Super low noise hearing aid circuit
A hearing aid and noise technology, applied in hearing aids, transducer circuits, sensors, etc., can solve the problems of poor voice clarity and intelligibility, high noise, etc., to solve technical problems, solve high noise, improve voice clarity and reliability. The effect of intelligibility
Inactive Publication Date: 2009-07-15
天津市助听器厂
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Problems solved by technology
[0003] In order to solve the technical problems in the above-mentioned prior art, the object of the present invention is to provide a hearing aid that can control the noise at an extremely low state of the art ultra-low noise hearing aid circuit
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[0007] Referring to the accompanying drawings, the integrated circuit HK505 in the input part of the present invention outputs two signals: one is connected to the amplifying and rectifying circuit composed of transistor T1; the other is connected to the small signal noise suppression circuit composed of diode D1D2. The electrical signal output by the integrated circuit HK505 is sent to the transistor T1 for signal amplification through the capacitor C7, and the amplified signal is converted into a DC signal through the rectification circuit composed of the diode D3D4 and the capacitor C10, and the DC signal is sent to the transistors T3 and T2, and the transistor T3 And T2 is in the on or off state depending on the input signal, so that the small signal noise suppression circuit is on or in the noise suppression state. At the same time, the transistor T2 provides a supplementary bias current to fully conduct the transistor T3, and the output circuit is normally amplified. Whe...
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The invention relates to a hearing aid, in particular to an ultra-low noise hearing aid circuit capable of controlling the noise to an extremely low state. It includes an input part and an output part, and is characterized in that it also includes a noise suppression part, the noise suppression part includes transistors, diodes, capacitors, resistors and adjustable resistors, and the integrated circuit in the input part outputs two signals: one is connected to An amplification and rectification circuit composed of transistors is connected to a small-signal noise suppression circuit composed of diodes. The ultra-low noise hearing aid adopting the above technical solution can reduce the equivalent input noise level by 20dB to 30dB, thereby solving the problems of loud noise, poor speech clarity and intelligibility of the hearing aid, and greatly improving the intrinsic quality of the hearing aid. Therefore, the high-quality ultra-low noise hearing aid provided by the present invention has a certain market prospect at home and abroad.
Description
technical field [0001] The invention relates to a hearing aid, in particular to an ultra-low noise hearing aid circuit capable of controlling the noise to an extremely low state. Background technique [0002] Hearing aid noise is a technical problem that affects the intrinsic quality of hearing aids. Therefore, technicians are faced with the technical problem of how to improve the intrinsic quality of hearing aid products; solve the noise problem as soon as possible; improve speech clarity and intelligibility. At present, the noise of domestically produced hearing aids generally reaches 30dB, the best quality can reach more than 20dB, and the noise of foreign-produced hearing aids can only reach 16dB. It can be seen that both at home and abroad are facing the technical problem of solving the noise of hearing aids, and the key to solving this technical problem lies in the design of hearing aid circuits that can control the noise to an extremely low state. Contents of the in...
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IPC IPC(8): H04R25/00H04R3/00
Inventor 唐惠德莫庆荣
Owner 天津市助听器厂