📍Purpose of Embedded System
the following tasks:
📌Data Collection/Storage/
Representation
➡Embedded system designed for data collection performs
acquisition of data from the external world.
➡Data collection is usually done for storage, analysis,
manipulation and transmission.
➡Data can be analogue or digital.
➡ Embedded systems with analogue data capturing techniques collect data
directly in the form of analogue signal whereas an embedded system with digital data collection mechanism converts the analogue signal to the digital signal using an analogue to digital converters.
➡If the data is digital it can be directly captured by a digital embedded system.
➡A digital camera is a typical example of an embedded
➡System with data collection/storage/representation of data.
➡Images are captured and the captured image may be stored within the memory of the camera. The captured image can also be presented to the user through a graphic LCD unit.
📌Data communication
➡Embedded data communication systems are deployed in applications from complex satellite communication to simple home networking systems.
➡The transmission of data is achieved either by a wire-line medium or by a wireless medium.
➡Data can either be transmitted by analogue means or by digital means.
➡Wireless modules-Bluetooth, Wi-Fi.
➡Wire-line modules-USB, TCP/IP.
➡Network hubs, routers, switches are examples of dedicated data transmission embedded systems.
📌Data signal processing
➡ Embedded systems with signal processing functionalities are employed in applications demanding signal processing like speech coding, audio-video codec, transmission applications etc.
➡A digital hearing aid is a typical example of an embedded system
employing data processing.
➡Digital hearing aid improves the hearing capacity of the hearing-impaired person
📌Monitoring
➡All embedded products coming under the medical domain are with monitoring functions.
➡Electrocardiogram machine is intended to do the monitoring of the heartbeat of a patient but it cannot impose control over the heartbeat.
➡Other examples with monitoring function are digital CRO, digital multi-meters, and logic analyzers.
📌Control
➡ A system with control functionality contains both sensors and actuators.
➡Sensors are connected to the input port for capturing the changes in the environmental variable and the actuators connected to the output port are
controlled according to the changes in the input variable.
➡Air conditioner system used to control the room temperature to a specified limit is a typical example of CONTROL purpose.
➡Application-specific user interface
➡Buttons, switches, keypad, lights, bells, display units etc are application-specific user interfaces.
➡The mobile phone is an example of an application-specific user interface.
➡ In the mobile phone, the user interface is provided through the keypad, system speaker, vibration alert etc.
