ref: 8b7c2ffd11bb24ce70f011fa2023ef3112025af3
parent: 433944e934391e4a3792c21480776cdc65d5f21c
author: robs <robs>
date: Sat Oct 18 17:08:40 EDT 2008
doc/comment tweaks
--- a/sox.1
+++ b/sox.1
@@ -1163,7 +1163,7 @@
four different notes in total:
.EX
play -n synth 2.5 sin 667 gain 1 \\
- bend .35,180,.25 .15,740,.53 0,-520,.3
+ bend .35,180,.25 .15,740,.53 0,-520,.3
.EE
Note that the clipping that is produced in this example is deliberate;
to remove it, use
@@ -2011,13 +2011,13 @@
center box;
lB lw52.
\-M/\-I/\-L Phase response = minimum/intermediate/linear
+\-s Steep filter (band-width = 99%)
+\-a Allow aliasing above the pass-band
+\-b\ 74\-99\*d7 Any band-width %
\-p\ 0\-100 T{.na
Any phase response (0 = minimum, 25 = intermediate, 50 = linear, 100 = maximum)
T}
-\-s Steep filter (band-width = 99%)
-\-b\ 74\-99\*d7 Any band-width %
-\-a Allow aliasing above the pass-band
.TE
.DT
.SP
--- a/src/rate.c
+++ b/src/rate.c
@@ -261,7 +261,7 @@
work[i + work_len / 2] = 0;
}
lsx_safe_rdft(work_len, 1, work);
- /* Some DFTs require phase unwrapping here, but rdft seems not to. */
+ /* Some filters require phase unwrapping here, but ours seem not to. */
for (i = 2; i < work_len; i += 2) /* Interpolate between linear & min phase */
work[i + 1] = phase * M_PI * .5 * i + (1 - phase) * work[i + 1];
@@ -319,9 +319,8 @@
f->post_peak = num_taps / 2;
}
else {- /* Empirical adjustment to negate att degradation with intermediate phase */
+ /* Adjustment to negate att degradation with intermediate phase */
double att = phase && phase != 50 && phase != 100? atten * (34./33) : atten;
-
double * h = design_lpf(Fp, 1., 2., allow_aliasing, att, &num_taps, 0);
if (phase != 50)
@@ -442,7 +441,7 @@
{2 * array_length(half_fir_coefs_low) - 1, half_fir_coefs_low, 0,0}, {0, NULL, .931, 110}, {0, NULL, .931, 125}, {0, NULL, .931, 170}};filter_t const * f = &filters[quality - Low];
- double att = allow_aliasing? (34./33)* f->a : f->a;
+ double att = allow_aliasing? (34./33)* f->a : f->a; /* negate att degrade */
double bw = bandwidth? 1 - (1 - bandwidth / 100) / TO_3dB : f->bw;
double min = 1 - (allow_aliasing? MAX_TBW0A : MAX_TBW0) / 100;
assert((size_t)(quality - Low) < array_length(filters));
@@ -667,11 +666,11 @@
" -v very high interm. 95% 175 24-bit mastering",
" OVERRIDE OPTIONS (only with -m, -h, -v)",
" -M/-I/-L Phase response = minimum/intermediate/linear",
- " -p 0-100 Any phase response (0 = minimum, 25 = intermediate,",
- " 50 = linear, 100 = maximum)",
" -s Steep filter (band-width = 99%)",
- " -b 74-99.7 Any band-width %",
" -a Allow aliasing 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)",
};
static char * usage;
handler.usage = lsx_usage_lines(&usage, lines, array_length(lines));