At this stage, environmental pollution is not just referring to water pollution and air pollution. Noise pollution is also a matter of great concern. In the practice of human prevention and control of noise pollution, two major schools of technology have gradually formed. One is passive noise reduction (also known as Physical noise reduction), one is active noise reduction (also called active noise reduction). The technical characteristics of passive noise reduction are to use various characteristics of materials to isolate noise sources, dampen and dampen the noise, etc. Passive noise reduction technology has a significant effect on high-frequency noise, but for a large number of ubiquitous low frequencies The treatment of roar is not good. In the face of low-frequency noise, active noise reduction technology has its unique advantages, and it is gradually starting to start. Especially as consumers have higher and higher requirements for mobile communications and multimedia applications, the competition for electronic products is becoming increasingly fierce. Experience has gradually become an important factor in product competitiveness, which has also contributed to the rapid growth of active noise reduction technology applications. Although active noise reduction technology has matured in some countries, the technology is still in the development stage in China, and the rapid development of the Chinese smartphone market has brought more personalized consumer demand, and major manufacturers are exploring new The market's growth point is to seek product differentiation and competitive advantages. At this time, high-performance sound quality products are particularly easy to win the market's affirmation. Original designers are actively promoting the application of active noise reduction technology in portable products. Active noise reduction technology is widely used on wired, wireless, mono and stereo accessories. According to Rob Damjanovic, sales director of Austrian Microelectronics Asia Pacific, China ’s active noise reduction application market will exceed 20% next year. The growth rate is developing rapidly, and the next five years will be a period of rapid development. Austrian Microelectronics is very optimistic about this market prospect. Laurence Zhang, general manager of the Austrian microelectronics company in China, said that active noise reduction technology uses sound as a wave characteristic, and emits reverse sound waves to hedge the original sound waves and reduce or even eliminate the noise. The characteristic of active noise reduction technology is that the volume is very small, basically does not occupy effective space, and the noise reduction efficiency is very high, especially for the large amount of ubiquitous low frequency roar in the environmental noise. The effect is particularly good! Austrian Microelectronics' active noise reduction technology is also known for its ultra-low power consumption and high performance, which are also two key points of active noise reduction technology. Ultra low power consumption and high performance are the key Noise reduction technology has been around for many years, but better algorithms, processes and methods are still being researched. But with the popularity of mobile applications, power consumption has become the focus. Through optimized integration and an analog processing process tailored specifically for active noise reduction, Austrian Microelectronics' active noise reduction solution is very power efficient and can significantly extend playback time. Data show that the evaluation based on the standard DSP codec shows that Austrian Microelectronics' solution can reduce power consumption by 2-3 times. Laurence Zhang also emphasized that although many people like digital noise reduction, AMS always believes that the effect of analog noise reduction is the best, because analog noise reduction does not have front-end sampling, compression, encoding and other processes, and there is no sound quality in the middle. The loss can guarantee the best sound quality effect. AMS has always insisted on adopting the analog noise reduction method, based on the filter-based phase adjustment and signal amplification in the analog domain, so as to meet the stringent audio fever requirements and minimize power consumption. Moreover, the integrated solution of Austrian Microelectronics includes headphone amplifier, charge pump, Line in gain control, microphone preamplifier, filter op amp, voltage monitor, interface and control, etc. The active noise reduction chip uses 4 * 4 mm Or a 5 * 5 mm QFN package can help reduce physical space and system size, and can integrate all the functions necessary for high-performance active noise reduction technology without the need for external components such as variable resistors, inductors, and oscillators. This is another major advantage of Austrian microelectronics solutions. AMS and World Health In order to promote the Chinese market, Austrian Microelectronics and World Health Corporation support the continuous development of active noise reduction technology applications with first-class technology and solid local resources. The development of a solid cooperative relationship with channel partners is an important manifestation of Austrian Microelectronics ’Chinese market strategy. Engineers at the Austrian Microelectronics headquarters regularly conduct training courses for distributor partners to help enhance the design of World Health ’s technical staff in the area of ​​active noise reduction ability. The technicians of Shijian can obtain the latest active noise reduction design tools and technologies, and provide local support for the development of active noise reduction products with professional knowledge. In order to shorten the time-to-market of end-customer products, Shijian also specially established an audio test laboratory in the Shenzhen office to test various types of active noise reduction equipment. Now, Shijian has formed a complete active noise reduction technology research, development and test platform, with feedforward, feedback and feedforward plus feedback three design schemes, suitable for in-ear type, pressure ear type and over-ear type Headphones can help local audio engineers efficiently. Audio test laboratory established by World Health Chen Jian, Director of Product Marketing Department of World Health Company, said that World Health understands the Chinese market very well and can provide Chinese customers with timely and local solutions. After absorbing the active noise reduction technology and reference design of Austrian Microelectronics, World Health Audio Center also added corresponding innovative added value, which enables World Health to quickly provide design suggestions to customers and help them shorten the time to market and reduce costs. . In the fast-growing market of active noise reduction, the partnership of mutual support and mutual support will enable both companies to obtain greater benefits.
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From left to right: Chen Jian, Director of Product Marketing Department of World Health Company, Rob Damjanovic, Sales Director of Austrian Microelectronics Asia Pacific, Laurence Zhang, General Manager of Austrian Microelectronics China 
Schematic diagram of active noise reduction technology 
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