CN103825853B - Digital audio FM modulation circuit of handheld ultrashort wave air radio - Google Patents
Digital audio FM modulation circuit of handheld ultrashort wave air radio Download PDFInfo
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- CN103825853B CN103825853B CN201310643401.4A CN201310643401A CN103825853B CN 103825853 B CN103825853 B CN 103825853B CN 201310643401 A CN201310643401 A CN 201310643401A CN 103825853 B CN103825853 B CN 103825853B
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Abstract
The invention discloses a digital audio FM modulation circuit of a handheld ultrashort wave air radio. The circuit comprises a level regulator, an A/D converter, a digital audio equalizer, an MCU and a digital frequency modulation unit. The level regulator, the A/D converter, the digital audio equalizer and the digital frequency modulation unit are sequentially connected. The MCU is connected with the digital audio equalizer and the digital frequency modulation unit. The digital frequency modulation unit comprises a CPU processor, an SPI interface, a frequency offset reference value register, a voltage controlled oscillator and a frequency offset base coefficient register. The frequency offset reference value register, the voltage controlled oscillator and the frequency offset base coefficient register are connected with the CPU processor. The frequency offset reference value register is connected with the digital audio equalizer through the SPI interface. The voltage controlled oscillator and the frequency offset base coefficient register are connected with the MCU. The circuit can carry out accurate, fast and smooth frequency modulation processing on an audio signal, and is suitable for the demand of large data voice communication.
Description
Technical field
The present invention relates to Ultra-short Wave Communication Technique field, and in particular to the DAB FM of hand-held ultrashort wave ground to air radio set is adjusted
Circuit processed.
Background technology
Ultrashort wave frequency band hand-held ground to air radio set, typically refers to the hand-held radio station with earthwave or space wave line-of-sight transmission,
It is mainly made up of the part such as transceiver, antenna and power supply.It is mainly used in civil aviaton, railway, public security, flood control, fire prevention etc.
Department's private communication command dispatching system, it is particularly right for the field task and airport emergency guarantee etc. such as dropping from the air, dropping, train
Sky guiding commander's task.
At present, the domestic main ultrashort wave frequency band hand-held ground to air radio set for adopting mainly Japan ICOM ends can admire, the U.S.
Motorola, New Zealand are very lucky, Canadian innovation, and the product of Japanese day essence and Kenwood, these equipment can preferably meet daily
Earth-space communication.
Ultrashort wave radio set is mainly using Modulation and Amplitude Modulation and single sideband modulation.Single sideband radio stations has compared with amplitude modulation radio set
The advantages of saving frequency spectrum, save power, be easy to multiplexing.In fact, the interference free performance of frequency modulation modulation better than amplitude-modulation system and
Single sideband system, but these imported products only support amplitude modulation speech mode of operation, do not support to frequency modulation speech mode of operation.
At present, in signal frequency modulation, adopt carries out multiple mixed modulated filtering to field of radio frequency communication by simulated audio signal
The technical scheme of amplification, the device being related to using this scheme is more, and circuit is complex, there is control underaction, and linking is tired
It is difficult, not enough smooth, degree of regulation is poor, processing speed is slow, it is difficult to adapt to the demand of big data voice communication.
The content of the invention
In order to overcome prior art when ultrashort wave up-link is carried out, using the equipment of import, it only supports AM speeches
Mode of operation, does not support the technological deficiency to FM speech mode of operations, while existing signal frequency modulation is adopted believing analogue audio frequency
The technical scheme of multiple mixed modulated filter and amplification number is carried out, the device being related to using this scheme is more, and circuit is complex, deposits
In control underaction, linking is difficult, not enough smooth, degree of regulation is poor, processing speed is slow, it is difficult to adapt to big data voice communication
Demand technical problem, the present invention provides the DAB FM modulation circuits of hand-held ultrashort wave ground to air radio set.
To solve above-mentioned technical problem, the present invention is employed the following technical solutions：
The DAB FM modulation circuits of hand-held ultrashort wave ground to air radio set, including level adjuster, A/D converter, numeral
Audio equalizer, MCU single-chip microcomputers, frequency-shift keying unit, level adjuster, A/D converter, digital audio equalizer, numeral are adjusted
Frequency unit is sequentially connected with, and MCU single-chip microcomputers are connected with digital audio equalizer, frequency-shift keying unit.Frequency-shift keying unit includes
CPU processor, SPI interface, frequency deviation refer to value register, voltage controlled oscillator, frequency deviation radix coefficient register, and frequency deviation reference value is posted
Storage, voltage controlled oscillator, frequency deviation radix coefficient register are connected with CPU processor, and frequency deviation is connect with reference to value register by SPI
Mouth connection digital audio equalizer, voltage controlled oscillator, frequency deviation radix coefficient register, CPU processor connect with MCU single-chip microcomputers
Connect.
The operation principle of the present invention is that the audio signal of input is amplified, is filtered by level adjuster, reaches A/D and turns
Simulated audio signal is converted into digital audio and video signals by the job requirement of parallel operation, A/D converter, sends DAB to balanced
Device, digital audio equalizer carries out digital audio processing under the control of MCU single-chip microcomputers, draws the frequency deviation ginseng of digital audio and video signals
Value is examined, digital audio and video signals are passed to frequency deviation reference value and posted by digital audio equalizer together with frequency deviation reference value by SPI interface
Storage, MCU single-chip microcomputers calculate average frequency and frequency deviation radix according to the frequency deviation reference value that digital audio equalizer is calculated
Coefficient, passes to average frequency voltage controlled oscillator, frequency deviation radix coefficient is passed to into frequency deviation radix coefficient register, together
When to CPU processor send FM continuous modulation orders, CPU processor call frequency deviation with reference to value register digital audio and video signals and
Frequency deviation reference value, the average frequency of voltage controlled oscillator, the inclined radix coefficient of frequency deviation radix coefficient register are calculated,
Frequency modulation is carried out to digital audio and video signals, the audio signal for having processed is exported.
With prior art when ultrashort wave up-link is carried out, using AM speech mode of operations are only supported, do not support to FM
The technical scheme of speech mode of operation, while existing FM signals frequency modulation is adopted carries out multiple mixed modulated by simulated audio signal
The technical scheme of filter and amplification is compared, and the present invention amplifies audio signal using level adjuster, using mould for A/D converter
Intend audio signal digitizing, digital audio and video signals are processed under the control of MCU single-chip microcomputers using digital audio equalizer and is calculated
Go out frequency deviation reference value, the frequency deviation that frequency deviation reference value passes to frequency-shift keying unit is referred to into value register, calculate in MCU single-chip microcomputers
Go out average frequency and frequency deviation radix coefficient and be transferred to voltage controlled oscillator and the frequency deviation radix system of frequency-shift keying unit respectively
Number register, and FM continuous modulation orders are sent to CPU processor, CPU processor calls each chirp parameter to believe DAB
Number frequency modulation is carried out, frequency modulation is exported to the technical scheme of next unit after terminating, the technical scheme is that total digitalization
Signal frequency modulation scheme, and the tangible difference of analog fm scheme of prior art, technical scheme tool is tangible
Feature, is that prior art is made that contribution, and what the present invention solved that existing analog fm technology is present be related to, and device is more, circuit compared with
For complexity, there is control underaction, be connected difficult, not enough smooth, the technical problem that degree of regulation is poor, processing speed is slow, it
High accuracy, quick, smooth frequency modulation can be carried out to audio signal to process, the present invention is simple to operate, flexible, is adapted to big data language
The demand of sound communication, technical scheme represents WeiLai Technology trend, and it has good industrial applicibility and industry valency
Value.
In order to further optimize, the quality of simulated audio signal is improved, be easy to A/D converter to be sampled, preferably,
The DAB FM modulation circuits of hand-held ultrashort wave ground to air radio set, also including AC/DC combiner, direct-flow signal generator, electricity
Flat adjuster connects AC/DC combiner, AC/DC combiner connection A/D converter, AC/DC combiner also with direct current
Signal generator connects.
It is more than the simulated audio signal disposal ability of the DAB FM modulation circuits to hand-held ultrashort wave ground to air radio set
Further improvement.DC component signal has been superimposed on original simulated audio signal, A/D converter can have preferably been met
Demand, improves the sampling precision of audio signal.
In order to further optimize, it is ensured that the DC component signal of superposition can be effective filtered out, preferably, hand-held ultrashort
The DAB FM modulation circuits of ripple ground to air radio set, also including digital high-pass filter, A/D converter connection Digital High Pass Filter
Device, digital high-pass filter connection digital audio equalizer.
It is more than that the digital signal processing capability of DAB FM modulation circuits to hand-held ultrashort wave ground to air radio set is entered
One step is improved.Direct current signal is effectively filtered out by digital high-pass filter, the mould for obtaining eight signed numbers is quasiprimitive
Audio signal, so as to ensure the pure of audio signal.
In order to further optimize, the analogue audio frequency disposal ability of level adjuster is improved, preferably, hand-held ultrashort wave pair
The DAB FM modulation circuits in empty radio station, level adjuster includes AGC gain controller, wave filter, and AGC gain controller connects
Connect wave filter, wave filter connection AC/DC combiner.
It is more than the simulated audio signal disposal ability of the DAB FM modulation circuits to hand-held ultrashort wave ground to air radio set
Further improvement.Cooperated using AGC gain controller and wave filter, it is possible to achieve be both exaggerated audio signal, protected again
The quality of card audio signal.
In order to further optimize, the DAB FM modulation circuits analogue audio frequency for improving hand-held ultrashort wave ground to air radio set is processed
Ability, preferably, the DAB FM modulation circuits of hand-held ultrashort wave ground to air radio set also include digital regulation resistance, AC/DC
Combiner connects digital regulation resistance, digital regulation resistance connection A/D converter.
It is more than the simulated audio signal disposal ability of the DAB FM modulation circuits to hand-held ultrashort wave ground to air radio set
Further improvement.Digital regulation resistance has that degree of regulation is high, noise is low, reliability is high, working stability the features such as, be especially suitable for
The amplitude modulation of simulated audio signal is processed.
In order to further optimize, it is ensured that the craftmanship of digital regulation resistance, preferably, digital regulation resistance model
AD8400。
It is more than that the job stability of DAB FM modulation circuits to hand-held ultrashort wave ground to air radio set further changes
Enter.The features such as AD8400 has functional reliability height, life-span length, flexible adjustment.
Compared with prior art, the invention has the beneficial effects as follows：
1. with prior art in audio signal frequency modulation, put using simulated audio signal is carried out into multiple mixed modulated filtering
Big technical scheme is compared, and the present invention controls whole digital audio and video signals frequency-modulating process using MCU single-chip microcomputers, and DAB is equal
Weighing apparatus and MCU single-chip microcomputers cooperate and carry out digital audio and video signals pretreatment, using CPU processor according to the instruction of MCU monolithics,
Digital audio and video signals are carried out with frequency modulation(PFM) with reference to the data of pretreatment, what the present invention solved prior art presence is related to device
Many, circuit is complex, there is control underaction, is connected difficult, not enough smooths, the skill that degree of regulation is poor, processing speed is slow
Art problem, it can carry out high accuracy, quick, smooth frequency modulation to audio signal and process, simple to operate, flexible, be adapted to big number
According to the demand of voice communication.
2. the present invention is cooperated and is realized amplification and the filtering process of audio signal using AGC gain controller, wave filter,
Guarantee there is preferable digital audio source, the present invention is using direct-flow signal generator, AC/DC combiner, digital current potential
Device, digital high-pass filter cooperate, and realize the sampling with high precision and high-quality purity of simulated audio signal.
The device that the present invention solves prior art presence is more, and circuit is complex, there is control underaction, and linking is tired
It is difficult, not enough smooth, the technical problem that degree of regulation is poor, processing speed is slow, it audio signal can be carried out high accuracy, quickly,
Smooth carries out frequency modulation process, be adapted to big data voice communication demand it there is good industrial applicibility and industrial value.
Description of the drawings
For the clear explanation present invention, below the present invention and embodiment are explained using accompanying drawing, and accompanying drawing is made
Go out brief description.Accompanying drawing and description of the drawings are schematic, do not constitute the concrete restriction to the present invention.In inventive concept of the present invention
Under guidance, other accompanying drawings can also be obtained by figure below.
Fig. 1 is the structural representation of the present invention.
Specific embodiment
The specific embodiment of the present invention is further illustrated with reference to Figure of description.Saying to these embodiments
It is bright serve mainly to facilitate understand the present invention inventive concept, solved technical problem, constitute technical scheme technical characteristic and
The technique effect for bringing.Explanation to these embodiments is schematic, does not constitute the concrete restriction to the present invention.The present invention
Technical characteristic involved by each embodiment, as long as do not constitute conflict each other just can be mutually combined, by equivalent substitute or
Person is all embodiments that obvious variant is obtained, and embodiments of the invention are substantially the same.
Embodiment one：
As shown in figure 1, it is of the invention, including level adjuster, A/D converter, digital audio equalizer, MCU single-chip microcomputers, number
Word frequency modulation unit, level adjuster, A/D converter, digital audio equalizer, frequency-shift keying unit are sequentially connected with, MCU single-chip microcomputers
It is connected with digital audio equalizer, frequency-shift keying unit.Frequency-shift keying unit includes CPU processor, SPI interface, frequency deviation ginseng
Value register, voltage controlled oscillator, frequency deviation radix coefficient register are examined, frequency deviation refers to value register, voltage controlled oscillator, frequency deviation radix
Coefficient register is connected with CPU processor, and frequency deviation connects digital audio equalizer, pressure with reference to value register by SPI interface
Controlled oscillator, frequency deviation radix coefficient register, CPU processor are connected with MCU single-chip microcomputers.
When the present invention comes into operation, the first step, inspection, commissioning device：Check level adjuster, A/D converter, digital sound
Whether frequency equalization device, MCU single-chip microcomputers, frequency-shift keying unit are connected by technical scheme, the hardware connection between them
It is whether normal, if there is exception, corrected；Check CPU processor, SPI interface, frequency deviation with reference to value register, voltage-controlled shake
Swing whether device, frequency deviation radix coefficient register are connected by technical scheme, whether the hardware connection between them is normal,
If there is exception, corrected；Second step, plus electric test equipment,：Startup power supply, confirms hand-held ultrashort wave ground to air radio set
Whether DAB FM modulation circuits working condition normal, it is normal after just come into operation；3rd step, by hand-held ultrashort wave to empty electricity
The DAB FM modulation circuits of platform are arranged to ultrashort wave hand-held ground to air radio set, carry out FM frequency modulation tasks.
Those skilled in the art can be according to practice of construction environment and the parameter of the requirement unrestricted choice component of workpiece.
Embodiment two：
In order to improve the simulated audio signal disposal ability of the DAB FM modulation circuits of hand-held ultrashort wave ground to air radio set,
The present embodiment is further improved on the basis of embodiment one, as shown in figure 1, the hand-held ultrashort wave ground to air radio set of the present embodiment
DAB FM modulation circuits, also including AC/DC combiner, direct-flow signal generator, level adjuster connection exchange is straight
Stream combiner, AC/DC combiner connection A/D converter, AC/DC combiner is also connected with direct-flow signal generator.
Embodiment three：
In order to improve the digital signal processing capability of the DAB FM modulation circuits of hand-held ultrashort wave ground to air radio set, this reality
Apply example further to improve on the basis of embodiment two, as shown in figure 1, the number of the hand-held ultrashort wave ground to air radio set of the present embodiment
Word tone frequency FM modulation circuits, also including digital high-pass filter, A/D converter connection digital high-pass filter, digital high-pass filter
Ripple device connects digital audio equalizer.
Example IV：
In order to improve the simulated audio signal disposal ability of the DAB FM modulation circuits of hand-held ultrashort wave ground to air radio set,
The present embodiment is further improved on the basis of any one embodiment of embodiment one～tri-, as shown in figure 1, the present embodiment
Level adjuster include AGC gain controller, wave filter, AGC gain controller connection wave filter, wave filter connection exchange are straight
Stream combiner.
Embodiment five：
In order to improve the simulated audio signal disposal ability of the DAB FM modulation circuits of hand-held ultrashort wave ground to air radio set,
The present embodiment is further improved on the basis of any one embodiment of embodiment one～tetra-, as shown in figure 1, the present embodiment
Hand-held ultrashort wave ground to air radio set DAB FM modulation circuits also include digital regulation resistance, AC/DC combiner connection number
Word potentiometer, digital regulation resistance connection A/D converter.
Embodiment six：
In order to improve the job stability of the DAB FM modulation circuits of hand-held ultrashort wave ground to air radio set, the present embodiment exists
Further improve on the basis of embodiment five, as shown in figure 1, digital regulation resistance model AD8400 of the present embodiment.
Embodiments of the present invention are explained in detail above in association with Figure of description, but the present invention be not limited to it is above-mentioned
Embodiment and embodiment, on the basis of the inventive concept based on the present invention, are carried out respectively to the above-mentioned embodiment of the present invention
Plant change, modification, replace or modification, each fall within protection scope of the present invention.
Claims (6)
1. the DAB FM modulation circuits of hand-held ultrashort wave ground to air radio set, including level adjuster, A/D converter, digital sound
Frequency equalization device, MCU single-chip microcomputers, frequency-shift keying unit, the level adjuster, A/D converter, digital audio equalizer, numeral
Frequency modulation unit is sequentially connected with, and the MCU single-chip microcomputers are connected with digital audio equalizer, frequency-shift keying unit；
Characterized in that, the frequency-shift keying unit include CPU processor, SPI interface, frequency deviation with reference to value register, voltage-controlled shake
Device, frequency deviation radix coefficient register are swung, the frequency deviation is equal with reference to value register, voltage controlled oscillator, frequency deviation radix coefficient register
Be connected with CPU processor, the frequency deviation with reference to value register by SPI interface connection digital audio equalizer, it is described voltage-controlled to shake
Swing device, frequency deviation radix coefficient register, CPU processor to be connected with MCU single-chip microcomputers.
2. DAB FM modulation circuits of hand-held ultrashort wave ground to air radio set according to claim 1, it is characterised in that also
Including AC/DC combiner, direct-flow signal generator, level adjuster connection AC/DC combiner, AC/DC combiner
Connection A/D converter, the AC/DC combiner is also connected with direct-flow signal generator.
3. DAB FM modulation circuits of hand-held ultrashort wave ground to air radio set according to claim 2, it is characterised in that also
Including digital high-pass filter, A/D converter connection digital high-pass filter, the digital high-pass filter connects DAB
Balanced device.
4. DAB FM modulation circuits of hand-held ultrashort wave ground to air radio set according to claim 2, it is characterised in that institute
Level adjuster is stated including AGC gain controller, wave filter, the AGC gain controller connection wave filter, the wave filter connect
Connect AC/DC combiner.
5. DAB FM modulation circuits of hand-held ultrashort wave ground to air radio set according to claim 2, it is characterised in that also
Including digital regulation resistance, AC/DC combiner connection digital regulation resistance, digital regulation resistance connection A/D converter.
6. DAB FM modulation circuits of hand-held ultrashort wave ground to air radio set according to claim 5, it is characterised in that institute
State digital regulation resistance model AD8400.
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| CN201310643401.4A CN103825853B (en) | 2013-12-05 | 2013-12-05 | Digital audio FM modulation circuit of handheld ultrashort wave air radio |
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| CN201310643401.4A CN103825853B (en) | 2013-12-05 | 2013-12-05 | Digital audio FM modulation circuit of handheld ultrashort wave air radio |
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| CN103825853B true CN103825853B (en) | 2017-04-12 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101232480A (en) * | 2006-10-05 | 2008-07-30 | 马维尔国际贸易有限公司 | Method and device for regulating frequency offset |
| WO2010059872A2 (en) * | 2008-11-19 | 2010-05-27 | Qualcomm Incorporated | Fm transmitter and non-fm receiver integrated on single chip |
| CN203243357U (en) * | 2013-05-15 | 2013-10-16 | 西安烽火电子科技有限责任公司 | Signal processing system using short-wave adaptive frequency selection |
| CN203313177U (en) * | 2013-07-05 | 2013-11-27 | 成都天奥信息科技有限公司 | Ultrashort-wave dual-band handheld air station |
-
2013
- 2013-12-05 CN CN201310643401.4A patent/CN103825853B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101232480A (en) * | 2006-10-05 | 2008-07-30 | 马维尔国际贸易有限公司 | Method and device for regulating frequency offset |
| WO2010059872A2 (en) * | 2008-11-19 | 2010-05-27 | Qualcomm Incorporated | Fm transmitter and non-fm receiver integrated on single chip |
| CN203243357U (en) * | 2013-05-15 | 2013-10-16 | 西安烽火电子科技有限责任公司 | Signal processing system using short-wave adaptive frequency selection |
| CN203313177U (en) * | 2013-07-05 | 2013-11-27 | 成都天奥信息科技有限公司 | Ultrashort-wave dual-band handheld air station |
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