[MPA] Noise reduction (was Re: Audio Interface Advice?)

David Crandon tabdave at comcast.net
Mon Feb 2 08:22:21 PST 2004

Hello Jay,

I disagree with you somewhat. The Phase Linear Autocorrelator Series II 
(and other Phase Linear pre-amps that had it) did a very decent job of 
getting rid of hiss. It used a dynamic three band high freq filter that 
was very effective. It wasn't completely without artifacts, but they 
were well worth the tradeoff when used appropriately.

The same was true of Dolby C...When used properly, it was very 
effective. But, unfortunately, to be used effectively, recording and 
playback levels had to be adjusted properly....Which was almost 
impossible unless you played back on the same machine you recorded it 

David Crandon

On Feb 2, 2004, at 8:12 AM, Jay Shaffer wrote:

> This delves into the art of recording. You've got to ask your self if 
> the artifacting is worth the noise reduction. It's the same with EQ is 
> losing the hiss worth cutting all the highs? Also with cassettes, many 
> were recorded with Gawdawful Dolby C that makes them almost 
> un-restorable to any semblance of quality.
> On the stuff that I transfer from cassette I just use Spin Doctor and 
> say "Hey, it's from cassette" Thankfully most of my stuff was archived 
> on VHS Hi-Fi or DAT.
> My tuppence worth.
> --
> Jay Shaffer
> Mac Audio Guy
> mag at macaudioguy.com
> http://macaudioguy.com/
> On Feb 1, 2004, at 1:24 PM, Joe Castleman wrote:
>> on January 23, Jay Shaffer wrote:
>>> Let me recommend Audacity as a sound editor for restoring your old
>>> 78RPMs it has a noise sampling and reduction effect ala Ray Gun and
>>> it's free.
>> I have a few cassettes that I recorded to my hard drive.  I was hoping
>> to clean up the tape hiss and gave Audacity a try.  It cleaned up the
>> hiss all right, but the softer passages (e.g., fade-outs, audience
>> noises) were distorted - I'm guessing it affected everything that was 
>> at
>> lower volume than the hiss itself.
>> The Audacity web site basically says there's no way to get around this
>> completely, and I just have to take my lumps.  I tried it with my old
>> copy of CD Spin Doctor, as well as a demo of Ionizer, and neither of
>> those worked well, either.
>> Anyone have a strategy for dealing with low-level sounds when 
>> attempting
>> noise reduction?
>> Thanx in advance,
>> --Joe C.
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