shithub: libsamplerate

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Add example super high quality 4x upsampler.

--- a/make_src_filter.m

+++ b/make_src_filter.m

@@ -4,9 +4,9 @@

 # 

 # f = make_filter (67, 128, 100.3) ;

 # f = make_filter (13, 128, 100.5) ;

+# f = make_filter (185, 4, 157.0) ;

-

 #=======================================================================

 if nargin < 3,

@@ -86,7 +86,7 @@

 printf ("# f = make_filter (%d, %d, %4.1f) ;\n", cycles, increment, atten) ;

 printf ("#   Coeff. count     : %d\n", N) ;

 printf ("#   Fudge factor     : %9.7f\n", fudge_factor) ;

-printf ("#   Pass band width  : %10.8f (should be %10.8f)\n", stop_band_start, 0.5 / increment) ;

+printf ("#   Pass band width  : %12.10f (should be %12.10f)\n", stop_band_start, 0.5 / increment) ;

 printf ("#   Stop band atten. : %5.2f dB\n", abs (stop_atten)) ;

 printf ("#   -3dB band Width  : %5.3f\n", 0.5 / increment / minus_3db) ;

 printf ("#   half length      : %d\n", length (half_f)) ;