Pretty much the 'Holy Grail' of audio.I can't ever imagine there being a
software solution for those noise reduction systems as they were very level
sensitive... but i'd be really happy if i could be proven wrong..
Not long ago I made an extensive search for software that would
do at le
Not long ago I made an extensive search for software that would
do at least decoding of tape noise reduction systems. Practically
nothing found, no convolution based or VST:s. No Dolby, no DBX, not
even versions of single-ended analog NR, such as Philips DNL.
An earlier version of the Stereo Tool
On 01/05/2013 23:52, Sampo Syreeni wrote:
...
Still, do give me your definition of time-invariant. Perhaps there are
stronger definitions I haven't heard of yet, and which can be useful in
e.g. more fine grained analysis.
I have always understood it to mean that the behaviour is not depe
On 2013-05-01, Fons Adriaensen wrote:
As a technical nitpick, they are too: if you just shift a signal in
time, the output will be a shifted version of the original.
That corresponds to a very weak definition of 'time-invariant'...
I didn't think there could be but one: either it varies in t
On Thu, May 02, 2013 at 01:28:40AM +0300, Sampo Syreeni wrote:
> In this vein the starting point prolly would be the Moog ladder, in
> its nonlinear region. It's hideously complex for such a charming
> little thing.
It's a real gem of analog design. But at least in this case
the dependene on the
On 2013-05-01, Fons Adriaensen wrote:
The diode is not 'perfect', it will have some voltage drop depending
on the current flowing in it. The result may well be 'desirable', i.e.
in practice better than what would be obtained by using a 'perfect'
diode.
Perhaps the nastiest commonly used exam
On Thu, May 02, 2013 at 12:46:36AM +0300, Sampo Syreeni wrote:
> As a technical nitpick, they are too: if you just shift a signal in
> time, the output will be a shifted version of the original.
That corresponds to a very weak definition of 'time-invariant'...
Ciao,
--
FA
A world of exhausti
On Wed, May 01, 2013 at 04:29:46PM -0500, David Pickett wrote:
> At 16:02 01-05-13, Fons Adriaensen wrote:
>
> >The difficult part in writing any software emulation of the Dolby-A
> >or similar systems is modelling the dynamic behaviour of the compander,
> >not the actual audio processing. Such sy
On 2013-05-01, Fons Adriaensen wrote:
The point is that companders such as Dolby-A and Telcom are linear at
least over a short time span - they do not introduce distortion.
I started thinking about that as well. Yeah, if you put in all possible
spectra, in all combinations, at all speeds of c
At 16:02 01-05-13, Fons Adriaensen wrote:
>The difficult part in writing any software emulation of the Dolby-A
>or similar systems is modelling the dynamic behaviour of the compander,
>not the actual audio processing. Such systems will have 'designed' and
>documented attack/release times, but ana
On Wed, May 01, 2013 at 08:02:20PM +0300, Sampo Syreeni wrote:
> On 2013-05-01, Dave Hunt wrote:
>
> >Dolby A (etc.) decode. Would it not be possible to to do this with
> >convolution ?? Find a working unit, record its impulse response,
> >use that in one of the many convolution reverb/filter plug
On 2013-05-01, Dave Hunt wrote:
Dolby A (etc.) decode. Would it not be possible to to do this with
convolution ?? Find a working unit, record its impulse response, use
that in one of the many convolution reverb/filter plug-ins.
Unfortunately this is not an option. Convolution can be used to m
effect (e.g. on backing vocals).
Obviously the Dolby reference level would have to be taken into account.
Apologies if this is a completely hare-brained idea.
Dave Hunt
Date: Mon, 29 Apr 2013 21:56:30 -0500
From: David Pickett
Subject: Re: [Sursound] Sony PCM? (was Re: DTS Headphone:X)
A
True, the patent and JAES article are as usual not the full story. The only
problem with the second user stuff is whether the thing itself is working
properly. Access to a test rig would be useful - never used the 363 but
I've had a lot of experience with the earlier 361 unit which uses the CAT
22
On 30 Apr 2013, at 04:56, David Pickett wrote:
> A standalone Windows app that would decode Dolby-A encoded wavefiles and
> output
>a restored non-Dolby 24-bit wavefile would be most useful. I have several
>recordings that I have had transfer to hi-res files still in Dolby-A format.
> ... even
On 30 Apr 2013, at 04:56, David Pickett wrote:
> A standalone Windows app that would decode Dolby-A encoded wavefiles and
> output a restored non-Dolby 24-bit wavefile would be most useful. I have
> several recordings that I have had transfer to hi-res files still in Dolby-A
> format.
>
> ...
At 12:37 29-04-13, Kees de Visser wrote:
>Great idea though (same for a software Dolby A/SR decoder, which isn't
>avaialble AFAIK).
A standalone Windows app that would decode Dolby-A encoded wavefiles
and output a restored non-Dolby 24-bit wavefile would be most
useful. I have several recordi
At 11:34 29-04-13, Dave Malham wrote:
>It is possible but I wasn't at all sure that it wasn't the ceramic
>resonator used in the oscillator.
What mechanism causes deterioration in one of these?
David
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ht
On 2013-04-29, Dave Malham wrote:
Pretty certain it could be done with an ARM with C or C++ these days.
Yes, though the data rate of the incoming video stream is a bit steep
(20-30MB/s), so that you need a rather muscular DSP to keep up, and you
probably won't want to go the easiest way whic
Hi,
It would have been difficult "in t'owld days" using dsp's with their
(then) very small memories and the requirement to use assembler because of
the general lack of high performance high level language compilers. Pretty
certain it could be done with an ARM with C or C++ these days. However, it
On 29 Apr 2013, at 18:42, umashankar manthravadi wrote:
> many years ago, I tried to convince people it is worth producing a software
> PCM F-1 decoder, using a low cost video card and a a VHS player (all our PCM
> F1 recordings are on VHS). I thought it would be simple, but nobody showed
> any
FWIW, I've got a few working systems, F1, 601, 701 and two Betamax VCRs (PAL
only).
The 601 and 701 have a SPDIF output.
They are still used in our studio for clients who require transfers.
Kees de Visser
Galaxy Classics
On 29 Apr 2013, at 17:59, Dave Malham wrote:
> A few months ago I had to s
On 29/04/2013 16:59, Dave Malham wrote:
A few months ago I had to sort out a PCM701 with one of my spdif cards in
(the ones I used to do for Audio Design). We went through three PCM units
before we found one that worked fully in replay mode (the original, one
from the Uni and the final one, off E
100
> From: dave.mal...@york.ac.uk
> To: sursound@music.vt.edu
> Subject: Re: [Sursound] Sony PCM? (was Re: DTS Headphone:X)
>
> It is possible but I wasn't at all sure that it wasn't the ceramic
> resonator used in the oscillator. Sooner or later we may have to resort
It is possible but I wasn't at all sure that it wasn't the ceramic
resonator used in the oscillator. Sooner or later we may have to resort to
writing software to do the job - assuming we can find working Betamax
machines. Fortunately the encoding is very well documented in the various
manuals, unli
At 10:59 29-04-13, Dave Malham wrote:
>A few months ago I had to sort out a PCM701 with one of my spdif cards in
>(the ones I used to do for Audio Design). We went through three PCM units
>before we found one that worked fully in replay mode (the original, one
>from the Uni and the final one, off
tal outputs, but cricklewood electronics (?) produced a card which
>> produced a sdif signal out of the F1 that we are using to convert our pcm
>> recordings to wav files without redigitising. umashankar
>> > Date: Mon, 29 Apr 2013 15:02:32 +0100
>> > From: richarddob
s (?) produced a card which
> produced a sdif signal out of the F1 that we are using to convert our pcm
> recordings to wav files without redigitising. umashankar
> > Date: Mon, 29 Apr 2013 15:02:32 +0100
> > From: richarddob...@blueyonder.co.uk
> > To: sursound@music.vt.
produced a sdif
signal out of the F1 that we are using to convert our pcm recordings to wav
files without redigitising. umashankar
> Date: Mon, 29 Apr 2013 15:02:32 +0100
> From: richarddob...@blueyonder.co.uk
> To: sursound@music.vt.edu
> Subject: [Sursound] Sony PCM? (was Re: DTS
On 29/04/2013 11:53, Jon Honeyball wrote:
I have a pcm-f1 tape of the Zuccherelli stuff from 30 years ago, for those
with long memories. Must pull that into a wav file, but my f1 has no
digital output. Hmmm
As it happens, I have a Sony PCM-701ES (incl SPDIF) with the CDP digital
port adde
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