CN100515120C - Super low noise hearing aid circuit - Google Patents
Super low noise hearing aid circuit Download PDFInfo
- Publication number
- CN100515120C CN100515120C CNB2004100940723A CN200410094072A CN100515120C CN 100515120 C CN100515120 C CN 100515120C CN B2004100940723 A CNB2004100940723 A CN B2004100940723A CN 200410094072 A CN200410094072 A CN 200410094072A CN 100515120 C CN100515120 C CN 100515120C
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Abstract
This invention relates to a hearing-aid circuit capable of controlling noises at the extremely low state including an input part and an output part, characterizing in including a noise suppressing part containing a transistor a diode, capacitors, resistors and adjustable resistors, among which, in said input part, the IC outputs two path signals, one is connected with an amplified rectifying circuit composed of transistors, the other one is connected with small signal noise suppressing circuit composed of diodes.
Description
Technical field
The present invention relates to a kind of hearing aids, particularly relate to a kind of super low noise hearing aid circuit that noise can be controlled at extremely low state.
Background technology
The hearing aids noise is the technical problem that influences the hearing aids inherent quality, and therefore, the technical staff faces the inherent quality that how to improve the hearing aids product; Solve noise problem as early as possible; To improve speech intelligibility and this technical barrier of intelligibility.At present, the hearing aids noise of domestic production generally reaches 30dB, top-quality can reaching more than the 20dB, and the external hearing aids noise of producing also can only reach 16dB.As seen, all face both at home and abroad and solve this technical barrier of hearing aids noise, and the key that will solve this technical problem is: must design noise can be controlled at the hearing aid circuit that extremely hangs down state.
Summary of the invention
For solving the technical problem that above-mentioned prior art exists, the objective of the invention is to: for improving the inherent quality of hearing aids, solve that noise is big, the problem of speech intelligibility and intelligibility difference, the spy provides a kind of super low noise hearing aid circuit that noise can be controlled at extremely low state.
The technical scheme that the present invention is taked for its technical problem of solution is: a kind of super low noise hearing aid circuit, comprise importation and output, it is characterized in that: also comprise noise suppression parts, this noise suppression parts comprises transistor T 1-T3, diode D1-D4, capacitor C 7-C13, resistance R 7-R13 and adjustable resistance VR2, and integrated circuit HK505 output two paths of signals in the described importation: the one tunnel connects the amplification rectification circuit that is made of transistor T 1; One the tunnel connects by diode D1, the small-signal noise reducing circuit that D2 constitutes, output 6 pin of integrated circuit HK505 connect the positive pole of capacitor C 7, the end of the negative pole connecting resistance R7 of capacitor C 7, the base stage of another termination transistor T 1 of resistance R 7, the grounded emitter of transistor T 1, the end of the collector electrode connecting resistance R9 of transistor T 1, the other end of resistance R 9 connects the positive pole of power supply E and an end of resistance R 8 respectively, another termination transistor T 1 base stage of resistance R 8, one termination transistor T1 collector electrode of capacitor C 9, the other end of capacitor C 9 connects the positive pole of diode D3 and the negative pole of diode D4 respectively, the plus earth of diode D4, the negative pole of diode D3 connects the positive pole of capacitor C 10, the minus earth of capacitor C 10, the end of diode D3 negative pole difference connecting resistance R11 and the base stage of transistor T 2, after the base stage of another termination transistor T 3 of resistance R 11, link to each other with an end of resistance R 10 again, the emitter of another termination transistor T 2 of resistance R 10, the collector electrode of transistor T 2 connects the positive pole of power supply E, one termination integrated circuit HK505 output, 6 pin of capacitor C 8, the other end of capacitor C 8 connects the negative pole of diode D1 respectively, the collector electrode of the positive pole of diode D2 and transistor T 3, the positive pole of diode D1 connects the negative pole of diode D2, after connecing the emitter of transistor D3 again, distinguish the end of connecting resistance R12 again, one end of resistance R 13 and the end of capacitor C I1, the resistance R 13 and capacitor C 11 other ends are ground connection respectively, one end of another termination capacitor C 12 of resistance R 12, the other end of capacitor C 12 connects an end of variable resistor VR2 and capacitor C 13 respectively, after the other end of the other end of capacitor C 13 and variable resistor VR2 joins, link to each other with the base stage of transistor T 4 in the output again.
Take the hearing aids of technique scheme, detect through national quality inspection center, its equivalent input noise level can reach 0dB, compare with the hearing aids of prior art, its equivalent input noise level has reduced 20dB～30dB, thereby improved speech intelligibility and intelligibility, solved the big technical barrier of hearing aids noise.This index of noise is to weigh the important symbol of hearing aids quality, and therefore high-quality super low noise hearing aid provided by the invention has certain market prospect at home and abroad.
Description of drawings
Fig. 1 is an electrical schematic diagram of the present invention and as Figure of abstract.
Embodiment
With reference to accompanying drawing, the integrated circuit HK505 output two paths of signals in the importation of the present invention: the one tunnel connects the amplification rectification circuit that is made of transistor T 1; One the tunnel connects the small-signal noise reducing circuit that is made of diode D1D2.The signal of telecommunication of integrated circuit HK505 output is sent into transistor T 1 by capacitor C 7 and is carried out the signal amplification, amplifying signal becomes direct current signal by the rectification circuit of being made up of diode D3D4 and capacitor C 10 with AC signal, direct current signal is sent into transistor T 3 and T2, transistor T 3 and T2 are not in conducting together or by state, make the conducting of small-signal noise reducing circuit or be in the noise suppression state with input signal.Simultaneously, transistor T 2 provides an additional bias current, makes transistor T 3 abundant conductings, and output circuit normally amplifies.When the external world did not have input signal, the amplification rectification circuit that is made of transistor T 1 did not have enough direct current signal output, and transistor T 3 and T2 are in cut-off state, and the noise that input circuit produces is suppressed, and both can't hear the noise of hearing aids background.When there is voice input signal in the external world, the noise suppression circuit conducting, voice signal is normally exported, and the equivalent input noise level of complete machine is reduced significantly.
Claims (1)
1. super low noise hearing aid circuit, comprise importation and output, it is characterized in that: also comprise noise suppression parts, this noise suppression parts comprises transistor T 1-T3, diode D1-D4, capacitor C 7-C13, resistance R 7-R13 and adjustable resistance VR2, and integrated circuit HK505 output two paths of signals in the described importation: the one tunnel connects the amplification rectification circuit that is made of transistor T 1; One the tunnel connects by diode D1, the small-signal noise reducing circuit that D2 constitutes, output 6 pin of integrated circuit HK505 connect the positive pole of capacitor C 7, the end of the negative pole connecting resistance R7 of capacitor C 7, the base stage of another termination transistor T 1 of resistance R 7, the grounded emitter of transistor T 1, the end of the collector electrode connecting resistance R9 of transistor T 1, the other end of resistance R 9 connects the positive pole of power supply E and an end of resistance R 8 respectively, another termination transistor T 1 base stage of resistance R 8, one termination transistor T1 collector electrode of capacitor C 9, the other end of capacitor C 9 connects the positive pole of diode D3 and the negative pole of diode D4 respectively, the plus earth of diode D4, the negative pole of diode D3 connects the positive pole of capacitor C 10, the minus earth of capacitor C 10, the end of the negative pole difference connecting resistance R11 of diode D3 and the base stage of transistor T 2, after the base stage of another termination transistor T 3 of resistance R 11, link to each other with an end of resistance R 10 again, the emitter of another termination transistor T 2 of resistance R 10, the collector electrode of transistor T 2 connects the positive pole of power supply E, one termination integrated circuit HK505 output, 6 pin of capacitor C 8, the other end of capacitor C 8 connects the negative pole of diode D1 respectively, the collector electrode of the positive pole of diode D2 and transistor T 3, the positive pole of diode D1 connects the negative pole of diode D2, after connecing the emitter of transistor D3 again, distinguish the end of connecting resistance R12 again, one end of resistance R 13 and an end of capacitor C 11, the resistance R 13 and capacitor C 11 other ends are ground connection respectively, one end of another termination capacitor C 12 of resistance R 12, the other end of capacitor C 12 connects an end of variable resistor VR2 and capacitor C 13 respectively, after the other end of the other end of capacitor C 13 and variable resistor VR2 joins, link to each other with the base stage of transistor T 4 in the output again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100940723A CN100515120C (en) | 2004-12-29 | 2004-12-29 | Super low noise hearing aid circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100940723A CN100515120C (en) | 2004-12-29 | 2004-12-29 | Super low noise hearing aid circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1649447A CN1649447A (en) | 2005-08-03 |
| CN100515120C true CN100515120C (en) | 2009-07-15 |
Family
ID=34869445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100940723A Expired - Fee Related CN100515120C (en) | 2004-12-29 | 2004-12-29 | Super low noise hearing aid circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100515120C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104980861A (en) * | 2014-04-01 | 2015-10-14 | 天津市助听器厂 | Maximum volume output hearing aid |
| CN104768116A (en) * | 2015-04-08 | 2015-07-08 | 成都爱可信科技有限公司 | Intelligent wearable hearing-aid |
-
2004
- 2004-12-29 CN CNB2004100940723A patent/CN100515120C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1649447A (en) | 2005-08-03 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090715 Termination date: 20131229 |