Re: Test report iTunes SRC
Re: Test report iTunes SRC
- Subject: Re: Test report iTunes SRC
- From: Richard Dobson <email@hidden>
- Date: Fri, 05 Sep 2008 10:33:49 +0100
Mikael Hakman wrote:
Using my precision tools for assessing quality of audio devices and
algorithms I investigated iTunes SRC. The test report is at
http://www.dkab.net/iTunes report.pdf.
As compared to previous MBP built-in audio device report at
http://www.dkab.net/Realtek HDA report.pdf, the new report contains
4 additional analyses and charts. These are: a comparison between test
and response signals, differences between the two, and variations of
amplitude and phase with frequency. MBP built-in device report has also
been updated to contain the new analyses.
Excellent to include the time-domain figures. Really does make it clear
eactly what you are doing. May I suggest numbering the figures? This
will make it easier to refer to them within the text, and for example to
note the similarity between the blue line in the 13th figure and the
right hand half of the IR in the first figure (which I still think
should simply be called the impulse response, and not the "single pulse
response"). It is now clear the measurement starts aligned to the centre
peak of the IR (the first half in effect being truncated); something
that I do not think is clear from the text. Since for a given input
length N the output length must be N+(L-1) where L is the length of the
IR (i.e. including both pre- and post-ringing), it is important to be
sure which parts of the full output are being truncated to obtain the
matching 4800 samples.
Richard Dobson
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