Abstract
Sampling is one of the main processes in an analog-to-digital converter. The sampling theory is examined and the crucial elements are extensively discussed. The relation with other techniques, such as modulation and sampling of noise is described.
The second section discusses the design of time-discrete filters. These filters form an important building block in several conversion structures especially in sigma-delta conversion. Down-sample filters transform the bit-stream format into a more usable pulse-code format. The essential properties of Finite Impulse Response (FIR) and Infinite Impulse Response (IIR) filters are reviewed.
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Notes
- 1.
Strange in the sense that many normal mathematical operations cannot be performed, e.g. δ 2(t) does not exist.
- 2.
To keep in this section time-continuous and sampled sequences and their spectra apart, time domain signals use normal print, while their spectral equivalents use bold face. The suffix s refers to sample sequences.
- 3.
The only storage in the early days of CDs were video recorders. The 44.1Â ks/s sample rate was chosen such that the audio signal exactly fits to a PAL video recorder format (25Â fields of 588 lines with 3 samples per line) of 44.1Â ks/s.
- 4.
A peak-peak value is often used for jitter, but peak-peak values for stochastic processes have no significance if the process and the corresponding number of observations is not identified.
- 5.
The human ear is sensitive for delay variations in sound.
- 6.
The definition for Euler’s relation is: e jπ+1=0. According to Feynman this is the most beautiful mathematical formula as it is relates the most important mathematical constants to each other.
- 7.
An equivalent analog filter would require 10–12 poles.
- 8.
In the period 1970–1980 the charge-coupled device was seen as a promising candidate for storage, image sensing and signal processing. Analog charge packets are in this multi-gate transistor shifted, split and joint along the surface of the semiconductor. Elegant, but not robust enough to survive the digital era.
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3 Sampling
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Pelgrom, M.J.M. (2010). Sampling. In: Analog-to-Digital Conversion. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-8888-8_3
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