Re: FLASH: sound

[Carterspot]

Interesting question: you are correct re sample rate -- it is how many 

digital 'pictures' are recorded per second (i.e., 44.1 kHz = 44,100 

samples/second). Bit rate gets a little more confusing in reference to the 

Internet.


Bit depth (as traditionally referred to in the field of digital audio) refers 

to the 'quality' or size of each sample (see above). A 16 bit file indicates 

that regardless of sample rate, each individual sample is taken to the 16th 

bit (not really, but theoretically. Generally one bit is used for error 

correction).


You'll find that bit depth is perhaps the most crucial element of audio 

quality. The math is not hard to convert a sample rate (kHz) from 44.1 to 

22.05. You just toss out half the samples. Eliminating half the bits of each 

sample, however, produces horrendous results. You probably notice this when 

you use Flash to compress audio, bringing the bits down to 5, or even 4, from 

typical 16 bit (CD Quality) audio. Try it in Soundforge too -- what a 

difference a few bits make!


But what about bit rate? This really applies to streaming media, whether it 

be DVD MPEG, RealAudio, etc. It's a question of how many bits you can fit 

through the 'pipe' per second, which is why it is oft referred to in the time 

domain - kbps. How the decoder puts them together at the end of transmission, 

as well as the rate and number of bits sent, has a lot to do with the quality 

of reception.


HTH,

Stace

loopfrog.com


In a message dated 5/22/00 1:24:13 PM Eastern Daylight Time,

vptransforma [dot] cl

writes:


> Hello:

>  

>  If someone knows something about sound, plese, help me to clarify this

>  doubt

>  

>  What is the difference between sample rate and bit rate?

>  I know that sample rate is the frequency of sampling of the sound that

>  determines its quality (resolution) and defines in khz... bit rate

>  apparently defines in bits or kbps but i don't know what it determines.

>  


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