Resampler plugin, uses SoX 14.2.0 resampling routines Options

[lvqcl]

Uploaded here

Good quality, fast resampler (~2 times faster than PPHS Ultra, although ~2.5 times slower than regular PPHS). Minimum / intermediate / linear phase.
Any comments?

Added: If you want to know what settings are best:
1. Read SoX FAQ, "What are the best 'rate' settings to resample a file and retain the highest quality?"
2. This post: http://www.hydrogenaudio.org/forums/index....st&p=626176 (an excerpt from SoX help)
3. Feel free to experiment and decide what's best for you.

This post has been edited by lvqcl: Apr 10 2009, 20:37

[lvqcl]

From help file of standalone SoX program (ver. 14.4.0):

CODE

              The simple quality selection described above  provides  settings
              that satisfy the needs of the vast majority of resampling tasks.
              Occasionally, however, it may  be  desirable  to  fine-tune  the
              resampler's  filter  response;  this can be achieved using over‐
              ride options, as detailed in the following table:

              -M/-I/-L     Phase response = minimum/intermediate/linear
              -s           Steep filter (band-width = 99%)
              -a           Allow aliasing/imaging above the pass-band
              -b 74-99.7   Any band-width %
              -p 0-100     Any phase response (0 = minimum, 25 = intermediate,
                           50 = linear, 100 = maximum)

              All resamplers use filters  that  can  sometimes  create  `echo'
              (a.k.a.   `ringing')  artefacts  with  transient signals such as
              those that occur with `finger snaps' or other highly  percussive
              sounds.   Such  artefacts  are much more noticeable to the human
              ear if they occur before the transient (`pre-echo') than if they
              occur  after  it (`post-echo').  Note that frequency of any such
              artefacts is related to the smaller of the original and new sam‐
              pling rates but that if this is at least 44.1kHz, then the arte‐
              facts will lie outside the range of human hearing.

              A phase response setting may be used to control the distribution
              of  any  transient  echo  between `pre' and `post': with minimum
              phase, there is no pre-echo but the longest post-echo; with lin‐
              ear  phase,  pre  and  post echo are in equal amounts (in signal
              terms, but not audibility terms); the intermediate phase setting
              attempts to find the best compromise by selecting a small length
              (and level) of pre-echo and a medium lengthed post-echo.

              Minimum, intermediate, or  linear  phase  response  is  selected
              using  the  -M, -I, or -L option; a custom phase response can be
              created with the -p option.  Note that phase  responses  between
              `linear' and `maximum' (greater than 50) are rarely useful.

              A resampler's band-width setting determines how much of the fre‐
              quency content of the original signal (w.r.t. the original  sam‐
              ple rate when up-sampling, or the new sample rate when down-sam‐
              pling) is preserved during conversion.  The term `pass-band'  is
              used  to  refer  to  all  frequencies up to the band-width point
              (e.g. for 44.1kHz sampling rate, and a resampling band-width  of
              95%,  the  pass-band  represents  frequencies from 0Hz (D.C.) to
              circa 21kHz).  Increasing the resampler's band-width results  in
              a  slower  conversion  and can increase transient echo artefacts
              (and vice versa).

              The -s `steep filter' option changes resampling band-width  from
              the default 95% (based on the 3dB point), to 99%.  The -b option
              allows the band-width to be  set  to  any  value  in  the  range
              74-99.7  %, but note that band-width values greater than 99% are
              not recommended for normal use as they can cause excessive tran‐
              sient echo.

              If the -a option is given, then aliasing/imaging above the pass-
              band is allowed.  For example, with 44.1kHz sampling rate, and a
              resampling  band-width of 95%, this means that frequency content
              above 21kHz can be distorted; however, since this is  above  the
              pass-band  (i.e.   above the highest frequency of interest/audi‐
              bility), this may not be a problem.  The  benefits  of  allowing
              aliasing/imaging  are  reduced  processing time, and reduced (by
              almost half) transient echo artefacts.

This post has been edited by lvqcl: Jun 17 2012, 09:23

[Mix3dmessagez]

Thank you for your great support, one last question, is my setup for it good?

I use 4800hz, very best quality, disabled steep filter and allow aliasing, with a linear phaser option, is this optimal for aac music files?

other dsp's i use...

noise sharpening 34%
advanced limiter

This post has been edited by Canar: Apr 6 2009, 20:37

Reason for edit: quoted without thinking