“Quantization Efficiency”的概念、定义、习题解题方法及翻译-数学辞典

单词

Quantization Efficiency

释义

Quantization Efficiency

Quantization is a nonlinear process which generates additional frequency components (Thompson et al. 1986). This means that the signal is no longer band-limited, so the Sampling Theorem no longer holds. If a signal is sampled atthe Nyquist Frequency, information will be lost. Therefore, sampling faster than the Nyquist Frequency results indetection of more of the signal and a lower signal-to-noise ratio [SNR]. Let be the Oversampling ratio and define

Then the following table gives values of

for a number of parameters.

Quantization Levels
2	0.64	0.74
3	0.81	0.89
4	0.88	0.94

The Very Large Array of 27 radio telescopes in Socorro, New Mexico uses three-level quantization at

, so

References

Thompson, A. R.; Moran, J. M.; and Swenson, G. W. Jr. Fig. 8.3 in Interferometry and Synthesis in Radio Astronomy. New York: Wiley, p. 220, 1986.

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