<P> Thanks for this Bill. I downloaded and putchased the Cool Edit 2000 package last night (8.25Mb) and used it to produce a new, longer, but smaller mp3 of Surfleet - 43sec, 299k - using your suggested settings. Previously I had been using the Creative Labs WaveStudio package (supplied with the soundcard) and Cakewalk Pyro to convert to mp3; this seems to be aimed at ripping CDs rather than proper file manipulation. Anyway, Cool Edit is very intuitive, and produces good results - particularly good is the range of plug-ins available. I recommend it to anyone!
<P>Complete revision of my sounds page looming...
<P> <B><I>oakcroft13 <bill@h...></I></B> wrote:
<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid"><TT>In answer to Alan's question: the software package I use for sound <BR>editing is Syntrillion's Cool Edit, which I have found very powerful. <BR>It is shareware, but you can download a trial version and use it for <BR>30 days (with restrictions) before you have to purchase it. It is <BR>available from www.syntrillion.com. Its most useful facilities are:<BR>* it can record via the PC soundcard from whatever recorder you use<BR>* it can record from a directly attached microphone, especially <BR>useful for laptops<BR>* it can translate between all the standard formats, especially .wav <BR>and .mp3<BR>* it has extensive capabilties for editing, transformation, selective <BR>amplification, enveloping, noise removal etc.<BR><BR>There are other packages too, I'm only recommending this one because <BR>I use it and it works. If you only wish to digitise recordings, not <BR>edit them, Windows Sound Recorder (free!) will work fine, but there <BR>are some tricks not covered in the documentation required to make it <BR>use the file format you want. Also, you may have to download a <BR>seperate mp3 codec.<BR><BR>(I apologise to Macintosh users that I am only covering PC work here, <BR>perhaps someone who understands Macs better could join in!)<BR><BR>As regards recording formats, I always record at 44,100 samples per <BR>second, 16 bit data, mono. This can lead to very large files <BR>(fortunately I have a big hard-drive!). When I add recordings to my <BR>database I reformat them as mp3, which gives a reduction in file-size <BR>of over ten times. I also edit out initial silence, trim the <BR>recordings to length, etc. I archive the big .wav files off to CD in <BR>case I ever need them again.<BR><BR>Here are some thoughts on recording formats.<BR><BR>Sampling rate: the Nyquist theorem, grossly summarised, says that you <BR>need to sample at double the maximum frequency present in the sound. <BR>In practice I find with recordings you need to go higher than that. <BR>To sample at 22,050 runs the risk of losing frequencies somewhat <BR>below 10 kHz. Therefore, I always use 44,100. Do NOT digitise at <BR>48,000 as some Windows drivers have bugs at this sampling rate.<BR><BR>Number of bits: 8 bit data gives disappointing results, 32 bit data <BR>is complete overkill and is not universally supported. Use 16 bit.<BR><BR>Number of channels: except for recordings in exceptional <BR>circumstances (e.g. recording a swinging bell close up) I do not <BR>believe stereo adds any value - save the disc space and use mono.<BR><BR>File format: .wav files using PCM format are guaranteed to give you <BR>back exactly what went in, but at the expense of large amounts of <BR>disc (over 5 Mbyte per minute).<BR>.wav files using the ADPCM format are also guaranteed to give you <BR>back almost exactly what went in, and are 25% of the size of PCM <BR>format files. In trials I conducted last year, I could detect no <BR>difference in the sound of PCM and ADPCM recordings. Disc usage is <BR>1.3 Mbyte / minute.<BR>.mp3 files are very compressed. The format I use (56k bits/sec on the <BR>Cool Edit menu) reduces file sizes by a factor of 12. If the original <BR>recording is high quality then this mp3 format gives moderately good <BR>reproduction. However, if the original recording is distorted (i.e. <BR>the bells were too loud for microphone or recorder), or there is a <BR>big wash of background harmonics, mp3 gives a very poor result. Disc <BR>usage is about 420 kByte / minute.<BR><BR>The only exception to the above rules, of course, is if the original <BR>recording is of such poor quality (e.g. severely bandwidth limited) <BR>that digitising at 44,100 is not warranted.<BR><BR>I've written enough now, more (if people think it is useful) in a <BR>follow-up post on recorders, microphones, loudness, distortion, and <BR>how to get Windows Sound Recorder to record and save in your chosen <BR>file format.<BR><BR>Bill H<BR><BR><BR><BR><BR></TT><BR><TT>This message was sent to you via the Bell Historians' Mailing List. To unsubscribe from the list send an email to email@example.com<BR><BR></TT><BR><BR><TT>Your use of Yahoo! Groups is subject to the <A href="http://docs.yahoo.com/info/terms/">Yahoo! Terms of Service</A>.</TT> <BR></BLOCKQUOTE><BR><BR><p><br><hr size=1><b>Do You Yahoo!?</b><br>
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