CN202524419U - Signal modulation system - Google Patents
Signal modulation system Download PDFInfo
- Publication number
- CN202524419U CN202524419U CN2012200262602U CN201220026260U CN202524419U CN 202524419 U CN202524419 U CN 202524419U CN 2012200262602 U CN2012200262602 U CN 2012200262602U CN 201220026260 U CN201220026260 U CN 201220026260U CN 202524419 U CN202524419 U CN 202524419U
- Authority
- CN
- China
- Prior art keywords
- signal
- frequency
- modulation
- controlled oscillator
- utility
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Transmitters (AREA)
- Transceivers (AREA)
Abstract
The utility model provides a signal modulation system. The signal modulation system comprises a first voltage-controlled oscillator which is used for modulating input signals to generate first frequency modulation signals, a second voltage-controlled oscillator which is used for modulating input signals to generate second frequency modulation signals, and an amplitude modulator for amplitude modulation which is connected with the first voltage-controlled oscillator and the second voltage-controlled oscillator. According to the signal modulation system, transmission of data signals occupies comparatively small bandwidth, a large amount of data can be transmitted without high frequency, the transmission distance is far, base stations can be reduced greatly and the transmission cost can be reduced.
Description
Technical field
The utility model relates to communication technical field, relates in particular to a kind of signal modulating system.
Background technology
AM (Amplitude Modulation, amplitude modulation) and FM (frequency modulation, frequency modulation) technology are the most frequently used modulation techniques in the signal transmission.To be the amplitude that makes high-frequency carrier signal change with the transient change of modulation signal AM.That is to say,, make the information of modulation signal be incorporated among the high-frequency signal, launch, just also blazed abroad modulation signal then through sky bundle of lines high-frequency signal through change the amplitude size of high-frequency signal with modulation signal.FM is the modulation system that carrier frequency is changed according to modulation signal.And in practical application, AM modulation technique acquisition frequency bandwidth is 2 times of signal frequency bandwidth, and signal is disturbed easily; Can only transmit a cover vision signal such as the bandwidth of 8MHZ; FM modulation technique acquisition frequency bandwidth is 5 times of signal frequency bandwidth, and is anti-interference strong, and a cover vision signal takies the bandwidth of 20MHZ; But occupied bandwidth is too much, the modulation of present applied audio signal.Also have a kind of phasing technique at present, its occupied bandwidth is less, to carrying out the carrier wave phase modulation after the video signal digitization compression; The bandwidth of 8MHZ can be transmitted 8 cover vision signals, but its modulation, demodulation are all complicated, realize difficulty; And the frequency bandwidth utilization is not high yet, and power consumption is bigger.
Can know that to sum up existing signal modulation technique obviously exists inconvenience and defective, so be necessary to improve on reality is used.
The utility model content
To above-mentioned defective, the purpose of the utility model is to provide a kind of signal modulating system, and its transmission of data signals occupied bandwidth is less, and long transmission distance, and cost is lower.
To achieve these goals, the utility model provides a kind of signal modulating system, comprising:
Be used for first voltage controlled oscillator that the frequency modulation control input signal produces first FM signal;
Be used for second voltage controlled oscillator that the frequency modulation control input signal produces second FM signal;
The amplitude modulator that is used for amplitude modulation all is connected with second voltage controlled oscillator with said first voltage controlled oscillator.
According to the signal modulating system of the utility model, said amplitude modulator is through the amplitude modulator of said first FM signal to the second FM signal amplitude modulation.
According to the signal modulating system of the utility model, said second FM signal and first FM signal have fixing difference on the frequency.
According to the signal modulating system of the utility model, the said second FM signal frequency is 5～10 times of the first FM signal frequency.
The utility model carries out frequency modulation respectively to input signal and obtains first FM signal and second FM signal through two voltage controlled oscillators are set; The output of two voltage controlled oscillators all is connected in an amplitude modulator; This amplitude modulator is handled through with first FM signal second FM signal being carried out amplitude modulation, obtains stable modulation signal whereby.By this modulation system, modulation signal transmission of data signals occupied bandwidth is less, and it needn't can transmit lot of data in high-frequency, and long transmission distance, can reduce the base station in a large number, reduces transmission cost.
Description of drawings
Fig. 1 is the structural representation of the signal modulating system of the utility model one embodiment;
Fig. 2 is the structural representation of the signal modulating system of another embodiment of the utility model.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Referring to Fig. 1, the utility model provides a kind of signal modulating system, and it can be used for the modulation of audio frequency, vision signal, and in concrete the application, this modulating system 100 comprises:
First voltage controlled oscillator 10 is used for receiving inputted signal, and this input signal is carried out exporting first FM signal after the frequency modulation control.
Second voltage controlled oscillator 20 is used for receiving inputted signal, and this input signal is carried out exporting second FM signal after the frequency modulation control.
Preferably, among the embodiment of the utility model, second FM signal and first FM signal have fixing difference on the frequency, amplitude modulation is handled be optimized.Concrete, the frequency of second FM signal is 5～10 times of the first FM signal frequency.When amplitude modulator 30 carries out amplitude modulation; First FM signal carries out the modulation signal that amplitude modulation will produce a fixed-frequency changes in amplitude to second FM signal; Theoretical occupied bandwidth is zero, and in the practical application, a cover vision signal occupied bandwidth can be controlled in the 5KHz; Whereby, the utility model makes and can transmit 1000 cover vision signals in the bandwidth of 8MHz.
The data-signal occupied bandwidth of modulating system 100 modulation transmissions of the utility model is very little, needn't can transmit lot of data in high-frequency, and the distance of each base station transmits is far away, can reduce the base station in a large number, reduces transmission cost.Such as the intermediate-freuqncy signal wireless transmit transmission that can use when the transmission video signal between the 20MHZ-30MHZ; Utilize the ionospheric reflection transmission signals can realize that the whole nation watches with a base station; Can reduce a large amount of transmission costs, also can realize outlying mountain area's all standing, certainly; Other signal also can adopt the intermediate-freuqncy signal wireless transmit transmission with upper frequency such as audio frequency and digital signal.
The utility model also provides other a kind of modulating system; As shown in Figure 2; Input signal carries out analog-to-digital conversion through an analog to digital converter 101; Calculate the output digital signal through computer system 102 then, carry out the modulated output signal that digital-to-analogue conversion gets fixed-frequency to the end through 103 pairs of signals of a digital to analog converter again.
Corresponding, receiving side signal receives signal and separates timing, only needs that the signal of modulating is carried out amplitude detection and can obtain first FM signal, and then this first FM signal is carried out the signal that frequency discrimination can obtain importing, and simple in structure, power consumption is little.
In sum; The utility model carries out frequency modulation respectively to input signal and obtains first FM signal and second FM signal through two voltage controlled oscillators are set; The output of two voltage controlled oscillators all is connected in an amplitude modulator; This amplitude modulator is handled through with first FM signal second FM signal being carried out amplitude modulation, obtains stable modulation signal whereby.By this modulation system, modulation signal transmission of data signals occupied bandwidth is less, and it needn't can transmit lot of data in high-frequency, and long transmission distance, can reduce the base station in a large number, reduces transmission cost.
Certainly; The utility model also can have other various embodiments; Under the situation that does not deviate from the utility model spirit and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the utility model, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the utility model.
Claims (4)
1. a signal modulating system is characterized in that, comprising:
Be used for first voltage controlled oscillator that the frequency modulation control input signal produces first FM signal;
Be used for second voltage controlled oscillator that the frequency modulation control input signal produces second FM signal;
The amplitude modulator that is used for amplitude modulation all is connected with second voltage controlled oscillator with said first voltage controlled oscillator.
2. signal modulating system according to claim 1 is characterized in that, said amplitude modulator is through the amplitude modulator of said first FM signal to the second FM signal amplitude modulation.
3. signal modulating system according to claim 1 is characterized in that, said second FM signal and first FM signal have fixing difference on the frequency.
4. signal modulating system according to claim 1 is characterized in that, the said second FM signal frequency is 5～10 times of the first FM signal frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200262602U CN202524419U (en) | 2012-01-19 | 2012-01-19 | Signal modulation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200262602U CN202524419U (en) | 2012-01-19 | 2012-01-19 | Signal modulation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202524419U true CN202524419U (en) | 2012-11-07 |
Family
ID=47107343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200262602U Expired - Lifetime CN202524419U (en) | 2012-01-19 | 2012-01-19 | Signal modulation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202524419U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019024620A1 (en) * | 2017-08-02 | 2019-02-07 | 中兴通讯股份有限公司 | Data transmission method, apparatus and device based on modulated signal, and storage medium |
-
2012
- 2012-01-19 CN CN2012200262602U patent/CN202524419U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019024620A1 (en) * | 2017-08-02 | 2019-02-07 | 中兴通讯股份有限公司 | Data transmission method, apparatus and device based on modulated signal, and storage medium |
| US11374802B2 (en) | 2017-08-02 | 2022-06-28 | Zte Corporation | Data transmission method, apparatus and device based on modulated signal, and storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101867546B (en) | Method for measuring and compensating satellite communication link carrier frequency offset | |
| CN101714961B (en) | Digital signal transmitting method and equipment based on modulated carriers of equal amplitude and equal period | |
| CN104079310A (en) | Ultrashort wave data transmission receiving system based on software radio architecture and receiving method thereof | |
| CN102751998A (en) | Data intermediate frequency module based on software radio receiver | |
| CN103281275A (en) | Minimum shift keying/Gaussian Filtered minimum shift keying (MSK/GMSK) direct sequence spread spectrum signal receiver | |
| CN101714959A (en) | Analog/digital signal compound transfer transmitter and receiver | |
| CN104767569A (en) | Blue-green laser transmission system in optical communication | |
| US8965290B2 (en) | Amplitude enhanced frequency modulation | |
| CN202524419U (en) | Signal modulation system | |
| CN202168070U (en) | AIS radio frequency emitter | |
| CN203243319U (en) | Ultrashort wave digital information processing apparatus with configurable waveforms | |
| CN103067069B (en) | Miniaturization satellite communication transmitter-receiver device capable of dynamically managing power consumption | |
| CN204145459U (en) | A kind of Sampling for Wide-Band Signal and conversion equipment | |
| CN101753495A (en) | Very minimum chirp keying ultra-narrow bandwidth broadcast communication modulation method | |
| CN204789999U (en) | Compass navigation satellite system transceiver chip of single scale intergration | |
| CN204009079U (en) | Differential position system, frequency-modulated broadcast transmitter, navigation signal receiver | |
| CN202772885U (en) | Novel automatic communication system | |
| CN204229627U (en) | A kind of RF turns infrared equipment | |
| CN103138776A (en) | Multiple output Zigbee launcher | |
| CN204652586U (en) | A kind of GB terrestrial digital TV regenerative modulator | |
| CN204362061U (en) | Portable railway Radio Train Dispatch Communication System disturbed test device | |
| CN208241654U (en) | A kind of communication system data flow transmitting device | |
| CN203289577U (en) | Video and audio recorder realizing short-distance wireless transceiving system | |
| CN103533346B (en) | DVB-S and DVB-S2 automatic signal detection system and method | |
| CN203104510U (en) | Mixed modulation and demodulation circuit based on OFDM |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121107 |
|
| CX01 | Expiry of patent term |