Analog-to-Digital Conversion of Audio

I. Introduction (Title 1) Digital signals have changed the world today, and in some areas it is as common as the music industry. Today's analog-to-digital converters allow us to accurately preserve the physical and analog phenomena of sound as digital data with fidelity and perfect reproduction quality [1]. Digital audio storage is more practical than analog audio storage for consumers and professionals. Digital audio is not influenced by noise, unlike not only uneven distribution of noise, unlike analog audio which can not be distinguished from original information [necessity].

A common example of a DAC is for audio. For example, if you are using a smartphone, the audio is converted from analog to digital, then sent in digital form to the receiving phone wirelessly. After receiving the phone, convert the digital data to analog audio and send it to the speaker.

In the photo above, you can see several computer chips. Let's talk about the role of individual chips. The analog-to-digital conversion and the digital-to-analog converter convert the output audio signal from analog to digital and convert the input signal from digital to analog. For the importance of A / D conversion, DA conversion, and digital audio, see "How disks work". The Digital Signal Processor (DSP) is a highly customized processor designed to perform signal processing calculations at high speed.

Digital recording uses the digital representation of the actual frequency and amplitude of the audio signal. "(Alten) There are analog and digital processing when recording in digital. These steps include "inputting analog signals into anti-aliasing (low-pass filter), then simple holding", analog-to-digital conversion, data encoding, error correction, recording modulation, and data recording (tape, disk) . (Alten) This is a long process, but you can modify, change and add sounds.

The sense of digital attenuation is very different from analog attenuation. When there is a problem with analog audio, it is stretched, noisy or distorted: imagine an overloaded guitar, a vinyl record of a player with a worn band, or an AM radio on a snowy day. However, all modern digital devices like the iPhone do not do this. When they break, the sound will be awkward cut off, or the most common thing is that it stops playing. It is similar to the visual effect. Contemporary digital graphics fall apart due to glitch color blocks, content is transferred to another part of the screen, and the frame freezes. A YouTube video on a bad Wi-Fi network. Trapped rows instruct you to pay attention to the road maintenance of digital highway signs. Or Pac-Man's notorious "killing screen" - crap, but crap renders with full clarity of previous level reasons