C. Quantization & Coding Flashcards
- is the process of converting sampled signal to approximate the sample’s amplitude to a particular level in terms of N-bit binary representation called quantization level.
Quantization
- is a submodule converts independent variable (x-axis values) from continues to discrete.
Sample and Hold
_________________ within the range of the quantizer indicate the allowed levels of quantization.
Horizontal lines
_____________ indicate the sampling times.
Vertical lines
_____________ indicate the sampling times.
Vertical lines
The ___________________ can be obtained by using a S/H circuit.
staircase signal xq(t)
The values allowed in the digital signal are called the ________________, whereas the distance ∆ between two successive quantization levels is called the ________________.
quantization levels, quantization step size or resolution.
- is a sequence eq[n] defined as the difference between the quantized value and the actual sample value.
Quantization error
Quantization error
eq[n] = xq[n] - x[n]
The resulting quantized signal xq[n] can be obtain via eliminating excess digits (truncation) or rounding the resulting number (rounding).
The error of quantizing signal may introduced from distortion of sample signal called _________________, and degradation in the signal held during the conversion called ________ may resulted from practical S/H circuit.
jitter or transient amplitude, droop
The quantization step/resolution, ∆ is defined as
∆ = (xmax - xmin) / L-1 = FSL / ADC range
- involves reading sample values and assigning the proper binary code words called coding.
ADC
- is the representation of the quantized amplitude values of the signal samples in a unique binary number to each quantization level, whereby the digital signal is generated as a series of bits.
Coding
