Application of analog signals

Analog signals are continuously changing physical quantities and are widely used in many fields. The following is a detailed introduction for you:


Communication field

Traditional telephone system

The human voice in the traditional telephone system is transmitted in analog form. The analog modem converts digital data into analog signals and transmits them through telephone lines.


Wireless communication

In wireless communication, analog signal processing plays a key role. For example, modulation and demodulation technology loads information onto the carrier signal through modulation, and demodulation extracts information from the received signal; signal filtering and noise suppression, carrier recovery and synchronization, multiplexing and demodulation also involve analog signal processing.


Audio processing field

Music player and radio

The sound signals received by music players, radios and other devices are analog signals. These analog signals are directly output to the speakers after amplification, filtering and other processing.


Audio output device

In many embedded systems, digital-to-analog converters (DACs) convert digital signals into analog signals for audio output. DAC modules of microcontrollers such as STM32 can realize functions such as audio signal output.


Measurement and control field

Sensors and controllers

The physical quantities measured by sensors (such as temperature and pressure) are analog signals, which can be processed and feedback-controlled by analog controllers.


Image processing field

Cameras and displays

The images captured by cameras are continuously changing analog images, which can be directly displayed on video displays; digital displays convert digital images into analog form for display.


Other fields

The technology and methods of analog signal processing existed long before the birth of electronics. The early use of mechanical devices for signal processing also belonged to the category of analog signal processing. Moreover, analog signal processing still plays an important role in specific fields. Although digital technology has developed rapidly and digital signal processing has gradually become dominant, analog signal processing still has its irreplaceable features.

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