Thursday, March 04, 2010
Sampling:
-To get a good representation of sound in digital format, we need to sample its amplitude at a rate (sample per second, smp/s) equal to at least twice the max frequency (in Hz) of the analog signal.
-After sampling, the signal amplitudes must be put in digital form---this process call quantization. 8 bits per sample are usually used for telephone voice, and 16 bits per sample for each channel for stereophonic compact disc.
Level of amplitude can be distinguished: 2^8 = 256 or 2^16 = 65536
Digital data in bits = 4000 *2 *8bit/sample = 64,000 bps
Compact disc = 44,100 *2*16 =1.41 Mbps
Chheng
Seattle University
Phnom Penh, Cambodia
Washington, U.S.A
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