From: "Måns Rullgård" <mans@mansr.com>
To: tsepp2000@web.de
Cc: sox-users@lists.sourceforge.net
Subject: Re: upsampling and sinc-filter
Date: Mon, 22 Feb 2021 11:12:59 +0000 [thread overview]
Message-ID: <yw1xh7m4jqys.fsf@mansr.com> (raw)
In-Reply-To: <71bb89f2-55d0-12e9-17a4-7d1b145bbe2b@web.de> (tsepp's message of "Mon, 22 Feb 2021 07:15:39 +0100")
tsepp2000@web.de 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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prev parent reply other threads:[~2021-02-22 11:13 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-20 12:36 upsampling and sinc-filter tsepp2000
2021-02-20 13:01 ` Måns Rullgård
2021-02-22 6:15 ` tsepp2000
2021-02-22 11:12 ` Måns Rullgård [this message]
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