How many samples per second are needed?
Nyquist Theorem: Sampling Frequency >= 最高頻率的2倍
Voice Bandwidth - 300Hz to 3400 Hz
4K x 2 = 8k samples/sec
8K x 8 bit/sample = 64kbps
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nyquist.htm, Tue Jun 13 18:53:39 CST 2023