PCM

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Pulse Code Modulation 관련된 실험설명과 그래프

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본문내용

, 1 value different from my result
=> We have small errors here but it could be corrected with more accurate input voltage.
Analyze 3.
Sampling Frequency 10kHz is less than Nyquist rate which is 12kHz. This causes some alias and, thus, the magnitude of pulse train is decreased as frequency increasing.
Analyze 4.
In the case of P2, the value at -140 kHz and -105 kHz are moved to 60kHz and 95kHz respectably because of the sampling frequency of 200kHz in oscilloscope.
In the case of P3, the value at negative frequency(i.e. -200kHz, -16kHz) is carried to positive frequency by 200kHz and those frequency are same as the originals. This can be happened when sampling frequency of oscilloscope is integer times of sampling frequency of PCM.
Analyze 5.
This is because P4 has higher sampling frequency compare to P1. Fs is inversely proportional to Ts.
Analyze 6.
a. 20 kHz
b. Nyquist rate is not satisfied. I would use 40kHz.
Analyze7.
T=5ms, fm= 200Hz.

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