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Analog signals can't be compressed as well as a digital signal can. To transmit an image on analog television, every pixel is included in the signal. A standard NTSC screen includes 525 lines of 720 pixels, for a total of 378,000 pixels per frame. That's a lot, but it fits into the 6MHz bandwidth of a television channel. Japanese HDTV takes 20 MHz of bandwidth to send pictures with over 675,000 pixels. That's over two times as much signal to send a high definition picture and higher quality sound, but no other data.
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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
Which device is used to convert digital signals to analog signals or analog signals to digital signals?
The set top box that your provider gives you is what converts the Digital signal to the analog signal. The digital signal is compressed at the provider and sent to the end user. The "tuner" (which can be built into a tv, a set top box or a cable card) Then decompresses the digital signal and converts it into an analog signal. There is much more to this did not know how technical you wanted your answer.
Why are digital system capable of accuracy than analog system?
1.having low noise as compare to analog. 2.using TDMA Iinstead of FDMA techniques used in analog. 3.in digital signals regenrative repeaters are used at every regeneration point of the signals so low loss of signals are there as compare to analog signals
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 is the difference between digital and analogs?
In chemistry, analog is a compound with a molecular structure closely similar to another. Analog is also relating to or using signals or info represented by a continuously variable physical quantity such as spatial position or voltage. Analog is often contrasted (opposite) of DIGITAL --like a clock showing the time represented by "hands" instead of being Displayed DIGITS.
Why must sound card and video on a PC be converted from analog to digital?
Primarily because digital systems are more accurate. Additionally, digital technology is replacing older systems with modern devices because digital devices are often much smaller, and require less maintenance.
Why analog circuit has much noise than digital circuit?
Data regeneration is not possible in analog circuits.Signals has degeneration and distortion so it causes noise.But in digital circuit signals are quantizated and regenerated even if they had corruption.
Why does signal processing in digital mode?
You can process signals with many analog circuits. The advantage of Digital Signal Processing, is that once you have represented the signal in a digital form, you can use a computer program to perform much more complex operations on the signal than could be accomplished with an analog circuit. Such examples are noise cancellation and compression. With the recent advent of 'Digital TV', the stations can fit more information into a smaller 'bandwidth' through compression (much as you might ZIP a large file before emailing it), allowing for delivery of more content.
What part of the telephone network depends on analog signals?
In traditional telephone networks, the local loop, which connects individual homes and businesses to the central office, primarily relies on analog signals. These analog signals transmit voice communications over copper wire. While much of the backbone and long-distance transmission has shifted to digital formats, the last mile connection often still uses analog technology, especially in legacy systems. However, many newer systems are transitioning to digital methods for improved efficiency and quality.
What is the difference between analog and digital data transmission?
This is essentially the same question as the difference between analog and digital. With analog electronics a voltage is used to represent (or to be an analogy for) some physical attribute in the real world. So for an analog transmission, at its simplest, a sound signal (say) is converted to a voltage, the voltage sent down a cable, then at the other end the voltage converted back into sound with a loudspeaker. With a digital system, the physicial attribute is measured and sent as a series of numbers, the numbers being converted to binary. For a digital transmission, the sound signal is converted to a series of numbers, sent as binary, and converted back to a sound signal at the other end. The advantages of digital is that it makes multiplexing much easier - making it easier to put many signals down the same physical cable. It also makes compressing the signal much easier - this is particularly effective for digital television transmission; 30-40 digital channels can be sent over the same bandwidth as 4 or 5 uncompressed analog channels. Also, digital is much more resiliant against noise - the digital receiver has to make a decision about each bit - is it there or not; noise can be pretty extreme before this becomes impossible, with analog, once noise is added its very difficult to remove it. The historical disadvantage of digital is that digital encoding and decoding equipment was expensive compared with the analog. Over the last 10 years or so, digital electronics has become much cheaper and more powerful.
Why can't i get PBS in kansas using antenna?
Unless you have a digital converter you can't get any transmissions by antennae. Digital transmission has a much shorter range than the former analog transmissions did by about 50%. So, if you had gotten PBS by antenna before 2006 and can't now, with a digital converter, it may be that the station is more than 50 miles away, and the transmission no longer reaches your area. Cloud cover doesn't help digital signals, the way they did analog signals, either, in extending transmitting distances beyond the normal range.
How digital cable TV works?
A signal is sent through the cable at a much higher frequency than regular cable. Additional data is sent in this signal to support the original audio and video signals to ensure that they are received in much better quality than analog signals. This additional data and the type of signal sent is what allows the quality to be so much better than older analog signals.
