Functions are described briefly below:1) er_add: Add given tranfer functions.2) er_blaschke: Perform desired frequency transformation of digital filter using Blaschke products.3) er_conv: Multiply transfer functions.4) er_fconv: Convolve transfer functions in frequency domain.5) er_firlsinv: Find FIR least squares inverse and error.6) er_fsample: Designs digital filter using frequency sampling approach with optional smoothing.7) er_fwindow: Designs digital filter using rectangular or raised cosine window.8) er_iirlsinv_fir: Find IIR least squares inverse and error.9) er_lpf: Designs prototype Butterworth LPF of given order.10) er_lpfc1: Designs prototype Chebyshev Type I LPF of given order and maximum passband ripple.11) er_lpfc2: Designs prototype Cheyshev Type II LPF of given order and inimum allowable stopband attenuation.12) er_modulate: Modulate given transfer function by desired amount.13) er_pack: Pack transfer function vector coefficients into struct form.14) er_plot: Comprehensive plotting tool to generate plots for, a) Magnitude response, b) phase response, c) impulse response, d) pole/zero plot.15) er_reverse: Time-reverse given tranfer functions.16) er_shift: Time shift given transfer functions right or left.17) er_soap: Design desired digital filter using allpass sections.18) er_spectrans: Perform desired spectral transformation on given transfer functions.19) er_upsample: Perform upsampling operation on given transfer functions.NOTE: All functions require only built-in MATLAB functions.
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