At 08:06 PM 2/26/02, Rafay wrote: >How do you describe Sample Rate.? In what context? The term is sometimes used when describing the analog to digital process, for example when digitizing voice. Voice produces an analog wave as your lungs and tongue press against the air. An analog wave has infinite possible values. Computers can't deal with infinity. They work with discreet numbers. The solution is to sample the analog voice many times per second. Sampling means to take a snapshot.
The sample rate is how often the analog wave is sampled. Nyquist showed that you have to sample at twice the rate of the highest frequency that may occur in the original data. Most humans don't output (and can't hear) anything about 4 KHz. So sample 8,000 times per second (8Khz) and the result will be good enough. When using a sample rate of 8,000 KHz, if each sample is saved in an 8-bit byte, the resulting data rate is 64 Kbps. That's one DS0. Compression allows us to use a smaller data rate, with some loss in fidelity. Priscilla ________________________ Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=36577&t=36566 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
