[AudioI] "Tck" sound between tracks

[Matt Flax]

out of interest, What operating system / software are you running ?

On 16/2/24 10:32, mott wrote:
>
> With the auto-mute disabled in alsa-mixer, and when I play an album in 
> Qobuz, there seems to be a relay tck only at the beginning of the 
> album, but not between tracks. I don't know if that makes sense but 
> it's what I'm hearing now. It's also fine by me. There are no problems 
> with this setting when the Pi is rebooted or when the LMS "player" is 
> reset. Just the click of the relay, and yes, a quiet pop in the speakers.
>
> Thanks,
>
> Iain
>
>
> Enviado do meu Galaxy
>
>
> -------- Mensagem original --------
> De : Iain Mott via People <people at lists.audioinjector.net>
> Data: 15/02/2024 06:30 (GMT-03:00)
> Para: Matt Flax <matt at audioinjector.net>, people at lists.audioinjector.net
> Assunto: Re: [AudioI] "Tck" sound between tracks
>
> My apologies. Yesterday, I had ssh'd to the wrong Raspberry Pi, so I was
> actually looking at the audio-injector stereo card on a different device
> and not the Pro/XLR. It's too early in the morning to test, but if
> auto-mute is disabled in alsamixer, does this mean that the start up
> noise you mention will be heard as the driver is loaded?
>
> The pop in the signal is not loud. It's less loud than the relay "tck",
> but it's audible. I actually purchased the RCA pre in addition to the
> XLR pre and will use the former with my stereo system (will use the XLR
> board for other things), however the RCA board is stuck in customs and
> that's why I'm using the XLR. There are no devices attached to the XLR
> board's inputs. I can't see a way to mute the inputs in alsamixer. The
> master control seems to be shared by playback and capture.
>
> Iain
>
>
>
> Em 14/02/2024 21:47, Matt Flax escreveu:
> > Referring to the ALSA SoC driver for the Pro and Isolated Audio Injector
> > soundcards :
> > 
> https://github.com/raspberrypi/linux/blob/rpi-6.1.y/sound/soc/bcm/audioinjector-isolated-soundcard.c#L57-L75
> >
> > The mute relay is operated as part of the _trigger ALSA function calls.
> > it is possible to find a better place to put them. Perhaps 
> digital_mute ?
> >
> > That would require some experimentation.
> >
> > What is absolutely fundamentally important is that the mute relay
> > remains off, while the dirver loads - otherwise there is spurious
> > startup noise which can be absolutely terrible.
> >
> > About pops and clicks ...
> >
> > In the XLR preamplifier hardware there are no AC coupling caps. This
> > means that any DC voltage on the input from any of your sources can make
> > their way through the system to the output.
> >
> > Out of interest, how loud is the pop or click on playback start ?
> >
> > Matt
> >
> > On 15/2/24 01:16, Iain Mott via People wrote:
> >> There doesn't seem to be an option to disable auto-mute in alsamixer,
> >> unfortunately. A box would be to reduce the noise made by the relay
> >> itself (acoustic noise), not the noise in the speakers.
> >>
> >> Iain
> >>
> >> Em 14/02/2024 08:41, jr52884--- via People escreveu:
> >>> Matt,
> >>>
> >>> Isn't there an option to disable that in alsamixer? I don't remember.
> >>> I don't have one in use to check.
> >>>
> >>> Iain,
> >>>
> >>> I doubt putting it in an enclosure would help as the relay transient
> >>> is present on your audio line. There may be an option to disable the
> >>> auto mute in alsamixer, but I don't remember.
> >>>
> >>> Jonathan
> >>>
> >>> On Tuesday, February 13, 2024 at 03:52:40 PM EST, mott via People
> >>> <people at lists.audioinjector.net> wrote:
> >>>
> >>>
> >>> Ah, so it is. But there is also a transient heard in the speakers.
> >>> Not so loud and more of a pop sound. I'll look into boxing the
> >>> pi/audio injector to reduce the relay noise.
> >>>
> >>> Iain
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> Enviado do meu Galaxy
> >>>
> >>>
> >>> -------- Mensagem original --------
> >>> De : mott via People <people at lists.audioinjector.net>
> >>> Data: 13/02/2024 16:54 (GMT-03:00)
> >>> Para: people at lists.audioinjector.net
> >>> Assunto: [AudioI] "Tck" sound between tracks
> >>>
> >>>
> >>> Hi,
> >>>
> >>> I've been using the Pro card with the XLR preamp on a Pi 3b to listen
> >>> to Qobuz and Tidal streaming services by way of the Logitech Media
> >>> Server (LMS) running on the same computer. My system has never
> >>> sounded better. There's a quiet but noticeable "tck" sound, however,
> >>> when a track starts,  when "stop" is pressed on the LMS interface and
> >>> sometimes two tcks are sounded between tracks.
> >>>
> >>> It's not a big problem, but I thought I'd mention it. It never
> >>> happened with the old audio injector stereo card. I've tested the
> >>> streaming with LMS's standard web interface and also with an Android
> >>> app called Squeezer.
> >>>
> >>> Cheers,
> >>>
> >>> Iain
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> Enviado do meu Galaxy
> >>>
> >>>
> >>> --
> >>> People mailing list
> >>> People at lists.audioinjector.net
> >>> https://lists.audioinjector.net/mailman/listinfo/people
> >>>
> >> --
> >> _______
> >> Iain Mott
> >> https://escuta.org
> >>
> -- 
> _______
> Iain Mott
> https://escuta.org
>
>
> -- 
> People mailing list
> People at lists.audioinjector.net
> https://lists.audioinjector.net/mailman/listinfo/people

-- 
Checkout the community email list :
https://lists.audioinjector.net/mailman/listinfo/people