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Re: Sampling digital audio for computer analysis

Subject: Re: Sampling digital audio for computer analysis
From: Gianni Pavan <>
Date: Fri, 30 May 2003 06:11:06 -0700
<tt>just few notes about transferring DAT recordings to a PC...</tt><br>
 <tt>Many sound boards and external audio devices (USB, FireWire) have digital 
 IO capabilities to transfer a digital recording to a file.</tt><br>
 <tt>Though, it is important to carefully verify the digital I/O capabilities 
 the board you use: some devices - even expensive - don't perform direct 
 digital transfer of data but they do perform a real-time sampling rate 
 conversion (SRC). This might be sometimes useful, for example to downsample 
 to 44.1kHz a 48kHz DAT recording for CD mastering purposes. Unfortunately, 
 in these devices, sample rate conversion may occur even if transferring a 
 48kHz DAT recording to a 48kHz sound file!! This unnecessary data 
 conversion introduces artifacts that in most cases are not relevant, though 
 it is preferable to avoid them. To preserve the quality of the original 
 data the sound boards should lock on the incoming sample rate to transfer 
 samples to the PC as they arrive, without any sample rate conversion.<br>
 Often sound boards' documentation does not provide information about this 
 feature and only an accurate test can show if SRC occurs.</tt><br>
 <tt>To find cheap cables for digital IO with SONY D7-D8 and others, I suggest 
 to visit<br></tt><br>
 <tt>At 10.48 24/05/2003 +0100, you wrote:
 </tt><blockquote style="border-left: #0000FF solid 0.1em; margin: 0em; 
padding-left: 1.0em"><pre style="margin: 0em;">Received: from (
         by (8.9.3p2/8.9.3) with ESMTP id FAA22389
 As everyone is talking about their equipment at the moment I thought the
 following might be of interest:</pre><br>
 <pre style="margin: 0em;">Transferring your beautiful DAT data to PC for 
review, analysis, creating
 "new age" CDs, whatever...</pre><br>
 <pre style="margin: 0em;">The Soundblaster Audigy Platinum soundcard has SPDIF 
and optical input and
 output and is an affordable add-on (alternative soundcard actually) for any
 desktop/tower PC with free PCI slots (
 <a  href=""; 
rel="nofollow"></a> ).  Audiowerk 8 
by Emagic is a
 dedicated card for recording and producing multitrack sound which also has
 excellent SPDIF input and output facilities - think it might have been
 discontinued however as can't find any for sale.  Shame. If anyone would
 like to play with one, I have a spare, but I'd recommend the Audigy for ease
 of use any day.</pre><br>
 <pre style="margin: 0em;">For many, the Sony Datman range is still the 
recorder of choice for many (I
 use a TCD7, current model is TCD10 -
 <a  href=""; 
rel="nofollow"></a> ).  
 this model has a non-standard SPDIF port and you need to spend a fortune
 buying one from SONY, unless you deal with an alternative vendor like:
 neCables.  I bought mine off someone else, based in the USA, who makes them
 even cheaper (and really cheap optical cables too) but I can't find the
 invoice.  If anyone is interested in this kind of product, please send me a
 personal email and I'll dig out the information ([EMAIL PROTECTED]).</pre><br>
 <pre style="margin: 0em;">Howie Watkins
 Gower Marine Mammal Project
 Sound Recordist</pre><br>
 <pre style="margin: 0em;">--
 Frustra fit per plura quod potest fieri per pauciora.
 William of Ockham (ca. 1286 - 1347)
 Gianni Pavan
 Centro Interdisciplinare di Bioacustica e Ricerche Ambientali
 Universita' degli Studi di Pavia
 Via Taramelli 24, 27100 PAVIA, ITALIA
 Tel/Fax   +39-0382-525234
 Web       <a  href=""; 

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