Re: upsampling and sinc-filter

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tsepp2000@xxxxxx writes:

>> Am 20.02.2021 um 14:01 schrieb:
>>>
>>>> Hi all,
>>>>
>>>> I want to make 3 changes to a wav-file: 1. bit depth, 2. upsampling and
>>>> 3. sinc-filter - at one time. For the upsampling I assume -L and for the
>>>> filter I assume -L. Does Sox calculate this several times in a row? Is
>>>> this the correct and most effective command?
>>>>
>>>> sox 16bit_44_1.wav -b 32 -e float output.wav rate -v -L 88200 sinc -a 80
>>>> -L -21000 -t 2100
>>>
>>> What is the purpose of the lowpass filter here?
>
> The answer is YES? :-)

Huh?  The resampling (rate effect) applies a low-pass filter at about 21
kHz already.  What is the purpose another one (sinc effect)?

-- 
Måns Rullgård


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