CN204810263U - DMR digit intercom - Google Patents
DMR digit intercom Download PDFInfo
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- CN204810263U CN204810263U CN201520313694.4U CN201520313694U CN204810263U CN 204810263 U CN204810263 U CN 204810263U CN 201520313694 U CN201520313694 U CN 201520313694U CN 204810263 U CN204810263 U CN 204810263U
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Abstract
The utility model discloses a DMR digit intercom, including the CPU who interconnects, NULL and baseband chip, NULL and first order amplifier circuit, the secondary amplification circuit, promote the pipe, the power tube, antenna switch, public passage and antenna are in proper order, power controller and CPU, promote the pipe, the power tube is connected, baseband chip and the height way of discharging, frequency selective network, antenna switch connects gradually, the baseband chip still with the audio frequency treater, audio power amplifier, loudspeaker connect gradually, circuit connection is still put with the height to NULL, the baseband chip still is connected with first order amplifier circuit, the microphone is connected with NULL, audio power amplifier still is connected with CPU, the utility model discloses an up -to -date style NULL preparation DMR digit intercom, practiced thrift the cost, improved the competitiveness in market.
Description
Technical field
The utility model relates to wireless communication technique field, especially relates to a kind of DMR digital handset adopting integrated chip.
Background technology
At present, the intercom market of China remains analog intercom and occupies an leading position.But there is many shortcomings with not enough in analog-interphone: one, what analog-interphone transmitted is analog signal, and signal processing mode is simple, and consumed power is larger, effectively can not eliminate the impact of interference and noise, under causing many situations, speech quality can not be satisfactory; Its two, the frequency efficiency of analog-interphone is not high, and channel capacity is low; Its three, analog-interphone confidentiality is poor, is easily ravesdropping.
China Patent No.: 200510032685.9 patent document discloses a kind of 400MHz common frequency range digital intercom, comprise voice transmitting-receiving circuit, radio-frequency (RF) transmit-receive circuit, control circuit, power circuit, digital speech processing module, described digital speech processing module is connected with control circuit, voice transmitting-receiving circuit, power circuit, and is connected with radio-frequency (RF) transmit-receive circuit by analog to digital conversion circuit respectively.Aforementioned digital intercom is utilized to realize the method for communication; digital speech processing module is mainly utilized to carry out digital processing to baseband analog voice signal; generation digital baseband transmits, then is supplied to radio-frequency (RF) transmit-receive circuit through digital-to-analogue conversion generation output modulated-analog signal; And analog-to-digital conversion is carried out to demodulated baseband signal, produce digital baseband received signal, audio digital signals is obtained to its process, then becomes Analog Baseband voice signal through digital-to-analogue conversion, be supplied to loud speaker.
The advantage of this invention be there is strong interference immunity, speech quality is good, the availability of frequency spectrum is high, low in energy consumption, degree of integration is high, function upgrading expansion easily.But this intercom yet has certain defect, and Frequency Band Selection is more single, be only suitable for the common frequency band of 400M, different needs can not be met.Transmitting power is large not, and the dry ratio of letter of Signal reception is relatively little; Under special circumstances when operator runs into accident, called party can not determine its position, and then effectively can not help it.
Utility model content
The utility model discloses DMR digital handset, to solve the deficiency of existing analog-interphone and digital handset.
In order to reach above-mentioned object, the utility model adopts following concrete technical scheme:
DMR digital handset, it is characterized in that, comprise CPU, integrated chip, microphone, first order amplifying circuit, second level amplifying circuit, promote pipe, power tube, power controller, duplexer, public passage, antenna, frequency-selective network, High Amplifier Circuit, baseband chip, audio process, audio frequency power amplifier and loudspeaker, described CPU, integrated chip and baseband chip are connected to each other, described integrated chip and first order amplifying circuit, second level amplifying circuit, promote pipe, power tube, duplexer, public passage is connected successively with antenna, described power controller and CPU, promote pipe, power tube connects, baseband chip and High Amplifier Circuit, frequency-selective network, duplexer connects successively, described baseband chip also with audio process, audio frequency power amplifier, loudspeaker connect successively, described integrated chip is also connected with High Amplifier Circuit, described baseband chip is also connected with first order amplifying circuit, described microphone is connected with integrated chip, described audio frequency power amplifier is also connected with CPU, wherein:
(1) high-frequency signal produced by integrated chip, carry out after digitlization through baseband chip, again by first order amplifying circuit and second level amplifying circuit, be sent to promote to manage and again amplify, finally deliver to power tube and carry out power amplification, power after amplification again through duplexer, then is sent into public passage and is shot out to antenna.
(2) next high-frequency signal is received through public passage by antenna, send into High Amplifier Circuit by duplexer and frequency-selective network again to amplify, when signal is analog signal, signal is fed in integrated chip and demodulates audio signal, when signal is digital signal, then signal is sent into baseband chip and demodulate audio signal.
Further, described baseband chip is C5000.
Further, described integrated chip is 4813 cake cores.
The utility model advantage is compared with prior art: high-frequency signal, carries out after digitlization through baseband chip, through three grades of amplifications, ensure that effective high transmitting range; Integrated chip demodulated analog signal, baseband chip demodulated digital signal, has expanded the function of intercom.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present utility model;
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Embodiment
In order to explain the technical solution of the utility model further, below by specific embodiment, the utility model is elaborated.
Embodiment 1:
As shown in Figure 1, DMR digital handset, is characterized in that, comprises CPU1, integrated chip 2, microphone 17, first order amplifying circuit 4, second level amplifying circuit 5, promote pipe 6, power tube 7, power controller 16, duplexer 10, public passage 11, antenna 12, frequency-selective network 9, High Amplifier Circuit 8, baseband chip 3, audio process 15, audio frequency power amplifier 14 and loudspeaker 13, described baseband chip 3 is preferably C5000 type, and described integrated chip 2 is preferably 4813 types, described CPU1, integrated chip 2 and baseband chip 3 are connected to each other, described integrated chip 2 and first order amplifying circuit 4, second level amplifying circuit 5, promote pipe 6, power tube 7, duplexer 10, public passage 11 is connected successively with antenna 12, described power controller 16 and CPU1, promote pipe 6, power tube 7 connects, baseband chip 3 and High Amplifier Circuit 8, frequency-selective network 9, duplexer 10 connects successively, described baseband chip 3 also with audio process 15, audio frequency power amplifier 14, loudspeaker 13 connect successively, and described integrated chip 2 is also connected with High Amplifier Circuit 8, and described baseband chip 3 is also connected with first order amplifying circuit 4, and described microphone 17 is connected with integrated chip 2, and described audio frequency power amplifier 14 is also connected with CPU1.
During use, to go forward side by side the words that work when we press start button, CPU1 can control the signal of 4813 generation one simulation, and carry the voice messaging of microphone 17 reception, 4813 can signal madulation be delivered to inside C5000 simultaneously, by C5000, analog signal is become digital signal, export from C5000 digit chip after signal becomes digital signal, by first order amplifying circuit 4, second level amplifying circuit 5, promotion pipe 6, power tube 7, signal is launched successively.
When antenna 12 receives high-frequency signal time, by public passage 11, the signal received is carried out frequency-selective filtering, signal is delivered to C5000 demodulation being put back to road 8 by height.The audio frequency received in signal reads out through audio process 15, audio frequency power amplifier 14, loudspeaker 13 by signal after demodulation more successively.
Above, be only the embodiment utilizing this origination techniques content, the modification that any those skilled in the art use this creation to do, change, all belong to the scope of the claims that this creation is advocated, and be not limited to those disclosed embodiments.
Claims (3)
1.DMR digital handset, it is characterized in that, comprise CPU, integrated chip, microphone, first order amplifying circuit, second level amplifying circuit, promote pipe, power tube, power controller, duplexer, public passage, antenna, frequency-selective network, High Amplifier Circuit, baseband chip, audio process, audio frequency power amplifier and loudspeaker, described CPU, integrated chip and baseband chip are connected to each other, described integrated chip and first order amplifying circuit, second level amplifying circuit, promote pipe, power tube, duplexer, public passage is connected successively with antenna, described power controller and CPU, promote pipe, power tube connects, baseband chip and High Amplifier Circuit, frequency-selective network, duplexer connects successively, described baseband chip also with audio process, audio frequency power amplifier, loudspeaker connect successively, described integrated chip is also connected with High Amplifier Circuit, described baseband chip is also connected with first order amplifying circuit, described microphone is connected with integrated chip, described audio frequency power amplifier is also connected with CPU, wherein:
(1) high-frequency signal produced by integrated chip; carry out after digitlization through baseband chip; again by first order amplifying circuit and second level amplifying circuit; be sent to promote to manage and again amplify; finally deliver to power tube and carry out power amplification; power after amplification again through duplexer, then is sent into public passage and is shot out to antenna;
(2) next high-frequency signal is received through public passage by antenna, send into High Amplifier Circuit by duplexer and frequency-selective network again to amplify, when signal is analog signal, signal is fed in integrated chip and demodulates audio signal, when signal is digital signal, then signal is sent into baseband chip and demodulate audio signal.
2. DMR digital handset as claimed in claim 1, it is characterized in that, described baseband chip is C5000.
3. DMR digital handset as claimed in claim 1, it is characterized in that, described integrated chip is 4813 cake cores.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520313694.4U CN204810263U (en) | 2015-05-15 | 2015-05-15 | DMR digit intercom |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520313694.4U CN204810263U (en) | 2015-05-15 | 2015-05-15 | DMR digit intercom |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204810263U true CN204810263U (en) | 2015-11-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520313694.4U Expired - Fee Related CN204810263U (en) | 2015-05-15 | 2015-05-15 | DMR digit intercom |
Country Status (1)
| Country | Link |
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| CN (1) | CN204810263U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107733452A (en) * | 2017-11-20 | 2018-02-23 | 泉州市琪祥电子科技有限公司 | A kind of double frequency DMR hand transceivers |
-
2015
- 2015-05-15 CN CN201520313694.4U patent/CN204810263U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107733452A (en) * | 2017-11-20 | 2018-02-23 | 泉州市琪祥电子科技有限公司 | A kind of double frequency DMR hand transceivers |
| CN107733452B (en) * | 2017-11-20 | 2020-01-03 | 泉州市琪祥电子科技有限公司 | Dual-frequency DMR handheld interphone |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151125 Termination date: 20200515 |