Re: FLASH: sound

[Malte K�hrer]

At 07:15 23.05.00 -0400,

Carterspotaol [dot] com

 wrote:

>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.


The 44.1kHz/uncompressed is CD quality. That's about 150KByte/s while mp3's 

are usually "traded" at 128Kbit/s. So that's a compression ration of 1:12 

without really noticable quality losses.



>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).


Bit depth is about how detailed the amplitude is.


A bit depth of 2 for example just allows 4 different amplitudes while a 

depth of 3 allow 8 different ones. I find depths below 4bit seldom acceptable.


>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!


Handwork always gives better results then flash does.



>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.


Here the bitrate equals the sample rate. Just keep in mind that there're 

still modem users out there and try to avoid streaming if the quality counts.


maltek

--

www.phresh.de

the flash resource



>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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