CN104426556A - Dual-mode voice demodulation equipment - Google Patents
Dual-mode voice demodulation equipment Download PDFInfo
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- CN104426556A CN104426556A CN201310410346.4A CN201310410346A CN104426556A CN 104426556 A CN104426556 A CN 104426556A CN 201310410346 A CN201310410346 A CN 201310410346A CN 104426556 A CN104426556 A CN 104426556A
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Abstract
The invention discloses dual-mode voice demodulation equipment. An antenna unit inputs a received radio signal of 88-138MHz into a superheterodyne double-conversion receiving unit; conversion processing is performed on the radio signal by the superheterodyne double-conversion receiving unit under the control of a control unit, so that the radio signal is divided into two paths; one path is demodulated to acquire an FM audio signal by virtue of an FM demodulation unit; the other path is demodulated to acquire an AM audio signal by virtue of an AM demodulation unit; and an audio output unit selectively outputs the FM audio signal or the AM audio signal under control of the control unit. According to the dual-mode voice demodulation equipment disclosed by the invention, a voice signal at a certain frequency point in the range from 88MHz to 138MHz can be simultaneously subjected to FM voice demodulation and AM voice demodulation, so that direct decision basis and parameters are provided for interference analysis between frequency modulation broadcasting and very high frequency ground-to-air communication, and the interference analysis efficiency is greatly improved.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate to a kind of double mode voice demodulated equipment.
Background technology
Along with the development of FM broadcasting business and Commercial Air Service, the interference to the very high frequency(VHF) earth-space communication of civil aviaton's navigation and 118 ~ 138MHz of the FM broadcasting of 88 ~ 108MHz is increasingly serious, in the region had, even severe jamming has arrived the safe operation of civil aviaton, day by day increases the equipment of interference detection, analysis and method demand.Owing to broadcasting as FM modulation, very high frequency(VHF) earth-space communication is AM modulation, if the demodulation of FM and AM voice can be carried out at a certain frequency simultaneously, by analyzing demodulation voice quality out, just can provide interference analysis and directly adjudicate data and parameter, thus improve the efficiency of interference analysis greatly.Existing voice demodulated equipment or frequency, demodulation frequency is limited in scope, cannot cover the frequency range of 88 ~ 138MHz, or function singleness, cannot carry out FM and AM demodulation to speech modulating signal simultaneously.
Summary of the invention
The technical problem to be solved in the present invention is, provides a kind of double mode voice demodulated equipment, within the scope of wider demodulation, carries out FM and AM demodulation to speech modulating signal simultaneously.
The technical solution used in the present invention is, described double mode voice demodulated equipment, comprising:
Antenna element, superhet double conversion receiving element, FM demodulating unit, AM demodulating unit, audio selection output unit and control unit, wherein,
The radio signal of the 88 ~ 138MHz received is inputted superhet double conversion receiving element by antenna element, superhet double conversion receiving element is divided into two-way after carrying out frequency-conversion processing to described radio signal under the control of the control unit, one tunnel obtains FM audio signal through the demodulation of FM demodulating unit, another road obtains AM audio signal through the demodulation of AM demodulating unit, and audio output unit is selected to export FM audio signal or AM audio signal under the control of the control unit.
Further, superhet double conversion receiving element comprises: the first mixing unit, the first local oscillator unit, the second mixing unit and the second local oscillator unit, wherein,
First local oscillator unit produces the first local oscillation signal with fixing stepping under the control of the control unit and is input to the first mixing unit within the scope of setpoint frequency, the radio signal of 88 ~ 138MHz and the first local oscillation signal are carried out mixing by the first mixing unit, produce the first intermediate-freuqncy signal, be input to the second mixing unit;
The second local oscillation signal that second local oscillator unit produces fixed numbers is input to the second mixing unit, and the first intermediate-freuqncy signal and the second local oscillation signal are carried out mixing by the second mixing unit, produce the second intermediate-freuqncy signal.
Further, superhet double conversion receiving element also comprises: pre-filtering amplifying unit and intermediate frequency amplification filtering unit, wherein,
Pre-filtering amplifying unit, is connected between antenna element and the first mixing unit, carries out filtering and amplification to the radio signal of 88 ~ 138MHz that antenna element receives;
Intermediate frequency amplification filtering unit comprises: the first intermediate frequency amplifier, the first filter and the second intermediate frequency amplifier, wherein, first intermediate frequency amplifier and the first filter are connected in turn between the first mixing unit and the second mixing unit, the first intermediate-freuqncy signal that first mixing unit exports is amplified and filtering, is input to the second mixing unit; Second intermediate frequency amplifying unit is connected to the output of the second mixing unit, amplifies the second intermediate-freuqncy signal that the second mixing unit exports.
Further, in the first local oscillator unit, numerical control phase-locked loop, loop filter, operational amplifier are connected successively with voltage controlled oscillator, driving amplifier feeds back to numerical control phase-locked loop after the output of voltage controlled oscillator being amplified, numerical control phase-locked loop simultaneously reception control unit control signal and under the control of this control signal, carry out work.
Further, in the second local oscillator unit, oscillator coordinates external crystal to produce the second local oscillation signal.
Further, in loop filter, the output of numerical control phase-locked loop is connected to one end of the first resistance, and the other end of the first resistance is successively by the second resistance and the first capacity earth, and the other end of described first resistance is also connected to operational amplifier as the output of loop filter.
Further, in FM demodulating unit, the output signal of FM broadband filter is input to the first multiplier after limiting amplifier process, the output signal of limiting amplifier obtains corresponding orthogonal signalling after the process of orthogonal phase shift coil simultaneously, also be input to the first multiplier, the output signal of limiting amplifier is multiplied with described orthogonal signalling and obtains FM audio signal by the first multiplier.
Further, in AM demodulating unit, the output signal of AM narrow band filter is input to the second multiplier and synchronous pll simultaneously, synchronous pll produces carrier signal based on the output signal of AM narrow band filter, and described carrier signal is multiplied with the output signal of AM narrow band filter and obtains AM audio signal by the second multiplier.
Further, audio output unit comprises: diverter switch and audio frequency power amplifier, diverter switch is selected to export FM audio signal or AM audio signal under the control of the control unit, and audio frequency power amplifier then carries out power amplification to the output FM audio signal exported or AM audio signal.
Further, control unit comprises PC and single-chip microcomputer, and wherein, single-chip microcomputer sends control signal to the first local oscillator unit and audio output unit under the control of PC.
Adopt technique scheme, the present invention at least has following advantages:
Double mode voice demodulated equipment of the present invention, the voice demodulation of FM and AM can be carried out to the voice signal of frequency a certain within the scope of 88 ~ 138MHz simultaneously, thus the interference analysis between frequency-modulation broadcasting and very high frequency(VHF) earth-space communication provides and directly adjudicates data and parameter, improve the efficiency of interference analysis greatly.Local oscillator stepping when carrying out mixing to FM modulation signal and AM modulation signal is minimum can reach 2.5kHz, can provide comparatively meticulous frequency-domain demodulation resolution.
Accompanying drawing explanation
Fig. 1 is the composition structural representation of the double mode voice demodulated equipment of the embodiment of the present invention;
Fig. 2 is the detailed composition structural representation of the double mode voice demodulated equipment of the embodiment of the present invention;
Fig. 3 is the circuit connection diagram of the loop filter of the embodiment of the present invention.
Embodiment
For further setting forth the present invention for the technological means reaching predetermined object and take and effect, below in conjunction with accompanying drawing and preferred embodiment, the present invention is described in detail as after.
The double mode voice demodulated equipment of one of the embodiment of the present invention, as shown in Figure 1, following part is comprised: antenna element 100, superhet double conversion receiving element 200, FM demodulating unit 300, AM demodulating unit 400, audio selection output unit 500 and control unit 600.
The radio signal of the 88 ~ 138MHz received is inputted superhet double conversion receiving element 200 by antenna element 100, superhet double conversion receiving element 200 is divided into two-way carry out frequency-conversion processing to this radio signal under the control of control unit 600 after, one tunnel obtains FM audio signal through FM demodulating unit 300 demodulation, another road obtains AM audio signal through AM demodulating unit 400 demodulation, and audio output unit 500 is selected to export FM audio signal or AM audio signal under the control of control unit 600.
Fig. 2 is the detailed composition structural representation of double mode voice demodulated equipment, and as shown in Figure 2, antenna element can adopt antenna ANT to receive control wireless signal.Superhet double conversion receiving element 200 comprises: the first mixing unit, the first local oscillator unit, the second mixing unit and the second local oscillator unit.First mixing unit can adopt the first frequency mixer MIX1, and the second mixing unit can adopt the second frequency mixer MIX2.
In the first local oscillator unit, numerical control phase-locked loop RF_PLL, loop filter LOOP FILTER, operational amplifier OP1 are connected successively with voltage controlled oscillator VCO, driving amplifier RF_AMP feeds back to numerical control phase-locked loop RF_PLL after the output of voltage controlled oscillator VCO being amplified, numerical control phase-locked loop RF_PLL simultaneously reception control unit 600 control signal and under the control of this control signal, carry out work.Because the embodiment of the present invention adopts digitized phase-locked loop control circuit, the local oscillator stepping provided when carrying out mixing to FM modulation signal and AM modulation signal is minimum can reach 2.5kHz, can provide comparatively meticulous frequency-domain demodulation resolution.
First local oscillator unit produces the first local oscillation signal with fixing stepping and is input to the first frequency mixer MIX1 under the control of control unit 600 within the scope of setpoint frequency, the radio signal of 88 ~ 138MHz and the first local oscillation signal are carried out mixing by the first mixing unit, produce the first intermediate-freuqncy signal, be input to the second frequency mixer MIX2.Usually, the first intermediate-freuqncy signal can select 10.7MHz or 10.8MHz.
In the second local oscillator unit, oscillator OSC coordinates external crystal to produce the second local oscillation signal of fixed numbers.Second local oscillation signal is input to the second frequency mixer MIX2 by the second local oscillator unit, and the first intermediate-freuqncy signal and the second local oscillation signal are carried out mixing by the second frequency mixer MIX2, produce the second intermediate-freuqncy signal.Usually, the second intermediate-freuqncy signal can select 455KHz or 555KHz.When the second intermediate-freuqncy signal is 455KHz, the external crystal frequency producing the second local oscillation signal is 10.245M.
Fig. 3 is the circuit connection diagram of loop filter.As shown in Figure 3, loop filter is made up of discrete device, in loop filter, the output of numerical control phase-locked loop RF_PLL is connected to one end of the first resistance R1, the other end of the first resistance R1 is successively by the second resistance R2 and electric capacity C ground connection, and the other end of the first resistance R1 is also connected to operational amplifier OP1 as the output of loop filter.
As shown in Figure 2, superhet double conversion receiving element 200 also comprises: pre-filtering amplifying unit and intermediate frequency amplification filtering unit, wherein,
Pre-filtering amplifying unit comprises radio-frequency filter RF_FILTERH and low noise amplifier LNA, is connected between antenna element 100 and the first frequency mixer MIX1, carries out filtering and amplification respectively to the radio signal of 88 ~ 138MHz that antenna ANT receives.
Intermediate frequency amplification filtering unit comprises: the first intermediate frequency amplifier IF1_AMP, the first filter IF1_FILTER and the second intermediate frequency amplifier IF2_AMP, wherein, first intermediate frequency amplifier IF1_AMP and the first filter IF1_FILTER is connected in turn between the first frequency mixer MIX1 and the second frequency mixer MIX2, the first intermediate-freuqncy signal that first frequency mixer MIX1 exports is amplified and filtering, is input to the second frequency mixer MIX2; Second intermediate frequency amplifying unit is connected to the output of the second frequency mixer MIX2, amplifies the second intermediate-freuqncy signal that the second frequency mixer MIX2 exports.
In FM demodulating unit 300, the output signal of FM broadband filter IF2_FILTER455K BB is input to the first multiplier MUX after limiting amplifier LIMITER_AMP process, the output signal of limiting amplifier LIMITER_AMP obtains corresponding orthogonal signalling after orthogonal phase shift coil QUAD_COIL process simultaneously, also the first multiplier MUX is input to, the output signal of limiting amplifier LIMITER_AMP is multiplied with described orthogonal signalling and obtains FM audio signal by the first multiplier MUX, preferably, again FM audio signal is exported after an audio frequency amplifier AUDIO_AMP amplifies.
In AM demodulating unit 400, the output signal of AM narrow band filter IF2_FILTER455K NB is input to the second multiplier MUX2 and synchronous pll SYNC_PLL2 simultaneously, synchronous pll SYNC_PLL2 produces carrier signal based on the output signal of AM narrow band filter IF2_FILTER455K NB, and described carrier signal is multiplied with the output signal of AM narrow band filter IF2_FILTER455K NB and obtains AM audio signal by the second multiplier MUX2.
Audio output unit 500 comprises: diverter switch SWITCH and audio frequency power amplifier AUDIO_PA, diverter switch SWITCH selects to export FM audio signal or AM audio signal under the control of control unit 600, and audio frequency power amplifier AUDIO_PA then carries out power amplification to the output FM audio signal exported or AM audio signal.
Control unit 600 comprises PC and single-chip microprocessor MCU, and wherein, single-chip microprocessor MCU sends control signal to the first local oscillator unit and audio output unit 500 under the control of PC.Concrete, PC is connected with single-chip microprocessor MCU by RS232 interface, under the control of PC, single-chip microprocessor MCU is on the one hand by SPI(Serial Peripheral Interface--Serial Peripheral Interface (SPI)) transmit control signal to the numerical control phase-locked loop RF_PLL in the first local oscillator unit, to produce required voltage controlled oscillator VCO output frequency, such as, when the first intermediate frequency information is 10.7MHz, required voltage controlled oscillator VCO output frequency is 77 ~ 127MHz; On the other hand, single-chip microprocessor MCU transmits control signal to the diverter switch SWITCH of audio output unit 500, carries out selection export FM audio signal and AM audio signal.
In side circuit design, preferably, pre-filtering amplifying unit can be formed by ASL033 chip, C8051F310 chip forms control unit 600, MC3363 chip forms superhet frequency conversion receiver unit 200 and FM demodulating unit 300, NE565 chip and MC1496BD chip form AM demodulating unit 400, the voltage controlled oscillator VCO of MC145170D2 chip and MC3363 built-in chip type forms the first local oscillator unit, and MC3363 chip internal oscillating circuit and external 10.245MHz crystal form the second local oscillator unit.The audio output interface of audio output unit 500 adopts standard 3.5mm audio connector.
In addition, optionally, first multiplier MUX and the second multiplier MUX2 can adopt MC1496 chip, audio frequency power amplifier AUDIO_PA can adopt LM386 chip, diverter switch SWITCH can adopt CD4066 chip, driving amplifier RF_AMP can adopt MPS5176 chip, and operational amplifier OP1 adopts AD620 chip, and numerical control phase-locked loop RF_PLL can adopt MC145170-2 chip.
In order to solve the problem in background technology, the embodiment of the present invention provides a kind of double mode voice demodulated equipment, the voice demodulation of FM and AM can be carried out to the voice signal of frequency a certain within the scope of 88 ~ 138MHz simultaneously, by analyzing demodulation voice quality out, just the interference analysis between frequency-modulation broadcasting and very high frequency(VHF) earth-space communication can provide and directly adjudicate data and parameter, improve the efficiency of interference analysis greatly.
By the explanation of embodiment, should to the present invention for the technological means reaching predetermined object and take and effect be able to more deeply and concrete understanding, but appended diagram be only to provide with reference to and the use of explanation, be not used for being limited the present invention.
Claims (10)
1. a double mode voice demodulated equipment, is characterized in that, comprising:
Antenna element, superhet double conversion receiving element, FM demodulating unit, AM demodulating unit, audio selection output unit and control unit, wherein,
The radio signal of the 88 ~ 138MHz received is inputted superhet double conversion receiving element by antenna element, superhet double conversion receiving element is divided into two-way after carrying out frequency-conversion processing to described radio signal under the control of the control unit, one tunnel obtains FM audio signal through the demodulation of FM demodulating unit, another road obtains AM audio signal through the demodulation of AM demodulating unit, and audio output unit is selected to export FM audio signal or AM audio signal under the control of the control unit.
2. double mode voice demodulated equipment according to claim 1, is characterized in that, superhet double conversion receiving element comprises: the first mixing unit, the first local oscillator unit, the second mixing unit and the second local oscillator unit, wherein,
First local oscillator unit produces the first local oscillation signal with fixing stepping under the control of the control unit and is input to the first mixing unit within the scope of setpoint frequency, the radio signal of 88 ~ 138MHz and the first local oscillation signal are carried out mixing by the first mixing unit, produce the first intermediate-freuqncy signal, be input to the second mixing unit;
The second local oscillation signal that second local oscillator unit produces fixed numbers is input to the second mixing unit, and the first intermediate-freuqncy signal and the second local oscillation signal are carried out mixing by the second mixing unit, produce the second intermediate-freuqncy signal.
3. double mode voice demodulated equipment according to claim 2, is characterized in that, superhet double conversion receiving element also comprises: pre-filtering amplifying unit and intermediate frequency amplification filtering unit, wherein,
Pre-filtering amplifying unit, is connected between antenna element and the first mixing unit, carries out filtering and amplification to the radio signal of 88 ~ 138MHz that antenna element receives;
Intermediate frequency amplification filtering unit comprises: the first intermediate frequency amplifier, the first filter and the second intermediate frequency amplifier, wherein, first intermediate frequency amplifier and the first filter are connected in turn between the first mixing unit and the second mixing unit, the first intermediate-freuqncy signal that first mixing unit exports is amplified and filtering, is input to the second mixing unit; Second intermediate frequency amplifying unit is connected to the output of the second mixing unit, amplifies the second intermediate-freuqncy signal that the second mixing unit exports.
4. double mode voice demodulated equipment according to claim 2, it is characterized in that, in the first local oscillator unit, numerical control phase-locked loop, loop filter, operational amplifier are connected successively with voltage controlled oscillator, driving amplifier feeds back to numerical control phase-locked loop after the output of voltage controlled oscillator being amplified, numerical control phase-locked loop simultaneously reception control unit control signal and under the control of this control signal, carry out work.
5. double mode voice demodulated equipment according to claim 2, is characterized in that, in the second local oscillator unit, oscillator coordinates external crystal to produce the second local oscillation signal.
6. double mode voice demodulated equipment according to claim 4, it is characterized in that, in loop filter, the output of numerical control phase-locked loop is connected to one end of the first resistance, the other end of the first resistance is successively by the second resistance and the first capacity earth, and the other end of described first resistance is also connected to operational amplifier as the output of loop filter.
7. double mode voice demodulated equipment according to claim 1, it is characterized in that, in FM demodulating unit, the output signal of FM broadband filter is input to the first multiplier after limiting amplifier process, the output signal of limiting amplifier obtains corresponding orthogonal signalling after the process of orthogonal phase shift coil simultaneously, also be input to the first multiplier, the output signal of limiting amplifier is multiplied with described orthogonal signalling and obtains FM audio signal by the first multiplier.
8. double mode voice demodulated equipment according to claim 1, it is characterized in that, in AM demodulating unit, the output signal of AM narrow band filter is input to the second multiplier and synchronous pll simultaneously, synchronous pll produces carrier signal based on the output signal of AM narrow band filter, and described carrier signal is multiplied with the output signal of AM narrow band filter and obtains AM audio signal by the second multiplier.
9. double mode voice demodulated equipment according to claim 1, it is characterized in that, audio output unit comprises: diverter switch and audio frequency power amplifier, diverter switch is selected to export FM audio signal or AM audio signal under the control of the control unit, and audio frequency power amplifier then carries out power amplification to the output FM audio signal exported or AM audio signal.
10. double mode voice demodulated equipment according to claim 1, it is characterized in that, control unit comprises PC and single-chip microcomputer, and wherein, single-chip microcomputer sends control signal to the first local oscillator unit and audio output unit under the control of PC.
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| CN201310410346.4A CN104426556A (en) | 2013-09-10 | 2013-09-10 | Dual-mode voice demodulation equipment |
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| CN201310410346.4A CN104426556A (en) | 2013-09-10 | 2013-09-10 | Dual-mode voice demodulation equipment |
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Citations (4)
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| CN1234147A (en) * | 1996-10-07 | 1999-11-03 | 科布拉电子有限公司 | Radio with improved reception |
| CN1265242A (en) * | 1997-07-31 | 2000-08-30 | T·I·F·株式会社 | Radio receiver |
| WO2007042855A1 (en) * | 2005-10-14 | 2007-04-19 | Nokia Corporation | Electronic device, system, chip and method enabling a radio signal reception |
| CN101060347A (en) * | 2006-04-17 | 2007-10-24 | 阿尔卑斯电气株式会社 | AM and FM broadcast receiving circuit |
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2013
- 2013-09-10 CN CN201310410346.4A patent/CN104426556A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1234147A (en) * | 1996-10-07 | 1999-11-03 | 科布拉电子有限公司 | Radio with improved reception |
| CN1265242A (en) * | 1997-07-31 | 2000-08-30 | T·I·F·株式会社 | Radio receiver |
| WO2007042855A1 (en) * | 2005-10-14 | 2007-04-19 | Nokia Corporation | Electronic device, system, chip and method enabling a radio signal reception |
| CN101060347A (en) * | 2006-04-17 | 2007-10-24 | 阿尔卑斯电气株式会社 | AM and FM broadcast receiving circuit |
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Application publication date: 20150318 |