As audioguru has indicated there is no practical limit to the length of the period of a squarewave. Is there a particular low frequency in which you are interested?hello frends.....this question is asked to me in interview.....i am unable to find its answer....can u please tell me ????
The practical answer is zero or DC. I don't see why this should be such a challenging question.hello frends.....this question is asked to me in interview.....i am unable to find its answer....can u please tell me ????
The point is that any DC signal including GND fits the literal definition of "periodic" in the sense f(x) = f(x+2∏) for all x from -∞ to +∞. I don't have to wait for the end of the universe, DC is DC and constant by definition.Actually the period cannot exceed the age of the universe. If you have a signal at 0 hz, you may have to wait a while, or a long while or a longer while to see if it really is 0.
Light years measure distance, not time.The opposite of an infinite frequency.
One cycle each zillion light-years.
OK, I'll correct myself.Light years measure distance, not time.
Make it infinity and you've got a deal.OK, I'll correct myself.
The time it will take you to walk the distance a light beam travels in a zillion years.
Yes and for all frequencies. But you do not know it is DC if you do not wait, it may simply be a long period square wave.The point is that any DC signal including GND fits the literal definition of "periodic" in the sense f(x) = f(x+2∏) for all x from -∞ to +∞. I don't have to wait for the end of the universe, DC is DC and constant by definition.
Think about giving that answer in an interview though, especially if they actually were looking for the Nyquist limit.I agree if you are conducting an experiment. The original question asked for a minimum frequency. Zero frequency is one possible answer if you allow a constant value to be included in the set of periodic waveforms. The other possible answer is some infinitesimally small frequency ω that approaches zero from the right, call it 0+, and as has already been observed, you will have to wait a long tome to see it return to its original value.
I would have given the identical answer.The practical answer is zero or DC. I don't see why this should be such a challenging question.
Not quite. In the continuous domain there is no concept of negative frequency. In the digital domain there are two thing going on:in digital singla processing by prokias its written that frequency of digital signal varies from -1/2 to +1/2 hz.is it write ????
by Aaron Carman
by Aaron Carman
by Jake Hertz