Audio and video are objective, natural sounds and pictures as far as possible to capture, and then through the eyes and ears input in the human brain, to achieve subjective presentation.
As a human capture of nature, it can only infinitely approach the truth, and cannot achieve 100% the same as reality, which is the limitation of human beings, which is also the limitation of human use of tools.
At present, the use of the most top-of-the-line equipment to save sounds and images in nature this order of magnitude is huge, such as the collection of a sound its complete details may reach 5-100000Hz or even more, and the human ear can hear the range of 20-20000Hz, so when people make music in the studio, the rest of the frequency is technically omitted, and then the effect of 3-5MB size of a song can be achieved.
The smallest particle of the video is the pixel, the camera takes a photo, how to reflect the clarity of its picture refers to this indicator. A 4K photo has a resolution of 3840x2160 for a total of 8294400 points, while a 2K photo has a resolution of 1920x1080 for a total of 2073600 points. So 4K is four times sharper than it is.
Sound is reflected in the data is the size of its frequency range; images and videos are reflected in the data is the size of their resolution. When people convert the things native to nature into digital data, a series of follow-up operations such as codecs begin...
People get a video footage from nature, he not only wants to enjoy it locally, but also wants to share this video with distant relatives and friends, which involves a transmission problem. The network is like a pipeline, data is like water, the biggest problem encountered at present is that the throughput is not large enough, 2G, 4G, 5G is to solve this problem, the water flow is getting bigger and bigger, the water flow speed is getting faster and faster... People around the world are shooting and sharing one of their own audio and video videos in the pipes of the Internet.
Sometimes in some formal institutional meetings, the transmission of video and audio pictures may also require the characteristics of fast speed, low latency and high definition to ensure normal communication among participants. Therefore, the technology company has done technical processing in the middle, so that the packet at the time of audio and video departure is small enough to ensure the speed of transmission in the network traffic, and after arriving at the destination, the packet is restored to the original size, and the process is not distorted. This is the codec technique, which begins with encoding and ends with decoding.
Natural sound images, from being produced to being seen and used by people, to what they look like in electronic digital products is this process.
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