modulate Modulates signal according to the modulation method y=modulate(x,fc,fs,method,opt) [y,t]=modulate(x,fc,fs,method,opt) [y,t]=modulate(x,fc,fs,method,opt) Returns the modulated vector y and the time vector 't' Modulation is performed according to the following table METHOD MODULATION SCHEME 'am', Amplitude modulation, double side-band, suppressed carrier 'amdsb-sc' opt not used. This is the default method. 'amdsb-tc' Amplitude modulation, double side-band, transmitted carrier opt is a scalar subtracted from x before multiplying x with the carrier wave. It defaults to min(min(x)) so that the input signal after offset is always non-negative 'amssb' Amplitude modulation, single side-band OPT not used. 'fm' Frequency modulation opt is the constant of frequency modulation. opt = (fc/fs)*2*pi/max(max(abs(x))) by default 'pm' Phase modulation OPT is the constant of phase modulation. opt = pi/max(max(abs(x))) by default Phase lies between -pi and +pi 'pwm' Pulse width modulation opt='left' corresponds to left justified pulses. opt='centered' correspondes to centered pulses. The default value of opt is 'left'. 'ppm' Pulse position modulation opt is a scalar between 0 and 1 which specifies the pulse width in fractions of the carrier period with default value 0.1. 'qam' Quadrature amplitude modulation opt is a matrix of the same size as X which is modulated in quadrature with x. If x is a matrix, its columns are modulated. Example y = 1. 1. 0. 0. Author Ankur Mallick