The files in this directory present sample calculations to supplement 
the material in chapter 15, "DSP and Software Radios".  The .mcd files 
were generated with Mathcad 7 and the .pdf files are Adobe Acrobat 
versions of those files.

	exp_decay.mcd  exp_decay.pdf
Compares the exponential decay generated by a digital and an analog 
circuit.

	fourier_conv.mcd  fourier_conv.pdf
Demonstrates how to convolve sine waves with a signal to determine 
its frequency content.  This is the same basic method used by the 
Fourier transform.

	quant_rand.mcd  quant_rand.pdf
Quantizing a random signal results in quantization noise.

	quant_sine.mcd  quant_sine.pdf
Quantizing a periodic signal results in quantization spurs.  The 
spurs can be reduced by dithering.

	sampling.mcd  sampling.pdf
Sampling in the time domain results in periodicity in the frequency 
domain (alias frequencies).

	sinc.mcd  sinc.pdf
Linear and dB plots of the sinc function.

	sine_aprox.mcd  sine_aprox.pdf
Generating a sine wave using a fifth-order curve fit.  
 
	windowing.mcd  windowing.pdf
Demonstration of the windowing method of calculating FIR filter 
coefficients.