[AudioI] "Tck" sound between tracks

Fri Feb 16 09:46:40 UTC 2024

Nice !

What do you think of the sound quality from the Japan Radio opamps ?

Matt

On 16/2/24 19:08, mott wrote:
> OS is Raspbian 11 - Bullseye. Streaning is done by the Logitech Media 
> Server (LMS) using the Qobuz plugin, among others. The player, which 
> is streamed to by LMS and is configured to use the audioinjector, is 
> Squeezelite.
>
>
>
>
>
> Enviado do meu Galaxy
>
>
> -------- Mensagem original --------
> De : Matt Flax <matt at audioinjector.net>
> Data: 15/02/2024 20:52 (GMT-03:00)
> Para: mott <mott at escuta.org>, people at lists.audioinjector.net
> Assunto: Re: [AudioI] "Tck" sound between tracks
>
> 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
> >
> >
> > --
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