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How create enable signal ?

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Henry Buck
Henry Buck 2015-12-26
回答： Walter Roberson 2015-12-26
Hi,
I want to second signal that depend on first signal like an enable signal. There is a counter that running while the first signal appears and after it reaches value(cnt=21), the second signal should create.
Can anyone guide me how to do it ?
Thanks a lot,
Henry
  2 个评论
Jan
Jan 2015-12-26
I do not understand the question. Please edit it to make it more clear.
Image Analyst
Image Analyst 2015-12-26
Henry, are you still there? Please read this and improve your post so people can help you.

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采纳的回答

Walter Roberson
Walter Roberson 2015-12-26
gated_signal(counter) = second_signal(counter) .* (counter >= 21);
The above is for the case where the second signal is to "run" all of the time but the output is to be suppressed until the counter is 21.
If you have the entire second_signal array ahead of time then you can use
gated_signal = second_signal;
gated_signal(1:20) = 0;
If you have the entire second_signal array ahead of time but it is to be delayed by 20 then
gated_signal = zeros(1, length(second_signal) + 20);
gated_signal(21:end) = second_signal;
If you are producing signals one at a time and the second signal is not to start until the counter reaches 21 then
if counter >= 21
gated_signal = second_signal(counter-20);
else
gated_signal = 0;
end

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