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4

The output depends on only the current input: $$ s(n)=(n+1)\cdot u(n) $$ For a system to have memory, the output should depend on the previous and/or the future inputs i.e. \$u(n-1)\$ and/or \$u(n+1)\$. The term \$(n+1)\$ does not bring memory to the system. Don't mix this with \$u(n+1)\$.


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What you are referring to is antenna characterization. If you are a big company with lots of money you can go to some specialized laboratory with an anechoic chamber. They will then study the far field pattern of said antenna. If you are some person working in you garage your best chance may be to modelize your antenna in a simulator. Run it to obtain again ...


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You can find the average by calculating the average of one positive half cycle of the sinusoidal waveform. Over one period that repeats the average will be 1/10 of that number, since the full cycle cancels out and the remaining 7 periods are zero. The number (two 2 decimal places) will be about 0.064\$\cdot\$Vm, but you should work it out exactly.


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One method of switching crystals involves using diodes. A diode is put in series with each crystal and a voltage is used to bias the diodes on or off. RF chokes are used to keep the bias voltage from loading down the signal from the crystals. This was done in things like police scanners and CB radios quite a bit, so you might look for schematics of those for ...


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The Arduino libraries have documentation and documentation says how the library works and how it should be used, so this behaviour is expected based on how your code uses the library. The multiplexer most likely works fine, there just is no data transmissions going on at the data pins when your code changes the multiplexer. The data is transmitted out only ...


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If you have a finite-length signal (y in your teacher's example), then by definition the DC component to that signal is it's average value. In Matlab, that average value is mean(y). The concept of DC comes from frequency analysis, where a signal is a linear combination of signals at various frequencies. That "linear" part means that if you know a ...


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The DC offset is the mean. Any non-DC (i.e. AC) components will have zero mean, while contributing to fluctuation around the mean, when the signal is long enough. (if the signal is very short, then a partial cycle of a sinusoidal component at some frequency may have a non-zero average)


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