CN201708793U - Vehicular wireless frequency modulation interphone circuit - Google Patents
Vehicular wireless frequency modulation interphone circuit Download PDFInfo
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- CN201708793U CN201708793U CN201020251003XU CN201020251003U CN201708793U CN 201708793 U CN201708793 U CN 201708793U CN 201020251003X U CN201020251003X U CN 201020251003XU CN 201020251003 U CN201020251003 U CN 201020251003U CN 201708793 U CN201708793 U CN 201708793U
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Abstract
The utility model relates to a wireless radio frequency circuit, in particular to an electronic circuit for a vehicular wireless frequency modulation interphone, which comprises a transmitting circuit and a receiving circuit. For the transmitting circuit, voice signals inputted via a microphone is transmitted to a baseband processor chip for processing after being subjected to AGC, then the signals are subjected to amplification and amplitude limiting at a microphone amplifier circuit, and after frequency deviation control of a D/A converter, the signals enter a VCO unit for direct frequency modulation and then are transmitted out through an antenna. For the receiving circuit, signals inputted via the antenna passes through a transmit-receive switching circuit and a band pass filter and are subjected to radio frequency amplification, then enter an intermediate frequency processor chip after being subjected to band pass filtering, frequency mixing and crystal filtering, and are subjected to secondary frequency mixing and ceramic filtering prior to amplification and frequency discrimination to generate an audio signal H and a signaling coded signal, which are subjected to corresponding treatment. The vehicular wireless frequency modulation interphone circuit has the advantages of various common vehicular interphones, and has certain unique functions and circuits.
Description
Technical field
The utility model relates to wireless radio frequency circuit, relates in particular to the electronic circuit that is used for vehicle-mounted wireless frequency modulation intercom.
Background technology
Vehicle-mounted intercom is widely used in the urban transportation system, especially is widely used in making things convenient for getting in touch of taxi and control tower greatly in the command dispatching system of taxi.Existing vehicle-mounted intercom function is simple, and the speech talkback function only is provided, and intelligence and diversity inadequately on the function can not satisfy the autgmentability demand of practical application.
The utility model content
Therefore, the utility model proposes a kind of have high-power output, good transmitting-receiving performance and the onboard wireless frequency modulation intercom circuit of power.It has some unique function and circuit in addition except the characteristics with many common vehicle-mounted intercoms.
The utility model adopts following technical scheme:
Onboard wireless frequency modulation intercom circuit of the present utility model comprises the circuit of radiating portion and the circuit of receiving unit.Wherein:
The circuit of radiating portion is to deliver to the baseband processing chip processing after the voice signal of microphone input passes through the Gain Automatic controller of AGC, amplify amplitude limit on words discharge road then, control through the D/A converter frequency deviation, pass through then by the part more than the low pass filter filters out signal intermediate frequency rate 3kHz, enter the VCO unit from the MOD of VCO unit modulation terminal again and carry out direct frequency modulated, and the CTCSS that the CPU control unit produces, DTCSS, 2TONE, the dtmf signaling coding mixes at the SUM synthesizer with the voice signal that above-mentioned words discharge road is sent sends into the VCO cells modulate, then described VCO unit and phase locked-loop unit produce the radio-frequency carrier signal of emission, amplify through buffering, excitation is amplified, power model, produce specified radio-frequency power, through duplexer and low pass filter, suppress harmonic components, launch by antenna then;
The circuit of receiving unit is to carry out radio frequency to amplify behind the signal process transmitting-receiving change-over circuit of antenna input and band pass filter, after passing through another band-pass filter again, enter first frequency mixer, in first frequency mixer, will from the amplifying signal of radio frequency with from the first local oscillation signal mixing of phase locked-loop unit and generate first intermediate-freuqncy signal, first intermediate-freuqncy signal is further eliminated the noise signal of neighboring trace by crystal filter, filtered first intermediate-freuqncy signal enters the intermediate frequency process chip, with second local oscillation signal that obtains through benchmark crystal resonator 3 frequencys multiplication once more mixing generate second intermediate-freuqncy signal, after second intermediate-freuqncy signal is passed through two useless spurious signals of ceramic filter filtering, be exaggerated and frequency discrimination, produce audio signal H and signalling coding signal, audio signal is handled by described baseband processing chip, entering volume control circuit and audio-frequency power amplifier amplifies, drive loud speaker, and CTCSS, DTCSS, the 2TONE signalling coding is through low pass filter, dtmf signal is by sending into above-mentioned CPU control unit decoding identification after the decoding, the part of audio signal is carried out the detection rectification by filter and amplifier to its noise component(s), produce one and the corresponding direct voltage of noise component(s), and the analog port of delivering to above-mentioned CPU control unit and the magnitude of voltage that sets in advance size relatively, open or close output according to comparative result by the electronic switch control loudspeaker that connects.
Further, described baseband processing chip is the CMX138 chip.
Further, described D/A converter is the M62363FP chip.
Further, described CPU control unit comprises reset circuit, memory, LCD driver module, keyboard drive module and the power supply high voltage protective module that is connected on the microcontroller chip.
Further, described crystal filter is the crystal filter of 46.35MHZ.
Further, described intermediate frequency process chip is the NJM2591 chip.
Onboard wireless frequency modulation intercom circuit of the present utility model has high-power output, good transmitting-receiving performance and power, and it has some unique function and circuit in addition except the characteristics with many common vehicle-mounted intercoms.For example: have 200 memory channels and CALL channel; Memory channel grouping management function; There is multiple easy-to-use, high efficiency scanning pattern to select; Has the CTCSS/DCS/2-Tone signaling; Support computer write frequently, from platform programming, wired duplicating; Can use be set with frequency, alien frequencies, scramble; Frequency interval can be selected (wide, arrowband switches); Has ANI identification code function; Has DTMF dual-tone multifrequency codec functions; Have supply voltage and exceed the allowed band automatic shutoff protective functions.Onboard wireless frequency modulation intercom circuit of the present utility model can be formed simple and easy transfer, can satisfy the normal use of intercom transfer communication substantially, and installation is simpler, and cost is cheaper.And built-in scramble voice encryption, voice encryption mode user can oneself definition, makes the intercommunication secret more of conversing, and can carry out the noise suppression companding, separate companding speech, makes speech quality pure more quiet.The utility model also demonstrates fully human oriented design, and it is more convenient, warm that the user is used, as the full dot matrix large scale display of user interface, and screen backlight lamp color tunable, double frequency point on duty, double frequency point simultaneously shows simultaneously.
Description of drawings
Fig. 1 is a circuit block diagram of the present utility model.
Embodiment
Now with embodiment the utility model is further specified in conjunction with the accompanying drawings.
Consult shown in Figure 1ly, comprise the circuit of radiating portion and the circuit of receiving unit.Wherein:
The circuit of radiating portion is to deliver to 102 processing of CMX138 baseband processing chip after the voice signal of microphone input passes through the Gain Automatic controller 101 of AGC, this IC can carry out scrambling, descrambling to speech, the voice companding, separate companding, preemphasis, processing such as postemphasis, amplify amplitude limit on words discharge road then, through the D/A converter 103 frequency deviations control of M62363FP, finish instantaneous frequency deviation control to input signal.Pass through then by the part more than the low pass filter filters out signal intermediate frequency rate 3kHz, enter VCO (voltage controlled oscillator) unit 104 from the MOD of VCO unit 104 modulation terminal again and carry out direct frequency modulated, and the CTCSS that CPU control unit 105 produces, DTCSS, 2TONE, the dtmf signaling coding mixes at SUM synthesizer 106 with the voice signal that above-mentioned words discharge road is sent sends into 104 modulation of VCO unit, then described VCO unit 104 and phase locked-loop unit 107 produce the radio-frequency carrier signal of emission, amplify through buffering, excitation is amplified, power model, produce specified radio-frequency power, through duplexer and low pass filter, suppress harmonic components, launch by antenna then.
The circuit of receiving unit adopts the double superheterodyne mode, the signal of antenna input carries out the radio frequency amplification after receiving and dispatching change-over circuit and band pass filter, after passing through another band pass filter 108 filtering again, enter first frequency mixer 109, in first frequency mixer 109, will from the amplifying signal of radio frequency with from the first local oscillation signal mixing of phase locked-loop unit 107 and generate first intermediate-freuqncy signal, first intermediate-freuqncy signal is further eliminated the noise signal of neighboring trace by the crystal filter 110 of 46.35MHZ, filtered first intermediate-freuqncy signal enters the intermediate frequency process chip 111 of NJM2591, with 45.9MHZ second local oscillation signal that obtains through benchmark crystal resonator 112 frequency triplings once more mixing generate second intermediate-freuqncy signal, after second intermediate-freuqncy signal is passed through two useless spurious signals of ceramic filter filtering, be exaggerated and frequency discrimination, produce audio signal H and signalling coding signal, audio signal is handled by the baseband processing chip 102 of described CMX138, entering volume control circuit and audio-frequency power amplifier amplifies, drive loud speaker, and CTCSS, DTCSS, the 2TONE signalling coding is through low pass filter, dtmf signal is by sending into the 105 decoding identifications of above-mentioned CPU control unit after the decoding, the part of audio signal is carried out the detection rectification by filter and amplifier to its noise component(s), produce one and the corresponding direct voltage of noise component(s), and the analog port of delivering to above-mentioned CPU control unit 105 and the magnitude of voltage that sets in advance size relatively, open or close output according to comparative result by electronic switch 113 control loudspeakers that connect.
Above-mentioned CPU control unit 105 comprises reset circuit (1052), memory 1053, LCD driver module 1054, keyboard drive module 1055 and the power supply high voltage protective module 1056 that is connected on the microcontroller chip 1051.
Although specifically show and introduced the utility model in conjunction with preferred embodiment; but the those skilled in the art should be understood that; in the spirit and scope of the present utility model that do not break away from appended claims and limited; can make various variations to the utility model in the form and details, be protection range of the present utility model.
Claims (6)
1. onboard wireless frequency modulation intercom circuit comprises the circuit of radiating portion and the circuit of receiving unit, it is characterized in that:
The circuit of radiating portion is to deliver to baseband processing chip (102) processing after the voice signal of microphone input passes through the Gain Automatic controller of AGC (101), amplify amplitude limit on words discharge road then, control through D/A converter (103) frequency deviation, pass through then by the part more than the low pass filter filters out signal intermediate frequency rate 3kHz, enter VCO unit (104) from the MOD of VCO unit (104) modulation terminal again and carry out direct frequency modulated, and the CTCSS that CPU control unit (105) produces, DTCSS, 2TONE, the dtmf signaling coding mixes at SUM synthesizer (106) with the voice signal that above-mentioned words discharge road is sent sends into VCO unit (104) modulation, then described VCO unit (104) and phase locked-loop unit (107) produce the radio-frequency carrier signal of emission, amplify through buffering, excitation is amplified, power model, produce specified radio-frequency power, through duplexer and low pass filter, suppress harmonic components, launch by antenna then;
The circuit of receiving unit is to carry out radio frequency to amplify behind the signal process transmitting-receiving change-over circuit of antenna input and band pass filter, after passing through another band pass filter (108) filtering again, enter first frequency mixer (109), in first frequency mixer (109), will from the amplifying signal of radio frequency with from the first local oscillation signal mixing of phase locked-loop unit (107) and generate first intermediate-freuqncy signal, first intermediate-freuqncy signal is further eliminated the noise signal of neighboring trace by crystal filter (110), filtered first intermediate-freuqncy signal enters intermediate frequency process chip (111), with second local oscillation signal that obtains through benchmark crystal resonator (112) 3 frequencys multiplication once more mixing generate second intermediate-freuqncy signal, after second intermediate-freuqncy signal is passed through two useless spurious signals of ceramic filter filtering, be exaggerated and frequency discrimination, produce audio signal H and signalling coding signal, audio signal is handled by described baseband processing chip (102), entering volume control circuit and audio-frequency power amplifier amplifies, drive loud speaker, and CTCSS, DTCSS, the 2TONE signalling coding is through low pass filter, dtmf signal is by sending into above-mentioned CPU control unit (105) decoding identification after the decoding, the part of audio signal is carried out the detection rectification by filter and amplifier to its noise component(s), produce one and the corresponding direct voltage of noise component(s), and the analog port of delivering to above-mentioned CPU control unit (105) and the magnitude of voltage that sets in advance size relatively, open or close output according to electronic switch (113) control loudspeaker of comparative result by connection.
2. onboard wireless frequency modulation intercom circuit according to claim 1, it is characterized in that: described baseband processing chip (102) is the CMX138 chip.
3. onboard wireless frequency modulation intercom circuit according to claim 1, it is characterized in that: described D/A converter (103) is the M62363FP chip.
4. onboard wireless frequency modulation intercom circuit according to claim 1 is characterized in that: described CPU control unit (105) comprises reset circuit (1052), memory (1053), LCD driver module (1054), keyboard drive module (1055) and the power supply high voltage protective module (1056) that is connected on the microcontroller chip (1051).
5. onboard wireless frequency modulation intercom circuit according to claim 1, it is characterized in that: described crystal filter (110) is the crystal filter of 46.35MHZ.
6. onboard wireless frequency modulation intercom circuit according to claim 1, it is characterized in that: described intermediate frequency process chip (111) is the NJM2591 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020251003XU CN201708793U (en) | 2010-07-01 | 2010-07-01 | Vehicular wireless frequency modulation interphone circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020251003XU CN201708793U (en) | 2010-07-01 | 2010-07-01 | Vehicular wireless frequency modulation interphone circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201708793U true CN201708793U (en) | 2011-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020251003XU Expired - Fee Related CN201708793U (en) | 2010-07-01 | 2010-07-01 | Vehicular wireless frequency modulation interphone circuit |
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| CN (1) | CN201708793U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103227659A (en) * | 2013-03-04 | 2013-07-31 | 福建省万华电子科技有限公司 | Digital DPMR (digital private mobile radio) interphone based on single-point modulation of digital frequency synthesizer |
| CN107294554A (en) * | 2017-07-28 | 2017-10-24 | 泉州市琪祥电子科技有限公司 | A kind of single-frequency Vehicular intercom |
| CN109474298A (en) * | 2018-12-28 | 2019-03-15 | 深圳市华联讯电子有限公司 | Wireless interspeaker radio circuit and frequency calibration system and method based on the circuit |
-
2010
- 2010-07-01 CN CN201020251003XU patent/CN201708793U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103227659A (en) * | 2013-03-04 | 2013-07-31 | 福建省万华电子科技有限公司 | Digital DPMR (digital private mobile radio) interphone based on single-point modulation of digital frequency synthesizer |
| CN107294554A (en) * | 2017-07-28 | 2017-10-24 | 泉州市琪祥电子科技有限公司 | A kind of single-frequency Vehicular intercom |
| CN107294554B (en) * | 2017-07-28 | 2023-09-12 | 泉州市琪祥电子科技有限公司 | Single-frequency vehicle-mounted interphone |
| CN109474298A (en) * | 2018-12-28 | 2019-03-15 | 深圳市华联讯电子有限公司 | Wireless interspeaker radio circuit and frequency calibration system and method based on the 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: 20110112 Termination date: 20130701 |