CN1567738A - Power line communication modem - Google Patents
Power line communication modem Download PDFInfo
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- CN1567738A CN1567738A CN 03130084 CN03130084A CN1567738A CN 1567738 A CN1567738 A CN 1567738A CN 03130084 CN03130084 CN 03130084 CN 03130084 A CN03130084 A CN 03130084A CN 1567738 A CN1567738 A CN 1567738A
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- power line
- line communication
- filter
- chirp
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Abstract
The invention is a power line communication modulator-demodulator (Modem), and its characteristic: it is composed of a digital signal processing part, a filter and an amplifier; the digital signal processing part can output chirp-form rectangular wave signal; the filter can filter the unnecessary components in the output signal and only allows the signal in a certain frequency region to pass through; the amplifier can amplify the pulse signal of the filter and makes it suitable for the power line communication. The invention uses bandlike filter to eliminate the unnecessary frequency range in the above pulse signal from the software and only outputs the analog signal in the needed frequency range. Therefore, it can improve the practicality of the Modem, shorten time of development, and save the expenses.
Description
Technical field
The present invention relates to power line communication modem.
Background technology
In social now a lot of fields, in order to bring into play computer advantage (Computer Power), the PC system has obtained using widely, and desktop PC (Desktop), grounding computer (Floor Standing), portable computer (Portable Microcomputer) etc. are arranged in the middle of this.
In addition, the communication of corresponding PC system is that the special circuit that utilizes existing telephone wire or coaxial cable, optical cable etc. to lay in addition transmits signal.And in corresponding PC system, for the purpose that realizes communicating by letter, also need to possess the communication terminal installation, as modulator-demodulator etc., wherein above-mentioned modulator-demodulator can give frequency modulation or amplitude modulation processing to the signal that is transmitted by telephone wire or special circuit.
Here, corresponding communication has the internally-arranged type that uses in the expansion slot that is installed in main frame and is installed in two kinds of the externally positioned types that the outside of main frame use with terminal installation, wherein internally-arranged type communication terminal installation is that supply unit from main frame obtains importing power supply there, and the externally positioned type device then need be by the power line of outside separately to its input power supply.
But there are some shortcomings in aforesaid device, be that corresponding communication also needs to possess other communication terminal card (card) with terminal installation, need possess the independent installing space that is used for installing communication usefulness terminal installation in the inside of main frame, and need independent supply unit etc.
In addition, also developed the communication mode of some new PC systems recently, promptly utilize portable terminal computer to transmit the radio communication of signal of communication, and utilize power line to transmit the power line communication of signal of communication, and these communication modes have all obtained practical application by wireless mode.Particularly power line communication is used as the power supply of communication with terminal installation because it is an electric power that transmits with signal of communication, therefore has the advantage that does not need other supply unit.
Here, be known as the modulator-demodulator of power line mode corresponding to the device of power line communication, it refers to the modulator-demodulator that communicating medium is a power line, it can transmit the data that needs are sent on the general domestic power supply of single-phase or three-phase by various modulation systems, receive data by corresponding modulation system therewith simultaneously.Because it just utilizes original power line and does not need to lay other special circuit, there is not any fund input, therefore aspect closely data communication or various automation, obtained using widely.
With reference to the accompanying drawings the power line communication modem that adopts prior art is illustrated.
As shown in Figure 1, the power line communication modem of prior art is by constituting with lower member; Promptly be used for the microcomputer (micom) (11) of the digital signal transition squaring signal of input; Be used for the above-mentioned rectangular pulse signal by above-mentioned microcomputer (11) input is converted to the ASIC (application-specific IC) (Application SpecificIntegrated Circuit) (13) of chirp (chirp) signal that can transmit by power line; The amplifier (amplifier) that is used for above-mentioned chirp (chirp) signal from above-mentioned ASIC (13) output is carried out amplification is (15) (Amplifier).
Though do not show among the figure that above-mentioned ASIC (13) also comprises DA transducer (Convertor) and a kind of circuit, wherein the DA transducer is used for digital signal is converted to analog signal; Foregoing circuit is used for the linear frequency modulation on pulse of analog signal conversion (chirp) signal after the conversion of DA transducer.
Here, microcomputer (11) in PC network can the input conversion of signals squaring signal, thereby signal can be sent.Shown in " A ", can only embody low (low), high (high) value of digital signal from the rectangular pulse signal of microcomputer (11) output.
In addition, it is chirp (Chirp) signal that the rectangular pulse signal that has embodied low, the high value of above-mentioned digital signal can be converted into analog signal by above-mentioned ASIC (13), thereby power line communication can be realized.
In a word, microcomputer (11) is exported to ASIC (13) after can converting digital signal to rectangular pulse signal, and the DA transducer of ASIC (13) is exported after can becoming about 360 analog signals to a digital conversion of signals of 100 μ s durations (microsecond).Promptly shown in " B ",, convert thereof into the mode of sine or cosine signal then, can export analog linearity frequency modulation on pulse (chirp) signal by the analog signal of output 360 points (dot) shape in 100 μ s durations.
That is to say, the power line communication modem of prior art can utilize ASIC (13) rectangular pulse signal of the digital signal of microcomputer (11) output to be converted to chirp (chirp) signal of analog signal, pass through amplifier (15) then with chirp (chirp) signal amplification, thereby realize power line communication.
But there are following problems in the power line communication modem of aforesaid prior art.
At first, power line communication modem for prior art, for digital signal is converted to analog signal, need a kind ofly can in 1 μ s, export the high-performance DA transducer of some spots (dot) shape analog signal and the ASIC (13) that is complementary with it, and the exploitation of this element can make production cost improve.
Secondly, power line communication modem for prior art, want to utilize ASIC (13) to come to change decimal system counting method (algorism) and be not easy according to the desirable form of user, therefore this not only makes the flexibility of the exploitation aspect of power line communication modem reduce, and can make the time of exploitation elongated, thereby production efficiency is reduced.
Summary of the invention
In order to overcome the above-mentioned shortcoming that prior art exists, the invention provides a kind of power line communication modem, enable by using banded filter (Band Pass Filter:BPF), thereby save the time of exploitation and improve practicality.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of power line communication modem is characterized in that it is made of Digital Signal Processing portion, filter and amplifier; Described Digital Signal Processing portion, it can export the square-wave signal of chirp (Chirp) form; Described filter (filter), the unnecessary composition in the signal that it can be exported above-mentioned Digital Signal Processing portion is removed, and frequency is passed through at certain signal in interval; Described amplifier, it can carry out amplification to the pulse signal that has passed through described filter and handle so that it is suitable for power line communication.
Described power line communication modem, its median filter can be removed the low frequency and the radio-frequency component that have configured.
Described power line communication modem, wherein the square wave of chirp (chirp) form can increase or reduce in the frequency separation of regulation.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the schematic flow sheet of the power line communication modem of prior art
Fig. 2 is the schematic flow sheet of power line communication modem of the present invention
The number in the figure explanation:
101: Digital Signal Processing portion 103: band pass filter
105: amplifier (amplifier)
Embodiment
With reference to the accompanying drawings power line communication modem of the present invention is described in detail.
As shown in Figure 2, power line modem of the present invention is by constituting with lower member: i.e. Digital Signal Processing portion (Digital Signal Processor:DSP) (101), and it can export the square-wave signal of chirp (Chirp) form; Banded filter (Band Pass Filter:BPF) (103), the unnecessary composition in the signal that it can be exported above-mentioned Digital Signal Processing portion (101) is removed, and the signal of frequency in certain interval passed through; Amplifier (105), it can carry out amplification to the pulse signal that has passed through above-mentioned filter (103) and handle so that it is suitable for power line communication.
Here, the direct circuit that digital signal is handled can be gone up from hardware (hardware) by above-mentioned Digital Signal Processing portion (101), shown in " C ", it can by a digital signal of 100 μ s durations with 26 to " height " (high), " low " (low) form output of signal, thereby export chirp (chirp) signal with 26 zero crossings (Zero crossed point).
Here, though do not show among the figure, the square wave of above-mentioned chirp (chirp) form frequency in regulation interval can increase or reduce, thereby can prevent the destination's that produces because of noise (noise) identification error.
Can also use microcomputer (micom) to replace above-mentioned Digital Signal Processing portion (101) in addition, but do the shortcoming that exists processing speed slow like this.
In addition, above-mentioned banded filter (103) is the circuit with following purposes, and promptly it can pass through the signal of frequency in particular range from software (software) in communicator, and the signal beyond the particular range is removed.Shown in " D ", it can be being removed by the unnecessary pulse signal in pulse signal Digital Signal Processing portion (101) input, that is made up of digital signal and chirp (chirp) signal, and the frequency (1 intermediate frequency) of needs is passed through.
Here, the present invention reads the signal value of level and smooth (Smooth) that becomes by the following method, thus can obtain along with " height " of above-mentioned digital signal (high), " low " (low) value and the pulse signal that changes is that frequency has been passed through the analog signal of modulating.Wherein the pulse signal that refers in the 100～400kHz interval that only makes in the pulse signal that is made of the square-wave signal of chirp (chirp) form of said method passes through, and the method for the removal of the high and low frequency composition in the pulse signal.
Therefore power line communication modem of the present invention can utilize with lower member and realize power line communication, and these parts are: Digital Signal Processing portion (101), and it can export the signal that has loaded chirp (chirp) signal on digital signal; Banded filter (103), it can be removed unwanted low frequency and high frequency, and the frequency in the particular range is passed through, thereby obtains the analog signal that frequency has been passed through modulation.
The result is a power line communication modem of the present invention by adopting above-mentioned banded filter (103), can overcome the shortcoming because of adopting ASIC to produce in the prior art, problems such as long and expense height of time low as applicability, exploitation.
As mentioned above, power line communication modem of the present invention can be realized power line communication by the following method in in-plant network service, promptly can utilize Digital Signal Processing portion (101) from hardware, will load the pulse signal output of chirp (chirp) signal in digital signal, utilize banded filter (103) that the unwanted pulse signal in the above-mentioned pulse signal is removed from software, only make the frequency that needs by and it is modulated, thereby the analog signal of converting thereof into.
The effect of invention
As mentioned above, power line communication modem of the present invention can reach following effect.
Power line communication modem of the present invention can utilize Digital Signal Processing section from the hardware will Loaded the output of pulse signal of chirp (Chirp) signal on the data signal, utilized banded Wave filter is removed the unwanted frequency band in the above-mentioned pulse signal from software, only output is in needs Frequency band in analog signal. Therefore can solve existing power line communication modulation by the present invention reconciles The low problem of practicality that device exists, and can shorten time and the cost saving of exploitation.
Claims (3)
1, a kind of power line communication modem is characterized in that it is made of Digital Signal Processing portion, filter and amplifier; Described Digital Signal Processing portion, it can export the square-wave signal of chirp (Chirp) form; Described filter (filter), the unnecessary composition in the signal that it can be exported described Digital Signal Processing portion is removed, and frequency is passed through at certain signal in interval; Described amplifier, it can carry out amplification to the pulse signal by described filter and handle so that it is suitable for power line communication.
2, power line communication modem according to claim 1 is characterized in that described filter can be with low frequency and the radio-frequency component removal that has configured.
3, power line communication modem according to claim 1 is characterized in that the square wave of described chirp (chirp) form can increase or reduce in the frequency separation of regulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03130084 CN1567738A (en) | 2003-06-17 | 2003-06-17 | Power line communication modem |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03130084 CN1567738A (en) | 2003-06-17 | 2003-06-17 | Power line communication modem |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1567738A true CN1567738A (en) | 2005-01-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03130084 Pending CN1567738A (en) | 2003-06-17 | 2003-06-17 | Power line communication modem |
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| CN (1) | CN1567738A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101102127B (en) * | 2007-07-31 | 2010-05-19 | 南京中网通信有限公司 | Application method of power modem in emergent communication |
| CN103236914A (en) * | 2013-04-16 | 2013-08-07 | 深圳市力合微电子有限公司 | Synchronous signal generating method and device of power line carrier communication system |
| CN111466086A (en) * | 2017-11-22 | 2020-07-28 | 罗伯特·博世有限公司 | Method and system for suppressing interference signal in detecting chirp signal |
-
2003
- 2003-06-17 CN CN 03130084 patent/CN1567738A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101102127B (en) * | 2007-07-31 | 2010-05-19 | 南京中网通信有限公司 | Application method of power modem in emergent communication |
| CN103236914A (en) * | 2013-04-16 | 2013-08-07 | 深圳市力合微电子有限公司 | Synchronous signal generating method and device of power line carrier communication system |
| CN103236914B (en) * | 2013-04-16 | 2016-02-03 | 深圳市力合微电子股份有限公司 | A kind of synchronizing signal generating method of power-line carrier communication system and device |
| CN111466086A (en) * | 2017-11-22 | 2020-07-28 | 罗伯特·博世有限公司 | Method and system for suppressing interference signal in detecting chirp signal |
| CN111466086B (en) * | 2017-11-22 | 2021-12-31 | 罗伯特·博世有限公司 | Method and system for suppressing interference signal in detecting chirp signal |
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