From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Matt Flax Newsgroups: gmane.comp.audio.sox.devel Subject: Re: 64bit audio read and write Date: Wed, 6 Jul 2016 22:16:48 +1000 Message-ID: <577CF6B0.2010107@flatmax.org> References: <577C4A9A.2000105@flatmax.org> <20160706072934.GA24278@dcvr.yhbt.net> <577CD611.80007@flatmax.org> Reply-To: sox-devel@lists.sourceforge.net NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: quoted-printable X-Trace: ger.gmane.org 1467807444 10419 80.91.229.3 (6 Jul 2016 12:17:24 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 6 Jul 2016 12:17:24 +0000 (UTC) Cc: sox-devel@lists.sourceforge.net To: =?UTF-8?B?TcOlbnMgUnVsbGfDpXJk?= Original-X-From: sox-devel-bounces@lists.sourceforge.net Wed Jul 06 14:17:03 2016 Return-path: Envelope-to: gcasd-sox-devel@m.gmane.org X-ACL-Warn: X-Authority-Analysis: v=2.1 cv=ZKcq4iPb c=1 sm=1 tr=0 a=j2gF+hSnfl5JSr2jVBK1AQ==:117 a=j2gF+hSnfl5JSr2jVBK1AQ==:17 a=L9H7d07YOLsA:10 a=9cW_t1CCXrUA:10 a=s5jvgZ67dGcA:10 a=N659UExz7-8A:10 a=xqWC_Br6kY4A:10 a=cAmyUtKerLwA:10 a=quVeovP3AAAA:8 a=ynJY_OTsAAAA:8 a=VAnFz-8b3ABR71VXVgYA:9 a=pILNOxqGKmIA:10 a=AZ-0r2VTK9MkIlfBvydC:22 a=YmV0Hfiy1jQgOKDU6WiB:22 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0 In-Reply-To: X-Spam-Score: -1.0 (-) X-Spam-Report: Spam detection software, running on the system "meb", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see @@CONTACT_ADDRESS@@ for details. =?ISO-8859-1?q?Content=20preview=3A=20=20On=2006=2F07=2F16=2021=3A41=2C=20?= =?ISO-8859-1?q?M=E5ns=20Rullg=E5rd=20wrote=3A=20=3E=20Matt=20Flax=20=3Cfl?= =?ISO-8859-1?q?atmax=40flatmax=2Eorg=3E?= writes: > >> On 06/07/16 17:29, Eric Wong wrote: >>> I'm not up-to-date with the latest technology, but even 32-bit >>> is far beyond the range of human hearing; and last I checked; >>> available ADC/DACs can't even make full use of 24-bit (nor >>> our ears). >> 120 dB SPL (threshold of discomfort) is around 20 billion times louder >> then 20 dB SPL (a whisper). That is approximately 24 bits. >> However, we can hear down to 10 dB SPL, or lower for young people ... >> that is approximately 40 bits of dynamic range. > 120 dB is outright painful and damages the ears. 100 dB is already > unpleasant. > > You should also check your calculations. With your limits, the required > dynamic range would be 110 dB, which comes out to 20 bits with a bit of > margin. > http://www.nal.gov.au/images/diagram-of-noise.jpg Anything above 75 dB SPL has potential to damage your hearing, depending on exposure time. The fact that we can hear with clarity over such large dynamic range is extraordinary isn't it ! [...] Content analysis details: (-1.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -1.0 ALL_TRUSTED Passed through trusted hosts only via SMTP X-Spam-Score: 0.0 (/) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. X-Headers-End: 1bKllD-00023l-G1 X-BeenThere: sox-devel@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: sox-devel-bounces@lists.sourceforge.net Xref: news.gmane.org gmane.comp.audio.sox.devel:493 Archived-At: Received: from lists.sourceforge.net ([216.34.181.88]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1bKllH-0005Y8-Jk for gcasd-sox-devel@m.gmane.org; Wed, 06 Jul 2016 14:17:03 +0200 Received: from localhost ([127.0.0.1] helo=sfs-ml-1.v29.ch3.sourceforge.com) by sfs-ml-1.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1bKllF-0004sU-Ho; Wed, 06 Jul 2016 12:17:01 +0000 Received: from sog-mx-3.v43.ch3.sourceforge.com ([172.29.43.193] helo=mx.sourceforge.net) by sfs-ml-1.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1bKllF-0004sP-9M for sox-devel@lists.sourceforge.net; Wed, 06 Jul 2016 12:17:01 +0000 Received: from nschwmtas03p.mx.bigpond.com ([61.9.189.143]) by sog-mx-3.v43.ch3.sourceforge.com with esmtps (TLSv1:AES256-SHA:256) (Exim 4.76) id 1bKllD-00023l-G1 for sox-devel@lists.sourceforge.net; Wed, 06 Jul 2016 12:17:01 +0000 Received: from nschwcmgw07p ([61.9.190.167]) by nschwmtas03p.mx.bigpond.com with ESMTP id <20160706121651.EOTE2051.nschwmtas03p.mx.bigpond.com@nschwcmgw07p>; Wed, 6 Jul 2016 12:16:51 +0000 Received: from meb ([124.190.105.82]) by nschwcmgw07p with BigPond Outbound id FQGr1t00B1mhCic01QGrYB; Wed, 06 Jul 2016 12:16:51 +0000 Received: from localhost ([::1] helo=[127.0.0.1]) by meb with esmtp (Exim 4.84_2) (envelope-from ) id 1bKlod-0007Sb-6F; Wed, 06 Jul 2016 22:20:33 +1000 On 06/07/16 21:41, M=E5ns Rullg=E5rd wrote: > Matt Flax writes: > >> On 06/07/16 17:29, Eric Wong wrote: >>> I'm not up-to-date with the latest technology, but even 32-bit >>> is far beyond the range of human hearing; and last I checked; >>> available ADC/DACs can't even make full use of 24-bit (nor >>> our ears). >> 120 dB SPL (threshold of discomfort) is around 20 billion times louder >> then 20 dB SPL (a whisper). That is approximately 24 bits. >> However, we can hear down to 10 dB SPL, or lower for young people ... >> that is approximately 40 bits of dynamic range. > 120 dB is outright painful and damages the ears. 100 dB is already > unpleasant. > > You should also check your calculations. With your limits, the required > dynamic range would be 110 dB, which comes out to 20 bits with a bit of > margin. > http://www.nal.gov.au/images/diagram-of-noise.jpg Anything above 75 dB SPL has potential to damage your hearing, = depending on exposure time. The fact that we can hear with clarity over = such large dynamic range is extraordinary isn't it ! I think the point I am making is that you can't capture 64 bit words of = data in audio files with only 32 bit word reads/writes from file. I = wasn't aware that sox didn't have any methods for 64 bit audio data file = read and writes. From a pure data perspective, no qualms right ? Matt ---------------------------------------------------------------------------= --- Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San Francisco, CA to explore cutting-edge tech and listen to tech luminaries present their vision of the future. This family event has something for everyone, including kids. Get more information and register today. http://sdm.link/attshape