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Recording anything in windows of any length (beyond 30 min or so)
requires a tremendous amount of activity (mostly disk writes). For
example, a 1 minute block of audio at 44.1kHz, 16 bit, stereo is
approximately 10 MB in overall size. Granted you can record at lower
fidelity/sample rates and mono which will reduce the overall filesize.
However, when in the heat of battle, I=92d sure hate for you to lose
contacts because your machine runs out of umph while trying to record at
the same time. =20
My suggestion (and it=92s what I do) is to locate a video cassette
recorder in your shack. Using the audio inputs (line level) record from
your rig. The =93speaker out=94 isn=92t line level so be careful of your
volume so you don=92t end up overdriving the VCR=92s lack of limiting
potential on the input. By doing this, you can record upto 6 hours of
audio on a comparatively HIGH fidelity VCR tape. That=92s 4 tapes =
during
a 24 hour contest.
Once the contest is over, you can then go back to your machine, use a
program like Sound Recorder (though I prefer Cool Edit) to commit the
audio to hard-drive using whichever compression scheme you wish. Once
you have a source wav file (let=92s use the 44.1, 16bit, stereo example)
you can then use: A: a plug-in with cool edit to covert it to an mp3
OR B: an external program like MusicMatch to do the conversion to mp3.
A one minute wav file at 44.1, 16bit, stereo in mp3 format is 1MB as an
mp3.
Now=85 if you=92d like to play it back in a conventional CD player, =
you=92ll
likely need the original 44.1, 16 bit, stereo or mono source wav file
for burning as a music track. Alternatively, you can record it as data
(mp3 files) for playback in a device capable of mp3 playback.
Final thought=85 a CD Rom will generally allow up to 650MB of data, or
70minutes of music source. Choose your plan accordingly.
I generally record them as music so that I can have them available for
other people to listen to with minimal effort. Also it helps to use
CD-R disks when recording, as opposed to CD-RW disks. Conventional CD
players do not like the muti-session disk format of CD-RW.
Hope that helps=85
Kevin Brown, KC0CZI
=20
=20
=20
Some people (W2UP, K3WW) have mentioned using MPEG level 3 which could
record the entire contest in under 400MB. This has the added benefit of
fitting on a CD for more permanent archive. However, I do not have an
MPEG choice under Writelog for compression options. Is this a function
of Writelog or the sound card I am using?
Assuming that I cannot use MPEG, what other settings have other people
used successfully that could fit in 800MB. This is about 4KB/sec
I have tried a few and one of the Microsoft ADPCM options sounded best
for 4KB/Sec. I suppose another option is to record it with high quality
and try to compress it afterwards with software but I suspect that will
be a long job.
Thanks for your help,=20
Tom W2SC (8P5A or 8P1A next weekend)=20
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<p><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:
Arial;color:navy'>Recording anything in windows of any length (beyond 30 =
min or
so) requires a tremendous amount of activity (mostly disk writes).<span
style=3D'mso-spacerun:yes'>=A0 </span>For example, a 1 minute block of =
audio at <span
class=3DGramE>44.1kHz</span>, 16 bit, stereo is approximately 10 MB in =
overall
size.<span style=3D'mso-spacerun:yes'>=A0 </span>Granted you can record =
at lower
fidelity/sample rates and mono which will reduce the overall <span
class=3DSpellE>filesize</span>.<o:p></o:p></span></font></p>
<p><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:
Arial;color:navy'>However, when in the heat of battle, I’d sure =
hate for
you to lose contacts because your machine runs out of <span =
class=3DSpellE>umph</span>
while trying to record at the same time.<span =
style=3D'mso-spacerun:yes'>=A0
</span><o:p></o:p></span></font></p>
<p><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:
Arial;color:navy'>My suggestion (and it’s what I do) is to locate =
a video
cassette recorder in your shack.<span style=3D'mso-spacerun:yes'>=A0 =
</span><span
class=3DGramE>Using the audio inputs (line level) record from your =
rig.</span> The
“speaker out” isn’t line level so be careful of your =
volume
so you don’t end up overdriving the VCR’s lack of limiting
potential on the input.<span style=3D'mso-spacerun:yes'>=A0 </span>By =
doing this,
you can record <span class=3DSpellE>upto</span> 6 hours of audio on a
comparatively HIGH fidelity VCR tape.<span =
style=3D'mso-spacerun:yes'>=A0 </span>That’s
4 tapes during a 24 hour contest.<o:p></o:p></span></font></p>
<p><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:
Arial;color:navy'>Once the contest is over, you can then go back to your
machine, use a program like Sound Recorder (though I prefer Cool Edit) =
to
commit the audio to hard-drive using whichever compression scheme you
wish.<span style=3D'mso-spacerun:yes'>=A0 </span>Once you have a source =
wav file
(let’s use the 44.1, 16bit, stereo example) you can then use:<span
style=3D'mso-spacerun:yes'>=A0 </span>A: a plug-in with cool edit to =
covert it to
an mp3<span style=3D'mso-spacerun:yes'>=A0=A0=A0 </span><span =
class=3DGramE>OR<span
style=3D'mso-spacerun:yes'>=A0 </span>B</span>: an external program like =
MusicMatch
to do the conversion to mp3.<o:p></o:p></span></font></p>
<p><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:
Arial;color:navy'>A one minute wav file at 44.1, 16bit, stereo in mp3 =
format is
1MB as an mp3.<o:p></o:p></span></font></p>
<p><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:
Arial;color:navy'>Now… if you’d like to play it back in a
conventional CD player, you’ll likely need the original 44.1, 16 =
bit,
stereo or mono source wav file for burning as a music track.<span
style=3D'mso-spacerun:yes'>=A0 </span>Alternatively, you can record it =
as data (mp3
files) for playback in a device capable of mp3 =
playback.<o:p></o:p></span></font></p>
<p><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:
Arial;color:navy'>Final thought… a CD Rom will generally allow up =
to
650MB of data, or 70minutes of music source.<span =
style=3D'mso-spacerun:yes'>=A0
</span>Choose your plan accordingly.<o:p></o:p></span></font></p>
<p><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:
Arial;color:navy'>I generally record them as music so that I can have =
them available
for other people to listen to with minimal effort.<span
style=3D'mso-spacerun:yes'>=A0 </span>Also it helps to use CD-R disks =
when
recording, as opposed to CD-RW disks.<span =
style=3D'mso-spacerun:yes'>=A0
</span>Conventional CD players do not like the <span =
class=3DSpellE>muti</span>-session
disk format of CD-RW.<o:p></o:p></span></font></p>
<p><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:
Arial;color:navy'>Hope that helps…<o:p></o:p></span></font></p>
<p><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:
Arial;color:navy'>Kevin Brown, KC0CZI<o:p></o:p></span></font></p>
<p><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:
Arial;color:navy'><o:p> </o:p></span></font></p>
<p><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:
Arial;color:navy'><o:p> </o:p></span></font></p>
<p style=3D'margin-left:.5in'><font size=3D2 color=3Dnavy =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p>=
</span></font></p>
<p style=3D'margin-left:.5in'><font size=3D2 face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial'>Some people (W2UP, K3WW) have mentioned using =
MPEG
level 3 which could record the entire contest in <span =
class=3DGramE>under</span>
400MB. This has the added benefit of fitting on a CD for more =
permanent
archive. However, I do not have an MPEG choice under Writelog for
compression options. Is this a function of Writelog or the sound =
card I
am using?</span></font><o:p></o:p></p>
<p style=3D'margin-left:.5in'><font size=3D2 face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial'>Assuming that I cannot use MPEG, what other =
settings
have other people used successfully that could fit in 800MB. This =
is
about 4KB/sec</span></font><o:p></o:p></p>
<p style=3D'margin-left:.5in'><font size=3D2 face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial'>I have tried a few and one of the Microsoft =
ADPCM
options sounded best for 4KB/Sec. I suppose another option is to =
record
it with high quality and try to compress it afterwards with software but =
I
suspect that will be a long job.</span></font><o:p></o:p></p>
<p style=3D'margin-left:.5in'><font size=3D2 face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial'>Thanks for your help,</span></font> =
<o:p></o:p></p>
<p style=3D'margin-left:.5in'><font size=3D2 face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial'>Tom W2SC (8P5A or 8P1A next =
weekend)</span></font> <o:p></o:p></p>
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