Shanghai Ning'er Medical Equipment Co., Ltd.

.Reasonable selection of microphone The main function of the microphone is to pick up sound information. When picking up sound, you should try your best to pick up the required sound and avoid losing unnecessary sound. This will not only help to improve the quality of the picked up sound, but also Reduce the occurrence of acoustic feedback. In the hearing aid system, on the premise of meeting the required output sound pressure level, microphones with high sensitivity do not need to adjust the gain too high compared to microphones with low sensitivity, so as to avoid acoustic feedback caused by excessive gain. Directivity refers to the microphone's ability to receive sounds from different angles. From the perspective of suppressing acoustic feedback, the smaller the directional angle, the better. The selection of microphone directivity characteristics must be reasonable, because if the pointing angle is too small, the pickup area will be correspondingly reduced. Therefore, when selecting the microphone directivity, you must consider it comprehensively and do not ignore one thing and lose the other. Peaks in the frequency response characteristic curve of the microphone can also easily cause acoustic feedback.: Shanghai Chongming Oticon Hearing Aid Fitting Center Due to the uneven frequency characteristics of the microphone, the microphone output signal will certainly not be exactly the same at each frequency, causing the output signal to be at certain frequencies. It is too strong, which provides conditions for acoustic feedback. Shanghai Chongming Oticon Hearing Aid Fitting Center should pay attention to the frequency response characteristics of microphones without obvious peaks when selecting microphones.
Bamboo shoots are mainly used to relieve thirst and wind-heat, replenish qi and relieve abdominal distension. They are suitable for Ningyuan when steamed, boiled or stir-fried. Light bamboo shoots smell sweet and cold. It is mainly used for eliminating phlegm, eliminating fever, strengthening fever, headache and wind, and can also be used to treat pregnant women with spinning head, trembling and palpitations, fever and epidemic, nausea and vomiting in children. Winter bamboo shoots and bamboo shoots are sweet and cold. It is mainly used to treat acne and rash in children. Cook porridge and eat it to detoxify and have the meaning of occurrence. Wang Ying. Shi Zhen said, "Zanning Bamboo Shoots" says that although bamboo shoots are sweet, they are slippery in the large intestine and are not beneficial to the spleen. It is commonly known as scraping the intestines. Only ginger and sesame oil can kill the poison. If people use hemp bamboo clumps, they will wither and become sparse the next year. This can be verified. The shoots of clump bamboo, spotted bamboo, flat bamboo, square bamboo, Lingnan bamboo, moon bamboo, etc. are all too painful to eat. Shi Zhen often recommends people to drink bamboo shoot soup to cure acne. I don’t know that acne and sores are not suitable for smoothing the large intestine, and bamboo shoots are known as scraping the intestines, so I don’t know how many people have suffered from it.