From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5417671 for ; Fri, 18 Jun 2021 16:33:25 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 110C8613D5; Fri, 18 Jun 2021 16:33:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1624034004; bh=JO2gLgelUahEc1dNQVYz2I/ragI2iCfD3iyf0s0vVmc=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=gsyLR0OZOilo0EEdP29NRWHxpna2TcpNAh65/OuClP+XuPWLnj9OcMeqeYx7BXQ2X pZDWq3/0VwY1KSWIQKSZ7U+YlmUMx0i8xoW7NWyjgBrNe3L/HnVZi4Ku6LZrsAF2gF 1DjKkgbUD46s25gdRbsthB9ZKHcwMD2Kz2hfYjvzp1KNNoJxbqMcNMmhEFO+Gr51pq ecUl9tZOzzQR6w9opI5NTaWVeIYwQYtlMu4LWKFyTF1MqXBW97fMF714JB/oWyeiO5 rZxlsOqaJ73tSRcuGelVCZxhBg/fQvl3AVhF0At2f8PTHsdYX9KxL3Zb4UQcpmXyis eLd1k4eZDHnzA== Date: Fri, 18 Jun 2021 18:33:16 +0200 From: Mauro Carvalho Chehab To: Steven Rostedt Cc: Geert Uytterhoeven , Matthew Wilcox , James Bottomley , Laurent Pinchart , Shuah Khan , Konstantin Ryabitsev , "Enrico Weigelt, metux IT consult" , David Hildenbrand , Greg KH , Christoph Lameter , "Theodore Ts'o" , Jiri Kosina , ksummit@lists.linux.dev, Linux Kernel Mailing List , linux-block@vger.kernel.org, Linux FS Devel , Linux MM , netdev , Linux-Arch , Linux API Subject: Re: Maintainers / Kernel Summit 2021 planning kick-off Message-ID: <20210618183316.33766f1e@coco.lan> In-Reply-To: <20210618113452.7ab0033e@oasis.local.home> References: <5038827c-463f-232d-4dec-da56c71089bd@metux.net> <20210610182318.jrxe3avfhkqq7xqn@nitro.local> <20210610152633.7e4a7304@oasis.local.home> <37e8d1a5-7c32-8e77-bb05-f851c87a1004@linuxfoundation.org> <20210618103214.0df292ec@oasis.local.home> <20210618113452.7ab0033e@oasis.local.home> X-Mailer: Claws Mail 3.17.8 (GTK+ 2.24.33; x86_64-redhat-linux-gnu) X-Mailing-List: ksummit@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Em Fri, 18 Jun 2021 11:34:52 -0400 Steven Rostedt escreveu: > On Fri, 18 Jun 2021 17:29:04 +0200 > Geert Uytterhoeven wrote: > > > W.r.t. the other speaker in the room, isn't that similar to the normal mic, > > and can't that be handled at the receiving side? > > There will be a bit more delay involved, though. > > How many times have you been in a conference where the normal mic and > speaker caused a nasty feedback loop? I never used, but there are some devices that can work as automatic feedback suppressors. They basically detect a feedback loop and add notch filter(s) to the frequency(ies) that are looping. Some high-end digital mixers have this feature embedded (but the operator may need to enable it). Yet, you may still hear the feedback loop while the algorithm is detecting and correcting the issue, as it takes 100 ms to 400ms to detect and filter a single feedback frequency. > I'm not sure how well phone mics and room speakers will work. I guess that this depends on how the environment is setup. A good digital mixer can be set with a gate threshold. If the volume is below the threshold, the mic will be muted. They can also be setup to have just one microphone group, where only one microphone will have the volume raised on a given time. So, if someone speaks on a mic, all the others are muted or attenuated. Yet, I guess this is not the usual "package" provided by hotels. Those setups may require extra devices and technical people that knows now to use such features. Thanks, Mauro