From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from lists.gentoo.org (pigeon.gentoo.org [208.92.234.80]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by finch.gentoo.org (Postfix) with ESMTPS id 7BFFC138350 for ; Sat, 25 Apr 2020 13:19:29 +0000 (UTC) Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 3A328E091C; Sat, 25 Apr 2020 13:19:22 +0000 (UTC) Received: from mail-qk1-x733.google.com (mail-qk1-x733.google.com [IPv6:2607:f8b0:4864:20::733]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by pigeon.gentoo.org (Postfix) with ESMTPS id C569CE0917 for ; Sat, 25 Apr 2020 13:19:21 +0000 (UTC) Received: by mail-qk1-x733.google.com with SMTP id c63so13235179qke.2 for ; Sat, 25 Apr 2020 06:19:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=Wh3o4FSCASEwiZcn/ug4g+U3pRESRgZBLQ53L6pflDU=; b=pfIWfoepgRwA6N24S3aNrZUjBFYBedixLzjMdr5h7ucWFAthgsrKWo+pZF3j0LaGjo gPnSicpQoMzfqjnfIu4budKYh9kM7bPYq9Bo1JyvhMf+OjnY+aKzBbZB4+THm/kx5Wvi nUGI32YJQiEtL2dPtfXIJzDaM9YYNX7VRNsZtCuzEWRlKPDFN0HivOUIcDGPrDLk9LV5 KzDKijiHKHaYEwadnUaPpFyUWTPd4XkHNG1bm/KXOqYsvYFp3COcTWXCw7A6U/NldUaF cP0a7dTNiGuSDDmQ2yZD0ItW06dK71sZVVQN9SA5r4NcAKcvUWkhorI9n/5s0IDkQN8G LBzg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to; bh=Wh3o4FSCASEwiZcn/ug4g+U3pRESRgZBLQ53L6pflDU=; b=baAFFvteMsuOPSie6xnn93wc32EUxeB1W6u8ZXm87Fz/TTjgNJUhB4/kEaxstiiR6M fn7Aq1e0lpgcQl/J4SfexSs4PJEE44HPrj0K1DEupodAWYdkAh+dWVX7ShLQltbU2Xpa 42eFgyOSQI6bGjA+GaQtO4OUqgl+bm3ymzuPTynQh/gCnmHlTflrW8flx1bqDnHAg6vh O7saEVDut9102Qwz4Rjrz3tuPwO51nGA+8bHcxwU3J5wwEG1cUufdZGeUrLLxS4oqxR8 u2fLltwj9n/qZ6S64DOncuN7XpiQP0Hu+qd+uVKaQcIK5mYv5KlRkaANSVUmUs5WIPR0 +aeg== X-Gm-Message-State: AGi0PuZD3OpYbtChWIMICpnL9tA3LOKjvRPkfPmnsbHc7caitaaOCOIc J27C2WUapG9BJAzW32UXg1EDl67/UmYut5MW4qmoLoz8clA= X-Google-Smtp-Source: APiQypJCcDi5illGjcihNLYJ/c+o+QE4XF/i1P/lQORDXAYgQ//hkw9frxH4JtPdGHcCrx1sSz6bf7xAm6F7yVmicTk= X-Received: by 2002:a05:620a:1395:: with SMTP id k21mr13868699qki.120.1587820760646; Sat, 25 Apr 2020 06:19:20 -0700 (PDT) Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org X-Auto-Response-Suppress: DR, RN, NRN, OOF, AutoReply MIME-Version: 1.0 References: <3298791.iIbC2pHGDl@lenovo.localdomain> <1840287.usQuhbGJ8B@lenovo.localdomain> In-Reply-To: From: Mark Knecht Date: Sat, 25 Apr 2020 06:19:09 -0700 Message-ID: Subject: Re: [gentoo-user] ALSA wizard... To: Gentoo User Content-Type: multipart/alternative; boundary="00000000000067c81305a41d545c" X-Archives-Salt: c6b66d0d-dfda-4af6-b62f-8b32a9297cb8 X-Archives-Hash: 201d295eefcc43a2d4cd115c4f13fc2e --00000000000067c81305a41d545c Content-Type: text/plain; charset="UTF-8" > > > https://www.amazon.de/dp/B00EK1OTZC/ref=pe_3044161_189395811_TE_SCE_dp_1 > > > > OK, that device is pretty simple. If you set this device as the default Alsa device can you get simple audio, from YouTube for example, out through the headphone jack? We know the mic input works. If both of those work then what does discord do? > > I'm lost here. The headphone jack in the interface is just a monitor. > I don't think there's any connection with the headphone jack in the > motherboard? (I can't test it anyway with my headphones---different > jack sizes) > I understand the jack size difference. Your MB jack is 3.5mm, the headphone jack on the Behringer is 1/4". All the headphones I've purchased for years came with an adapter to plug into 1/4" jack but if your didn't they can be purchased at Amazon or general stereo/TV type stores. (Best Buy as an example in the U.S.) Search for "3.5mm to 1/4 adapter". I'll explain the headphone monitor function in a moment. You are correct that the headphone jack on the Behringer has nothing to do with the headphone jack on the computer. The Behringer is a complete sound card with 2 inputs and 2 output at the end of a USB cable. It has phono jack outputs on the back which would allow you to hook it to your stereo inputs to hear computer audio. In that sense it's no different than a CD player or tape deck. To use the outputs on the back would simply come down to telling Linux I want to use the Behringer USB device as my sound card and all sound would be router there. Once the audio is correctly going to your stereo you should also hear the audio over the headphone jack. The monitor function associated with the headphones is different on cards like this. Notice that the switch says "Direct Monitor". Imagine that I am recording a song. I already have some of it recorded, say drums, bass and piano. Now I want to record vocals so (wearing headphones so I can hear what I'm supposed to sing along with) I sing into the microphone but there is latency in the system. The vocal gets converted to digital by an internal A/D converter, sent down the USB cable, routed to the recording application - in Linux lets say that's Ardour. Ardour records it onto disk but it also sends my vocal back to the Behringer so I hear myself in the headphones. The probably is that my vocal is delayed by 25mS or more. It sounds out of time and I'm confused. It sounds like an echo. Look at the diagram here to see what I'm trying to explain: https://manual.ardour.org/synchronization/latency-and-latency-compensation/ Direct monitoring changes the signal path in the picture on the Ardour page. It still sends my vocal down the USB cable and Ardour still records it but it __ALSO__ sends my vocal __DIRECTLY__ from the mic to the headphones skipping the whole digital path in the picture. There is no delay. I hear myself in time with the music. It feels natural and I perform my part of the song brilliantly and go on to make millions of dollars. (Well, maybe...) Direct monitoring probably won't matter i your application because the real-time nature of what you're speaking won't be effected very much and probably discord or zoom won't send it back out to the card, but only send it to the people you are meeting with. Hope this helps, Mark --00000000000067c81305a41d545c Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


<SNIP>
> > > https:/= /www.amazon.de/dp/B00EK1OTZC/ref=3Dpe_3044161_189395811_TE_SCE_dp_1
= > >
> > OK, that device is pretty simple. If you set this de= vice as the default Alsa device can you get simple audio, from YouTube for = example, out through the headphone jack? We know the mic input works. If bo= th of those work then what does discord do?
>
> I'm lost he= re. The headphone jack in the interface is just a monitor.
> I don= 9;t think there's any connection with the headphone jack in the
>= motherboard? (I can't test it anyway with my headphones---different> jack sizes)
>

I understand the jack size difference. You= r MB jack is 3.5mm, the headphone jack on the Behringer is 1/4". All t= he headphones I've purchased for years came with an adapter to plug int= o=C2=A0 1/4" jack but if your didn't they can be purchased at Amaz= on or general stereo/TV type stores. (Best Buy as an example in the U.S.) S= earch for "3.5mm to 1/4 adapter".

I'll exp= lain the headphone monitor function in a moment. You are correct that the h= eadphone jack on the Behringer has nothing to do with the headphone jack on= the computer. The Behringer is a complete sound card with 2 inputs and 2 o= utput at the end of a USB cable. It has phono jack outputs on the back whic= h would allow you to hook it to your stereo inputs to hear computer audio. = In that sense it's no different than a CD player or tape deck. To use t= he outputs on the back would simply come down to telling Linux I want to us= e the Behringer USB device as my sound card and all sound would be router t= here. Once the audio is correctly going to your stereo you should also hear= the audio over the headphone jack.

The monitor fu= nction associated with the headphones is different on cards like this. Noti= ce that the switch says "Direct Monitor". Imagine that I am recor= ding a song. I already have some of it recorded, say drums, bass and piano.= Now I want to record vocals so (wearing headphones so I can hear what I= 9;m supposed to sing along with) I sing into=C2=A0the microphone but there = is latency in the system. The vocal gets converted to digital by an interna= l A/D converter, sent down the USB cable, routed to the recording applicati= on - in Linux lets say that's Ardour. Ardour records it onto disk but i= t also sends my vocal back to the Behringer so I hear myself in the headpho= nes. The probably is that my vocal is delayed by 25mS or more. It sounds ou= t of time and I'm confused. It sounds like an echo.

Look at the diagram here to see what I'm trying to explain:
=


Direct m= onitoring changes the signal path in the picture on the Ardour page. It sti= ll sends my vocal down the USB cable and Ardour still records it but it __A= LSO__ sends my vocal __DIRECTLY__ from the mic to the headphones skipping t= he whole digital path in the picture. There is no delay. I hear myself in t= ime with the music. It feels natural and I perform my part of the song bril= liantly and go on to make millions of dollars. (Well, maybe...)=C2=A0
=

Direct monitoring probably won't matter i your appl= ication because the real-time nature of what you're speaking won't = be effected=C2=A0very much and probably discord or zoom won't send it b= ack out to the card, but only send it to the people you are meeting with.

Hope this helps,
Mark

<= /div>
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