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I was just reading in comp.os.linux.advocacy about this:
https://gwc.sourceforge.net/
did you know about that?
record click removal?
http://www.opensourcepartners.nl/~costar/gramofile/
I was just reading in comp.os.linux.advocacy about this:
https://gwc.sourceforge.net/
did you know about that?
record click removal?
and
http://www.opensourcepartners.nl/~costar/gramofile/
Have not tried any of that code.
In article <10c3ke8$13ub0$1@dont-email.me>,
Jan Panteltje <alien@comet.invalid> wrote:
I was just reading in comp.os.linux.advocacy about this:
https://gwc.sourceforge.net/
did you know about that?
record click removal?
I used that one some years ago - in fact I made some suggestions
for improvement in the algorithms.
I don't know whether it will "build" these days, given the changes
in the GUI toolkits over the years.
http://www.opensourcepartners.nl/~costar/gramofile/
That's another one I used years ago... and again, it might or might
not be capable of being compiled using current libraries.
The Audacity sound editor has somewhat similar capabilities...
automated crackle removal, and semi-manual "point out the glitch
and it'll repair the waveform" fix-up for individual pops and
ticks. I used it recently to do some cleanup on the transcription
of an old LP from my collection, and the results were quite good.
Jan Panteltje <alien@comet.invalid> wrote:
I was just reading in comp.os.linux.advocacy about this:
https://gwc.sourceforge.net/
did you know about that?
record click removal?
and
http://www.opensourcepartners.nl/~costar/gramofile/
Have not tried any of that code.
There are a lot of software products on the market but they have two
major failings:
1) They don't work in real time, so it is impossible to optimise the >mechanical settings whilst listening to the results. If the mechanical >settings are wrong, no amount of clever software can put the sound
right.
2) Many of them are designed to deal with single clicks (e.g. from a >scratched vinyl L.P.) and cannot cope with the hail of crackles from a
poor shellac pressing.
The real-time aspect was important last weekend: I was playing-in
examples for presentations at the A.G.M. of a national gramophone
society. Most of the records only arrived on my table 15 minutes before
the presentation started, although I had been told in advance what they
would be. The one of the presenters produced a record she had just been >given and asked if that could be included too.
In the evening, people brought along records they would like to hear, so
I only had a few minutes to look at each disc and work out what settings >would suit it. (No normal 78s used the R.I.A.A. recording
characteristic, so I had to work out what characteristics to use for
each one.) Most were lateral recordings but a few were
vertically-modulated. Several were 80 rpm and one was 66 rpm.
There is no way software with batch processing or even noticeable
latency could have been used for that job.
But then, you'd need to digitize the audio first.
For vertical needle movement a stereo pickup element with left an right in series should work?
Just guessing :-)
Jan Panteltje <alien@comet.invalid> wrote:
[...]
But then, you'd need to digitize the audio first.
Aye, there's the rub! No time to do that in front of an audience.
For vertical needle movement a stereo pickup element with left an right in >> series should work?
Just guessing :-)
You guessed correctly - or they could be connected in parallel as long
as the relative polarity was correct in each case. For coping with a
mix of records it is much more convenient to have sum and difference
op-amps permanently connected, then switch between them. For
convenience the switching is incorporated into the equaliser:
http://www.poppyrecords.co.uk/other/Turntables/parallel-tracker.htm
The variable mid-frequency turnover for mono is achieved by adding a >proportion of the integrated signal to the direct signal. This avoids
the gain changes that would occur if you attempted to do it with
variable feedback around an op-amp.
Jan Panteltje <alien@comet.invalid> wrote:
[...]
But then, you'd need to digitize the audio first.
Aye, there's the rub! No time to do that in front of an audience.
For vertical needle movement a stereo pickup element with left an right in >> series should work?
Just guessing :-)
You guessed correctly - or they could be connected in parallel as long
as the relative polarity was correct in each case. For coping with a
mix of records it is much more convenient to have sum and difference >op-amps permanently connected, then switch between them. For
convenience the switching is incorporated into the equaliser:
http://www.poppyrecords.co.uk/other/Turntables/parallel-tracker.htm
Very nice.
The variable mid-frequency turnover for mono is achieved by adding a >proportion of the integrated signal to the direct signal. This avoids
the gain changes that would occur if you attempted to do it with
variable feedback around an op-amp.
Interesting, what does this symbol stand for,
|=|
connected to the 600 Ohm resistors and cable screen and ground at he other end I suppose? feed-through capacitors?
Jan Panteltje <alien@comet.invalid> wrote:
Jan Panteltje <alien@comet.invalid> wrote:
[...]
But then, you'd need to digitize the audio first.
Aye, there's the rub! No time to do that in front of an audience.
For vertical needle movement a stereo pickup element with left an right in
series should work?
Just guessing :-)
You guessed correctly - or they could be connected in parallel as long
as the relative polarity was correct in each case. For coping with a
mix of records it is much more convenient to have sum and difference
op-amps permanently connected, then switch between them. For
convenience the switching is incorporated into the equaliser:
http://www.poppyrecords.co.uk/other/Turntables/parallel-tracker.htm
Very nice.
The variable mid-frequency turnover for mono is achieved by adding a
proportion of the integrated signal to the direct signal. This avoids
the gain changes that would occur if you attempted to do it with
variable feedback around an op-amp.
Interesting, what does this symbol stand for,
|=|
connected to the 600 Ohm resistors and cable screen and ground at he other >> end I suppose? feed-through capacitors?
It's a non-polarised electrolytic capacitor. I always use the pre-war >German/Dutch symbol for electrolytics because it is more descriptive
than the British Standard symbol. The non-polarised symbol is like two >'Dutch' electrolytic capacitors back-to-back
I use a different symbol for feedthrough capacitors, you can see some in
the top row at:
http://www.poppyrecords.co.uk/Radio/G8HEH/2metretransceiver.htm#FRONTEND
The feedthrough symbols with the dashed lines are ferrite beads.
The cartridge pre-amp is a low-noise design that was first used by Bell
Labs for telephone line amplifiers in the 1920s, it has a combination of >current and voltage feedback to ensure the correct loading without the
need for a noise-generating and signal-wasting resistor. The idea was >revived by the BBC for their low-noise AMC/5 microphone pre-amplifier in
the 1950s. In most implimentations, including this one, it needs both
side of the input signal source to float - but I have produced a variant
that can work with a source that has one side earthed.
http://www.poppyrecords.co.uk/other/Turntables/parallel-tracker.htm
The cartridge pre-amp is a low-noise design that was first used by Bell >Labs for telephone line amplifiers in the 1920s, it has a combination of >current and voltage feedback to ensure the correct loading without the
need for a noise-generating and signal-wasting resistor. The idea was >revived by the BBC for their low-noise AMC/5 microphone pre-amplifier in >the 1950s. In most implimentations, including this one, it needs both
side of the input signal source to float - but I have produced a variant >that can work with a source that has one side earthed.
That 390 pF forms an LC network with the coil in the csrtrige?
1 MOhm feedback..
Spice time!
No idea wat the inductance and resistance of the csrtrige is
I used a Shure M44/7 in the sixties Before that some heavy dynamic thing
with a real needle for 78 rpm, Phlips too.
I was just reading in comp.os.linux.advocacy about this:
https://gwc.sourceforge.net/
did you know about that?
record click removal?