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Author Topic: What is Overflow on DSP  (Read 5154 times)

JaredH

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What is Overflow on DSP
« on: September 04, 2002, 10:32:44 pm »

What is overflow, why does it sound like a bad thing, but when i disable clip protection and get an overflow, it actually sounds better than it does with the clip protection on? Please explain this overflow concept to me. Ive just always left the clip protection on becuase i thought it was helping things, but it actually seems to be a hinderance.
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J. A. Hayslett

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JaredH

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RE:What is Overflow on DSP
« Reply #1 on: September 05, 2002, 10:56:29 am »

Any answers??? Anyone???
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J. A. Hayslett

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Matt

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RE:What is Overflow on DSP
« Reply #2 on: September 05, 2002, 11:27:17 am »

Digital sound is just a bunch of numbers, and those numbers have to be within a certain range.

If you try to make a number bigger than it's supposed to be, it'll loop around and be a negative number.

So, MJ can do two things:

1) "Flat-line" big numbers, so 120% becomes 100%.  However, if you do too much of this, the music will sound unnatural. (try settings MJ to flat line and peg the virtual sub to see what I mean)

2) Scale the output, so if 120% comes along, everything gets turned down 20% so the output won't cross 100%.  This preserves the sound quality unlike flat-lining, but it will also make the output sound quieter.  Remember that "better" and "louder" aren't the same though.

Hope that helps...

-Matt
JRiver, Inc.
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Matt Ashland, JRiver Media Center

JaredH

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RE:What is Overflow on DSP
« Reply #3 on: September 05, 2002, 11:30:22 am »

ok maybe you can help me with this perplexing little conundrum....how come when i have the Clip Protection on, the sound will jump from being quiet to loud and sound like someone is toggling the volume up and down??
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J. A. Hayslett

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Matt

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RE:What is Overflow on DSP
« Reply #4 on: September 05, 2002, 11:44:27 am »

When scaling, MJ will turn down the volume if a big number comes along, and then slowly creep the volume back up. (bit it gets pushed down again by any big numbers)

Normally, you'll hear a volume dip once the music kicks in, but then after that, the changes are so slow that you shouldn't ever notice.

(p.s. I'm assuming you're using MJ 8.0)

Take care.

-Matt
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Matt Ashland, JRiver Media Center
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