dithering

bhodgson wrote on 10/4/2000, 4:06 PM
hello everyone

i have a quick question , and it may be a dumb one, but any
help would be greatly appreciated. I am recording everyting
in 24 bit, 44.1 or 48 sample rate. i would love to be able
to edit a small section of one track in my sound editor,
which i use sound forge, but I can't, i know because it
doesnt support 24 bit. i tried it in wavelab as well, didnt
work, and i tried to open the wav in cool edit, and got a
full wave of "white noise" almost like raw data or
something. I tried to put a dither on the track fx, to see
if i could somehow use before i took it to sound forge, but
it didnt work. is ther a way i can dither a track before
taking it to sound forge or another wav editor? or is there
another trick to use? I think ive heard Vehgas audio can
edit direct x on each track, but as of now im using vegas
pro. Also, another possible dumb question, but if i record
at 48 or 96 sample rate, when i dither my bits down, will
that dither the sample rate down as well? or does that
cause a problem? is there an external dithering program i
should use first? any help would be much obliged. thanks!

brad hodgson

Comments

Rednroll wrote on 10/4/2000, 10:26 PM
You can Solo the Event or Track that you need to dither, then goto the
"Tools" menu and do a "Mix To New Track" Then Select Your format
under the Template drop down list that you want. This way Vegas will
do the dithering and you don't need an outside plugin.

The answer to Sampling Rate and Bit depth is "No there is no direct
correlation between the two. I use to teach this in a course I taught
in the past, it will be hard to explain this without a drawing for
you to see, but I will give it a shot to explain it to you.

Take a waveform and lets draw it on an X/Y Graph...imagine your
waveform being on a piece of graph paper. When we take a sample of
something what we do is actually assign it a numerical value the
waveform is closest to on the Y axis at a particular Time (the
X-axis). In this example the X axis represents Time (which will
correspond with your sampling Frequency). The Y-axis corresponds with
Amplitude/Volume(which will correspond with the number of bits.) The
more bits there are on the Y axis the more accurate we can be to
assigning the waveform a number which is close to the waveform at that
particular spot that a "Sample" is taken of the Waveform. Thus the
more bits there are,the more numbers there are to assign to the
waveform making it have better resolution on the Y-axis. 2^24 to be
the exact numbers there are on this Y axis if it's 24 bit and 2^16
numbers if it's 16 bit. The Sampling Frequency Is how many times we
take a "Sample" or snapshot of that waveform in 1 Second. So the
higher the Sampling Frequency, the more numbers we assign to the
X-axis/Second (ie higher resolution, more divisions the X axis gets
divided into in 1 second.) Well I know this might be hard to picture
or understand from my explaination, but if I was able to draw on this
forum, it would be pretty simple for you to understand, If anyone at
SF wants to give a better explaination at it, please do so.
Basically in a nut shell, they have no direct relation to each
other, the X axis is independent of the Y-axis.

Hope this helps,
Brian Franz


brad hodgson wrote:
>>hello everyone
>>
>>i have a quick question , and it may be a dumb one, but any
>>help would be greatly appreciated. I am recording everyting
>>in 24 bit, 44.1 or 48 sample rate. i would love to be able
>>to edit a small section of one track in my sound editor,
>>which i use sound forge, but I can't, i know because it
>>doesnt support 24 bit. i tried it in wavelab as well, didnt
>>work, and i tried to open the wav in cool edit, and got a
>>full wave of "white noise" almost like raw data or
>>something. I tried to put a dither on the track fx, to see
>>if i could somehow use before i took it to sound forge, but
>>it didnt work. is ther a way i can dither a track before
>>taking it to sound forge or another wav editor? or is there
>>another trick to use? I think ive heard Vehgas audio can
>>edit direct x on each track, but as of now im using vegas
>>pro. Also, another possible dumb question, but if i record
>>at 48 or 96 sample rate, when i dither my bits down, will
>>that dither the sample rate down as well? or does that
>>cause a problem? is there an external dithering program i
>>should use first? any help would be much obliged. thanks!
>>
>>brad hodgson
bhodgson wrote on 10/4/2000, 11:25 PM
Brian,

It helps very much. You explained it all for me. Thanks for taking
the time to reply w/ your explanation. Have a great day!

Brad

Brian Franz wrote:
>>You can Solo the Event or Track that you need to dither, then goto
the
>> "Tools" menu and do a "Mix To New Track" Then Select Your format
>>under the Template drop down list that you want. This way Vegas
will
>>do the dithering and you don't need an outside plugin.
>>
>>The answer to Sampling Rate and Bit depth is "No there is no
direct
>>correlation between the two. I use to teach this in a course I
taught
>> in the past, it will be hard to explain this without a drawing
for
>>you to see, but I will give it a shot to explain it to you.
>>
>>Take a waveform and lets draw it on an X/Y Graph...imagine your
>>waveform being on a piece of graph paper. When we take a sample
of
>>something what we do is actually assign it a numerical value the
>>waveform is closest to on the Y axis at a particular Time (the
>>X-axis). In this example the X axis represents Time (which will
>>correspond with your sampling Frequency). The Y-axis corresponds
with
>> Amplitude/Volume(which will correspond with the number of bits.)
The
>> more bits there are on the Y axis the more accurate we can be to
>>assigning the waveform a number which is close to the waveform at
that
>> particular spot that a "Sample" is taken of the Waveform. Thus
the
>>more bits there are,the more numbers there are to assign to the
>>waveform making it have better resolution on the Y-axis. 2^24 to
be
>>the exact numbers there are on this Y axis if it's 24 bit and 2^16
>>numbers if it's 16 bit. The Sampling Frequency Is how many times
we
>>take a "Sample" or snapshot of that waveform in 1 Second. So the
>>higher the Sampling Frequency, the more numbers we assign to the
>>X-axis/Second (ie higher resolution, more divisions the X axis
gets
>>divided into in 1 second.) Well I know this might be hard to
picture
>> or understand from my explaination, but if I was able to draw on
this
>> forum, it would be pretty simple for you to understand, If anyone
at
>> SF wants to give a better explaination at it, please do so.
>>Basically in a nut shell, they have no direct relation to each
>>other, the X axis is independent of the Y-axis.
>>
>>Hope this helps,
>>Brian Franz
>>
>>
>>brad hodgson wrote:
>>>>hello everyone
>>>>
>>>>i have a quick question , and it may be a dumb one, but any
>>>>help would be greatly appreciated. I am recording everyting
>>>>in 24 bit, 44.1 or 48 sample rate. i would love to be able
>>>>to edit a small section of one track in my sound editor,
>>>>which i use sound forge, but I can't, i know because it
>>>>doesnt support 24 bit. i tried it in wavelab as well, didnt
>>>>work, and i tried to open the wav in cool edit, and got a
>>>>full wave of "white noise" almost like raw data or
>>>>something. I tried to put a dither on the track fx, to see
>>>>if i could somehow use before i took it to sound forge, but
>>>>it didnt work. is ther a way i can dither a track before
>>>>taking it to sound forge or another wav editor? or is there
>>>>another trick to use? I think ive heard Vehgas audio can
>>>>edit direct x on each track, but as of now im using vegas
>>>>pro. Also, another possible dumb question, but if i record
>>>>at 48 or 96 sample rate, when i dither my bits down, will
>>>>that dither the sample rate down as well? or does that
>>>>cause a problem? is there an external dithering program i
>>>>should use first? any help would be much obliged. thanks!
>>>>
>>>>brad hodgson