HEARING AID USED BOTH FOR SOUND TRANSMISSION HARD HEARING AND NERVE SENSITIVE HARD HEARING, ESPECIALLY HAVING CONDENSERS FOR IMPEDANCE CORRECTION

摘要

PURPOSE: A hearing aid used for sound transmission hard hearing and nerve sensitive hard hearing is provided to perform linear amplification and nonlinear amplification of sound according to the control of a user. CONSTITUTION: The hearing aid comprises a mic(10) converting a voice signal into an electrical signal, and an amplification part(20) amplifying the electrical signal, and a speaker(30) outputting the amplified electrical signal as a voice signal. A low pass filter part(40) is connected between the mic and the amplification part, and is constituted with a condenser(C1) and a variable resistor(VR1), and filters a low frequency signal. A high pass filter(50) is connected between the amplification part and the speaker, and is constituted with a condenser(C4) and a variable resistor(VR2), and filters a high frequency signal. And a volume control(70) has a variable resistor(VR3) to control the amplitude of the amplified signal.