TABLE OF CONTENTS The Greek letter pi is ? ? 3.14159
Euler's constant e ? 2.71828
? is a variable used to represent some angle. Often, we use it to represent the phase angle in a time-varying sinusoid. This is typically given in radians, e.g., ? = ?/6.
? is a variable used to represent some angle. It is often used as the argument of a sine or cosine function, e.g., cos( ?).
? is used with statistics, for example, ? 2 is the variance.
? is another variable used to represent some angle. Also, it is used as a frequency, or more precisely, a radian frequency. In this sense, ? = 2 ? f. It has units of radians/seconds.
a stands for amplitude, used with a sinusoid.
f represents a frequency, given in Hertz.
g represents an FIR filter coefficients, appearing with wavelets since h is already used. Typically, g corresponds to the highpass filter of a filter pair.
h represents the unit impulse response. For FIR filters, h will be the same thing as the filter coefficients. With a filter pair, h corresponds to the lowpass filter.
j typically means ? ?1, except when it comes to wavelets, where it is used as an index.
J is the upper limit for j when talking about wavelets.
k is an integer.
m
