Re: FLASH: sound

[Vivian Pavez]

> Date: Sun, 21 May 2000 21:54:29 -0700

>

From: "Marc Hoffman, Poison Dart Frog Media" <maildartfrogmedia [dot] com>

> Subject: Re: FLASH: sound

>

> At 01:23 PM 5/21/2000 , you wrote:

>

> >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.

>

> You are right about sample rate -- it's just the number of times per second

> (1 kHz - 1,000 cycles per second) that the sound is measured. What digital

> sound attempts to do is to record a sound wave as a series of numbers, each

> measuring the wave at a moment in time. The more measurements per second,

> the higher the fidelity, up to about 40kHz, beyond which there's probably

> not a difference discernible to the human ear. A common analogy is to

> imagine trying to draw a smoothly curved wave form on paper by using only

> dots. The closer the dots are to each other, the more the drawing resembles

> a smooth line rather than a series of disconnected dots. Think of sample

> rate as the horizontal spacing of the dots.

>

> Bit rate has to do with the range of values used to record each of those

> measurements. Think of it as the vertical resolution of the dots in your

> drawing -- more values to choose from means the vertical spacing is tighter

> and smoother. Bit rate (known as bit depth in color theory) is the number

> of binary digits used to store a single value. A bit rate of 2 would give

> only four values to choose from for each measurement -- 0, 1, 2, or 3.

> Obviously this would not give you a lot of range to measure the sound.

> 16-bit is the standard for CD quality. 8-bit is usually fine for music,

> especially in multimedia where users aren't usually expecting the same

> quality they hear playing a CD on a high-end stereo system. Depending on

> what type of compression is used, 5-bit can also be okay for music. Lower

> bit rates are usually good only for voice and sound effects that have lots

> of noise in them already.

>

> Hope this helps.

>

> Marc Hoffman

>

> Poison Dart Frog Media

> Flash portfolio: http://www.dartfrogmedia.com/portfolio


Yes, its answer was very complete, thank you very much


--

Vivian Pavez

vptransforma [dot] cl

TRANSFORMA

http://www.transforma.cl




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