Hearing aid
专利汇可以提供Hearing aid专利检索，专利查询，专利分析的服务。并且PURPOSE:To obtain a regeneration signal free from distortion by giving the compression, amplification and regeneration to the input signal in an optional sound pressure dynamic range which is easiest to hear. CONSTITUTION:The signal supplied to microphone 24 is amplified 25, and the gain receives control attenuation 27 to be delivered to earphone 31 via volume 28, main amplifier 29 and output amplifier 30 each. The gain control signal is generated by obtaining the output of amplifier 25. At signal circuit 26, the sensitivity of the control signal is decided by trimmer 33, and the offset is determined by trimmer 34 to rectify 36 the output of amplifier 35. The charging time of the output of 35 is decided by the time constant of resistance 37 and capacity 38, and the discharging time is decided by the time constant of resistance 39 and capacity 38 respectively. The control signal thus produced is supplied to the gate of FET41, and the voltage division ratio is varied by resistance 40 to give compression to the sound pressure. At the same time, the threshold voltage of FET41 is compensated by trimmer 34, and the input level is decided for start of the sound pressure compression. And the compression volume is decided by trimmer 35 to the same input level change. Thus the optimum output is obtained with no distortion.，下面是Hearing aid专利的具体信息内容。
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