what's the meaning of electrical signal applied in computer system?
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need more information
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Ribbon cables are the data lines, there are nine wires in the ribbon cable, 8 carry data--one bit each, either on or off signals to make up the 8 bits for each byte.  Each time a byte of information is transmitted, 8 signals, one for each wire, are sent downt the 8 wires at once.  That's why this is called a parallel system, all eight signals have to go down the wire at the same time running parallel to each other to the receiving end.\n\nThe ninth wire in the ribbon cable is the bit parity signal, either the other 8 signals add up to odd or even according to your system's set up, if the parity bit is even when it should be odd or vice versa, there has been a fault in the data sent down the ribbon cable.  This is the checking system, to make sure there is data integrity in the data being passed between the device and the mother board.\n\nIn essence the ribbon cable is the wire that connects the device (like a hard drive) to the mother board for the purposes of sending data back and forth. While there is current (in micro voltage) running down these lines, they are not the lines that power the device to which they connect or the motherboard, there are power connectors too, these are usually red, yellow and black or blue wires that also connect to the various devices hooked up..they power those devices operation, so you get a power train connected to each device (usually three wires) and a data train (the ribbon cables).
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The physical means of communication between a person and a software program or operating system. At its most basic, this is the exchange of typed statements in English or a program-like set of commands.
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A digital signal is composed only of electrical pulses representing either zero or one. Because digital signals are made up only of binary streams, less information is needed to transmit a message. Digital encoding therefore increases the capacity of a given radio frequency. Furthermore, only digitized information can be transported through a noisy channel without degradation\n\nSignals that are recorded in analogue format are modulated, ie their information is contained in amplitude or amount of signal. Digital, conversely, is either on or off, and amplitude is identified in a different way
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There is a piece of hardware in the back of the computer called a Power Supply. It converts the electricity from the wall into something the computer can handle. The Power Supply also has a off switch. If you hit that all electricity ceases to your computer, thus making it impossible for the computer to turn on. When that light is on it means the computer is receiving electricity.
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It is a "slot" on your computer's mother board. It is where "component control cards" such as video, modem, etc. are placed.\n\nThe letters “PCI” stand for Peripheral Component Interconnect, and is responsible for managing the communication “traffic” from different devices to the processor. \n\nLEARN MORE HERE:\nhttp://www.geeks.com/techtips/2005/techtips-022405.htm\n\n**notice all the copycats below**
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Electric current is the flow of electric charge. This can be electrons or charged ions, like in electrolyte solutions. \n\nElectrons are the charge carriers in metals. They follow an an erratic path, randomly bouncing from atom to atom, but generally drifting in the direction of the electric field.\n\nThe net drift speed of the electrons is therefore slow, of the order of mm/sec in copper wires.\n\nHowever, electric current signals are waves which propagate at very high speed, close to the speed of light in the medium.
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By definition, something that has a defined frequency has a period. For the purposes of electricity, alternating current occurs as a sine wave pattern.\n\nThis means that the value of a 60 Hz signal added to a 100 Hz signal gives a waveform that is the compound of the two. Basically, it would appear to be a 160 Hz signal superimposed on a 40 Hz carrier.\n\nThe correct way to determine a value for the signal at any given point in time is to add the values of the two curves based on their frequency ... X sin (pi/3) + Y sin (pi/1.8), where X and Y are the amplitudes of the original two waveforms (X fo 60 Hz, Y for 100 Hz).
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Okay.  I'm Electrical and Computer Engineer, so I will admit to some bias.  However, it seems to me that you cannot be a competent Biomedical Engineer without some EE/CE knowledge.  \n\nMux -- a very common and basic electrionic component that selects from two or more inputs.  It seems to me that you would have many applications in patient monitoring, drug delivery, imaging, and prosthetic applications.  \n\nShift register -- a common implementation in digital signal processing applications.  For example, if you have a patient monitor that is supposed to alarm under certain conditions, the likely implementation of the signal processor would be using shift registers.\n\nMicroprocessors -- these are used as controllers in lab equipment, patient monitors, imaging systems, and, increasingly, in smart devices implanted in patients.\n\nFor biomedical engineering, you will need to understand signal processing, sampling, and control systems.  It seems that the subjects you are studying are directly related to these topics.\n\nHope this helps!
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I hope this is what you mean...\n\nanalog signals are waves of energy, like a voice/vibration. Digtal sends transmissions in 1s or 0s so it's more accurate for the most part. Waves can lose their integrity.
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it is just the signal from pc to monitor.
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communications\nThe electronic transfer of information from one location to another. "Data communications" or "datacom" refers to digital transmission, and "telecommunications" or "telecom" refers to a mix of voice and data, both analog and digital. "Networking" refers specifically to LANs and WANs.\n\nThe term "communications" used by itself generally pertains to telecom-related subjects such as PBXs, modems, call centers and the like. However, the word is also a generic English word that is used descriptively such as in the headline "Analog Vs. Digital Communications" below. Thus, "communications" is used specifically in some cases and more generically in others.
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Its a vague question, but it has an easy answer. There are several things required to "control" a computer, none more important than the other. The first is of course the CPU, which handles all the instructions the computer executes and generates many control signals for the rest of the computer. The CPU also performs aritimetic and logic functions. Next is the clock generator/controller, a circuit that generates timing and some control signals for the CPU and rest of the computer. Then there is memory, which comes in two general forms, ROM and RAM. ROM stands for Read Only Memory and RAM stands for Random Access Memory. RAM is the portion of memory where computers store temporary information. These three general circuits make up the control system for computers. But for a computer to be of any use it needs Input/Output circuits like USB, parallel, serial, video, etc.
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Computer, machine that performs tasks, such as calculations or electronic communication, under the control of a set of instructions called a program. Programs usually reside within the computer and are retrieved and processed by the computer’s electronics. The program results are stored or routed to output devices, such as video display monitors or printers. Computers perform a wide variety of activities reliably, accurately, and quickly.\n\nPeople use computers in many ways. In business, computers track inventories with bar codes and scanners, check the credit status of customers, and transfer funds electronically. In homes, tiny computers embedded in the electronic circuitry of most appliances control the indoor temperature, operate home security systems, tell the time, and turn videocassette recorders (VCRs) on and off. Computers in automobiles regulate the flow of fuel, thereby increasing gas mileage, and are used in anti-theft systems. Computers also entertain, creating digitized sound on stereo systems or computer-animated features from a digitally encoded laser disc. Computer programs, or applications, exist to aid every level of education, from programs that teach simple addition or sentence construction to programs that teach advanced calculus. Educators use computers to track grades and communicate with students; with computer-controlled projection units, they can add graphics, sound, and animation to their communications (see Computer-Aided Instruction). Computers are used extensively in scientific research to solve mathematical problems, investigate complicated data, or model systems that are too costly or impractical to build, such as testing the air flow around the next generation of aircraft. The military employs computers in sophisticated communications to encode and unscramble messages, and to keep track of personnel and supplies.\n\nThe physical computer and its components are known as hardware. Computer hardware includes the memory that stores data and program instructions; the central processing unit (CPU) that carries out program instructions; the input devices, such as a keyboard or mouse, that allow the user to communicate with the computer; the output devices, such as printers and video display monitors, that enable the computer to present information to the user; and buses (hardware lines or wires) that connect these and other computer components. The programs that run the computer are called software. Software generally is designed to perform a particular type of task—for example, to control the arm of a robot to weld a car’s body, to write a letter, to display and modify a photograph, or to direct the general operation of the computer.\n\nWhen a computer is turned on it searches for instructions in its memory. These instructions tell the computer how to start up. Usually, one of the first sets of these instructions is a special program called the operating system, which is the software that makes the computer work. It prompts the user (or other machines) for input and commands, reports the results of these commands and other operations, stores and manages data, and controls the sequence of the software and hardware actions. When the user requests that a program run, the operating system loads the program in the computer’s memory and runs the program. Popular operating systems, such as Microsoft Windows and the Macintosh system (Mac OS), have graphical user interfaces (GUIs)—that use tiny pictures, or icons, to represent various files and commands. To access these files or commands, the user clicks the mouse on the icon or presses a combination of keys on the keyboard. Some operating systems allow the user to carry out these tasks via voice, touch, or other input methods.\n\nTo process information electronically, data are stored in a computer in the form of binary digits, or bits, each having two possible representations (0 or 1). If a second bit is added to a single bit of information, the
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"Computer software (or simply software) refers to any of the various programs by which a computer controls aspects of its operations, such as those for translating data from one form to another, as contrasted with hardware, which is the physical equipment comprising the installation. The term is roughly synonymous with computer program but is more generic in scope. In most computers, the moment-to-moment control of the machine resides in a special software program called an operating system, or supervisor. "
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There are 2 different methods, either by Interrupt or by Polling.\nBy Interrupt means, every event will be sent to the CPU (the interrupt), whereby the interrupt handler checks where from the event is coming, and depending on the priority the event will be treated immediately (in case the event has the higher priority than the current process) or will be postponed (in case the event has the equal or a lower priority than the current process).\nBy Polling means, every input/output card will be scanned periodically (every 1ms, 10ms or what else) and in case there is a status change compared to the previous status, the changes will be treated immediately.\n(sorry, this is a very rough description)
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it means its connected to your computer!lol x x x