by Dinesh Thakur Category: DIGITAL CONCEPTS

In digital circuit, a signal is represented in discrete states or logic levels. Digital signals are non-continuous and change in individual steps. They consist of pulses with discrete levels. The value of each pulse is constant but there is an abrupt change from one digit to next.

 
by Dinesh Thakur Category: DIGITAL CONCEPTS

Most of the people are familiar with ordinary electrical circuits where voltages and currents can be measured with dial-type meters or analog meters as they are technically called. Such meters follow changes in voltage (or current) in a smooth stepless manner. This is what analog really means in electronics: signals or physical quantities which can vary in smooth-changing, a stepless manner.

 
by Dinesh Thakur Category: DIGITAL CONCEPTS

The DSSS (Direct Sequence Spread Spectrum) is a technique spread spectrum, but unlike the FHSS, no frequency hopping is place: DSSS causes very rapid state transitions (chipping) which tend to spread the spectrum of the signal: in fact, we have seen that with the modulations FSK, PSK and QAM width of the spectrum was twice the rate of the source. Causing "artificially" very high throughput, spectrum is spread.

 
by Dinesh Thakur Category: DIGITAL CONCEPTS

The FHSS (Frequency Hopping Spread Spectrum) was invented and patented in 1942 by the actress Hedy Lamarr and pianist George Antheil, which were quite versatile! The principle of FHSS is quite simple: a wide frequency band is divided into multiple channels and communications are jumping (hopping) sequentially from one channel to another in a sequence and a rate agreed to advance between the transmitter and the receiver.

 
by Dinesh Thakur Category: DIGITAL CONCEPTS

A digital logic circuit that can store a single BIT of information, and is therefore used as the basis for the construction of MEMORY chips, LATCHES and the REGISTERS within processors. A flip-flop can exist in two states, with either a high or low voltage at its output, and flips from one state to the other at each pulse of a CLOCK SIGNAL. Two different implementations of flip-flop are commonly used, called the D flip flop and the j-K flip flop.



 
by Dinesh Thakur Category: DIGITAL CONCEPTS

Boolean logic A formal logic system derived from the BOOLEAN ALGEBRA by interpreting its two permissible values 0and 1 as the TRUTH VALUES True and False. It is used in electronics to define the behavior of all the kinds of LOGIC GATE from which computer processors are constructed, and in programming to define operators that work on truth-valued variables.



 
by Dinesh Thakur Category: DIGITAL CONCEPTS

8088

The 8088 is the chip that launched the PC revolution-IBM designed the original IBMPC around the 8088 microprocessor. The 8088 was also used in the PC/XT. Even by the standards of its day, the 8088 was slow, and it suffered from technical shortcomings that have bedeviled PC software developers ever since.



 
by Dinesh Thakur Category: DIGITAL CONCEPTS

A-to-D conversion (analog-to-digital conversion) is the process of converting analog information from life into digital information that a computer can understand. Most information in nature is in analog form, covering a continuous range of values (such as the passing of time, as exemplified by the hands of a regular clock).



 
by Dinesh Thakur Category: DIGITAL CONCEPTS

Practically speaking, the 80486's main advantage over the 80386 is just that the 486 is faster. Even if you compare the two chips running at the same clock speed, the 486 will generally finish its calculations sooner, sometimes much sooner, than the 386.

 
by Dinesh Thakur Category: DIGITAL CONCEPTS

Amplitude Size, magnitude, extent. When used of a WAVEFORM it refers to the height of the wave, measured from top to bottom of the following trough.

 

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About Dinesh Thakur

Dinesh ThakurDinesh Thakur holds an B.SC (Computer Science), MCSE, MCDBA, CCNA, CCNP, A+, SCJP certifications. Dinesh authors the hugely popular blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps. For any type of query or something that you think is missing, please feel free to Contact us.