comp.soft-sys.matlab - The MathWorks calculation and visualization package.
HEllo All, I am having one querry regarding MATLAB. What I would be doing is that I will give the signal from a microphone and I have to use MATLAB so that the signal gets frequency modulated and then I will be taking the output from the headphone jack and mix it with a carrier frequency [Local Oscillator] and send it to the spectrum analyzer.I am doing a project named (Software Radio) where you have to do the signal modulation using Software So could some one help with the code I have written below it is giving the error. ??? Error using ==> + Matrix dimensions must agree.. Regards Nitin The Code is : AI = analoginput('winsound'); addchannel(AI, 1); Fs = 8000;% Sample Rate is 22050 Hz set (AI, 'SampleRate', Fs) d = 10; % 10 second acquisition set(AI, 'SamplesPerTrigger', d*Fs); start (AI); data = getdata(AI); n = Fs* d; pause(5); %plot (data); %sound(data, Fs); % set carrier characteristics Fc = 1000; % carrier frequency (Hz) c = (1:n) / Fs; % carrier data preparation c = 2 * pi * Fc * c; % set modulator Fm = data; % modulator frequency (Hz) mi = 0.5; % modulator index m = (1:n) / Fs; % modulator data preparation m = mi * cos(2 * pi * Fm * m); % sinusoidal modulation % frequency modulation s = sin(c + m); % frequency modulation %sound presentation sound(s, Fs); % sound presentation %pause(d + 0.5); % wating for sound end
Hello, I'm trying to find the frequency response of a laser (20log(power_ amp_out/current_amp_in) that abide to a certain set of rate equations. As an input I'm using a sinusoidal current above threshold, i.e: I=Idc +Im*sin(2*pi*f*T). For this input current I should also be getting a sinusoidal out put. Using the rate equations I get the power vs. time for each input current The question is what time, T, should I use in the input current? Also, since there are some ringing involved in the output power, should I wait for them to settle down? won't it be a problem is higher frequency? Thanks.
Hi, I have a problem in using frequency hopping modulation,I used the blutooth exemple from file exchange but I extract only the modulation and the demodulation part and I resreve the same parameters then the bluetooth exemple but I get this error message : Error reported by S-function 'scomfskdemod' in 'untitled1/Frequency hopping FM Demodulator/M-FSK Demodulator Baseband': Input signal must be discret The channel that I'm using is AWGN. Have any one an idea about this error.
i have a series data (x1) with length N. i`d like to modulate my data(x1) with pure sinusoid frequency 50Hz. How to do that? Help Me Thanks