Math expr. complex signals

This will do all that, to 32 MHz, in hardware!

(well, it will as soon as I finish the firmware)

John

This does what you asked for (as I understood it) in Matlab, and plays it. It sounds miserable, by the way.

% set up time axis: %(top is in seconds; step set for 44.1 kHz sample rate) top = 10; step = 1 / 44100; t = 0:step:top;

% generate carrier: fc = 400; % carrier frequency %baseSig = cos(2 * pi * fc * t); (NOT USED.)

% generate frequency modulated carrier: fm = 100; % FM modulation frequency md = 10; % maximum deviation b = md / fm; % modulation index fmSig = cos(2 * pi * fc * t + b * 2 * pi * fm * t);

% apply sawtooth amplitude modulation: amf = 10; % am modulating frequency amx = 0.5; % amplitude modulation index stw = sawtooth(amf * 2 * pi * t); % plot(t,stw) to verify amfmSig = (1 + amx .* stw) .* fmSig;

% apply 40 Hz "gated" inversion: sqSig = square(2 * pi * 40 * t); % plot(t,sqSig) to verify

finalSig = amfmSig .* sqSig; %plot(t, finalSig) to verify

wavplay(finalSig, 44100);

Use