DO .....
always respect yourself.
always maintain your personal integrity.
always help someone else when you can.
always rely on your spiritual strength.
always set higher goals.
always meet deadlines.
always check your work.
always remember your primary goals.

Although i still remember to do all of the above., but I believe that I did so bad on one of my midterm last week.. either coz it's hard or coz I didn't pay enough attention to study the exam, i will still have to accept the result, and this makes me even more stressful after taking the exam.

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