一、前言电话用碳粒送话器已有近一百年的历史了。由于碳粒送话器电声换能效率高,加上制造方便、成本低等优点,在当前国内外电话通信中,碳粒送话器仍占有比较重要的地位。因此研究和改进碳粒送话器的性能,有着现实的意义。 First, the introduction of telephone carbon microphone has been nearly a hundred years of history. Due to the high electro-acoustic conversion efficiency of carbon microphone, coupled with the advantages of convenient manufacture and low cost, carbon microphone still occupies an important position in the current domestic and international telephone communications. Therefore, research and improve the performance of carbon microphone, with practical significance.