[AudioI] "Tck" sound between tracks

Fri Feb 16 11:53:30 UTC 2024

Whatever components you have in there, it's sounding fabulous.

When I changed the Injector card, I also upgraded all the cabling of my 
stereo (nothing silly but good 100% copper, O2-free cables), bi-amped 
the speakers, shifted from Tidal streaming to Qobuz and rearranged the 
speakers in the room. So the improvement from all of these things has 
been significant, and it's very hard to tell what's doing what. Some 
time in the future though, I'll do a side-by-side comparison with the 
Stereo card. It'll be interesting to compare the two.

Cheers and thanks,

Iain

Em 16/02/2024 06:46, Matt Flax escreveu:
> 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
>>>>>>
>>>>>>
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>>>>>> 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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>>
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_______
Iain Mott
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