HQ MP3 Frequency Response
256kb/s HQ MP3 Spectral View
With the 256kb/s encoded MP3 file the frequency response
is almost identical to the original up to 18kHz after which it falls
of gently to about 21kHz.
The spectral view shows plenty of high frequency content
right up to 20kHz. Some frequency pruning above 16kHz is obvious
but the trumpet dynamics are well represented.
On listening tests I could not hear any difference
between the 256kb/s MP3 and the original material. Maybe when I
had younger ears I would have been able to detect subtle differences
but not now with my middle aged ears. The sound quality is definitely
Hi-Fi and the quality of your sound card and amplifier is going
to have more effect on the perceived sound than anything else.
CPU utilization on my system at 25% is only slightly
higher than that needed to play a 128kb/s MP3. If storage space
is not an issue this is the way to go for encoding you files until
MP4 technology matures.
We now move on to the MP4 AAC codecs.