Re: FLASH: "Clicking" sound problem

[John Croteau]

Hi p-h,


Clicking sound is a common problem when creating and/or playing back

compressed digital audio. In most cases the problem is with the decoder

which is unable to keep up with the digital stream that is sent to it.

This is why sounds will playback on some audio cards properly and not on

others.


The problem occurs when there is a lot of digital detail that is not

analyzed correctly by either the encoder or the decoder. There is no one

solution.


Some suggestions:

You should always export MP3 sound to the Web using the Fast Quality

(Best is bad).

You should try different bitrate setting in the MP3 export settings.

You should test and set each sound's settings separately in the Library.

You should try to import the sound at 22K if you tried 44K first and

vice versa. Etc.

You should always use sound that has not been previously compressed. In

other words don't convert MP3 to wav or aiff and expect good results.

You should make surre your levels do not have peaks in levels that go

more than slightly into the 'red' area.


If you do your own recording:

Don't allow red lining of audio levels anywhere. Short peaks cause

barely noticeable problems in analog recording but when in the digital

realm they can cause major distortion that can not be easily fixed.

Use audio compression to prevent red line levels and distortion so the

dynamic range can be maximized without distortion.

Always use a wind screen on your mike when outdoors or when a person is

up close and personal with the microphone.

Use a high quality mike that has an impedance that matches the

amplifier.

In general the use of a high quality preamp and input at line level into

the sound card will produce the best results.

Better sound cards usually digitize sound better.


Test youe setup and experiment to get the best results from start to

finish. The end result is more important than any of the 'rules'.


-- 

Coming Soon    Flash 4 Web Animation F/X and Design

  http://www.amazon.com/exec/obidos/ASIN/1576105555/flashcentral

-----------                               -----------------------

John Croteau

croteauerols [dot] com (mailto:croteauerols [dot] com)

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