CN1925476A - Automatic switching method for demodulation mode - Google Patents
Automatic switching method for demodulation mode Download PDFInfo
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- CN1925476A CN1925476A CN 200510029360 CN200510029360A CN1925476A CN 1925476 A CN1925476 A CN 1925476A CN 200510029360 CN200510029360 CN 200510029360 CN 200510029360 A CN200510029360 A CN 200510029360A CN 1925476 A CN1925476 A CN 1925476A
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Abstract
This invention relates to modulation automatic conversion method, which comprises the following steps: according to broadcasting signal receive device open status or channel change situations, the broadcast receive device judges whether receive device can output QPSK signal or QAM signal for processing broadcasting situation; then according above judge results and if the receive device receives QPSK signals and then starting executive adjusting and demodulation operation and then outputting through adjusting and demodulation.
Description
[technical field]
The invention relates to the demodulation mode automatic switching method.Specifically, be exactly for receiving quadriphase PSK (Quadrature Phase Shift Keying, hereinafter to be referred as QPSK) signal and quadrature amplitude modulation (Quadrature Amplitude Modulation, hereinafter to be referred as QAM) broadcasting signal receiving of broadcast singal such as signal, according to the QPSK signal that it received or the concrete condition of QAM signal, and the method that demodulation mode is changed automatically.
[background technology]
Generally speaking, the method that broadcast singal is carried out demodulation comprises following two kinds: promptly satellite broadcast signal is separated QPSK (the Quadrature Phase Shift Keying) mode that timing uses; Cable broadcasting signal is separated QAM (the Quadrature Amplitude Modulation) mode that timing uses.
For above-mentioned QPSK demodulation mode, it is the demodulation mode that belongs to orthogonal phase place one class, it is the mode by load data on the phase place of the sine wave that uses carrier wave, and with certain frequency, the carrier phase of certain amplitude is equally divided into 4 equal portions (90 degree phase difference).Then, give each different phase assignments numerical value 1 or 0, or the information of 2 bits or 3 bits is once distributed, then, transmit again.The recipient is the state of the original data-signal of prior agreement with above-mentioned information translation.A kind of signal demodulation mode that above-mentioned QPSK demodulation mode comes to this.
For above-mentioned QAM demodulation mode, it is the mode that belongs to orthogonal amplitude demodulation one class, and it is that signal is classified according to the size of certain amount, then, carrier signal and phase place is changed, and simultaneously it is carried out a kind of method of demodulation.Above-mentioned QAM demodulation mode is different with above-mentioned QPSK demodulation mode, and not only its phase place can change, and can change its size.Therefore, comparatively speaking, it can transmit the numerical data of volume more simultaneously.This is the advantage that it has.
As mentioned above, for SMATV (the Satellite Master AntennaTelevision that uses above-mentioned demodulation mode, satellite control antenna TV) system, it carries out the secondary transmission to the broadcast singal by the transmission of passing of satelline ground satellite broadcasting transmitting antenna, then, this broadcast singal is distributed to a plurality of users by cable.For example: it can be used for large-scale apartment house, in this case, just on the roof of above-mentioned apartment house common antenna is set, and then, transmits broadcast singal to each user again.Like this, each user need not that antenna is set in addition again and just can connect satellite broadcast signal, and has successfully watched the satellite broadcasting program.
For this SMATV system, it is with the satellite broadcast signal that is received, and the QPSK signal that is just received carries out secondary demodulation to be handled, and is converted into the QAM signal.Then, again to each user's transmission.Like this, each user just can receive the QAM signal.Then, carry out the QAM demodulation process by user one side's digital TV set-top box again, like this, just can watch the satellite broadcasting program that is received.
From the situation of nearest satellite broadcasting worker's Skylife as can be seen, utilize above-mentioned SMATV system, use an outdoor satellite antenna, satellite broadcast signal can be carried out secondary in the mode of QAM to a plurality of users of apartment house and transmit.
As mentioned above, add after this Skylife, when the user who watches the satellite broadcasting program originally stops Skylife, and want under the situation that the satellite antenna by utilizing oneself watches the satellite broadcasting program, the user just must stop the setting of QAM demodulation mode manually, and is converted into the setting of the demodulation mode of QPSK.Like this, will be to the user with the many inconvenience of person.Particularly, concerning the unconversant domestic consumer of broadcasting-satellite system, want to allow the setting of their ground QAM demodulation mode and the setting of QPSK demodulation mode distinguish for those, this is an easy thing anything but.This is its existing shortcoming.
[summary of the invention]
Therefore, the present invention researches and develops for addressing the above problem, and the method that provides a kind of demodulation mode to change automatically for the user is provided.Demodulation mode automatic switching method for the foundation embodiments of the invention, it have QPSK tuning/demodulating equipment and QAM be tuning/demodulating equipment, like this, broadcasting signal receiving just can be according to the concrete condition of broadcast singals such as QPSK signal that it received or QAM signal, and the demodulation mode that demodulation mode is changed is automatically changed automatically.
To achieve these goals, demodulation mode automatic switching method according to embodiments of the invention has the feature that is made of following step: opens (ON) or user being in of the power supply of broadcasting signal receiving and imports request and carry out under the situation of instruction of channel change, and QPSK is tuning/demodulating equipment and QAM be tuning/and demodulating equipment just carries out the 1st step of demodulation process respectively to the broadcast singal with each autocorrelative channel;
According to the demodulation result of above-mentioned the 1st step, whether control device just can receive the 2nd step that the situation of QPSK signal or QAM signal is judged by corresponding channel to broadcasting signal receiving;
According to the judged result of above-mentioned the 2nd step, control device is just controlled conversion equipment, then, and the 3rd step that the output signal of the tuning/demodulating equipment of respective broadcast signal is changed.
It is more satisfactory being made of above several steps according to the demodulation mode automatic switching method of embodiments of the invention.
As mentioned above, for according to demodulation mode automatic switching method of the present invention, it is tuning or carry out the tuning processing of QAM that it carries out QPSK with the broadcast singal that is received, then, to the broadcast singal that is received is the QPSK signal, or the situation of QAM signal is judged.Then, according to above-mentioned judged result, automatically to through QPSK tuning/demodulating equipment or through QQM tuning/demodulating equipment carries out selecting a kind of signal in the signal after tuning/demodulation process, and it exported.Like this, just can make the user under the situation that the setting to demodulation mode does not have to change, according to own wish and the random broadcast program and the broadcast program of QAM mode to the QPSK mode listened to and watched, for the user provides great convenience.Therefore, this is a very useful invention.
[description of drawings]
Fig. 1 is that expression is applicable to the structural representation according to the broadcasting signal receiving of demodulation mode automatic switching method of the present invention.
Fig. 2 is the schematic diagram of expression according to demodulation mode automatic switching method of the present invention.
[embodiment]
Below, with reference to the accompanying drawings to being described in detail according to desirable embodiment of the present invention.At first, be described in detail being applicable to broadcasting signal receiving with reference to Fig. 1 according to demodulation mode automatic switching method of the present invention.
As shown in Figure 1, be applicable to that the broadcasting signal receiving according to demodulation mode automatic switching method of the present invention has the feature that is made of following components: promptly broadcast singal is carried out tuning processing, then, tuning information is exported here.Then, the QPSK signal of input is selected broadcast singal by the channel that the user selects, then, the QPSK that again broadcast singal that is received is carried out demodulation and output is tuning/demodulating equipment 10; After with the tuning processing of broadcast singal process, tuning information is exported, then, the QAM signal of input is selected broadcast singal by the channel that the user selects, then, again the broadcast singal that is received is carried out demodulation and output QAM tuning/demodulating equipment 11; Under the control of the control device 16 that will mention in the back, will/demodulating equipment 10 tuning from above-mentioned QPSK and QAM tuning/restituted signal exported in the tuning/demodulating equipment the demodulating equipment 11 selects the conversion equipment of then it being exported 12; To be separated into the demultplexer 13 of image/voice signal by the restituted signal that above-mentioned conversion equipment 12 is selected; Image/the acoustic information of the regulation that will separate by above-mentioned demultplexer 13 shows on picture, and it is processed into image/audio-signal processing apparatus 14 that the user can listen to image/voice signal of watching; From above-mentioned image/audio-signal processing apparatus 14, receive signal, treatedly can listen to image/sound signal outputting device 15 that image/voice signal of watching is exported with above-mentioned then through image/sound signal processing; Various piece shown in Figure 1 is controlled, reception via above-mentioned QPSK tuning/demodulating equipment 10 and QAM be tuning/tuning information that demodulating equipment 11 carries out tuning processing, then broadcasting signal receiving is judged the reception condition of QPSK signal or QAM signal, then, for can be according to above-mentioned judged result and from above-mentioned QPSK tuning/demodulating equipment 10 and QAM be tuning/a kind of signal is wherein selected and control device 16 to the control signal of regulation is exported to above-mentioned conversion equipment 12 restituted signal of demodulating equipment 11 outputs; The storage device 17 that the compulsory exercise program of above-mentioned control device 16 is stored; And the instruction inputting device of importing according to user's operation and with the action directive of the broadcasting signal receiving of channel alteration instruction, power supply control command etc. 18.
As mentioned above, for the broadcasting signal receiving that is applicable to foundation demodulation mode automatic switching method of the present invention with above-mentioned formation, if above-mentioned each tuning/demodulating equipment 10,11 can receive broadcast singal, and above-mentioned QPSK is tuning/demodulating equipment 10 and QAM be tuning/and demodulating equipment 11 just carries out tuning processing to broadcast singal.Then, the tuning result by 16 pairs of above-mentioned each tuning/10,11 pairs of broadcast singals of demodulating equipment of control device approves.Then, above-mentioned control device 16 just receives from above-mentioned each tuning/demodulating equipment 10,11 broadcast singal is carried out tuning object information after the tuning processing.Then, be to receive or can judge the QPSK signal just to the situation that the QAM signal receives to broadcasting signal receiving.Then, according to above-mentioned judged result, for can to from above-mentioned QPSK tuning/demodulating equipment 10 and QAM be tuning/a kind of signal the restituted signal of demodulating equipment 11 outputs selects and the control signal of regulation is exported to above-mentioned conversion equipment 12.Like this, above-mentioned conversion equipment 12 is just according to the situation of control signal of input, to from above-mentioned QPSK tuning/demodulating equipment 10 and QAM be tuning/a kind of signal the restituted signal of demodulating equipment 11 outputs selects, then it is exported.Then, the signal of above-mentioned selection is processed into the user through the signal processing step of regulation with it can listens to the signal of watching, and it is exported to the user.
Like this, for the broadcasting signal receiving that is applicable to according to demodulation mode automatic switching method of the present invention, it has following feature: promptly QAM broadcast singal or QPSK broadcast singal are received/demodulation, it is processed into the user can listens to the signal of watching, and it is exported to the user.
Below, with reference to Fig. 2 the demodulation mode automatic switching method of foundation embodiments of the invention is described in detail.
At first, be in according to the power supply of broadcasting signal receiving and open (ON) or in listening to the process of watching broadcast program, the user imports the concrete conditions such as instruction step S20 of request channel alteration, by above-mentioned QPSK tuning/the demodulating equipment 10 and broadcast singal of channel correlation is carried out tuning treatment step S21, then, approve by 16 pairs of tuning informations of control device.Here, in above-mentioned S21 step, be in according to the power supply of broadcasting signal receiving and open (ON) or in listening to the process of watching broadcast program, the user imports the concrete conditions such as instruction of request channel alteration, and above-mentioned QPSK is tuning/and demodulating equipment 10 just carries out tuning processing to the broadcast singal of channel correlation.
Whether after above-mentioned S21 step, above-mentioned control device 16 is just analyzed the tuning object information of being imported, then, can judge the situation that above-mentioned QPSK broadcast singal receives broadcasting signal receiving.That is to say that the situation that whether accepting state of QPSK broadcast singal is in locking (LOCK) state is carried out determining step S22.In above-mentioned S22 step, judge by 16 pairs of situations that are in locking (LOCK) state or are in non-locking (UNLOCK) state at the tuning object information of the tuning processing of above-mentioned S21 step process of control device.By said process, just can judge the situation whether above-mentioned broadcast singal may normally receive.Here, so-called lock-out state just is meant that broadcast singal can normally be received, and just refers to the good meaning of accepting state of broadcast singal.And so-called unlock state just is meant that broadcast singal can not normally be received, and just refers to the meaning of the accepting state outofkilter of broadcast singal.
According to above-mentioned judged result step S22, if judging above-mentioned QPSK signal is in the lock state, then above-mentioned conversion equipment 12 is just under the control of last nearly control device 16, / demodulating equipment 10 tuning by above-mentioned QPSK selected through the broadcast singal of the channel correlation of tuning/demodulation process, and then it is exported step S23.That is to say, be to above-mentioned QPSK tuning/demodulating equipment 10 selects/uses.
On the other hand, according to above-mentioned judged result step S22, be in unlock state if judge above-mentioned QPSK signal, then with the broadcast singal of channel correlation by above-mentioned QAM tuning/demodulating equipment 11 carries out tuning treatment step S24, then, approve by 16 pairs of tuning informations of control device.
After above-mentioned S24 step, above-mentioned control device 16 is just analyzed the tuning object information of being imported, and then, above-mentioned QAM broadcast singal is judged by situation about normally being received.That is to say, the situation whether state of above-mentioned QAM broadcast singal is in the lock state is carried out determining step S25.
Judged result according to above-mentioned S25 step, if judging above-mentioned QAM broadcast singal is in the lock state, then above-mentioned conversion equipment 12 is just under the control of above-mentioned control device 16, to by above-mentioned QAM tuning/demodulating equipment 11 selects through the broadcast singal of the channel correlation of tuning/demodulation process, then, it is exported step S26.That is to say, to above-mentioned QAM tuning/demodulating equipment 11 selects/uses.
On the other hand,, be in unlock state, then its utilization be the value step S27 of default mode (Default Mode) if judge above-mentioned QAM broadcast singal according to the judged result of above-mentioned S25 step.Here, so-called default mode just be meant can not receiving broadcast signal the meaning.This just means normally to listen to broadcast program watches.In this case, system just confirms whether the power supply of above-mentioned broadcasting signal receiving is in and closes (OFF) state, or not by the QSD form and the normal broadcast singal that receives, and corresponding prompt information can be shown on picture.In the foundation embodiments of the invention, be exactly to adopt said method in this case.
Then, just carry out determining step S28, and user's selection finishes the execution of relevant action to whether finishing relevant action.
For example: after broadcasting user one side who adds regulation, just can listen to and watched to the broadcast program that transmits by the QAM mode.In the meantime, in order can to listen to and to watch, and under the situation that antenna is provided with,, be the QPSK signal from the QAM conversion of signals with it for the signal that receives by broadcasting signal receiving to the satellite broadcasting program.Here, above-mentioned QPSK is tuning/and demodulating equipment 11 and above-mentioned QAM be tuning/and demodulating equipment 10 carries out tuning processing with the broadcast singal that receives, thereby the received broadcast conversion of signals become the QPSK signal.Like this, above-mentioned QPSK tuning/demodulating equipment 10 just is that the information of kilter is transmitted to above-mentioned control device 16 with the accepting state of relevant judgement broadcast singal.Simultaneously, above-mentioned QAM tuning/demodulating equipment 11 just is that the information of defective mode is transmitted to above-mentioned control device 16 with the accepting state of relevant judgement broadcast singal.Like this, above-mentioned control device 16 just to the broadcast singal of current reception as the QPSK signal.Simultaneously, the control signal of regulation is exported to above-mentioned conversion equipment 12.Then, just to by above-mentioned QPSK tuning/signal that demodulating equipment 10 carries out after tuning/demodulation process selects, and then it exported.
As mentioned above, different with the foregoing description is, under situation about simultaneously QPSK broadcast singal and QAM broadcast singal being received by above-mentioned broadcasting signal receiving, when the user is listening to broadcast program in the process of watching, if want channel is carried out conversion, also can modulation system change in this case.If the supposition channel is for No. 20 a QAM broadcast singal channel, channel is for No. 21 a QPSK broadcast singal channel, in this case, if the user listens in the process of watching at the broadcast program of/No. 20,11 pairs of channels of demodulating equipment tuning by QAM, wanting that it is transformed into No. 21, channel listens to the program of No. 21, channel and watches, in this case, above-mentioned QPSK is tuning/and demodulating equipment 11 and above-mentioned QAM be tuning/and demodulating equipment 10 carries out tuning processing with the broadcast singal that is received, thereby converts the broadcast singal that is received to the QPSK signal.Like this, above-mentioned QPSK tuning/demodulating equipment 10 just is that the information of kilter is transmitted to above-mentioned control device 16 with the accepting state of relevant judgement broadcast singal.Simultaneously, above-mentioned QAM tuning/demodulating equipment 11 just is that the information of defective mode is transmitted to above-mentioned control device 16 with the accepting state of relevant judgement broadcast singal.Like this, above-mentioned control device 16 just to the broadcast singal of current reception as the QPSK signal.In this state, simultaneously, the control signal of regulation is exported to above-mentioned conversion equipment 12.Then, just to by above-mentioned QPSK tuning/signal that demodulating equipment 10 carries out after tuning/demodulation process selects, and then it exported.
On the other hand, though in above-mentioned declarative procedure, just at being illustrated according to specific desirable embodiment of the present invention.But by above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.That is to say, in above-mentioned declarative procedure, just with reference to accompanying drawing at first the broadcast singal of channel correlation being carried out the QPSK demodulation according to of the present invention, and then the method for carrying out the QAM demodulation is illustrated.But at first the broadcast singal to channel correlation carries out the QAM demodulation, and then the method for carrying out the QPSK demodulation also is suitable for for the present invention.
Therefore, the technical scope of this invention is not limited to the content on the specification, must determine its technical scope according to interest field.
Claims (2)
1, demodulation mode automatic switching method comprises:
To open or the user imports request and carries out under the situation of instruction of channel change being in of the power supply of broadcasting signal receiving, quadriphase PSK is tuning/demodulating equipment and quadrature amplitude modulation be tuning/and demodulating equipment just carries out the 1st step of demodulation process respectively to the broadcast singal with each autocorrelative channel;
According to the demodulation result of above-mentioned the 1st step, whether control device just can receive the 2nd step that the situation of quadriphase PSK signal or quadrature amplitude modulated (QAM) signal is judged by corresponding channel to broadcasting signal receiving;
According to the judged result of above-mentioned the 2nd step, control device is just controlled conversion equipment, then, and the 3rd step that the output signal of the tuning/demodulating equipment of respective broadcast signal is changed.
2, as claim item 1 described demodulation mode automatic switching method, it is characterized in that above-mentioned the 2nd step is made of following step:
By quadriphase PSK tuning/demodulating equipment and quadrature amplitude modulation be tuning/demodulating equipment in the output signal of any one tuning/demodulating equipment 2-1 step that whether the relevant broadcasts signal can received situation be judged;
Judged result according to above-mentioned 2-1 step, under judging that the relevant broadcasts signal can not received situation, just by quadriphase PSK tuning/demodulating equipment and quadrature amplitude modulation be tuning/2-2 step that whether output signal of other any one tuning/demodulating equipment in the demodulating equipment can received situation be judged the relevant broadcasts signal.
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| CN 200510029360 CN1925476A (en) | 2005-09-02 | 2005-09-02 | Automatic switching method for demodulation mode |
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| CN 200510029360 CN1925476A (en) | 2005-09-02 | 2005-09-02 | Automatic switching method for demodulation mode |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008113202A1 (en) * | 2007-03-16 | 2008-09-25 | Thomson Licensing | Apparatus and method for classifying modulations in multipath environments |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008113202A1 (en) * | 2007-03-16 | 2008-09-25 | Thomson Licensing | Apparatus and method for classifying modulations in multipath environments |
| US8385473B2 (en) | 2007-03-16 | 2013-02-26 | Thomson Licensing | Apparatus and method for classifying modulations in multipath environments |
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