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Filter Description

none No sample rate conversion happens. Only sample depth is

changed as needed.

IIR This is analog-sounding filter, especially suitable for recordings

containing strong transients, long post-echo is a side effect (not

usually audible due to masking). A really steep IIR filter is used.

This filter type is similar to analog filters and has no pre-echo, but

has a long post-echo. Small amount of pass-band ripple is also

present. IIR filter is applied in time-domain. This filter performs

better when resampling with only factor of 2 or 3 and somewhat

worse at factor of 4 and higher.

FIR Typical “oversampling” digital filter, generally suitable for most

uses (slight pre- and post-echo), but best on classical music

recorded in a real world acoustic environment such as concert hall.

This is the most ordinary filter type, usually present in hardware.

This filter is applied in time-domain. It has average amount of pre-

and post-echo.

asymFIR Asymmetric FIR, good for jazz/blues, and other music containing

transients recorded in real world acoustic environment. Otherwise

same as FIR, but with a shorter pre-echo and longer post-echo.

Modifies phase response, but not as much as minimum phase

FIR.

minphaseFIR Minimum phase FIR, good for pop/rock/electronic music containing

strong transients such as drums and percussion and where

recording is made in a studio using multi-track equipment. No pre-

echo, but somewhat long post-echo.

FFT Technically good steep “brickwall” filter, but might have some side

effects (pre-echo) on material containing strong transients. This

filter is similar to FIR, but it is applied in frequency-domain and is

quite efficient from performance point of view while having rather

long impulse response.

poly-sinc /

better space

Linear phase polyphase sinc filter. Very high quality linear phase

resampling filter, can perform most of the typical conversion ratios.

Good phase response, but has some amount of pre-echo. See

“FIR” for further details.

poly-sinc-mp /

better transients

Minimum phase polyphase sinc filter, otherwise similar to poly-

sinc. Altered phase response, but no pre-echo. See

“minphaseFIR” for further details.

poly-sinc-shrt Otherwise similar as poly-sinc, but shorter pre- and post-echos at

the expense of filtering quality (not as sharp roll-off and reduced

stop-band attenuation).

poly-sinc-shrt-mp Minimum phase variant of poly-sinc-shrt. Otherwise similar to poly-

sinc-mp, but shorter post-echo. Most optimal transient

reproduction.