Noise
The effects of random noise can make signal loss and distortion impossible to recover, since amplifying the signal to recover attenuated parts of the signal often generates more noise and amplifies the noise as well.Another method of conveying an analog signal is to use modulation. In this, some base signal (e.g., a sinusoidal carrier wave) has one of its properties altered: amplitude modulation involves altering the amplitude of a sinusoidal voltage waveform by the source information, frequency modulation changes the frequency. Other techniques, such as changing the phase of the base signal do also work.
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Analog circuits do not involve quantization of information into digital format. The source signal information being measured over the circuit, whether sound, light, pressure, temperature, or an exceeded limit, remains continuous from end to end.
Clocks with hands are often called analog displays; those that display digits are usually called digital displays. However, many analog clocks are actually digital since the hands do not move in a smooth continuous motion, but in small steps every second or sub division of a second.
Electronic noise is a characteristic of all electronic circuits. Depending on the circuit, the noise put out by electronic devices can vary greatly. This noise comes from many different electronic effects
Types of Electronic Noise:
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Gaussian noise: Shot noise in electronic devices consists of random fluctuations of the electric current in an electrical conductor, which are caused by the fact that the current is carried by discrete charges (electrons).
Shot noise in resistors: Shot noise in electronic devices consists of random fluctuations of the electric current in an electrical conductor, which are caused by the fact that the current is carried by discrete charges (electrons).
Johnson-Nyquist noise: Johnson-Nyquist noise (sometimes thermal noise, Johnson noise or Nyquist noise) is the noise generated by the equilibrium fluctuations of the electric current inside an electrical conductor, which happens regardless of any applied voltage, due to the random thermal motion of the charge carriers (the electrons).
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White noise: White noise is a random signal (or process) with a flat power spectral density. In other words, the signal's power spectral density has equal power in any band, at any centre frequency, having a given bandwidth.
An infinite-bandwidth white noise signal is purely a theoretical construct. By having power at all frequencies, the total power of such a signal is infinite. In practice, a signal can be "white" with a flat spectrum over a defined frequency band.
Pink, flicker or 1/f noise: Pink noise, also known as 1/f noise, is a signal or process with a frequency spectrum such that the power spectral density is proportional to the reciprocal of the frequency. Sometimes pronounced as one over f noise, it is also called flicker noise. In other words, it is a sound that falls off steadily into the higher frequencies, instead of producing all frequencies equally.
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