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How are digital signals in radio broadcast converted to analog signals inside digital transmission equipment before sending the signals to the antenna for transmission?
The digital signals is not converted BACK to analog! it is transmitted in digital form and the receiver is converting it back to analog to drive the speakers. The signal from the microphone is converted from analog to digital with an A/D converter chip, digital signals consist of pulses of different lengths that is switching the transmitter on and off in about the same way as the old Morse code transmissions but at a much higher rate (millions of times higher)
What are the Conclusion of analog and digital multimeter?
The only different is one has a needle, the other digital numbers-same as with analog and digital watches.
Difference between analog and digital control systems?
An analog control system is one that presents data by measuring a continuous variable. This reports the data back in voltage or pressure.
What are the advantages of digital data compared to analog data?
Digital data requires less bandwidth than analog data (e.g. new digital television broadcast compared to old analog broadcast), so more data can fit in the same frequency (e.g. DSL compared to analog modems). This is the primary advantage, although it is also generally stated that data is easier to recover and more tolerant towards interference.
Why is a digital signal higher quality than an analog signal?
Digital signals allow error-correction to be encoded into the signal thus ensuring high-quality transmissions over a much greater distance than would be possible with analog transmissions. Digital signals have a much higher rate of transmission, with fibre optic providing the optimum transmission rate. Digital signals use less bandwidth, thus allowing a greater number of independent transmission channels over a given band of frequencies with no cross-talk between channels. Digital signals can interleave audio, video and data in the same signal. This is what makes it possible to access the internet through your telephone line and make voice calls at the same time. Digital signals are easier to encrypt.
How are digital signals in radio broadcast converted to analog signals inside digital transmission equipment before sending the signals to the antenna for transmission?
The digital signals is not converted BACK to analog! it is transmitted in digital form and the receiver is converting it back to analog to drive the speakers. The signal from the microphone is converted from analog to digital with an A/D converter chip, digital signals consist of pulses of different lengths that is switching the transmitter on and off in about the same way as the old Morse code transmissions but at a much higher rate (millions of times higher)
Why digital signals are more noise free than analog signals?
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
Why do you have to get digital television?
Older TV sets use analog signals. In February, all TV signals that are now analog will become digital because it gives more efficient use of the bandwidth. Analog sets will not receive and interpret the images from a digital transmission. It's the same reason you can't use your old TV as a computer monitor.
What video types support or carries both analog and digital signals?
Analog and digital video signals don't mix well so there are few interfaces that handle both. HDMI is purely digital and has no capacity to carry analog signals. RCA, phono or scart connections are analog with no provision to carry digital video. In broadcast studios, 75 ohm co-ax cable is used almost exclusively to carry video. The same cables will carry analog video or digital video depending on what they are connected to. The decision to make broadcast digital signal run on the same cable as analog video has greatly smoothed the transition to digital broadcasting. As far as domestic video is concerned, the only dual standard interface that is recognized is the DVI connector. Primarily a computer display interface, it carries digital video but will also handle analog VGA signals on the same cable. Furthermore, the two signals can be carried simultaneously and can be the same or different images. As the digital video component of a DVI interface is compatible with the video component of HDMI, it can carry broadcast signals as well as computer display data so it can be described as a video cable. Note that although DVI and HDMI are compatible, DVI does not carry the audio element of the signal whereas the HDMI interface does.
How are digital and analog signals similar?
They both convey differences in voltage level. An anologue signal can send any level between limits. A digital signal only sends two different levels, one represents a 1 or high level, the other represents 0 or low level.
Why are so many newer TVs without analog audio outputs or headphone jacks?
For the same reason that new TVs no longer use analog video signals. Everything is switching to digital.
What are the Conclusion of analog and digital multimeter?
The only different is one has a needle, the other digital numbers-same as with analog and digital watches.
Difference between analog and digital control systems?
An analog control system is one that presents data by measuring a continuous variable. This reports the data back in voltage or pressure.
Can it possible the Analog to digital converter transforms a group of discreet numbers into a continuous analog voltage?
Well you can use Digital-Analog Converter to do the same operation.
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 is a digital audio Jack?
A digital audio jack serves the same purpose as an analog audio jack, only it transmits a signal that is digital (1s and 0s) instead of analog (waveform).
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.
