CN201854398U - Wireless earphone for foreign language listening teaching - Google Patents
Wireless earphone for foreign language listening teaching Download PDFInfo
- Publication number
- CN201854398U CN201854398U CN2010206214232U CN201020621423U CN201854398U CN 201854398 U CN201854398 U CN 201854398U CN 2010206214232 U CN2010206214232 U CN 2010206214232U CN 201020621423 U CN201020621423 U CN 201020621423U CN 201854398 U CN201854398 U CN 201854398U
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- CN
- China
- Prior art keywords
- audio
- foreign language
- passive filter
- circuit
- wireless earphone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a novel wireless earphone for foreign language listening teaching. The wireless earphone comprises a power source, a magnetic receiving antenna, an audio-frequency pre-amplifying circuit, a passive filter circuit, an audio-frequency power amplifying circuit and a loudspeaker, wherein an output terminal of the audio-frequency pre-amplifying circuit is connected with an input terminal of the passive filter circuit, and an output terminal of the passive filter circuit is connected with the audio-frequency power amplifying circuit. The wireless earphone disclosed by the utility model has the advantages of reasonable structural design, low cost, large capacity and high operation stability, and is more suitable for being used for foreign language teaching.
Description
Technical field
The utility model relates to device therefor field in the foreign language teaching, especially a kind of novel foreign language teaching hearing wireless headset.
Background technology
At present, a large amount of hearing wireless headsets that use in foreign language teaching, because the magnetic reception antenna is subjected to the interference of mixed and disorderly unwanted signal on every side, reception is relatively poor.Before the patent No. being arranged also is the technical literature that the 200420000898.4 use active filter circuits of being announced are eliminated interference signal, but since at present big in the world capacity silicon valve technology that is that all right is ripe, make active filter price height, capacity is little, current common active power filtering capacity is no more than 600kvar, and its operational reliability is lower.
The utility model content
The utility model technical assignment is at above-mentioned technical deficiency, and a kind of novel foreign language teaching hearing wireless headset is provided.
The technical scheme that the utility model technical solution problem is adopted is: comprise power supply, magnetic reception antenna, audio frequency pre-amplification circuit, passive filter circuit, audio power amplifying circuit and loud speaker, the output of this audio frequency pre-amplification circuit links to each other with the input of passive filter circuit, and the output of passive filter circuit links to each other with audio power amplifying circuit.
The beneficial effect that the utility model can bring is:
1, the passive filter circuit cost is cheap, and capacity is big, the operation stability height.
Description of drawings
Fig. 1, the utility model overall structure schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the utility model is done following detailed description:
As shown in Figure 1, the novel foreign language teaching hearing wireless headset that the utility model is announced, comprise power supply, magnetic reception antenna, audio frequency pre-amplification circuit, passive filter circuit, audio power amplifying circuit and loud speaker, the output of this audio frequency pre-amplification circuit links to each other with the input of passive filter circuit, and the output of passive filter circuit links to each other with audio power amplifying circuit.
During concrete the use, the field signal that changes around described magnetic reception antenna receives produces the correspondent voltage signal and amplifies through the audio frequency pre-amplification circuit, power supply signal after the amplification enters filter circuit for no reason at all, useless interference signal major part is filtered out by this passive filter circuit, have only the effective frequency signal to be output, be reduced into sound by loud speaker again to audio power amplifying circuit.Wherein power supply is used to audio power amplifying circuit and the power supply of audio frequency pre-amplification circuit.
In sum, the utility model reasonable in design, with low cost, capacity is big, the operation stability height, it is used to be more suitable for foreign language teaching.
Claims (1)
1. novel foreign language teaching hearing wireless headset, it is characterized in that: comprise power supply, magnetic reception antenna, audio frequency pre-amplification circuit, passive filter circuit, audio power amplifying circuit and loud speaker, the output of this audio frequency pre-amplification circuit links to each other with the input of passive filter circuit, and the output of passive filter circuit links to each other with audio power amplifying circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206214232U CN201854398U (en) | 2010-11-24 | 2010-11-24 | Wireless earphone for foreign language listening teaching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206214232U CN201854398U (en) | 2010-11-24 | 2010-11-24 | Wireless earphone for foreign language listening teaching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201854398U true CN201854398U (en) | 2011-06-01 |
Family
ID=44096776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206214232U Expired - Fee Related CN201854398U (en) | 2010-11-24 | 2010-11-24 | Wireless earphone for foreign language listening teaching |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201854398U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104639077A (en) * | 2014-12-05 | 2015-05-20 | 魅族科技（中国）有限公司 | Passive filtering and amplifying circuit |
-
2010
- 2010-11-24 CN CN2010206214232U patent/CN201854398U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104639077A (en) * | 2014-12-05 | 2015-05-20 | 魅族科技（中国）有限公司 | Passive filtering and amplifying circuit |
| CN104639077B (en) * | 2014-12-05 | 2017-11-07 | 魅族科技（中国）有限公司 | A kind of passive filtering amplifying circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20110601 Termination date: 20111124 |