From nobody Sun May 16 22:27:32 2021
X-Original-To: freebsd-multimedia@mlmmj.nyi.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1])
	by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 7042A84F3E6
	for <freebsd-multimedia@mlmmj.nyi.freebsd.org>; Sun, 16 May 2021 22:28:28 +0000 (UTC)
	(envelope-from evgeniy@khramtsov.org)
Received: from mxa.khramtsov.org (mxa.khramtsov.org [IPv6:2a0a:e5c0:2:10f::f])
	(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
	 key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256)
	(Client did not present a certificate)
	by mx1.freebsd.org (Postfix) with ESMTPS id 4Fjxk374x6z4bRY
	for <freebsd-multimedia@freebsd.org>; Sun, 16 May 2021 22:28:27 +0000 (UTC)
	(envelope-from evgeniy@khramtsov.org)
Received: from mxa.khramtsov.org (mxa.khramtsov.org [IPv6:2a0a:e5c0:2:10f::f])
	by mxa.khramtsov.org (Postfix) with ESMTP id 4238B125EC1;
	Sun, 16 May 2021 22:26:42 +0000 (UTC)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=khramtsov.org;
	s=rsa; t=1621204002;
	h=from:from:reply-to:subject:subject:date:date:message-id:message-id:
	 to:to:cc:cc:mime-version:mime-version:content-type:content-type:
	 in-reply-to:in-reply-to:references:references;
	bh=8p6rmkqpgEJpg4LEL4hgIO/ORuFuP/ku6urPXwIfytQ=;
	b=eqhwJEUTOtezyiVGW8OOHTrZ9xHHEsP6fXhQci6RAwPB8luO4kw7fb8zRP+YqtKujMYnCg
	PWR6jhSQUNaFYWeA1RyVuyFjnsehLgnEJxjPJ2Kg/uoTowkXcxmV4aQhpL1L4dA5WudGxa
	fROqd6mlBzIYPdA5HEw3at7GBIvcdGpsSbfe8bA1Yx9xbuJx5CaEVmwNjd3MBi2OknvwHk
	JzmCWJZXrtuxQlU/T2yd+Q/nQ/+KRc+WMPbI6vqu1ebr58V6DDIq+smCDUaRu0H02nNGKL
	Xc+VZbmnMb0d3BAdnvGtwJ1iSsg3f2CaMF2a4ZjaP4z530MIY3N4j5UQwJKLDQ==
Date: Mon, 17 May 2021 01:27:32 +0300
To: Hans Petter Selasky <hps@selasky.org>
Cc: freebsd-multimedia@freebsd.org
Subject: Re: Silent noise while running simple OSS program and moving mouse?
Message-ID: <YKGcVP5DNLDzVzsC@vax.khramtsov.org>
References: <YKGWO6L9NTikr1ZI@vax.khramtsov.org>
 <b18ca6ae-4754-2d52-3a16-b8835471fa54@selasky.org>
List-Id: Multimedia discussions <freebsd-multimedia.freebsd.org>
List-Archive: http://lists.freebsd.org/multimedia
List-Help: <mailto:multimedia+help@freebsd.org>
List-Post: <mailto:multimedia@freebsd.org>
List-Subscribe: <mailto:multimedia+subscribe@freebsd.org>
List-Unsubscribe: <mailto:multimedia+unsubscribe@freebsd.org>
Sender: owner-freebsd-multimedia@freebsd.org
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <b18ca6ae-4754-2d52-3a16-b8835471fa54@selasky.org>
X-Rspamd-Queue-Id: 4Fjxk374x6z4bRY
X-Spamd-Bar: ----
Authentication-Results: mx1.freebsd.org;
	none
X-Spamd-Result: default: False [-4.00 / 15.00];
	 REPLY(-4.00)[]
Reply-To: evgeniy@khramtsov.org
From: Evgeniy Khramtsov via freebsd-multimedia
	<freebsd-multimedia@freebsd.org>
X-Original-From: Evgeniy Khramtsov <evgeniy@khramtsov.org>

Well, it is the opposite of a professional one.

> qaudiosonar
> Start virtual_oss with EQ support to filter away the frequency.

I'll check both, thanks.

I thought that standard PC tuple with S16_LE / 44800 / stereo should
always work, maybe not...

Maybe stuff like SNDCTL_DSP_LOW_WATER and switching to non-blocking IO
may help, idk, I'll report if I resolve this myself.

Thanks.

On Mon, May 17, 2021 at 12:17:31AM +0200, Hans Petter Selasky wrote:
> Hi,
> 
> Are you using a professional balanced audio microphone? If no, then 
> information is leaking via ground on the mainboard :-(
> 
> Been there done that :-)
> 
> --HPS