CN202799097U - Audio input circuit for GPS voice control system - Google Patents
Audio input circuit for GPS voice control system Download PDFInfo
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- CN202799097U CN202799097U CN 201220524310 CN201220524310U CN202799097U CN 202799097 U CN202799097 U CN 202799097U CN 201220524310 CN201220524310 CN 201220524310 CN 201220524310 U CN201220524310 U CN 201220524310U CN 202799097 U CN202799097 U CN 202799097U
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Abstract
The utility model discloses an audio input circuit for a GPS voice control system. The audio input circuit comprises a positive signal input line P and a negative signal input line N. The positive signal input line P and the negative signal input line N are both provided with grounded capacitors. Another capacitor is connected in parallel between the positive signal input line P and the negative signal input line N. The positive signal input line P is further connected with a grounded TVS diode, and the negative signal input line N is connected with another grounded TVS diode in the same way. Output ends of the two diodes are grounded. The audio input circuit for the GPS voice control system is advantaged by characteristics of strong anti-interference capability and good circuit protectiveness.
Description
Technical field
The utility model relates to a kind of voicefrequency circuit, specifically refers to a kind of audio input circuit for the GPS speech control system.
Background technology
GPS, GPS (Global Position System) is namely utilized the GPS position location satellite, the system that positions in real time in the world, navigates.Development along with information technology, GPS has been deep in the daily life, GPS such as kinds such as car borne GPS navigation, cellphone GPS maps emerges in an endless stream, and present GPS is not only of a great variety, and function is also more come also many, an important system as intelligent GPS navigation, the GPS speech control system is more and more known by people and is liked, the GPS speech control system is by user speech GPS to be operated, and need not button, simple and convenient, practicality is very strong.
Because the GPS speech control system mainly is to operate and report information by voice, so the voicefrequency circuit as the GPS speech control system just seems particularly important, voicefrequency circuit has comprised input voicefrequency circuit and output audio circuit, the input and output that the two finishes respectively sound reach the transmitting effect of sound.When using the GPS voice system, a maximum antijamming capability that problem is exactly audio input circuit will be if the poor anti jamming capability of audio input circuit will directly cause voice system the situations such as noise, speech recognition are inaccurate to occur.The utility model has proposed a kind of novel audio input circuit for above problem, so that the enhancing of the anti-interference of audio input circuit, simultaneously also can better protective circuit.
The utility model content
Problem to be solved in the utility model provides a kind of audio input circuit for the GPS speech control system, and audio input circuit easily is disturbed and flimsy problem to be used for solving in the past.
The technical scheme that the utility model provides is: the audio input circuit that is used for the GPS speech control system, comprise plus signal input line P and cut signal input line N, be equipped with the electric capacity of a ground connection on plus signal input line P and the cut signal input line N, also be parallel with an electric capacity between described plus signal input line P and the cut signal input line N, also be connected with the TVS pipe of ground connection on the described plus signal input line P, described cut signal input line N is connected with the TVS pipe of ground connection, the output head grounding of described two diodes equally.Described plus signal input line P and cut signal input line N all adopt differential signal transmission.
Electric capacity in parallel between described plus signal input line P and the cut signal input line N is between the electric capacity of ground connection on plus signal input line P and the cut signal input line N.Electric capacity in parallel can better be eliminated the poor interference of touching between plus signal input line P and the cut signal input line N, and plus signal input line P and cut signal input line N are upper that the electric capacity of ground connection can better be eliminated common mode disturbances, the antijamming capability of whole like this audio input circuit, practicality strengthens greatly.
All electric capacity in the described audio input circuit all adopt the electric capacity of 33pF capacitance.Different appearance values, the electric capacity of material, resonance frequency is different, is used for filtering the interference of characteristic frequency, need to select the electric capacity of suitable resonance frequency.The resonance point of the electric capacity of 33pF can better be eliminated interference signal.
Described TVS pipe adopts unidirectional TVS pipe.The TVS pipe is a kind of high-effect protection device of diode form; when the two poles of the earth of TVS diode are subject to reverse transient state high energy impact events; it can be with the speed of 10-12 second-time; the high impedance of its two interpolar is become Low ESR; the surge power of absorption up to thousands of watts; effectively protect precision components in the electronic circuit to avoid the damage of various pulses, fabulous protection the components and parts on circuit and the circuit.
The utility model has the advantage of: this audio input circuit for the GPS speech control system of the present utility model has the advantages that antijamming capability is strong, circuit protection is good.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Embodiment
Referring to Fig. 1, the audio input circuit that is used for the GPS speech control system, comprise plus signal input line P and cut signal input line N, be equipped with the electric capacity of a ground connection on plus signal input line P and the cut signal input line N, also be parallel with an electric capacity between described plus signal input line P and the cut signal input line N, also be connected with the TVS pipe of ground connection on the described plus signal input line P, described cut signal input line N is connected with the TVS pipe of ground connection, the output head grounding of described two diodes equally.
Electric capacity in parallel between described plus signal input line P and the cut signal input line N is between the electric capacity of ground connection on plus signal input line P and the cut signal input line N.
All electric capacity in the described audio input circuit all adopt the electric capacity of 33pF capacitance.
Described TVS pipe adopts unidirectional TVS pipe.
In use, because the adding of electric capacity so that the antijamming capability of whole circuit strengthens, can not be subject to outer signals and disturb in the process of signal input, can better signal be inputted audio frequency apparatus.
The adding of TVS pipe can not be subject to electrostatic interaction and damages to some extent so that the antistatic effect of whole circuit strengthens, fabulous protection circuit.
Can well realize the utility model as mentioned above.
Claims (4)
1. the audio input circuit that is used for the GPS speech control system, comprise plus signal input line P and cut signal input line N, it is characterized in that: the electric capacity that is equipped with a ground connection on plus signal input line P and the cut signal input line N, also be parallel with an electric capacity between described plus signal input line P and the cut signal input line N, also be connected with the TVS pipe of ground connection on the described plus signal input line P, described cut signal input line N is connected with the TVS pipe of ground connection, the output head grounding of described two diodes equally.
2. the audio input circuit for the GPS speech control system according to claim 1 is characterized in that: electric capacity in parallel between described plus signal input line P and the cut signal input line N is between the electric capacity of ground connection on plus signal input line P and the cut signal input line N.
3. the audio input circuit for the GPS speech control system according to claim 1 is characterized in that: all electric capacity in the described audio input circuit all adopt the electric capacity of 33pF capacitance.
4. the audio input circuit for the GPS speech control system according to claim 1 is characterized in that: the unidirectional TVS pipe of described TVS pipe employing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220524310 CN202799097U (en) | 2012-10-15 | 2012-10-15 | Audio input circuit for GPS voice control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220524310 CN202799097U (en) | 2012-10-15 | 2012-10-15 | Audio input circuit for GPS voice control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202799097U true CN202799097U (en) | 2013-03-13 |
Family
ID=47826263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220524310 Expired - Fee Related CN202799097U (en) | 2012-10-15 | 2012-10-15 | Audio input circuit for GPS voice control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202799097U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103731778A (en) * | 2012-10-15 | 2014-04-16 | 成都众易通科技有限公司 | Audio input circuit used for GPS voice control system |
-
2012
- 2012-10-15 CN CN 201220524310 patent/CN202799097U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103731778A (en) * | 2012-10-15 | 2014-04-16 | 成都众易通科技有限公司 | Audio input circuit used for GPS voice control system |
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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: 20130313 Termination date: 20131015 |