Bluetooth headset, voice light, switch, smart voice SMT MEMS microphone

      Shenzhen Shengrui Electronic Technology Co., Ltd. is a large-scale electronic design and development solution provider and electroacoustic device enterprise. It is a high-tech enterprise specializing in the development, design, production and service of Internet of things consumer electronics and medical health products.

     Professional electroacoustic products set R & D, production, sales as one of the manufacturers. The main production of a variety of high-quality speakers (speakers), microphones (microphone). Products are widely used in interphone, mobile phone, LCD TV, Bluetooth headset, Bluetooth speaker, pen, POS, multimedia audio, advertising machine, voice intercom and other electronic consumer products and communication equipment.

    The company has a group of technical and management talents who have been engaged in the electroacoustic industry for more than 10 years, and has created a superb craft and a strong staff team. At the same time, we actively introduce a series of production equipment and precision testing instruments, perfect management system and testing devices, which effectively ensure the product quality, improve production efficiency, and meet your pursuit of perfect quality. Over the years, integrity management, quality first, won a good reputation!

     Since its inception, the company has adhered to the business philosophy of "customer-centered, management based, quality based, technology-based development" and strictly controlled every link of production

There are two methods of noise reduction, active noise reduction and passive noise reduction.

The active noise reduction function is to neutralize the noise by generating the reverse sound wave equal to the external noise through the noise reduction system, so as to achieve the effect of noise reduction. Active noise reduction earphones are equipped with noise reduction circuits to compete with the external noise. Most of them are designed with large volume of headwear. They can block the external noise by using earplug cotton and earphone shell, so as to achieve the first round of sound insulation. At the same time, in order to have enough space to install active noise reduction circuit and power supply.

Passive noise reduction headphones mainly form a closed space by surrounding the ears, or use silicone earplugs and other sound insulation materials to block the external noise. Because the noise is not processed by the noise reduction circuit chip, it can only block the high-frequency noise, and the effect of low-frequency noise reduction is not obvious.

The three noise reduction measures usually used to reduce noise, namely, noise reduction at the source, noise reduction in the process of transmission and noise reduction at the human ear, are passive. In order to eliminate noise actively, people invented the technology of "active noise elimination". Its principle is: all the sounds heard are sound waves, with a certain spectrum composition. If a sound wave can be found, its spectrum is equal to the amplitude of the noise to be eliminated, and its phase is just opposite (180% difference) °）， The superposition of the two can completely cancel out the noise. The key is how to get the sound that cancels out the noise. The practical method is to start with the noise itself, monitor the noise with a microphone, and then try to generate a reverse sound wave through the electronic circuit and play it out through the loudspeaker. From this point of view, the technology of active noise elimination is actually "fighting poison with poison".

When dealing with the complex noise environment, the two MEMS microphones of "active noise reduction" will pick up the inner ear noise and various external environment noise respectively, and are equipped with independent intelligent HD noise reduction processor to carry out high-speed operation on the different noises picked up, so as to eliminate the noise accurately. According to the noise reduction requirements of different scenes, the headset provides a variety of listening modes: strong and weak active noise reduction mode and an ambient sound mode. It can isolate external noise in different degrees and eliminate the "black hole feeling" of common noise reduction earphones.