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How to change digital signals to analog signals and again from analog to digital signals?
Wiki User
∙ 12y ago
modem
Measuring usually the voltage of the analog signal many times a second in binary number code generates a digital signal,
and using a binary number code to control the voltage of an output results in a reproduced analog signal.
That is what is done for stuff like digital television.
A Modem (prior answer) is for when the analog signals are used to connect digital computers (like yours) together, usually over a long distance.
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∙ 12y ago
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What is the term for a device that converts digital data from a computer into analog signals and back again?
The devices are known very simply as analog to digital converters and digital to analog converters. They are frequently shorted to A-D and D-A converters. A complete analog to digital converter will not only convert the analog signal into a set of numbers, it will also format the digital data ready to deliver to the next step in the signal chain. In television, this means generating a fairly complex stream of data that will carry not only the picture but audio and other data as well. Digital to analog converters reverse the process and use the incoming data to generate an analog signal. In television, well know examples are the digital set top boxes. They receive digital data from an antenna and convert the numbers into analog audio and video signals.
Can you convert a TV to digital TV?
It is not possible to convert an analog television to a digital television. However, by using a digital set top receiver, it is possible to receive digital signals and deliver them as an analog signal to an analog television. Digital receivers are not expensive, starting at around $25 in US and £20 in the UK. They will allow all terrestrial channels to be received in the same way that a digital television will. Cable and satellite receivers can also receive digital signals and will provide an analog output that can be used with older televisions. With these options, there is no need to replace analog televisions right away. Remember that analog only televisions will not be HD so don't expect a sudden increase in picture quality when the digital receivers are used.
How do you convert the analog fuel level indicator into digital in cars?
A: By adding an ADC analog digital converter but then again false triggering and monotonic and other errors makes this approach not desirable. unless heavily filtered the numbers will just rolls by filtering you get back again to analog response.
What are defrances between analog and digital?
The differences between analogue and digital is in the transmission of signals. Analogue technology will transmit a signal wave in its original format but in digital technology, the analogue wave is sampled and turned into numbers which are stored in digital devices.
What is the best signal between analog and digital?
This is a difficult question to answer. Digital signals in television and audio are hailed as the "best" quality but there are many factors that affect the quality of both analog and digital signals. Digital signals are not prone to quality loss once they are in a digital form. The data that makes up the signal can normally be stored, transmitted and received without error so the quality will be identical from start to finish. Analog signals can suffer from interference and losses which increase with the length of transmission line and with every active process used as the signal is stored and delivered. Therefore, in terms of quality loss, digital is likely to be the better medium. Digital signals in video and audio are frequently compressed. Raw HD data needs a data rate of 1500 megabits per second but broadcasters frequently compress an HD signal to as little as 6 megabits per second. The compression process inevitably results in a loss of detail and a loss of quality. SD data rates are 270 megabits as an uncompressed signal but are compressed to as little as 1-2 megabits for broadcast. Again, the signal quality suffers. Analog signals are always broadcast as full bandwidth signals so they do not suffer from quality loss due to compression. The final judgment regarding the best signal must be based on the quality of image seen. Without doubt, digital signal processing can deliver quality that most analog signals can never achieve but in reality, that is not always the case. Highly compressed digital television signals can often show a variety of unpleasant effects such as jerky movement and large blocks of the image without detail. As broadcasters devote more bandwidth to digital signals, the quality will improve but the quality is dependent on sufficient bandwidth for each signal. There will be many differing opinions on this topic but it must always be accepted that "digital" does not automatically mean "better".
MODEM stands for?
It comes from the term MOdulator DEModulator.A modem converts a digital signal from a computer into an analog signal, so that can be transferred down a telephone line and then at the other end it is converted back into a digital signal so that it can be sent into the receiving computer. These two processes are known as modulation and demodulation.A modem is a Modulator and Demodulator. It's like a bridge between computer and ordinary telephone lines. Telephone lines only accept analog signals but computers only accept digital (binary) signals so modems help link them.The data is changed to represent 2 audio frequencies. These noises are superimposed onto a phone line audio. This is known as 'modulation'. The incoming signal of course has to be changed back again to binary data, this is known as 'demodulation'.The word modem is shorted for "Modulator-demodulator" referring to it's original use.Modem = MoDem = Modulator + DemodulatorModem is the device that modulates digital signals from Internal Network into analog signals onto analog lines towards ISP & demodulates analog signals into digital signals for use in Internal Network.
When using the 7.1 analog outputs on Panasonic dmp-bd10a to the 7.1 analog inputs on an onkyo tx-sr875 what settings do you use on the player and receiver to correctly receive dts hd master audio?
it should automate it, but the quality will be dampened when you use analog plugs; you must use digital plugs in order to use the "true hi def" signals, otherwise the unit will downgrade the signal to again, a crappy audio signal.
Pulse Position modulation is digital or not?
Pulse position modulation can be analog or digital, it depends on the signal and/or the modulator used to obtain the modulation. If an analog signal is applied at the input of the modulator, the position of the pulse can assume an infinity of different timing states (the signal vary continuously) and hence an analog modulation is realised in PPM. On the contrary if the signal is digitized previously in a series of discrete states, the pulse at the output will have discrete timing interval (not continuosly). Then a digital modulation is obtained. If the signal is analog, but the modulator is digital, we will have again a number of finite state in output timing, and the PPM will be digital. To be noted that, if the number of steps in the digital modulator, is higher then the dinamic range required, the performance of the digital and analog PPM will be exactly the same. Cecking the front of the pulse of PPM with a digital oscilloscope capable of jitter measurament, we will see immediately if the position of the pulses will be continuosly variable or a number of discrete steps will be presented. We can then consider analog and digital PPM physically different.
Simplified explanation of Digital Signal in laymen's language?
To understand what a 'digital' signal is, it is important to know about signals and how we use them. Signals exist in order to communicate. It could be between two people, two machines, a radio station and an audience or countless other examples but communication by signals is the means. Communication is accomplished by creating signals in an agreed upon format, sending those signals, and completed by interpreting the signals created. There are many types of signals; semaphor is a visual communication system where the letters of the alphabet are represented by various positions of two visible flags. Morse Code again has the letters of the alphabet represented by sequences of electrically created dashes and dots. Spoken language is an audible signal of tones connected to establish words. Though there are many possible signals, in order to best understand what a 'digital' signal is lets focus on just two of the possible signals: Analog and Digital. Communication by telephone or radio began by creating analog signals. Even though one was through wire and the other through the airwaves, they both used signals referred to as analog signals. The first radio signals used a signal method called amplitude modulation or AM. AM created different sounds by increasing or decreasing the signal strength in an up and down sort of way. It worked pretty well but didn't go through thick walls made of concrete or metal. To overcome that limitation, FM was developed. Frequency Modulation is also an analog signal but instead of increasing or decreasing the signal strength, FM varies the sounds by pushing more or less signals at the receiver in a front to back sort of way. The first television was a mix of both FM and AM signals combined to give us both audio and the visual images. Our spoken language is an analog signal picked up by our ears through airwaves. Higher pitched sounds closely resemble an FM signal and louder sounds closely resemble an AM signal. So between two people who are talking and listening, they are doing so in an agreed upon format. The words that are spoken and listened to are the signals. The means of generating and interpreting those signals are done through a process of conversion. The process begins with the brain determining what it wants to communicate. That information goes to the larynx, lungs, lips, tongue and mouth and an converted into an audible signal. When that audible signal is received by the second person, the ear converts the signal into a format the brain understands and the communication is complete. If these two people could have communicated brain to brain, none of the signal conversion would have been necessary. Regardless of their lacking for brain to brain communication, that example illustrates that a signal conversion is often necessary in order for the means to either send or receive the communication. For those early inventors who brought us the first radio, telephone and television communications they did so by designing the means of taking audible sound and visual images and converting them into an analog signal. The analog signal was necessary because wire and radio, telephone & television equipment was the means that didn't understand any other signal other than analog signals. Right after those early inventors came more inventors who improved on their inventions with new inventions. More inventors followed and in fact have never stopped coming and improving previous inventions. Out of this non-stop cycle was born the 'digital'' signal as a means of taking amongst other things, an audible sound and visual image and converting them into a means that can be understood by another machine, ultimately converted into a sound or image we can understand. The signal of an analog device such as a radio, took a variable radio wave charge into the antenna. That charge was amplified into a higher and still variable voltage and through more amplifiers and filters was converted into sound waves emitted from the speaker that our ears would receive and be converted still again into a format our brain could dance to. The language of the computer is digital signal. Where an analog signal varied up and down for AM and more or less for FM, the digital signal was either on or off. The 1's and 0's of the computer device. Just as a device isn't limited to a radio or TV for an analog signal. Digital devices aren't just computers. So when you hear the term 'digital' you're hearing the means of how that device works. The language that it speaks and must be converted into and from in order to be understood. Devices that were designed using analog technology are extraordinary, beautiful things. For many years, there were things done by analog machines that could not be improved upon by digital machines. Television is a very good example of this and for most of the time television has been around, it has relied upon analog as the signal format. This format started with the broadcasters and ended with everyone's television sets. But as the new inventors and new inventions kept coming, the digital format earned its way into television technology. The first digital televisions were able to convert analog signals into digital signals and deliver the same picture and sound quality of the analog sets. Still new inventors and new inventions and now we have significantly improved picture quality but available only in a digital format. This is why we are seeing the change in signal format from analog to digital all the way from the broadcasters to our television sets. The broadcasters have largely converted over to sending out only digital signals and most televisions sold in recent years have been digital sets capable of converting analog signals. There are those sets still in operation that are pure analog which is the reason why they need to be connected to a digital converter box. There is certainly more that could be said about a digital signal however, at a high level seeing that it is a format used to communicate and that must be converted in order to be understood, may be a good start.
What device works with continuous data?
Continuously varying data is analog data; by contrast, all digital data is discrete (there are steps between one value and the nearest next possible value). Devices operating on analog data, in context with computers, are primarily analog-to-digital converters (ADC). These take an analog input, sample this value periodically, and produce the nearest corresponding digital value for further (digital) processing. The analog input can describe a lot of different aspects: the fan speed, a temperature, an electric voltage read from a microphone or other audio input, etc. The reverse process is called digital-to-analog conversion (DAC), which converts a digital value into a corresponding analog value (typically as an electric voltage or current), which is then generally transformed into another form, such as an audio output to drive a pair of speakers. It is important to note that DAC itself does not operate continuously varying data, since the analog data generated follows the same discrete steps as the digital input data does. However, subject to the physics of the following conversion (e.g. a loudspeaker), the resulting physical signal might well be truly analog again (e.g. the variation in air pressure caused by the speaker).
What is the main function of a modem in regards to a computer?
The modem on a computer translates digital signals into an analogue 'noise', and transmits it down a telephone line. This is received by another modem at the other end, which captures the signals, and converts them back into data. It allows for transmission of digital data over an analogue telephone line.
Classification of Continuous Time signals and Discrete time signals?
we often confuse our-self with continuous time and analog signals. An analog signal is a signal which can take any amplitude in continuous range that is signal amplitude can take infinite values on the other hand a digital signal is one whose amplitude can take only finite numbers of values THE TERM CONTINUOUS SIGNAL AND DISCRETE SIGNAL CLASSIFY THE SIGNALS ALONG THE TIME (i.e. horizontal axis) where as THE TERM ANALOG AND DIGITAL SIGNAL CLASSIFY THE SIGNAL ALONG THE AMPLITUDE (i.e vertical axis)
