In electronic technology, signals transmitted, processed and processed can be divided into two categories: one is analog signals, which are characterized by continuous changes in time and signal size, and the technology used to transmit, process and process analog signals is called analog technology; Another kind of signal is a digital signal, which is characterized by being discrete or discontinuous in time or size. The technology of transmitting, processing and processing digital signals is called digital technology.
Compared with analog technology, digital technology has the following characteristics:
(1) In digital technology, binary is generally used, so binary can be represented by any two stable states of elements (such as "high level" and "low level"). Therefore, its basic unit circuit is simple, and the accuracy of each component in the circuit is not strict, allowing the component parameters to have greater dispersion, as long as two completely different States can be distinguished. This characteristic is very beneficial to the integration of digital circuits.
(2) Strong anti-interference ability and high precision. Because digital technology transmits and processes binary information, it is not easy to be disturbed by the outside world, so it has strong anti-interference ability. In addition, the accuracy can be improved by increasing the number of bits of binary numbers.
(3) Digital signals are convenient for long-term storage, and can store a large number of valuable information resources.
(4) Good confidentiality, which can be encrypted by digital technology, making some valuable information resources difficult to be stolen. (5) It is universal and can be used to form various digital systems with standardized logic elements.
Due to the above characteristics and rapid development, digital technology has been widely used in electronic digital computers, numerical control technology, communication equipment, digital instruments and other national economic departments.
What we usually call "digital" refers to digital products containing "digital technology", such as digital cameras, digital video cameras, digital walkman, etc. With the development of science and technology and the emergence and development of computers, a number of products with numbers as recording marks have appeared, replacing traditional movies, videos, tapes and so on. We collectively refer to this kind of products as digital products.
Digital camera:
Digital camera, English full name: Digital Still Camera (DSC), short name: Digital Camera (DC), short name of digital camera, also known as digital camera. Digital camera is a kind of camera that uses electronic sensors to convert optical images into electronic data. According to the use, it is divided into: SLR camera, card camera, telephoto camera and household camera.
The working principle of digital camera:
Digital camera is a product integrating optics, machinery and electronics. It integrates image information conversion, storage, transmission and other components, and has the characteristics of digital access mode of BenQ digital camera C850, interactive processing with computer, real-time shooting and so on. Light enters the camera through a lens or lens group, and is converted into a digital signal through an imaging element, and the digital signal is stored in a storage device through an image operation chip. The imaging element of digital camera is CCD or CMOS, which is characterized in that when light passes through it, it can be converted into electrical signals according to different light.
Advantages of digital cameras:
1. You can see the picture immediately after taking a picture, which provides the possibility of remaking the dissatisfied work immediately and reduces the occurrence of regrets. Just pay for those photos you want to develop, and other unnecessary photos can be deleted. 3. Color reproduction and color range no longer depend on the quality of the film. 4, the sensitivity is no longer fixed by the film, and the photoelectric conversion chip can provide a variety of sensitivity choices.