Signals: In a communication system, data are propagated from one point to another by means of electromagnetic signals. A signal is a series of analogue or digital data. That is a varying voltage (either continuous or discrete) with time in an electronic communication system. Definitions of Data and Signals: Analog Data - Data represented by a continuous physical quantity whose magnitude is proportion a suitable function of the data (information). It can have more than two discrete values in contrast to digital data. . | CSN200 Introduction to Telecommunications, Winter 2000 Lecture_15 Data, Encoding and Transmission Data: What is Data? Any meaningful information is data. Otherwise it is noise or nonterrestrial data. Data in Electronic form: Any meaningful information can be represented into Electrical, Electromagnetic or Optical form for the purpose processing, storing and transmission. Electronic Data can be of two kind: Analogue and Digital Analogue Data - take on continuous values as time changes. ., Voice - uses microphone to convert to electrical form Video - uses video camera Temperature - uses sensor, like thermocouples Pressure - uses piezoelectric crystals Digital Data - take on discrete values, switching ON/OFF, text, integers, etc. Can be grouped into Bits - either a voltage or no voltage, 0 or 1 Bytes - group of 8 bits, like 0100 0001 is A in ASCII code What is Data (2nd time)? Normally we mean digital data processed by a computer. Signals: In a communication system, data are propagated from one point to another by means of electromagnetic signals. A signal is a series of analogue or digital data. That is a varying voltage (either continuous or discrete) with time in an electronic communication system. Definitions of Data and Signals: Analog Data - Data represented by a continuous physical quantity whose magnitude is proportional to a suitable function of the data (information). It can have more than two discrete values in contrast to digital data. Digital Data - Data represented by discrete values or conditions. Analogue Signals - A continuously varying electromagnetic wave that may be propagated over a variety of media. A series of Analog data. Digital Signal - A discrete or discontinuous signal, such as a sequence of voltage pulses. A series of digital data or bits. (Ref: Fig ,, , Slyke) Page 1 (7) CSN200 Introduction to Telecommunications, Winter 2000 Lecture_15 Data, Encoding and Transmission Encoding: The simplest end-to-end data .
