Quote:
Originally Posted by Andy T.
the noise was in stereo. The track is mono! I don't know if I ever noticed that before.
I did get about as good a transfer as you can expect. Since it was in mono, I converted my stereo track to mono and made a mono MP3 from it. The way I mixed the two channels actually allowed me to get rid of a little bit more noise.
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excellent posting Quasimondo err umm "glutomodo"
(during our November 1999 excursion to Orilia I videotaped Andy telling me that glutomodo was a charactter on the Fireside theatre or something
Andy is number 8 in this famous photograph (back row in a palish blue jacket)
anotated picture as displayed in thread:-
http://www.corfid.com/ubb/Forum1/HTML/002292.html
Apologies to all for being a bit geekish here but Andy could you possibly explain how you went about making a "mono mp3"
I noted that you used VBR (Variable Bitrate Recording) and that the mp3 is only
2.02 MB which is evidently much smaller than one would expect for a 3+ minute full stereo mp3
(due to its being only mono of course so only one channel was recorded
I was able to analyse it using the very useful freeware utility MediaInfo from:-
http://mediainfo.sourceforge.net/en/Download
I have been using that nifty little program (1030KB) to find out the parameters of compressed divx video files and hovering the mouse over the mp3 filename as you can see reveals that the average bitrate was only 112 KBPS and that the mp3 does indeed comprise only one channel
I do actually have a very serious purpose in asking for information on your technique Andy
I had previously myself attempted to make a mono mp3 in order to make a mono CD since by having only one channel on the CD in theory one could get twice as much running time on the CD but all I could ever discover was that unless you were content to have sound coming out of one speaker only it was not possible as by definition CDs and their PCM/wav audio format were always stereo.
But why did I want to know?
As well as doubling the capacity of CD I had a purpose for making mono mp3s myself
Back in the bad old days before stereo broadcasting began either on radio or television and in any case a stereo tape recorder was beyond my budget I made many monaural tapes from either a radio or atelevision indeed one of my tapes (the great 1969
Chartlottetown Festival appearance by GL as broadcast in October that year in Montreal by the CBC) surfaced as a pretty impressive live CD.
And I know beyond any doubt that it was made from my original recording (as traded with other fans because there are 2 incomplete tracks on the CD that are identical to those on my tape (where the tape had simply ran out and it took time to rethread a replacement on to the recorder!!!)
Now a little history break kiddies
from a wiki
"The BBC made radio's first stereo broadcast in December 1925...The BBC repeated the experiment in 1926, using 2LO in London and 5XX at Daventry. Following experimental FM stereo transmissions in the London area in 1958 and regular Saturday morning demonstration transmissions using TV sound and medium wave (AM) radio to provide the two channels, the first regular BBC transmissions using an FM stereo signal began on the BBC's Third Programme network on August 28, 1962."
I can remember those 1960s BBC stereo experiments and still have the first stereo LP that my grandfather bought (filled with such wondrous recordings as a ping pong match;(the ball is on the right "ping" and now on the left "pong"!!)
OK end of my history break.Oh do shut up hooligan from Sydney
I have several interview recordings that contain music as well as speech and whilst it would be possible to digitise them to small audio files at sampling bitrate as low as say 32 KBPS (of course you all know don't you that the size of any digitally sampled audio file is directly and exactly proportional to the bitrate) the musical content would suffer too much
But if I could make monaural mp3s of them then the file sizes should be dramatically smaller (no not half because I believe that to some extent the mp3 compression algorithm compares the right and left channels and where possible only includes the same or nearly identical sound information once then then cross refers on playback but I might be wrong there)