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Dolby S: can this mess with the Hi end??

Discussion in 'Recording' started by burn000, Sep 21, 2005.

  1. burn000

    burn000 Guest

    I just received the mastering of a project I recorded few months ago, there is Dolby S on my tape machine, it was OFF for the first song I recorded, then I turned it ON for the other songs cause it was quiet music and wanted to get rid of the noises...

    Now, first thing I notice is that on all the songs recorded with Dolby S, the hi end (cymbals) sounds compressed, unnatural, harsh,
    On the other end, the song I recorded without Dolby S, the cymbals sound natural, open, smooth.

    Is this a normal effect of the dolby? I mean, it is really noticeable, unpleasant, but less overall noise
  2. Costy

    Costy Guest

    Yes, it should be be notisable. Think of dolby (S, B or whatever) as
    a filter (even it's more complicated). Some frequencies got cut. Just
    record all straight onto tape and let mastering engineer take care
    of the noise.
  3. Reggie

    Reggie Distinguished Member

    Dec 20, 2004
    When you encode a song with Dolby S, it is meant to be played back decoded. If you have some kind of Dolby S decoder, you might find that the songs with Dolby S sound about right. I don't think you technically have to, but it might sound better to you if it is decoded when you play it back.

    This paper explains what the boost curve looks like for Dolby S : http://www.dolby.com/assets/pdf/tech_library/212_Dolby_B,_C_and_S_Noise_Reduction_Systems.pdf
  4. Hawkeye

    Hawkeye Active Member

    Sep 26, 2003
    Aurora, ON, Canada
    I'm no uber tech expert, but I don't think you should think of Dolby as a filter at all. It is more like active EQ. Boosting the overall level of higher frequencies relative to the nosie floor (encode) and then reducing the level of those frequencies by an equal amount and thereby reducing the hiss of the noise floor corresponding to the amount of EQ cut in the decode cycle.

    It's more like applied boost and cut to certain frequencies and different levels. A filter just reduces frequencies according to the slope of the filter.

    If anything, a tape encoded with Dolby S and then played back withouth Dolby S being engaged could sound splashy with an exaggerated treble response.
  5. burn000

    burn000 Guest

    I know Dolby boost the Hi at recording and reduce the hi at playback.

    The mixing was done with the dolby decoder, however, the hi end don't sound as good as straight to tape (Dolby OFF) . It just don't sound natural

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