Abstract: This paper analyzes the application of digital signal processing (DSP) technology in multiple fields based on theoretical analysis, elaborates on the current application areas and market prospects of DSP, and looks forward to the development prospects of digital signal processing technology.
Keywords : Digital signal processing; Graphics and images; Electronic systems; Development prospects
Analysis of Innovative Application and Prospect of DSP Technology
Wu-Lei
(Henan Polytechnic University, Jiaozuo 454000, China)
Abstract: In this paper, mainly analysis of the application of digital signal processing (DSP) technology in several fields based on theory, describes the application of DSP in the present application fields and market prospects, and prospects the development of digital signal processing technology in the future.
Key words: Digital signal processing; graphic images; electronic systems; development prospects
1 Introduction
DSP stands for Digital Signal Processor, a dedicated processor that performs high-speed real-time processing after analog signals are converted into digital signals. Its working principle is to convert analog signals in the real world into digital signals, and then process the signals using mathematical methods to obtain the corresponding results. Since the advent of Digital Signal Processor, due to its high speed, flexibility, programmability, low power consumption and easy interface, it has played an increasingly important role in fields such as graphics, image processing, speech and language processing, general signal processing, measurement analysis, and communication. With the reduction in cost, the control community has developed a strong interest in it and it has been successfully applied in many situations. DSP digital signal processor DSP chips adopt the Harvard architecture with separate data bus and program bus and the improved Harvard architecture, which has a higher instruction execution speed than the von Neumann architecture of traditional processors. Its processing speed is 10-50 times faster than the fastest CPU. In the context of today's digital age, DSP has become a basic device in fields such as communication, computers, and consumer electronics, and is hailed as the "flag bearer" of the information society revolution [1].
2. The Development History of DSP Technology
The development of DSP can be roughly divided into four stages: the first stage was theoretical development in the 1970s, the second stage was product popularization in the 1980s, the third stage was rapid progress in the 1990s, and the fourth stage was a new era of brilliance in the 21st century.
Before the advent of DSPs, digital signal processing could only be accomplished using MPUs (microprocessors). However, the relatively low processing speed of MPUs could not meet the requirements of high-speed real-time processing. Therefore, in the 1970s, the theoretical and algorithmic foundations of DSPs were proposed. However, DSPs remained largely confined to textbooks, and even the DSP systems that were developed were composed of discrete components, limiting their applications to military and aerospace sectors.
With the development of large-scale integrated circuit technology, the world's first DSP chip was born in 1982. This DSP device was fabricated using micron-scale NMOS technology. Although its power consumption and size were slightly larger, its processing speed was dozens of times faster than that of an MPU, and it was widely used, especially in speech synthesis and codecs. The advent of the DSP chip marked a major step forward in the miniaturization of DSP application systems. With the advancement and development of CMOS technology, the second generation of CMOS-based DSP chips emerged, with significantly increased storage capacity and processing speed, becoming the foundation for speech processing and image hardware processing technologies. In the late 1980s, the third generation of DSP chips appeared, further improving processing speed, and its applications gradually expanded to the fields of communications and computers.
The DSP developed the fastest in the 1990s, and the fourth and fifth generation DSP devices appeared one after another. The current DSP belongs to the fifth generation product. Compared with the fourth generation, it has a higher system integration and integrates the DSP core and peripheral components on a single chip. This highly integrated DSP chip not only plays a great role in the fields of communication and computer, but also gradually penetrates into people's daily consumer fields, and its prospects are very promising[2].
2. Innovative Applications of DSP Technology in Various Fields
2.1 Applications in the field of communications
In recent years, with the rapid development of communication technology, DSP has become a very important emerging discipline in the field of signal and information processing. It represents the mainstream development direction of today's wireless systems. Now, many products in the communication field are closely related to DSP, such as modems, data encryption, spread spectrum communication, video phones, etc. The initial goal of finding DSP chips to implement algorithms is to simulate the algorithms within an acceptable time, then store the waveforms, and then process them. Figure 1 shows a typical DSP application system. Digital cellular phones are the most important application area of DSP. Because DSP has powerful computing capabilities, mobile communication cellular phones have re-emerged and created a number of fully digital cellular phone networks such as GSM and CDMA [3]. Due to the use of DSP technology, the upgrading of cellular phones has become easier. On the basis of a unified hardware platform, various new mobile phones can be produced through continuous software upgrades.
The input signal is first band-limited filtered and sampled, then converted from analog to digital to form a digital bit stream. According to Shannon's sampling theorem, to prevent information loss, the sampling frequency must be at least twice the highest frequency of the input band-limited signal.
2.2 Applications in the field of instrumentation
DSPs have already entered the measurement and testing instrument industry, and are showing a strong trend of replacing high-end microcontrollers. Developing measurement and testing instruments using DSPs can elevate products to a whole new level. The abundant on-chip resources of new DSPs can greatly simplify the hardware circuitry of instruments, enabling the design of SOCs (System on Chip) for instruments.
Measurement accuracy and speed are crucial indicators for instruments and meters, and developing products using DSP chips can significantly improve both. Taking the TMS320F2810 as an example, its efficient 32-bit CPU core, excellent 12-bit A/D converter, abundant on-chip memory, and flexible instruction set provide a broad platform for developing fast and high-precision instruments.
DSP is currently in a period of rapid development, and instrumentation is an important application area for DSP. It is believed that the application of DSP will promote the technological innovation of instrumentation.
2.3 Applications in the PC Field
Programmable multimedia digital signal processors (DSPs) are mainstream products in the PC field. The combination of high-speed communication technology, exemplified by xDSL modems, and MPEG image technology enables real-time exchange of high-quality audio and video data. It is anticipated that in future PCs, a single DSP will be sufficient to handle all necessary multimedia processing functions.
2.4 Applications in New Digital Hearing Aids
Due to the limitations of traditional hearing aid circuitry, it cannot meet the needs of most hearing-impaired patients. This task naturally falls to fully digital hearing aids. Abroad, hearing aid technology is gradually replacing traditional electronic amplifier circuits with digital signal processing (DSP). DSPs possess powerful processing capabilities, enabling hearing-impaired patients to hear clearer, more desirable sounds while eliminating unwanted sounds, thus representing a qualitative leap in modern hearing aid technology. Digital signal processing is the core component of fully digital hearing aids. It provides great flexibility for adjusting input/output characteristics and the system's frequency response.
2.5 Applications in the field of graphics and image technology
The MPEG2 encoder/decoder used for moving image compression/decompression in DVDs is also widely used in video-on-demand (VOD), high-quality cable television, and satellite broadcasting. In these fields, the DSPs used require higher processing speeds and capabilities. Furthermore, moving image compression/decompression technologies are constantly evolving. For example, DCT transform domain coding struggles to improve compression ratios and reconstructed image quality, leading to the development of wavelet analysis-based image compression methods guided by visual perception characteristics. The emergence of new algorithms demands correspondingly high-performance DSPs. Recently, Japanese universities and high-tech companies have invested considerable resources in developing virtual reality (VR) systems, utilizing modern computer graphics (CG) to generate 3D graphics, urgently requiring parallel processing systems with multiple DSPs. The node DSP units within these systems must employ an architecture adapted to parallel processing.
2.6 Automotive Electronic Systems and Other Application Areas
The automotive electronic systems are becoming increasingly sophisticated, with technologies such as infrared and millimeter-wave radar requiring DSP analysis. With the growing number of cars on the road, collision avoidance systems have become a hot research topic. Furthermore, image data captured by cameras needs to be processed by DSP before it can be displayed in the driving system for driver reference. The applications of DSP are countless; DSP devices are widely used in video conferencing systems and audiovisual equipment. With the advancement of science and technology, many new application areas for DSP will emerge.
3. Development Prospects of DSP Technology
Currently, the DSP market is in a phase of rapid growth. Driven by digitalization, personalization, and networking, the global DSP market revenue exceeded US$80 billion in 2009, and the projected annual growth rate is as high as 40%. In the global DSP market, the US alone is estimated to have over 100 million cars, tens of millions of personal communication devices, 5-20 networked home appliances per household, and millions of factories using DSP systems. China has become the largest market for DSP chips, with the booming sales of digital cameras, IP phones, and handheld electronic devices creating huge demand for DSP chips. Although the DSP market is maturing, there is still room for growth. The internet and device personalization are characteristics of today's information society. The internet is a new growth point for the global economy in the PC era. Since the PC market is still unsaturated, its market potential is enormous, representing a potential application area for DSPs. Mobile phones, PDAs, MP3 players, and laptops are typical examples of device personalization, and the development level of these devices depends on the development of DSPs. Under the new circumstances, DSPs face the requirements of higher processing speeds, more and more comprehensive functions, lower power consumption, and less memory usage. The technological development of DSPs will likely follow the following trends:
(1) System-level integrated DSP is the trend. Small DSP chip size has always been the technological development direction of DSP. Current DSPs are small in size, low in power consumption and high in performance. Various DSP manufacturers have adopted new processes, improved DSP cores, and integrated several DSP cores, MPU cores, dedicated processing units, peripheral circuit units and memory units all on one chip, which has become DSP system-level integrated circuits.
(2) Pursuing higher computing speed and further reducing power consumption and geometric size [4]. Due to the personalization and customization of electronic devices, DSPs must pursue higher and faster computing speeds in order to keep up with the pace of electronic device updates. At the same time, since the application scope of DSPs has expanded to all areas of people's work and life, especially portable handheld products, which have high requirements for low power consumption and size, DSPs need to further reduce power consumption. According to the development trend of CMOS, it is entirely possible to improve the computing speed and reduce power consumption and size of DSPs by relying on new processes to improve chip structure.
(3) The core structure of DSPs has been further improved [5]. The structure of DSPs is mainly for applications, and the DSP design is optimized according to the application to greatly improve the performance of the product. Multi-channel structure and single instruction multiple data (SIMD), very long instruction word (VLIM), superscalar structure, super pipelining structure, multiprocessing, multithreading and parallel scalable super Harvard structure (SHARC) will dominate in the new high-performance processors.
(4) DSP Embedded System [5]. A DSP embedded system is a general-purpose system that embeds a DSP system into an application electronic system [4]. This system has both the advantages of DSP devices in data processing and the technical characteristics required by the application target. In many embedded application fields, there is a need for both DSPs with unique advantages in data processing and microprocessors (MCUs) with superior skills in intelligent control. Therefore, a dual-core platform that integrates DSP and MCU will become a new trend in the development of DSP technology.
4. Conclusion
The development of DSP technology is currently progressing rapidly, and its application areas are like a vast gold mine, far from being fully explored. Attention to digital signal processing problems remains a prevailing trend in the industry. Every day, we open a new magazine and see reports on the latest developments in DSP technology. The arrival of digitalization presents both opportunities and challenges. We believe that the development and application of DSP technology will have a greater impact on our work, lives, and perspectives, making it well worth striving for.
References
[1] Peng Qizong, Li Yubai, Guan Qing. Development and Application of DSP Technology [M]. Higher Education Press, 2007.
[2] Zhang Xiongwei, Chen Liang, Xu Guanghui. Principles and Development Applications of DSP Chips (3rd Edition) [J], Beijing: Electronic Industry Press, 2003.2.
[3] Shen Min. DSP Principles and Their Applications in Mobile Communication [M]. Posts & Telecom Press, 1999.
[4] Zhang Zhide. Single-chip signal processor and its application [J]. Electronic Engineering Information, 1987, (7).
[5] Xu Wei. The structure and development direction of DSP applications [J]. Electronic Technology Application, 1999.
About the author: Wu Lei (1984-), male, Han nationality, from Shangqiu, Henan Province, is a master's student at Henan Polytechnic University, mainly engaged in the research of precision and ultra-precision machining technology.
Mailing Address: Wu Lei, P.O. Box 1241, Henan Polytechnic University, Jiaozuo City, Henan Province, 454000, China
E-mail: [email protected]
Contact number: 15138007502
