Re: synth seems to generate "pops"?

--===============8127679855679789779==
Content-Type: multipart/alternative; boundary="000000000000b4d81306312dcc4a"

--000000000000b4d81306312dcc4a
Content-Type: text/plain; charset="UTF-8"

On Tue, 25 Mar 2025 at 12:57, SoX NG <[email protected]> wrote:

> On 25/03/25 15:58, Brian Watson wrote:
> > play -r 44100 -n -t alsa synth 0.5 sin 5000 vol -25dB remix 1 0
> >
> > wrapped into a script with the frequency, gain and remix parameters
> > replaced with variables will work exactly as I had hoped.
> >
> > Except - when I listen to the generated sounds there is a small pop, or
> > crack, at the start and end of each sound.
>
> I've tried your exact command line here (Debian GNU/Linux)
> and just get a peep, no pops.
>
> One workaround would be generate them first and play them
> in one session, if that is feasible in your use case.
>
> for f in 5000 6000 7000 8000 9000 10000
> do
>          sox -n tone-$f.wav synth 0.5 sin $f
> done
> play --combine concat tone*wav
>

This won't really work.  I'm planning to play hundreds of tones with logic
like "that frequency on that channel was heard at -30dB - next time try
-40dB" etc. etc.

If instead you need variable pauses between tones, I suspect you need
> a different sound device; USB ones exist and are cheap0est and easiest
> if quality is not at a premium.
>

My USB hardware is a Schiit Modi+ DAC.  This is far from "premium" by HiFi
DAC standards, but I believe it should be more than capable of this task. I
tried using the built-in sound hardware in my device (card 1: PCH [HDA
Intel PCH], device 0: ALC283 Analog [ALC283 Analog]) and I get similar, but
worse, artefacts at the end - there in now some delay between the end of
the tone and the "pop" and the different channels seem to "pop"
independently.

--000000000000b4d81306312dcc4a
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_quote gmail_quote_container"><div dir=
=3D"ltr" class=3D"gmail_attr">On Tue, 25 Mar 2025 at 12:57, SoX NG &lt;<a h=
ref=3D"mailto:[email protected]">[email protected]</a>&gt; wrote:<br></=
div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;bor=
der-left:1px solid rgb(204,204,204);padding-left:1ex">On 25/03/25 15:58, Br=
ian Watson wrote:<br>
&gt; play -r 44100 -n -t alsa synth 0.5 sin 5000 vol -25dB remix 1 0<br>
&gt;<br>
&gt; wrapped into a script with the frequency, gain and remix parameters<br=
>
&gt; replaced with variables will work exactly as I had hoped.<br>
&gt;<br>
&gt; Except - when I listen to the generated sounds there is a small pop, o=
r<br>
&gt; crack, at the start and end of each sound.<br>
<br>
I&#39;ve tried your exact command line here (Debian GNU/Linux)<br>
and just get a peep, no pops.<br>
<br>
One workaround would be generate them first and play them<br>
in one session, if that is feasible in your use case.<br>
<br>
for f in 5000 6000 7000 8000 9000 10000<br>
do<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0sox -n tone-$f.wav synth 0.5 sin $f<br>
done<br>
play --combine concat tone*wav<br></blockquote><div><br></div><div>This won=
&#39;t really work.=C2=A0 I&#39;m planning to play hundreds of tones with l=
ogic like &quot;that frequency on that channel was heard at -30dB - next ti=
me try -40dB&quot; etc. etc. <br></div><div><br></div><blockquote class=3D"=
gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(20=
4,204,204);padding-left:1ex">If instead you need variable pauses between to=
nes, I suspect you need<br>
a different sound device; USB ones exist and are cheap0est and easiest<br>
if quality is not at a premium.<br></blockquote><div><br></div><div>My USB =
hardware is a Schiit Modi+ DAC.=C2=A0 This is far from &quot;premium&quot; =
by HiFi DAC standards, but I believe it should be more than capable of this=
 task. I tried using the built-in sound hardware in my device (card 1: PCH =
[HDA Intel PCH], device 0: ALC283 Analog [ALC283 Analog]) and I get similar=
, but worse, artefacts at the end - there in now some delay between the end=
 of the tone and the &quot;pop&quot; and the different channels seem to &qu=
ot;pop&quot; independently.</div><div>=C2=A0</div><br></div></div>

--000000000000b4d81306312dcc4a--


--===============8127679855679789779==
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: inline


--===============8127679855679789779==
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

_______________________________________________
Sox-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/sox-users

--===============8127679855679789779==--