1. Digital Systems

2. Digital Design  Digital Design is concerned with the design of digital electronic circuits.  Computers,  data communication equipment,  digital recording, etc.

3. Digital Systems  Digital systems have such a prominent role in today’s everyday life that we refer to the present technological period as the digital age  Signal: The physical manifestation of information.  Digital Systems manipulate discrete elements of information.  The set of symbols is restricted to a finite number of elements, i.e., 10 digits, 26 letters of the alphabet, and 52 playing cards.

4. Digital Systems  Digital signals come from the nature of the information itself or by quantization of a binary process.  Accounting information usually generates digital signals but audio has to be quantized to be recorded in a CD.

5. Digital Systems  Some of the most popular kinds of signals use just two discrete values, 0s and 1s.  Bit: Binary digit with two possible values 1 or 0.  Groups of bits (binary codes) are used to represent more complex elements of information or symbols. Decimal numbers are represented by 4 bits.

6. Digital Systems  Discrete Symbols are represented in digital systems in binary form.  The general purpose computer is the best known digital system.  The name digital computer comes from the fact that they were originally designed to perform numeric computation with the set of digits.

7. Digital Systems  Digital computers and systems became very popular for several reasons:  High Noise immunity  Cost is continuously coming down.  They perform operations otherwise impossible.  A digital system is an interconnection of digital modules. We require Digital Design to understand and to create these modules.

8. Number Systems In general a number with a decimal point is represented as in the following example: