A: ANALOGUE IT can be AC or DC it is up to the application involved
An analog signal can be a sine wave, a square wave a sawtooth wave or any other varying waveform
Should be a sine ( or cosine) wave.
No and yes. Digital signals are usually square or pulse waves. By Fourier analysis, however, every periodic wave, even a square wave, is the summation of some series (often infinite) of sine waves.
An analog signal is simply a quantity varying continuously over time..But because we are interested in information and communication, we are usually interested in rapidly varying signals that have some underlying periodicity. Therefore we use sin wave
If you feed a sine wave through an amplifier that isn't exactly linear, the output will be distorted, not a pure sine wave. Distortion is the defect where the output from a device does not mirror the input.
By shifting the sine wave by 45 degrees.
The Fourier transform of a sine wave is a pair of delta functions located at the positive and negative frequencies of the sine wave.
Though it is not possible to get a mathematically perfect square wave from a sine wave, it is possible to get a reasonably close square wave from a sine wave. A clipper circuit is one which clips off the top of a sine wave thus giving it a flat top. Clipper circuits find their applications in electronics but not in electrical engineering (that deals with bulk of the power that we use, both at home and in industry). You can also use a comparator, detecting the zero transitions, and producing a digital output which will be close to a square wave. Squareness will be dependent on symmetry, of course.
A sine wave is the graph of y = sin(x). It demonstrates to cyclic nature of the sine function.
An analog signal is one which is continuous in time as well as continuous in amplitude . Example : sine wave, cosine wave. An Digital signal is one which is continuous in discrete in time. Example : square waves.
The voice is not a sine wave.
a phase shifted sine wave of a different amplitude.
Sine waves are a pure frequency, and hence are very stable, when passing through an analog circuit, they will keep their shape but may have their amplitude reduced. In comparison, a square wave has many frequency components, each of which may react differently to a circuit, resulting in a distorted waveform.