CN2538110Y - Hand-free earphone device for preventing electromagnetic wave interference - Google Patents
Hand-free earphone device for preventing electromagnetic wave interference Download PDFInfo
- Publication number
- CN2538110Y CN2538110Y CN 02226568 CN02226568U CN2538110Y CN 2538110 Y CN2538110 Y CN 2538110Y CN 02226568 CN02226568 CN 02226568 CN 02226568 U CN02226568 U CN 02226568U CN 2538110 Y CN2538110 Y CN 2538110Y
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- China
- Prior art keywords
- signal input
- input apparatus
- mobile phone
- circuit
- electromagnetic wave
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- Expired - Fee Related
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Abstract
A hand-free headset device with electromagnetic interference resistant function is provided, which comprises a signal input device which can receive voice-frequency signals sent by a cell phone, an amplifying and acoustic quality processing circuit which is able to amplify and process voice-frequency signals received by the signal input device, a hand-free headset for voice output and a constant voltage circuit for the power supply of the whole circuit. The utility model is characterized in that: a wave filter device which can filter the electromagnetic waves produced by the cell phone is positioned between the signal input device and the amplifying and acoustic quality processing circuit. By adopting the structure of arranging the filter device behind the signal input device, the utility model reliably eliminates interference of the high-frequency electromagnetic wave produced by the cell phone and received by the signal input device, thereby improving the speech quality of the hand-free handset efficiently; the wave filter device positioned between a volume control circuit and the circuit of amplifying and acoustic quality processing is capable of entirely eliminating the interference of radiative electromagnetic from the cell phone, thereby further enhancing the speech quality of the utility model.
Description
Technical field
The utility model relates to the communications field, particularly relates to a kind of mobile communication receiving apparatus Handless.
Background technology
When in the process of driving a car, using mobile phone to carry out the mobile communication answer, generally all to use Handless, guarantee that on the one hand both hands can hold steering wheel running car is handled reliably, also can significantly reduce the injury of mobile phone electromagnetic wave to human brain on the other hand, the Handless of this structure comprises that the microphone that can receive audio signal that mobile phone sends, can be to the Handless of the audio signal that pickup microphone received is amplified and tonequality is handled amplification and tonequality treatment circuit, output sound.Its basic functional principle is: when carrying out the communication answer with mobile phone, pickup microphone is obtained the audio signal of mobile phone loudspeaker and this audio signal is amplified and handles the back with tonequality and intactly the other side's message and voice are expressed by Handless is clear, thereby avoided handheld mobile phone and pressed close to the problem that ear is listened to, but because mobile phone itself is exactly a small-sized signal transmitter/receiver, when connecting information, it can generate electromagnetic waves, after pickup microphone or other circuit receive this electromagnetic wave and amplify through amplifying, can become an ear-piercing interfering noise, have a strong impact on the speech quality of this Handless.
Summary of the invention
The purpose of this utility model is the problem at above-mentioned existence, provides a kind of and can effectively avoid Electromagnetic Interference, handfree receiver unit that speech quality is high.
The technical solution of the utility model is achieved in that
The handfree receiver unit that a kind of anti electromagnetic wave disturbs, comprise the signal input apparatus that can receive audio signal that mobile phone sends, one can to signal input apparatus institute received audio signal amplify with the Handless of the amplification of handling and tonequality treatment circuit, output sound, for entire circuit provides the voltage stabilizing circuit of power supply, it is characterized in that being provided with between signal input apparatus and amplification and the tonequality treatment circuit filter that the electromagnetic wave by the mobile phone generation that signal input apparatus received can be carried out Filtering Processing.
Wherein above-mentioned filter comprises the capacitor C that is arranged between signal input apparatus two signal output parts
4And inductance L
1The pi type filter of forming, wherein capacitor C
4Be connected in parallel between two signal output parts of signal input apparatus inductance L
1Be connected between the signal output part and amplifier and tonequality treatment circuit of signal input apparatus.
For further improving the utility model anti-electromagnetic wave interference capability, above-mentioned filter also includes inductance L
2, inductance L wherein
2With above-mentioned inductance L
1Form the double wrap inductor, and inductance L
2Be connected between another signal output part and ground of signal input apparatus.
For effectively avoiding tone frequency channel wire of the present utility model or volume control circuit to receive of the interference of the radiated electromagnetic wave of mobile phone generation to Handless, also be provided with volume control circuit between above-mentioned amplification and tonequality treatment circuit and the signal input apparatus, and also be provided with the auxiliary filter that the electromagnetic wave of being come by mobile phone radiation can be carried out Filtering Processing between this volume control circuit and amplification and the tonequality treatment circuit.
The utility model is owing to adopt the structure that filter is set behind signal input apparatus, the high-frequency electromagnetic wave interference that the mobile phone that can reliably signal input apparatus be received produces is removed, and effectively improves the speech quality of Handless.The Electromagnetic Interference that the filter that is provided with on the signal input apparatus ground wire simultaneously can further receive signal input apparatus is removed for a full due.And the filter that is provided with between volume control circuit and amplification and tonequality treatment circuit can be removed the electromagnetic radiation wave interference that mobile phone produces fully, thereby further improve conversation output of the present utility model, and the utility model is simple in structure, it is easy, practical to make.
Describe basic structure of the present utility model and operation principle in detail below in conjunction with accompanying drawing:
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment I;
Fig. 2 is the electric functional-block diagram of Fig. 1;
Fig. 3 is the electric principle schematic of Fig. 1;
Fig. 4 is the electric principle schematic of the utility model embodiment II;
Fig. 5 is the electric principle schematic of the utility model embodiment III.
Embodiment
As shown in Figure 1-Figure 3, the utility model comprise the signal input apparatus that can receive audio signal that mobile phone sends, one can to signal input apparatus institute received audio signal amplify with the Handless 2 of the amplification of handling and tonequality treatment circuit, output sound, for entire circuit provides the voltage stabilizing circuit of power supply, wherein be provided with a filter that the electromagnetic wave by the mobile phone generation that signal input apparatus received can be carried out Filtering Processing between signal input apparatus and amplification and the tonequality treatment circuit.Wherein said filter comprises by the capacitor C that is arranged between signal input apparatus two signal output parts
4And inductance L
1The pi type filter of forming, wherein capacitor C
4Be connected in parallel between two signal output parts of signal input apparatus inductance L
1Be connected between the signal output part and amplification and tonequality treatment circuit of signal input apparatus.For further improving the utility model anti-electromagnetic wave interference capability, above-mentioned filter also includes inductance L
2, inductance L wherein
2With above-mentioned inductance L
1Form the double wrap inductor, and inductance L
2Be connected between another signal output part and ground of signal input apparatus.For effectively avoiding tone frequency channel wire of the present utility model or volume control circuit to receive of the interference of the radiated electromagnetic wave of mobile phone generation to Handless, also be provided with volume control circuit between above-mentioned amplification and tonequality treatment circuit and the signal input apparatus, and also be provided with the auxiliary filter that the electromagnetic wave of being come by mobile phone radiation can be carried out Filtering Processing between this volume control circuit and amplification and the tonequality treatment circuit.Should comprise by the capacitor C that is arranged between volume control circuit output and the ground by auxiliary filter
6And be connected on inductance L between volume control circuit and amplification and the tonequality treatment circuit
3The pi type filter of forming.The scope of application of the present utility model is quite wide, but it can be that as shown in Figure 1 above-mentioned signal input apparatus is clamping mobile phone and can receive the pickup microphone 1 that the mobile phone loudspeaker are sounded with being connected of mobile phone.Also can be that as shown in Figure 4 above-mentioned signal input apparatus is for being plugged on the plug that also can receive audio signal that mobile phone sends in the hands-free socket in mobile phone bottom.Also can be that as shown in Figure 5 above-mentioned signal input apparatus is for being plugged in the earphone socket of mobile phone and receiving the plug of audio signal that mobile phone sends.Structures such as amplification of the present utility model simultaneously and tonequality treatment circuit, voltage stabilizing circuit, Handless 2 are prior art, diversified implementation is arranged, those of ordinary skill in the art just can obtain this quite ripe realization circuit without creative work, be not described in detail in this its various concrete structures and implementation, the integrated circuit (IC) of amplification of this enforcement sound intermediate frequency and tonequality treatment circuit
1Adopt TBA820M, the transistor Q of voltage stabilizing circuit
1Adopt 8050.
Claims (8)
1, a kind of handfree receiver unit of anti electromagnetic wave interference, comprise the signal input apparatus that can receive audio signal that mobile phone sends, one can to signal input apparatus institute received audio signal amplify with the Handless (2) of the amplification of handling and tonequality treatment circuit, output sound, for entire circuit provides the voltage stabilizing circuit of power supply, it is characterized in that being provided with between signal input apparatus and amplification and the tonequality treatment circuit filter that the electromagnetic wave by the mobile phone generation that signal input apparatus received can be carried out Filtering Processing.
2, the handfree receiver unit of anti electromagnetic wave interference according to claim 1 is characterized in that above-mentioned filter comprises by the capacitor C that is arranged between signal input apparatus two inputs
4And inductance L
1The pi type filter of forming, wherein capacitor C
4Be connected in parallel between two signal output parts of signal input apparatus inductance L
1Be connected between the signal output part and amplification and tonequality treatment circuit of signal input apparatus.
3, the handfree receiver unit of anti electromagnetic wave interference according to claim 2 is characterized in that above-mentioned filter also includes inductance L
2, inductance L wherein
2With above-mentioned inductance L
1Form the double wrap inductor, and inductance L
2Be connected between another signal output part and ground of signal input apparatus.
4, the handfree receiver unit that disturbs according to claim 1 or 2 or 3 described anti electromagnetic waves, it is characterized in that also being provided with volume control circuit between above-mentioned amplification and tonequality treatment circuit and the signal input apparatus, and also be provided with the auxiliary filter that the electromagnetic wave of being come by mobile phone radiation can be carried out Filtering Processing between this volume control circuit and amplification and the tonequality treatment circuit.
5, the handfree receiver unit of anti electromagnetic wave interference according to claim 4 is characterized in that above-mentioned auxiliary filter comprises by the capacitor C that is arranged between volume control circuit output and the ground
6And be connected on inductance L between volume control circuit and amplification and the tonequality treatment circuit
3The pi type filter of forming.
6, the handfree receiver unit that disturbs according to claim 1 or 2 or 3 described anti electromagnetic waves, but it is characterized in that above-mentioned signal input apparatus is for the clamping mobile phone and can receive the pickup microphone (1) that the mobile phone loudspeaker are sounded.
7, the handfree receiver unit that disturbs according to claim 1 or 2 or 3 described anti electromagnetic waves is characterized in that above-mentioned signal input apparatus is for being plugged on the plug that also can receive audio signal that mobile phone sends in the hands-free socket in mobile phone bottom.
8, the handfree receiver unit that disturbs according to claim 1 or 2 or 3 described anti electromagnetic waves is characterized in that above-mentioned signal input apparatus is in the earphone socket that can be plugged on mobile phone and receive the plug of audio signal that mobile phone sends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02226568 CN2538110Y (en) | 2002-04-02 | 2002-04-02 | Hand-free earphone device for preventing electromagnetic wave interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02226568 CN2538110Y (en) | 2002-04-02 | 2002-04-02 | Hand-free earphone device for preventing electromagnetic wave interference |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2538110Y true CN2538110Y (en) | 2003-02-26 |
Family
ID=33703541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02226568 Expired - Fee Related CN2538110Y (en) | 2002-04-02 | 2002-04-02 | Hand-free earphone device for preventing electromagnetic wave interference |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2538110Y (en) |
-
2002
- 2002-04-02 CN CN 02226568 patent/CN2538110Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |