Modify the bsinc resampler

Readjusted the bsinc12 cutoff back to -60dB. Also increased the filter's phase
count.

2 files changed, 4 insertions, 4 deletions

diff --git a/alc/alu.h b/alc/alu.h
index 1d530602..06be1a01 100644
--- a/alc/alu.h
+++ b/alc/alu.h
@@ -59,7 +59,7 @@ extern Resampler ResamplerDefault;
  */
 #define BSINC_SCALE_BITS  4
 #define BSINC_SCALE_COUNT (1<<BSINC_SCALE_BITS)
-#define BSINC_PHASE_BITS  4
+#define BSINC_PHASE_BITS  5
 #define BSINC_PHASE_COUNT (1<<BSINC_PHASE_BITS)
 
 /* Interpolator state.  Kind of a misnomer since the interpolator itself is
diff --git a/native-tools/bsincgen.c b/native-tools/bsincgen.c
index 83f03191..de59ddff 100644
--- a/native-tools/bsincgen.c
+++ b/native-tools/bsincgen.c
@@ -53,7 +53,7 @@
 // The number of distinct scale and phase intervals within the filter table.

 // Must be the same as in alu.h!

 #define BSINC_SCALE_COUNT 16

-#define BSINC_PHASE_COUNT 16

+#define BSINC_PHASE_COUNT 32

 

 /* 48 points includes the doubling for downsampling, so the maximum number of

  * base sample points is 24, which is 23rd order.

@@ -353,8 +353,8 @@ int main(int argc, char *argv[])
 "};\n\n", BSINC_SCALE_COUNT, BSINC_PHASE_COUNT);

     /* A 23rd order filter with a -60dB drop at nyquist. */

     BsiGenerateTables(output, "bsinc24", 60.0, 23);

-    /* An 11th order filter with a -40dB drop at nyquist. */

-    BsiGenerateTables(output, "bsinc12", 40.0, 11);

+    /* An 11th order filter with a -60dB drop at nyquist. */

+    BsiGenerateTables(output, "bsinc12", 60.0, 11);

 

     fprintf(output, "} // namespace\n");

     if(output != stdout)