In the early morning of October 29, Apple released its new generation of TWS headset, airpods Pro wireless headset, which supports active noise reduction. After evaluation of the headset, the noise reduction effect of the semi in ear TWS headset exceeds that of the Bose ear headset! Those who tried it were surprised that although the headset sold for 1999 yuan, users flocked to it, forcing apple to continuously increase production capacity. The headset also led the trend of noise reduction of TWS headphones. How can semi earphones achieve amazing noise reduction? Let's take a look at the noise reduction black technology of AMS, a leading manufacturer in the field of active noise reduction.

In fact, the principle of active noise reduction technology is very simple. We all know that sound is a kind of wave. It has peaks and troughs, which also directly determine the size of sound. According to the theory of physics, interference and superposition will occur when two trains of waves with the same frequency and opposite phase meet. Therefore, as long as we design a similar wave with completely opposite states, we can minimize the intensity and eliminate the noise.

For example, when an object is forced to vibrate upward, another force takes the initiative to press the wave of vibration and keep it in place. This is what active noise reduction technology does, allowing one sound wave to suppress another sound wave. This is the principle of active noise reduction. In addition to headphones, active noise reduction technology is also widely used in the automotive field. Active noise reduction technology is applied to a large number of medium and high-end models.

      Recently,Pierre laboisesams, executive vice president of AMS global sales and marketing department, was interviewed by electronic innovation network and other media and introduced AMS's active noise reduction technology.

      In fact, AMS has been deeply engaged in noise reduction for more than ten years. AMS was the first to provide analog noise reduction. In addition, AMS also provides professional knowledge for headphone manufacturers to help them optimize the acoustic, mechanical and electrical aspects of product design. In 2016, AMS completed the acquisition of incus laboratories, acquired new digital audio technology and entered the field of digital noise reduction.

      PieRRE said that the company has accumulated a lot in the audio field, especially at AppleAirpods Pro wireless headsetBefore publishing, alsoNone for the semi in earNoise reduction scheme of earphone. In June this year, AMSThe company officially launched the active noise reduction chip as3460 for semi in ear earplugs.

   
   

      As3460 is a digital noise reduction scheme.In addition to the enlarged heating engine (ahe) mainly used for noise reduction algorithm operation, the chip also integrates arm cortex-m4f MCU for signal control.Among them, the self-developed DSP in ahe is one of the core competitiveness of AMS. ShouldDSP is completely based on its own IP research and development, and has its unique advantages in doing relevant algorithm processing. This technology comes fromIncus laboratories acquired in earlier years.

      AMS has accumulated over the yearsA large number of digital signal processing noise reduction patents can help manufacturers use DSP for noise reduction. The main method is to use complex filter and related algorithm technology to carry out frequency response and phase in digital signal processingCompensation,Driven by these patented technologies, the scheme has better performance than the traditional analog noise reduction scheme.

      As3460 can also bring automatic preset selection (APS:That is, the automatic preset scene switching) function. Specifically, AMS designs different filters for different scenes and temporarily stores them in the chip.In practical use, APS can automatically pair the best filter for different noise scenes to bring better active noise reduction effect.At the same time, the earphone using this scheme can also calculate the optimal noise reduction parameters in real time and switch smoothly according to the change of transfer function caused by leakage change between human ear and earphone, so as to achieve natural listening feeling and no pop noise.

   
     

      PieRRE reveals the futureAMS will also launch a scheme with better noise reduction effect. In addition, he believes that TWS earphone line will integrate more functions. For example, integration with biological monitoring is also the future trend. AMS has a scheme integrating software and hardware in this regard, but he did not disclose more details.

      According to GfK, by 2020, the global market scale of TWS Bluetooth headset will reach US $11 billion.The latest report of the development industry research institute under trendforce also points out that in 2019 alone, the global shipment of TWS Bluetooth headsets reached 78 million groups, with an annual increase of 52.9%! This data has not been included in a large number of shanzhais of HuaqiangThe shipment of airpods Pro TWS headphones, if included, will be very amazing!Next year, Bluetooth SIG will launch a new Bluetooth standard that really supports TWS headphones. At that time, the field of TWS headphones will usher in a new round of great changes.

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