0
Digital signals are "forced" to be either 1 or 0, whereas analog signals are not. This means that a signal of 0.8 will be pushed to 1 in a digital signal and will remain 0.8 in an analog signal, and 0.2 will be 0 digital and 0.2 analog. This means that in order to overwhelm a digital signal the noise must do much more work to be effective. digital signal have only two states analog have infinite states therefore more susceptible to noise
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
Which of digital signals and analog signals are more vulnerable to error?
Analogue signals are more vulnerable to error than digital signals. See the related question "Why digital signals are more noise free than analogue signals?" for more details.
Why do most networks transmit digital rather than analog signals?
Digital signals are capable of carrying more information than analogue signals because digital signals make use of the bandwidth more efficiently by closely approximating the original analogue..
Why did Congress order the change to digital TV?
Mainly to free up radio frequency spectrum. An analog picture uses 4.5 megahertz for the video and sound and a satellite transponder is typically 8 Mhz. wide. With the new digital system, it's possible to transmit up to eight separate TV channels in the same bandwidth on the transponder using a system called, `multiplexing`.
What are analog and digital signals?
Analog radio signals cause characteristic changes, or modulations, in the radio waves that carry them: amplitude modulation (AM) and frequency modulation (FM). An old technology compared to newer digital signals such as satellite and high definition radio, differences that distinguish analog radio from digital radio include signal characteristics, sound clarity and cost.Type of Signal Transmission1. Carrier waves -- invisible forms of electricity and magnetism that travel wirelessly from radio broadcasting stations to radio receivers -- transmit AM, FM and digital HD radio programs. Digital signals transmit via pulses or digits of binary code, a language based on the numbers 0 and 1, before decoding.Clarity of Sound2. FM analog radio signals encounter interference when large objects such as mountains or buildings enter the intended path of travel, and cannot bend, unlike AM analog signals. An interrupted analog signal results in a crackling, unclear radio station. Digital radio signals generally don't experience interference errors, although bad weather can severely affect satellite stations.Cost3. Most perks have a catch. Satellite radio plays very few commercials, but there's a subscription fee and you must buy a satellite specific receiver. While free, traditional AM/FM radio and HD radio include commercial advertisements. To hear HD radio, you need a specific HD receiver. Digital HD receivers can play both analog and HD radio stations, but traditional analog receivers can stream only AM/FM stations.
What are the needs for conversion between analog and digital data?
We like to convert audio signals to a digital signal. First, as a digital signal, it can be moved around many times without degrading during transmission. Old vinyl records would eventually wear out and get scratched. Tapes would wear out and the signal would be degraded. Not so with an audio track that is digitized. The data string is easier to "protect" than the vulnerable records or tapes. It's not going to degrade or "wear out" from playing. Also, digital audio can be stored as a digital file in contemporary computer- or microprocessor-based storage systems. This kind of storage can suggest that it can be kept around indefinitely. Certainly since it's a digital data string, it can be stored a "long time" without fear of degradation of the media, like with records or tape. Another advantage of converting audio to a digital signal (and a biggie) is that as a digital signal, it can be processed to achieve almost limitless effects. The clever designs of digital signal processing software make these applications powerful manipulators of any audio that is pushed through them in the form of a data string. The end product is constrained by almost nothing but the creativity (and the skill at using the software) of the person sitting at the keyboard of the computer. Got links if you want them. They are to related articles posted by our friends at Wikipedia, where knowledge is free.
Why is digital technology preferred to analog technology in communications technology?
Why digital communications and what its advantages over analog communication ,first you have to know what is the difference between analog signal and digital signal. Analog signal analog signal is continuous time signal i.e. it has a value at any moment of time and it has infinite number of valus , such as dinusoidal signal ,you can substitute X with any value and you will have an value in Y in the follwing sin relation Y=sin(X). 1-Noise and destortion immunity:-when analog signal is transmitted in free space for long distances it will be distorted and no an ideal recovery done in receiver to recover the exact signal which transmitted ,but in digital communication digital signal consist of 2 levels only zero or one (not like the analog one , it has infinite numbers of values or levels at each period of time),so digital signal can be recovered easily and excactly like transmitted one. Hint : Device that used to pattially recover the analog signal after a certain distance is called repeater ,from its name it receives transmitted analog signal and filter it and amplify it and transmitt it),but in digital transmission it is different ,the device used for recovering digital signal which transmitted from acertain distance is called regenerative repeaters ,it receives transmitted digital signal and recover it to regenrate a new exact signal like received one then retransmitt it for further distance. 2-More privacy and security due to encryption. 3-Error detection techniques can be used and correction as well. 4-Easy for processing and applying multiplexing techniques. 5-Low cost. 6-Transmission rate can be changed easily. 7-Digital hardware implementation is flexible and permits the use of micrprocessors, digital switching elements and layer scale. Thanks for reading H.M.S
What are voip systems?
VoIP stands for Voice over Internet Protocol. It takes analog phone signals and transfers them to digital so you are able to make free phone calls over the internet. This especially comes in handy for over seas calls.
What is the difference between digital and analog signals?
Digital/Analog An analog or analog signal is any time continuous signal where some time varying feature of the signal is a representation of some other time varying quantity. It differs from a digital signal in that small fluctuations in the signal are meaningful. Analog is usually thought of in an electrical context, however mechanical, pneumatic, hydraulic, and other systems may also convey analog signals. An analog signal uses some property of the medium to convey the signal's information. For example, an aneroid barometer uses rotary position as the signal to convey pressure information. Electrically, the property most commonly used is voltage followed closely by frequency, current, and charge. Any information may be conveyed by an analog signal, often such a signal is a measured response to changes in physical phenomena, such as sound, light, temperature, position, or pressure, and is achieved using a transducer. For example, in sound recording, fluctuations in air pressure (that is to say, sound) strike the diaphragm of a microphone which causes corresponding fluctuations in a voltage or the current in an electric circuit. The voltage or the current is said to be an "analog" of the sound. Since an analog signal has a theoretically infinite resolution, it will always have a higher resolution than any digital system where the resolution is in discrete steps. In practice, as analog systems become more complex, effects such as nonlinearity and noise ultimately degrade analog resolution such that digital systems surpass it. In analog systems, it is difficult to detect when such degradation occurs, but in digital systems, degradation can not only be detected but corrected as well. Disadvantage The primary disadvantage of analog signaling is that any system has noise - i.e., random variation. As the signal is copied and re-copied, or transmitted over long distances, these random variations become dominant. Electrically, these losses can be diminished by shielding, good connections, and several cable types such as coaxial or twisted pair. The effects of noise make signal loss and distortion impossible to recover, since amplifying the signal to recover attenuated parts of the signal amplifies the noise as well. Even if the resolution of an analog signal is higher than a comparable digital signal, in many cases, the difference is overshadowed by the noise in the signal Digital The term digital signal is used to refer to more than one concept. It can refer to discrete-time signals that are digitized, or to the waveform signals in a digital system. Digital signals are digital representations of discrete-time signals, which are often derived from analog signals. An analog signal is a datum that changes over time-say, the temperature at a given location; the depth of a certain point in a pond; or the amplitude of the voltage at some node in a circuit that can be represented as a mathematical function, with time as the free variable (abscissa) and the signal itself as the dependent variable (ordinate). A discrete-time signal is a sampled version of an analog signal: the value of the datum is noted at fixed intervals (for example, every microsecond) rather than continuously. If individual time values of the discrete-time signal, instead of being measured precisely (which would require an infinite number of digits), are approximated to a certain precision-which, therefore, only requires a specific number of digits-then the resultant data stream is termed a digital signal. The process of approximating the precise value within a fixed number of digits, or bits, is called quantization. In conceptual summary, a digital signal is a quantized discrete-time signal; a discrete-time signal is a sampled analog signal. In the Digital Revolution, the usage of digital signals has increased significantly. Many modern media devices, especially the ones that connect with computers use digital signals to represent signals that were traditionally represented as continuous-time signals; cell phones, music and video players, personal video recorders, and digital cameras are examples. In most applications, digital signals are represented as binary numbers, so their precision of quantization is measured in bits. Suppose, for example, that we wish to measure a signal to two significant decimal digits. Since seven bits, or binary digits, can record 128 discrete values (viz., from 0 to 127), those seven bits are more than sufficient to express a range of one hundred values. Summary: Digital communication systems offer much more efficiency, better performance, and much greater the flexibility. Analog in a watch is where you have to read the numbers. Digital shows the numbers for you. a digital signal is what a computer system is based around; mainly zeros and ones / or noughts and ones as illustrated. a zero equates to zero volts approx . a one ( logic ) is 5 volts +_ a tolerance value. but there is limited range of signal in between these 2 points. a measured value of 2.5 volts would not be equal to either a logic 1 or nought . .... when a circuit / usually a transistor device switches on or off the voltage at its terminal usually changes from zero to 5 volts or logic 1 . the digital circuit only recognizes values at or around these 2 points and interprets them as a logic 1 or 0. .. in the case of the analog signal, the value could change between a negative value to positive or from zero to a positive value, within the supply constraints and still be recognized.
When you set the tv to get stations fron an analog receiver all you get is snow on the tv why?
As of June of 2008, Congress passed approval for the digital tv transition. The purpose of this was to free analog signals currently used for television stations for emergency vehicles, like police and ambulances to be able to communicate more effectively and efficiently during an emergency. You can still view television shows by doing one of the following: 1. Purchase a digital television (either standard or high definition SDTV or HDTV) and connect your antenna to that. 2. Purchase a digital to analog converter box and connect that to your analog tv and antenna. 3. Get cable or satellite service.
What do converter boxes do exactly?
TV converter boxes allows you to pick up digital broadcasting viz an analog TV. As of February 17, 2009, the National Telecommunications and Information Administration ceased all analog transmission, the signals which you could pick up with an antenna connected to a TV. As of 2008, the NTIA began sending out coupons to any and all families in the US, who requested, a coupon for a free converter to make the switch form analog to digital communications transition smoother for the US.
Can you turn your analog police scanner digital with a converter box?
No, a television converter box will not work on a police radio scanner. There is currently no way to make this conversion. One cost-effective method of listening to digital police, fire and other communications without purchasing a digital police scanner is through the download and installation of a free smartphone application which receives digital transmissions. There are many available for both Android and iPhone.
Why are some converter boxes some cheap some expensive?
A Digital Television (DTV) Converter Box is an electronic device that converts the new free over-the-air digital signal into an analog signal viewable on older "analog" television set. The digital to analog converter box connects your antenna or rabbit ears to your TV set. It will allow you to continue watching TV after February 17, 2009, the day the transition to "all digital" takes place. A digital to analog converter box will not give you a digital picture on an analog TV set. Analog TV sets using the set top boxes will show digital broadcasts, but not in the full picture quality of digital TV. However, your picture will be better than it was with the old analog signal. Technically speaking about picture quality: The reason the picture quality won't be as good on an analog TV set is because of the display resolution. Analog TV screens aren't designed to display the same level of picture quality and resolution that is found in the digital TV signal.
