Re: [linux-audio-user] All-Soft audio question

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Subject: Re: [linux-audio-user] All-Soft audio question
From: Aaron Trumm (aaron_AT_nquit.com)
Date: Fri Apr 30 2004 - 04:51:30 EEST

Well, I'm running nearly a month behind, and it's just about May 1...

----- Original Message -----
From: "Malcolm Baldridge" <linux-audio_AT_paypc.com>
To: "Linux audio users" <linux-audio-user_AT_music.columbia.edu>; "Aaron Trumm"
<aaron_AT_nquit.com>
Sent: Thursday, April 29, 2004 4:35 PM
Subject: Re: [linux-audio-user] All-Soft audio question

>
> > Also, if I could also be pointed toward a way to encode my 96khz wave
> > files at 92, 89, 43.2 and 5000.66 KhZ that would be great...
>
> I'm unclear about what you mean exactly.
>
> By 96Khz, do you mean 96Khz sampling rate? Or do you mean a bitrate,
> implying some compression.
>
> You can use sox to do sample conversion using any of three different
> techniques. Your given "rate" figures look a bit strange... 5000.66Khz?!
>
> Please be explicitly clear about what you're talking about.
>
> The only commonly used sampling rates I've heard of are (all in KHz):
>
> 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48, 96.
>
> I don't know what 89, 43.2, 92, or 5,000.66KHz would be useful for.
>
> As for bitrate selections, you have more choices with "MPEG 2"
>
> Official "ISO-approved" bitrates are as follows:
>
> For MPEG1 (sampling frequencies of 32, 44.1 and 48 kHz)
> n = 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320
>
> For MPEG2 (sampling frequencies of 16, 22.05 and 24 kHz)
> n = 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160
>
> For what it's worth, I've found the following LAME encoder settings to
> produce optimally sized and perfect-quality speaker recognition
compressions
> of phone recordings:
>
> #!/bin/bash
> declare -i newscaleint
> newscale=`sox "$2.wav" -e stat -v 2>&1 | cut -b1-4`
> newscaleint=`echo ${newscale} | cut -f1 -d\.`
> if [ ${newscaleint} -gt 20 ] ; then newscale="20.0"; fi
> if [ "${newscale}" == "1.00" ] ; then
> {
> lame -q 2 -h --vbr-new -b 8 -B 32 "$2.wav" "$2.mp3"
> }
> else
> {
> lame -q 2 -h --vbr-new --scale $newscale -b 8 -B 32 "$2.wav" "$2.mp3"
> }
> fi
>
> You can skip the sox pass if you don't care about normalising the samples.
>
> =MB=
>
> --
> A focus on Quality.
>

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