Digital signals?

Why the graph below is considered a digital signal while the time t1 has an infinite number of values and the definition of digital signals are signals that has an finite number of values 

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  • qrk
    Lv 7
    1 month ago

    The vertical blue line is the y-axis (has the same characteristics as the horizontal blue line).

    Horizontal blue line is the x-axis.

    t1 probably refers to the pink line above it which means it has a value of high or is hiding information because the time resolution isn't high enough.

  • 1 month ago

    first of all, you do not define T1. Is it where the vertical blue line is? in that case the signal has a value of zero.

    I'd have to expand the time axis to see what goes on in those vertical pink lines. If they are a pulse with height shown (call it 1 volt), then that is a digital pulse train. The signal levels are –1, 0, +1 volts. 

  • 1 month ago

    There is no scale, but it looks to me like the only values for the signal are -1, 0, and +1.

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