In message <u481ur$mufp$
1@dont-email.me> at Fri, 19 May 2023 15:39:36,
NY <
me@privacy.invalid> writes
"J. P. Gilliver" <G6JPG@255soft.uk> wrote in message >news:eZL97LX7J0ZkFwAZ@255soft.uk...
[]
But the sound would not have been coming from the cassette recorder's >>speaker, would it - or were you monitoring, and using a very long mike
lead to avoid feedback? Most portable cassette machines mute the
speaker on record, at least when recording from a microphone. So
unless the TV was also running on battery ...
I wasn't implying that the sound was coming from the speaker *during
the recording*. I was meaning that when the tape was played back
afterwards, the pitch rose during loud sounds which equates to the
motor slowing down at those points during recording - assuming that on >playback the motor is able to run at constant speed.
Hmm. Although another has said the record current rises a _little_ with
large amplitude signals, I'd be surprised if it would have a noticeable
effect. (Having said that, I can't otherwise explain what you describe.)
[]
Was this just an intellectual thought, or is it a recording you'd
really like to retrieve: in other words, what was/is the music? We
can probably find you a recording; virtually everything is on YouTube >>these days (-:!
It's an intellectual thought-experiment. I think the music may have
been from the testcard ;-) I'd be impressed if I ever managed to
identify it on a compilation of library music.
I suspected as much, and am enjoying the discussion. But if you do seek
it: "The test card circle" put out a CD not _too_ long ago (meaning
somewhere in the last couple of decades, I think!) of "test card music", arguing that some of it was of unrecognised (by the general public) high quality and should not be lost. (Technically, they had a point. Of
course, I bought the CD - but can't say I can at this point think of
anything on it I consider the musical equivalent of deathless prose.)
And now I think about it, I may have recorded from an old 405-line TV,
so the whistle would have been at 10125 rather than 15625 Hz. Either
And as well as being more within normal hearing range anyway, tended to
be louder for various reasons - components looser, especially when
thermal cycling has had its effect.
way, when I generated a live spectrum of the digital recording made
from the tape, there was a clear peak at around one frequency or the
other, and when I generated an offline spectrum of a few seconds of
*stable* recording (ie not when it was wowing all over the place), the
peak narrowed enough to be able to say that it was close to one value
or the other. That was using CoolEdit software, though I imagine that >Audacity can do something similar.
(I think almost any audio processing software has such a function; I use GoldWave, since I bought it before Audacity came out and am used to it.)
It's a long time since I noticed the problem. I don't know which tape
it was recorded on or where the digital WAV file of it is.
--
J. P. Gilliver. UMRA: 1960/<1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf
A perfectionist takes infinite pains and often gives them to others
--- SoupGate-Win32 v1.05
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