i want to generate 1khz freq with hanning , the code is provided , tell me the input values.

clear all;

signal_freq1=input('center-frequency of the signall in Hz/n');

num_cycles1=input('\n number of cycles1\n');

del_t1=input('\n Time increment1\n');

total_time1=input('\n total signal duration in secl\n');

offset_time1=input('\n Offset time_ actual starting time for signal1 \n');

signal_freq2=input('center-frequency of the signal2 in Hz\n');

num_cycles2=input('\n number of cycles2\n');

del_t2=input('\n Time increament2\n');

total_time2=input('\n total signal duration in sec2\n');

offset_time2=input('\n offset time- actual starting time for signal2 \n');

%-------------------------------------------------------------------------------%

signal_offset=round(offset_time1/del_t1);

hanning_duration1= (1/signal_freq1)*num_cycles1;

hanning_width1= round(hanning_duration1/del_t1);

signal_lengthl=round(total_time1/del_t1);

if signal_length1 < signal_offset1+hanning_width1

signal_length= signal_offset+hanning_width1;

end

%-----------------------------------------------------------------------------%

hanning_window1=hann(round(hanning_duration1/del_t1));

continuous_cosinel1=cos(2*pi*signal_freq1*(0:length(hanning_window1)-1)*del_t1);

time1=0:del_t1:del_t1*signal_length1;

output_signal1=zeros(1,length(time1));

output_signal1(signal_offset1+1:signal_offset1+round(hanning_duration1/del_t1))=hanning_window1.*continuous_cosinel';

%output_signal=hanning_window.*continuous_cosine';

%----------------------------------------------------------------------------%

figure(1),plot(time,output_signal1);

%--------------------------------------------------------------------------%

Answer 1

[Dev]

Hi @Parjanya,

There are two signals in the code provided in the question. I am assuming here that only the first signal is used and the second one is unused. Accordingly, I have mentioned some reference input values for the first signal, and these values can be referred for the second signal too (if used).

• Center-frequency of signal1 in Hz-

signal_freq1 = 1000 % since we want to generate 1 khz frequency

• num_cycles1 = 5 % since 5 is a common cycle number
• Time increment1 (del_t1)-

For audio, a common sampling rate is 44100 Hz, so-

del_t1 = 1/44100

• Total signal duration (total_time1)-

This must be at least as long as your window, ie, Window duration = num_cycles1 / signal_freq1

For 5 cycles at 1000 Hz:

total_time1 = 5 / 1000 = 0.005 sec
total_time1 = 0.01 (10 ms - approx)

• Offset time-

If you want the signal to start at the beginning:

offset_time1 = 0

We can set the second signal parameters to 0 (if unused). On using the above input values, we can generate the following 1 khz frequency, as seen in the screenshot below.

I hope the above response answers the question.