What are the needs for conversion between analog and digital data?

Answer 1

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.

Answer 2

Analog by means is a continuous information, where as digital is discrete/digitized information. To process a continuous information it really takes a large effort and high processing circuits that dissipate high power. The same processing can also be done efficiently by not processing the continuous information, but by using the discrete parts of it (Proven by sampling theorem). So you can get the almost equivalent post processing information as that of the continuous information by using the digital/discrete processing. By using digital version, it is much easier to process systems as the computation involved mostly 1s and 0s and the amount of total power/computational complexity is less. So its better to conver Analog into DIgital before processing.

Answer 3

Most real world signals are analog in form. Sound and light have infinite values without distinct, separate levels. People are very good at seeing and hearing these signals and interpreting them. Computers on the other hand are not designed to handle analog signals. As computers store and manipulate numbers, analog signals need to be converted to a number form before a computer can deal with them.

An analog to digital converter is the device that performs the task. It evaluates a voltage that represents the signal level and converts it into a number. For audio, the number will be in the range 0 - 64,000 with a 16 bit binary number or 1 - 16,000,000 with a 24 bit binary number. Video will use a value up to 1000 using 10 binary digits for each of the three signals. The end result for video is a range of many millions of colors.

A to D converters sample the analog level fast enough to capture the changes in level as they happen. The process repeats and the numeric data can be stored or passed to other devices as a stream of numbers.

The great advantage of using numbers is that they can be stored accurately. It doesn't matter how often they are stored, copied or sent to other devices, the numbers will remain intact. At the end of the signal chain, the numbers can be converted back to analog signals to be displayed on each pixel of a television screen or amplified before being sent to loudspeakers. Although there are some tiny quality losses as the signals are first converted to digital, there will be no more loss of quality throughout the complete signal chain.*

*The description of the signal chain does not take into account the compression that is normally used in both video and audio signals. MP3 and MP4 formats compress the amount of data to make it easier to store and transmit. There are some additional quality losses in this process but ideally, the losses will not be noticeable for normal viewing and listening purposes.

Answer 4

It is very difficult to deal with analog signals,their processing is also cumbersome.The digital signals can be stored whereas analog signals can't be stored.Hardware required to process analog signal is complex.Digital signals have higher noise immunity than that of analog.

Answer 5

An Analog to Digital Converter (ADC) is a device for converting an analog signal (current, voltage etc.) to a digital code, usually binary. In the real world, most of the signals sensed and processed by humans are analog signals.

Answer 6

because the analog signal con read computer and this work to convert to digital language human needed

Answer 7

no need