CN1121658A - Oscillation keying modulation OSK mode for digital signal - Google Patents
Oscillation keying modulation OSK mode for digital signal Download PDFInfo
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- CN1121658A CN1121658A CN 94120161 CN94120161A CN1121658A CN 1121658 A CN1121658 A CN 1121658A CN 94120161 CN94120161 CN 94120161 CN 94120161 A CN94120161 A CN 94120161A CN 1121658 A CN1121658 A CN 1121658A
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- 230000010355 oscillation Effects 0.000 title claims abstract description 37
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- 230000002085 persistent effect Effects 0.000 claims abstract description 4
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- 238000007493 shaping process Methods 0.000 claims description 6
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Abstract
The digital signal to be modulated and sent out is used to control the start and stop of oscillation of the high frequency crystal oscillator to send out a channel of squegging, frequency stablizing and persistent high frequency sine signals, which passes through the wired or wireless channel and reaches to the receiving end, the digital signal is recovered through the stages of frequency selective amplifier, demodulator, detector, and reshaper. Said invention features narrow occupied frequency band, powerful anti-interference capability, and simple circuit.
Description
The invention belongs to the signal processing technology field of electronic engineering.
Existing digital signal modulation mode is a lot, its essence all is the digital pulse signal with the binary level, go to modulate amplitude, frequency and the phase place of the sinusoidal signal of the continuous higher-order of oscillation that will send respectively, so produced three kinds of basic modes of amplitude keying ASK, frequency keying FSK and phase keying PSK, and developed thus and many distortion and improved mode.Continuous sinusoidal signal amplitude, a frequency or phase place discontinuous sudden change at random, all produce wave distortion inevitably and then new frequency content occurs, so existing digital signal modulation mode band occupancy is very wide, the wired or wireless transmission of digital signal is very restricted, influences its extensive use.The present invention innovates targetedly, through technical investigation and analytical evaluation and data-searching, find no the technology identical with the present invention by public or once to Patent Office of the People's Republic of China proposed the application.
The claimed technical scheme of the present invention is oscillation keying modulation OSK mode (Oscillation Shift Keying), it is digital signal with the binary level, control produces the crystal oscillator starting of oscillation on time and the failure of oscillation of the high frequency sinusoidal signal that is sent, crystal oscillator is in each rapid starting of oscillation in pulse front edge place of digital signal of input, export a persistent oscillation time frequency stabilization constant amplitude high frequency sinusoidal signal identical with the digital signal pulse duration, after the output stage amplification, send through wired or wireless channel; At each pulse back edge place of digital signal of input, the crystal oscillator failure of oscillation, the high frequency sinusoidal signal of output is ended; After receiving terminal receives this modulation signal, behind the selective frequency amplifier circuit by crystal filtering, be reduced to digital signal through detecting circuit demodulation and shaping.Also have one in addition and improve technical scheme, basic identical with such scheme, the difference part is the sinusoidal signal of crystal oscillator output each pulse back edge place of digital signal in input, failure of oscillation does not end immediately, but the sinusoidal signal for the treatment of crystal oscillator output return the zero phase prescription just failure of oscillation end, guarantee that the distortion that suddenlys change does not appear in sinusoidal signal.This performance realizes by setting up an output voltage zero cross detection circuit, the input termination crystal oscillator output voltage of zero-crossing detector, after the digital signal of its low level control signal of output of zero phase place and input the low level on edge play jointly " with " the logic control effect, make the crystal oscillator failure of oscillation, and locate in the digital signal forward position of input, the starting of oscillation of crystal oscillator is only by Digital Signals, and the output level of zero cross detection circuit does not have control action at this moment.Though the duration τ of the vibration of the high-frequency signal in this technical scheme after the modulation
oMay be greater than the width τ of the digital signal pulse of importing
iBut this time-delay does not influence the informational content of signal, because the inevitable clock frequency of the output frequency of crystal oscillator much larger than digital signal, the relative value of this error is very little, and when receiving, during with the digital signal shaping of the clock frequency identical after, can eliminate this pulsewidth error easily to demodulation with transmitting terminal.
Two kinds of above-mentioned modulation systems, the inventor is called the A scheme and the B scheme of oscillation keying modulation OSK mode.
Circuit during the invention process constitutes very simple: the modulator of transmitting terminal only is made up of a controlled crystal oscillator in the A scheme, effect is to export the high frequency sinusoidal signal that one tunnel vibration start-stop is subjected to its control constantly according to the level of the digital signal pulse of input, require its frequency of oscillation should be far above the clock frequency of digital signal, set up stable self-sustained oscillation after the starting of oscillation rapidly, good reproducibility, frequency is accurate, and wave distortion is little, and is controlled highly sensitive.The modulator circuit of B scheme and A scheme are basic identical, just set up an output voltage zero cross detection circuit, this circuit does not have control action when the crystal oscillator starting of oscillation, and the high frequency sinusoidal signal of this circuit assurance output is only being returned zero phase prescription energy failure of oscillation when crystal oscillator needs failure of oscillation, make sinusoidal waveform complete, do not have the distortion that sudden change causes.The receiving terminal demodulator of A scheme and B scheme is identical, all be to be arranged in after the crystal filtering selective frequency amplifier circuit, form by detection and shaping circuit, detecting circuit carries out envelope detection, shaping circuit is put recovery in order to before and after edge and level, and the digital signal that restores input goes decoding circuit to carry out digital demodulation, requires the circuit distortion little, highly sensitive, good stability.
The present invention has following outstanding advantage than prior art: 1, band occupancy is extremely narrow, the modulation signal of the present invention's output is the high frequency sinusoidal signal of one tunnel intermittent oscillation, frequency stabilization, distortion is very little, during each starting of oscillation from zero phase to same direction of vibration starting of oscillation, good reproducibility, particularly the signal output waveform of B scheme is even more ideal, this sinusoidal constant-amplitude signal is one extremely narrow supreme on frequency spectrum, the wire frequency band of lower sideband, informational content and energy are included among the signal carrier frequency, the frequency content of the digital signal of input is to not influence of the signal band after modulating, and the frequency bandwidth of the modulation signal of output is only relevant with its frequency stability.Compare with prior art, this extremely narrow wire frequency band has improved the utilance of frequency band greatly.2, strong interference immunity has improved sensitivity and signal to noise ratio.The anti-amplitude interference capability of digital signal is very strong, but because band occupancy is very wide, anti-frequency interferences is indifferent, the noise and the interference component that enter in the passband are big, and the present invention is prime at receiving terminal with the extremely narrow crystal filtering frequency selective amplifier of passband, can eliminate various assorted frequency noises and interference, at detection and shaping circuit subsequently, can the elimination amplitude disturb and time (width) interference, the level and the pulsewidth of rule positive digital signal, so the present invention has than existing modulation technique better resisting interference performance, and has improved combination properties such as relative signal to noise ratio and sensitivity thereupon.3, circuit is simply effective.The present invention has finished challenge in the electronic communication engineering with succinct circuit, has reduced the probability that breaks down simultaneously.
Accompanying drawing 1 is embodiment circuit block diagram and the oscillogram at different levels of technical solution of the present invention A.
Accompanying drawing 2 is embodiment circuit block diagram and the oscillogram at different levels of technical solution of the present invention B.
Claims (2)
1, the invention of oscillation keying modulation OSK mode is a kind of new technique scheme to the digital signal modulation, it is characterized in that: modulator is the crystal oscillator of controlled oscillation, the Digital Signals of input the starting of oscillation and the failure of oscillation moment of crystal oscillator, crystal oscillator is exported a persistent oscillation time τ in each rapid starting of oscillation in digital signal pulse front edge place
oWith digital signal pulse duration τ
iThe high frequency sinusoidal signal of the frequency stabilization constant amplitude that equates sends for wired or wireless channel, and the higher-order of oscillation frequency of crystal oscillator is far above the clock frequency of digital signal; At receiving terminal, after frequency-selecting was amplified, demodulator was finished the task of detection and shaping, restores digital signal, delivers to decoding circuit and carries out digital demodulation.
2, the technical scheme of vibration keying modulation system CSK according to claim 1, it is characterized in that: modulator has been set up an output voltage zero cross detection circuit, this circuit does not have control action when the crystal oscillator starting of oscillation, and this circuit returns low level control signal of zero phase place output at the crystal oscillator output voltage when crystal oscillator needs failure of oscillation, play jointly with the low level on edge after the digital signal of input " with " the logic control effect, the output signal of crystal oscillator can only can be ended by failure of oscillation returning zero phase prescription, crystal oscillator is exported a persistent oscillation time τ in each rapid starting of oscillation in digital signal pulse front edge place
oMore than or equal to digital signal pulse duration τ
iThe high frequency sinusoidal signal of frequency stabilization constant amplitude, send for wired or wireless channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94120161 CN1121658A (en) | 1994-12-22 | 1994-12-22 | Oscillation keying modulation OSK mode for digital signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94120161 CN1121658A (en) | 1994-12-22 | 1994-12-22 | Oscillation keying modulation OSK mode for digital signal |
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| Publication Number | Publication Date |
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| CN1121658A true CN1121658A (en) | 1996-05-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 94120161 Pending CN1121658A (en) | 1994-12-22 | 1994-12-22 | Oscillation keying modulation OSK mode for digital signal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005025166A1 (en) * | 2003-09-08 | 2005-03-17 | Southeast University | A method for information modulation and demodulation of high frequency band usage |
| CN103178784A (en) * | 2011-12-21 | 2013-06-26 | 北京普源精电科技有限公司 | Oscillation keying modulation method, device and function signal generator |
-
1994
- 1994-12-22 CN CN 94120161 patent/CN1121658A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005025166A1 (en) * | 2003-09-08 | 2005-03-17 | Southeast University | A method for information modulation and demodulation of high frequency band usage |
| CN103178784A (en) * | 2011-12-21 | 2013-06-26 | 北京普源精电科技有限公司 | Oscillation keying modulation method, device and function signal generator |
| CN103178784B (en) * | 2011-12-21 | 2017-02-08 | 北京普源精电科技有限公司 | Oscillation keying modulation method and device and function signal generator |
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