resample filter: Infrastructure.
[paraslash.git] / m4 / gengetopt / resample_filter.m4
1 option "converter" c
2 #~~~~~~~~~~~~~~~~~~~
3 "choose converter type"
4 enum typestr = "type"
5 values = "best", "medium", "fastest", "zero_order_hold", "linear"
6 default = "medium"
7 optional
8
9 details = "
10 best: This is a bandlimited interpolator derived from the
11 mathematical sinc function and this is the highest quality
12 sinc based converter, providing a worst case Signal-to-Noise
13 Ratio (SNR) of 97 decibels (dB) at a bandwidth of 97%.
14
15 medium: This is another bandlimited interpolator much like the
16 previous one. It has an SNR of 97dB and a bandwidth of 90%. The
17 speed of the conversion is much faster than the previous one.
18
19 fastest: This is the fastest bandlimited interpolator and
20 has an SNR of 97dB and a bandwidth of 80%.
21
22 zero_order_hold: A Zero Order Hold converter (interpolated
23 value is equal to the last value). The quality is poor but
24 the conversion speed is blindlingly fast.
25
26 linear: A linear converter. Again the quality is poor, but
27 the conversion speed is blindingly fast.
28 "