| 摘要 |
PURPOSE: A system of transmitting and receiving a sound for hearing aid is provided to improve user convenience by freely controlling sound volume amplification according to the hearing of a user and the volume of surrounding sound. CONSTITUTION: A radio receiver includes a microphone(501) receiving external noise, an amplifier(503), a band-pass filter(505), a mixer(507), a volume control part(509), a power amplifier(511), an output jack(515), and an auto gain control part(513). The radio receiver further includes a volume button which can control a sound volume of the volume control part. The radio receiver includes a control part(523) which controls the on/off of the overall power of the radio receiver by sensing an event of a power switch(521). The control part can display a charge state of a rechargeable battery(519) on an outer LED lamp through a power control part(529). |
