A digital signal refers to a signal that is discrete and discontinuous in value. It is usually represented by a binary number with a finite bit, and there are only two states: 0 and 1.

Analog signal refers to a signal whose information parameters are continuous within a given range. Or in a continuous time interval, the characteristic quantity representing information can be presented as a signal with any numerical value at any time.

Second, the mode of transmission is different:

Analog signals are generally used to transmit analog data (analog quantities), such as a series of continuously changing electromagnetic waves (such as those in radio and television) or voltage signals (such as audio voltage signals in telephone transmission).

Digital signals are generally used to transmit digital data (digital quantities), such as a series of intermittent voltage pulses (for example, we can use a constant positive voltage to represent binary number 1 and a constant negative voltage to represent binary number 0) or optical pulses.

Third, the differences in advantages.

The characteristics of analog signals: its precise resolution, in the ideal case, has unlimited resolution; When the same effect is achieved, analog signal processing is simpler than digital signal processing.

Digital signal features: strong anti-interference ability and no noise accumulation.

Extended data:

Analog signals and digital signals can be converted into digital signals by PCM pulse code modulation, that is, different amplitudes of analog signals correspond to different binary values. For example, 8-bit coding can quantize analog signals into 2 8 = 256 orders of magnitude, and in practice, 24-bit or 30-bit coding is often used.

Digital signals are usually converted into analog signals by phase shifting a carrier wave. Binary digital signals are used in computers, computer local area networks and metropolitan area networks. 2 1 century, both binary digital signals and analog signals converted from digital signals are actually transmitted in computer wide area networks.

References:

Baidu Encyclopedia-Analog Signal

References:

Baidu Encyclopedia-Digital Signal