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From: Steve Simon <steve@quintile.net>
To: 9front@9front.org
Subject: Re: [9front] pi4 wifi and audio
Date: Sat, 12 Feb 2022 18:46:47 +0000	[thread overview]
Message-ID: <5FC4FAA8-FB1D-464B-97DB-ED467195F0D3@quintile.net> (raw)
In-Reply-To: <CAFSF3XMZWNeriJ7XG8n3nzR1wdw1RSNHQgKW4fNLBw-ErN7ZdQ@mail.gmail.com>

i assume you mean adding a DAC to I2S, I2C doesn’t have the bandwidth for quality audio even at 400khz.

using and external dac over I2S can make a very significant (very measurable) difference to the quality of the audio you can extract from a rpi.

the most important part of this is locking the pi’s i2s stream to external crystals, and having quiet power supplies for the dac and any downstream gain stages.

i am afraid $1 chinese usb dacs are a poor second choice.


> On 12 Feb 2022, at 6:16 pm, hiro <23hiro@gmail.com> wrote:
> yes, miller's version has wifi. i don't remember if anybody did the
> work to bring it to 9front, but in any case they didn't finish it ( ==
> mainline it).
> audio, some people wasted their time with the incomplete audio
> solution in the rpi, it but then gave up IIRC.
> some people like to add a DAC to the I2C bus, but i consider that also
> a waste of time, esp. as long as you can get 1$ USB->audio converters
> including shipping from china, the quality is 100% matching the rpi
> hardware, and a lot better than most DIY rpi audio add-ons.
> as much as i hate USB, for soundcards that's good enough and we
> already support it.
>> On 2/12/22, thinktankworkspaces@gmail.com <thinktankworkspaces@gmail.com> wrote:
>> So 9front on pi4 seems pretty stable. But has anyone got audio and wifi
>> working. I recall
>> reading some place that pi hardware developers kind of deviated from
>> convention so its a bit
>> tricky to get some of that stuff working. Perhaps I might also be asking for
>> some sort of
>> guide to read on how to build or deal with making drivers in 9front and some
>> troubleshooting
>> steps to follow. Ponies and Unicorns I want those also, so yea.

  reply	other threads:[~2022-02-12 19:33 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-12 17:43 thinktankworkspaces
2022-02-12 18:07 ` hiro
2022-02-12 18:46   ` Steve Simon [this message]
2022-02-12 20:56 ` Thaddeus Woskowiak
2022-02-12 22:45   ` thinktankworkspaces
2022-02-13  0:40     ` hiro
2022-02-13  2:55       ` thinktankworkspaces
2022-02-13  3:25     ` Thaddeus Woskowiak
2022-02-13  7:37       ` Steve Simon

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