통신실험 결과8

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아주대 통신실험 결과보고서입니다.

목차

ⅠEffect of A-law companding on the performance of a PCM system
1. 실험 계획
2. 실험 과정에 따른 결과

ⅡEffect of μ-law companding on the performance of a PCM system
1. 실험 계획
2. 실험 과정에 따른 결과

Ⅲ토의

본문내용

UNIT TEST
1. Companding is used to obtain a more uniform signal-to-quantiaztion noise ration.
2. The standard values for the -law and the A-law characteristics are =255 and A = 87.6.
3. The eye diagram may be used to determine the performance of a transmission channel.
4. Serial transmission of PCM signal is used when transmitting over long distances.
5. In comparison to a system with no companding, a system with companding exhibits a lower signal-to-quantization noise ration at high signal levels and a higher signal-to-quantization noise ratio at low signal levels. (both a and c)
6. PCM`s resistance to noise and distortion is due to the fact that the decoder need only detect the presence or absence of a pulse.
7. Code words transmitted serially leave the encoder bit by bit, starting with the most significant bit.
8. Companding can be accomplished by using nonlinear quantizers.
9. The low limit of the signal-to-noise ratio at the output of a PCM system is determined by signal-to-quantization noise ratio.

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