They are the same thing.
A sinusoidal signal.
they have an infinite energy
It does not have to be. Voltage can be DC, sinusoidal, square wave, triangular wave, etc.
You may use a filter which will round off the square pulse to sine wave.The higher order the filter the better the SINE wave . The Square pulse and the sine wave must both be tuned to our required frequency
The main difference between the tow is the signal. VGA uses an analog signal and DVI is a digital signal.
processing is nothing
if the speedometer works off of an input wave (sinusoidal signal) you would think the signal generator would be a source of reference
wave is a part of a signal . millions of wave construct a signal .
The sinusoidal signal is called a basic signal because, by Fourier Analysis, you can not further reduce it. It is one sine wave of one frequency of one amplitude of one phase. It has no harmonics. If you converted it from time domain to frequency domain you would only get one line, at the fundamental frequency.
Distortion.
The amplifier projects the audio signal into something we can comprehend. The oscillator creates a fixed or variable pitch, which is fed to the amplifier. Amplifiers are circuits which transfer an input signal into an output signal. Oscillators are autonomous circuits powered by a constant energy source. They produce a steady state signal e.g. a sinusoidal signal or a chaotic signal.
if a sinusoidal voltage is applied to linear circuit the output voltage is also sinusoidal in nature as far as the waveform is concerned the amplitude of input signal may change and there may be phase displacement between input voltages and output voltages