I know the problem -- the commercial stations here in AUS do similar things. I configured my MythTV to stop 2 seconds short, so I can check if I get 2 seconds of ads or missed something.

I'm not sure if the dynamic range would be all that useful. Maybe as part of some Bayesian filtering. Color range might be more interesting -- although I guess that depends on the type of show. Actually: the pitch range could help, too. I think you'd probably still anchor it on the time the logo appears, but then use some heuristic for going backwards.

  Peter



On 23/04/10 06:50, Kevin Wright wrote:
It does have one potential use though...

The same thing is done with TV adverts, which offers quite an interesting alternative for detecting and skipping them when using systems like myth. Especially since so many programs have now stopped putting a channel logo between the end of the adverts and the resumption of the program (at least, here in the UK)



On 22 April 2010 21:44, Peter Becker <peter.becker.de <http://peter.becker.de>@gmail.com <http://gmail.com>> wrote:

    The problem is not just technical and affects all digital media,
    including the CD: http://en.wikipedia.org/wiki/Loudness_war

    The Wikipedia article mentions it even existed for vinyl releases
    when producers tried to make their music louder in jukeboxes.

    Considering that trend it does make sense to do your own
    encodings, although I suspect that older CDs might be a good
    starting point.

      Peter




    On 22/04/10 23:49, Kevin Wright wrote:
    The OP wasn't comparing vinyl to CD, he was comparing vinyl to
    whatever compressed format iTunes served up (presumably AAC or MP3)

    These are both use "lossy" compression, a very accurate term for
    a process that most definitely loses sound quality.

    If CD were to be compared to vinyl, then the discrepancy would be
    much less noticeable.  Vinyl still does have the better dynamic
    range and will sound better when played on good equipment, though
    double-blind testing shows that only a small fraction of people
    can reliably distinguish the two.

    Of course, higher-quality digital formats (such as the largely
    ignored DVD-audio) win hands down in any contest vs either CDs or
    Vinyl.


    If you want your music as a file, I'd recommend the FLAC format
    (Free Lossless Audio Codec).  You can use this to compress both
    CD rips and recordings that you make directly.  Some material is
    also possible to source online in FLAC format, this is especially
    popular amongst classical music fans, for whom copyright
    infringement is not an issue.

    However, I'm still not certain of the legal position on using
    bittorrent to download a FLAC version of something that you've
    already payed for in another format.


    After all that, if you then intend to play it back over the cheap
    white headphones that come free with your iPod, I wouldn't bother
    going through all the effort!



    On 22 April 2010 14:30, Casper Bang <[email protected]
    <mailto:[email protected]>> wrote:

        Wow, is that really worth the trouble? I can appreciate the
        desire to
        up the sampling from normal CD (say 24bit/320KHz rather than
        16bit/
        44KHz) or avoid compression (PCM rather than
        Fraunhofer/LAME), but I'd
        imagine you'd need some pretty hard core analog equipment to
        keep the
        noise level down (record warps and low-freq rumble) - or is
        that part
        of the charm? :)


        On Apr 22, 1:42 pm, Christian Catchpole
        <[email protected] <mailto:[email protected]>>
        wrote:
        > Yeah you'll probably need a phono pre-amp.  I put my
        turntable into a
        > mixer and got gain out of it but the EQ wasn't balanced, so
        I assume
        > the phono pre-amp will "know what to do".  Perhaps even
        just an old
        > turntable amp with tape line out.
        >
        > I just used normal wave recording software.  You adjust the
        gain so
        > its within range but not clipping.. But not too low that
        you get extra
        > noise.  Then you can trim and normalize the signal (it
        finds the max
        > point and adjusts the volume so the max fits within the
        bits).  This
        > is not compression it's just a gain adjustment so its not
        quieter than
        > it needs to be.
        >
        > There probably are software filters but I find they do more
        harm than
        > good.. but those are just the ones i tried years ago.  if
        your extra
        > keen you get take the clicks out by hand.
        >
        > I also found that my turntable was slightly the wrong
        speed, so I
        > compared a song length with the same from a CD and worked
        out the
        > ratio to adjust.
        >
        > I also found I could convert old 78s this way on my
        turntable by
        > recording it at 45 then speeding it up.
        >
        > On Apr 22, 4:45 pm, RogerV <[email protected]
        <mailto:[email protected]>> wrote:
        >
        >
        >
        >
        >
        > > On account there are folks on this forum that know a
        thing or two
        > > about the art of recording audio to a digital format, I
        thought would
        > > try posing a question. But first the setup:
        >
        > > My teen-aged son and I were watching recent episode of
        Fringe where
        > > Peter repairs an old turn table for his alternate reality
        father,
        > > Walter. My son commented how he was at a friends house
        and that they
        > > pulled out an old LP player and he listened to vinyl
        analog recordings
        > > for the first time. This prompted me to go to the garage
        and fetch my
        > > British-made Regga turn table and LP album collection.
        They had
        > > probably been entombed for 20 years.
        >
        > > The Regga is an audiophile turn table, tone arm, and
        stylus cartridge
        > > - it was about a $500 combination in early 1980s dollars.
        It's very
        > > simple mechanically. The motor is off in a corner and
        conveys motive
        > > power to the spindle via belt. The platter is 1 inch
        thick solid
        > > glass. Instead of an electronic feed-back loop to
        regulate the
        > > rotational speed, it instead relies on the fly wheel
        effect of a
        > > massive platter. The bottom line is the design and
        construction keeps
        > > the stylus very well insulated from extraneous vibration.
        >
        > > My son was, well, blown away from the sonic experience of
        listening to
        > > vinyl LPs played on this system. It was though he were
        listening to
        > > music for the first time. The detail, spatial location,
        subtle
        > > texture, dynamic range between quite to vibrant strains
        were all more
        > > alive than iTunes music. A good way to tell is listen to
        the 1978
        > > recording of the Pat Matheny Group album vs the iTunes
        version of this
        > > music. You'll be tempted to just delete the iTunes
        version - it's just
        > > flat and stale sounding in comparison to the analog vinyl.
        >
        > > So all this has lead me the matter of what to do with my
        album
        > > collection. I'm thinking that the main problem with
        modern MP3
        > > download music is that the dynamic range has been overly
        compressed.
        > > Surely I could make digital recordings from the phono
        output of my
        > > turntable that would retain the character of musical
        experience?
        >
        > > Do I need to use a phono preamp before feeding a signal
        into the audio
        > > input on my computer?
        >
        > > Should I invest any any particular analog-to-digital
        audio hardware
        > > device?
        >
        > > What software would be good to use? I'll be recording
        entire sides of
        > > an LP at a time and then wanting to go back and split it
        into separate
        > > files per each song.
        >
        > > Is there any software filter that specializes in reducing
        pops and
        > > clicks from analog media?
        >
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