Q&A: In a audio conferencing system,?
GoGvo
Question by hamhamwich: In a audio conferencing system,?
In a audio conferencing system,each persons speech is sampled 4000 times per second and 256 quantisation levels are used per sampleWhen one person speaks for 3 seconds, how much data is sent (to 3 significant figures)?
a)165 B
b)596 B
c)712 B
d) 1.09 KB
e) 3.25 KB
f) 11.7 KB
Any help would be great!
Best answer:
Answer by Paul
It’s 4000 bytes per second so the total is just under 12 kB, i.e. (f).
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96000 bits.
2^8 = 256 => The quantization levels can be represented using 8 bits.
At 4000 hz sampling rate:
8 bits/sample or 1 Byte/sample
1 B/sample x 4000 samples/s
4000 B/s x 3 seconds = 12KB
Nearest answer is 11.7KB. I don’t understand how it is 11.7KB
(Maybe only 7 bits are used for the samples in which case it should be 12 *7/8 = 10.5KB – does not compute either)