If you don't mind playing with open source stuff in the terminal, sox
has some noise reduction functions. You can find details here:
http://sox.sourceforge.net/sox.html
by searching for 'hiss' on that page. Basically you run a bit of your
recording which should be silent (other than the hiss) to make a filter
profile and then you use that profile to remove those same sounds from
the rest of the recording. Likewise there is a compressor filter called
"compand" which might help with your loud bit at the beginning.
CB
On 12/29/14 1:09 PM, BobH. wrote:
Well, don't know about tape hiss, but the burst level was done by an
auto-level on the tape that recorded it; took that long to determine level
and moderate it. I use Total Recorder by Highcriterion; can do some good
stuff and accessible, can do batch jobs and deal with normalisation as you
said. I tried to clean up scratchy LP's once, once was enough.
----- Original Message -----
From: "Mike Busboom" <[email protected]>
To: <[email protected]>
Sent: Monday, December 29, 2014 1:16 PM
Subject: Audio restoration of old cassettes
Greetings to all of you,
I have a large cassette library of recordings that I started making in the
early 70s, and I want to digitize them. I have already transferred many of
them to .wav files but for storage constraints, I already have converted
many of them, hiss, crackles and all, to MP3.
None of these cassettes was recorded in stereo; I didn’t even own a stereo
microphone at the time.
I recently purchased Amadeus Pro, and it has a built-in plug-in for dealing
with cassettes. However, I think I am screwing up on the normalization
process and what levels to set volume, etc. It is obvious that I am an
amateur at this. What I want to do is remove the hiss, as well as the loud
volume that occurs for about 1/10 second after a pause in the audio. Can
this be accomplished with Amadeus Pro as is, or do I need to buy something
else? One very helpful person who occasionally posts to this list,
recommended a program called RS, but he seemed to lament the company’s plans
for future versions, where accessibility is concerned. If Amadeus Pro will
do what I need, then I suspect that I wouldn’t need RS.
If anyone can give me the best parameters for working with Amadeus Pro or
thoughts using a different approach or different program, I’d be grateful.
Many thanks in advance,
Mike
--
¯\_(ツ)_/¯
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