CN102438168A - Method for measuring broadcast television signal power and system thereof - Google Patents
Method for measuring broadcast television signal power and system thereof Download PDFInfo
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- CN102438168A CN102438168A CN2011103067230A CN201110306723A CN102438168A CN 102438168 A CN102438168 A CN 102438168A CN 2011103067230 A CN2011103067230 A CN 2011103067230A CN 201110306723 A CN201110306723 A CN 201110306723A CN 102438168 A CN102438168 A CN 102438168A
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Abstract
The invention provides a method for measuring broadcast television signal power. The method comprises the following steps: after a receiver receives a signal, a tuner converts a high frequency signal into an intermediate frequency signal and sends the intermediate frequency signal to a channel demodulation module and a power measurement module; the channel demodulation module carries out parameter measurement on the intermediate frequency signal, and sends a measurement result to a control and data interface; the power measurement module carries out power measurement on the intermediate frequency signal to obtain an analog electrical level, and sends the analog electrical level to an analog-to-digital conversion module; the analog-to-digital conversion module converts the analog electrical level into a digital level and sends the digital level to the control and data interface; an AGC control module generates amplification voltage of the intermediate frequency signal which is transmitted from the tuner to the power measurement module, and sends the voltage to the tuner and the control and data interface; the control and data interface sends the measurement result of the channel demodulation module, the digital level and the voltage to a host computer which calculates signal power through the digital level and the voltage. Adding components is not needed in the invention, a broadcast television signal is accurately measured, and portability of equipment is ensured.
Description
Technical field
The present invention covers the method and system of the measurement broadcast television signal power in the field of measurement about the radio and television field of measurement especially in regard to a kind of radio and television.
Background technology
Cover in the process of measuring at radio and television, broadcast television signal power is a very important technical indicator, is the important references of assessment broadcast television signal quality, and in the prior art, the broadcast television signal power measurement scheme has following two kinds:
Referring to Fig. 3; Be first kind of prior art; Be to use the measuring equipment of specialties such as frequency spectrograph to carry out signal power measurement; Its process is: at first broadcast singal is sent to radio and television test receiver and spectrum analyzer, the radio and television test receiver sends to data acquisition module with test datas such as rate of false alarm, the error rate, signal to noise ratios, and spectrum analyzer sends to data acquisition module with the signal power that records; Data acquisition module sends to host computer with above-mentioned test data, to realize the power measurement of TV signal.Though this kind utilizes the method for measurement measurement result precision of spectrum analyzer higher, the frequency spectrograph cost is higher, and covers the field testing that measurement need be a large amount of usually, and frequency spectrograph is relatively heavier, and belongs to accurate apparatus, so be difficult for portable;
Referring to Fig. 4, be second kind of prior art, be the signal strength signal intensity assessment function that utilizes the broadcast television channel demodulation chip; Come measured signal power; Its process is: broadcast singal sends to the radio and television test receiver, and the radio and television test receiver comprises tuner, channel demodulation module and control and data-interface, after broadcast singal becomes intermediate-freuqncy signal through tuner transition earlier; Be sent to the channel demodulation module; The channel demodulation module is sent to control and data interface module with parameter measurements, and control and data-interface send the initializes configuration information that host computer sends to the channel demodulation module; Make the channel demodulation module can right demodulation; Control sends the measurement data that comprises signal power in the parameter measurements to data acquisition module with data-interface, and data acquisition module sends measurement data to host computer, to realize power measurement.This kind method realizes power measurement through the signal strength signal intensity assessment function of channel demodulation chip; Need not to increase other assemblies, cost is lower and easy to operate, still; The signal strength signal intensity assessment function of channel demodulation chip can only qualitatively provide the relative size of signal, and can not measure performance number accurately.
Summary of the invention
In view of this, the present invention proposes a kind of accurately method and system of measured signal power, can be implemented under the prerequisite that does not increase the assembly cost, reach and accurately to measure broadcast television signal, can guarantee the purpose of portable devices property again.
The present invention proposes a kind of method of measuring broadcast television signal power; Wherein, Said method comprising the steps of: step 1: after the radio and television test receiver received signal, tuner sent channel demodulation module and power measurement module to after converting high-frequency signal to intermediate-freuqncy signal; Step 2: by the channel demodulation module intermediate-freuqncy signal that is sent by tuner is carried out parameter measurement, and send measurement result to control and data-interface; Step 3: carry out the dc voltage value of power measurement acquisition by power measurement module to send intermediate-freuqncy signal by tuner, and send said analog level to analog-to-digital conversion module as analog level; Step 4: analog-to-digital conversion module converts said analog level to digital level, and sends control and data-interface to; Step 5: produce the voltage that tuner is sent to the intermediate-freuqncy signal multiplication factor of power measurement module by the AGC control module, and send said voltage to tuner and control and data-interface; Step 6: control sends the measurement result of said channel demodulation module, said digital level and said voltage to host computer with data-interface, and said host computer is calculated signal power according to said digital level and said potentiometer.
Preferably, said parameter measurement comprises the measurement of modulating mode, chnnel coding efficient, signal to noise ratio, Packet Error Ratio
Preferably, said tuner changes into intermediate-freuqncy signal with high-frequency signal, sends the channel demodulation module to, simultaneously the high-frequency signal before unconverted is duplicated portion, changes into intermediate-freuqncy signal, sends power measurement module to.
Preferably, said power measurement module comprises LT5537 power measurement chip.
Preferably, said AGC control module is a digital regulation resistance.
Preferably, said host computer sends instruction, with the running parameter of control channel demodulation module and the voltage of AGC module generation.
Preferably; The running parameter of said control channel demodulation module comprises the initializes configuration information of control channel demodulation module, the operating frequency of control channel demodulation module, the modulation parameter of the automatic recall signal of control channel demodulation module or modulation parameter notified to the channel demodulation module.
The invention allows for a kind of system of measuring broadcast television signal power, wherein, said system comprises radio and television test receiver and host computer,
Said radio and television test receiver comprises: tuner sends channel demodulation module and power measurement module to after being used for converting high-frequency signal to intermediate-freuqncy signal; The channel demodulation module by the running parameter of the said channel demodulation module of PC control, is used for the intermediate-freuqncy signal that is sent by tuner is carried out parameter measurement, and sends measurement result to control and data-interface; Power measurement module is used for carrying out the dc voltage value of power measurement acquisition as analog level to sent intermediate-freuqncy signal by tuner, and sends said analog level to analog-to-digital conversion module; Analog-to-digital conversion module is used for converting the analog level that is obtained by said power measurement module to digital level, and sends control and data-interface to; The AGC control module, the voltage by the said AGC control module of PC control produces is used to regulate the voltage that tuner is sent to the intermediate-freuqncy signal multiplication factor of power measurement module, and sends said voltage to tuner and control and data-interface; Control and data-interface pass to host computer with the measurement result of said channel demodulation module, said digital level and said voltage.
Said host computer is used for the running parameter of control channel demodulation module and the output voltage of AGC module, the measurement result of receive channel demodulation module, and calculate signal power according to the digital level and the said potentiometer that receive.
Preferably, said parameter measurement comprises the measurement of modulating mode, chnnel coding efficient, signal to noise ratio, Packet Error Ratio.
Preferably; The running parameter of said control channel demodulation module comprises the initializes configuration information of control channel demodulation module, the operating frequency of control channel demodulation module, the modulation parameter of the automatic recall signal of control channel demodulation module or modulation parameter notified to the channel demodulation module.
Preferably; Said tuner comprises first tuner and second tuner; Said first tuner is used for high-frequency signal is changed into intermediate-freuqncy signal, and sends the channel demodulation module to, and said first tuner is sent to said second tuner with the high-frequency signal before unconverted simultaneously; Said second tuner is used for said high-frequency signal is changed into intermediate-freuqncy signal, and sends power measurement module to.
Preferably, said power measurement module comprises LT5537 power measurement chip.
Preferably, said AGC control module is a digital regulation resistance.
Description of drawings
Above-mentioned and/or additional aspect of the present invention and advantage are from obviously with easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is the method flow diagram according to the measurement broadcast television signal power of the embodiment of the invention;
Fig. 2 is the system schematic according to the measurement broadcast television signal power of the embodiment of the invention;
Fig. 3 is first kind of prior art system flow chart;
Fig. 4 is second kind of prior art system flow chart.
Embodiment
Describe embodiments of the invention below in detail, the example of said embodiment is shown in the drawings, and wherein identical from start to finish or similar label is represented identical or similar elements or the element with identical or similar functions.Be exemplary through the embodiment that is described with reference to the drawings below, only be used to explain the present invention, and can not be interpreted as limitation of the present invention.
Referring to Fig. 1; A kind of method of measuring broadcast television signal power for the present invention's proposition; May further comprise the steps: step 1: after the radio and television test receiver received signal, tuner sent channel demodulation module and power measurement module to after converting high-frequency signal to intermediate-freuqncy signal; Step 2: by the channel demodulation module intermediate-freuqncy signal that is sent by tuner is carried out parameter measurement, and send measurement result to control and data-interface; Step 3: carry out the dc voltage value of power measurement acquisition by power measurement module to send intermediate-freuqncy signal by tuner, and send said analog level to analog-to-digital conversion module as analog level; Step 4: analog-to-digital conversion module converts said analog level to digital level, and sends control and data-interface to; Step 5: produce the voltage that tuner is sent to the intermediate-freuqncy signal multiplication factor of power measurement module by the AGC control module, and send said voltage to tuner and control and data-interface; Step 6: control sends the measurement result of said channel demodulation module, said digital level and said voltage to host computer with data-interface, and said host computer calculates signal power through said digital level and said voltage.
Wherein, said parameter measurement comprises the measurement of modulating mode (for example QPSK modulation, 16QAM modulation), chnnel coding efficient, signal to noise ratio, Packet Error Ratio (for example LDPC rate of false alarm).
Preferably, said tuner changes into intermediate-freuqncy signal with high-frequency signal, sends the channel demodulation module to; Simultaneously the high-frequency signal before unconverted is duplicated portion; Change into intermediate-freuqncy signal, send power measurement module to, promptly carry out hoop and go out; Make that the signal be sent to channel demodulation module and power measurement module is the same, with the parameter measurement of the measurement of guaranteed output measurement module and channel demodulation module to same signal.
Preferably, said power measurement module comprises LT5537 power measurement chip, and measurement result is a dc voltage value.
Preferably, said AGC control module is a digital regulation resistance, sends instruction by host computer and controls, and is used to produce the voltage that tuner is sent to the intermediate-freuqncy signal multiplication factor of power measurement module.Wherein, Multiplication factor is meant the multiplication factor of the intermediate-freuqncy signal intensity of tuner output with respect to the high-frequency signal strength of tuner input, because the measuring range of LT5537 power measurement chip is limited, and the certainty of measurement of some measuring range is the highest in whole measuring range; So can send instruction through host computer; Let the AGC control module export a voltage, and this voltage is carried out power measurement, host computer is heightened this voltage or turn down according to measurement result; Promptly when the signal of tuner input is very strong, can turn down the output voltage of AGC control module; When the signal of tuner input is very weak, can heighten the output voltage of AGC control module, up to the suitable voltage of AGC control module output, the intermediate-freuqncy signal that can make tuner output is in the measurable scope of power measurement module.Preferably; The AGC control module can be connected to control and data-interface through the 12C bus; The data that the magnitude of voltage that host computer will be provided with is corresponding send to control and data-interface, are sent to the AGC control module through the 12C bus again, thus the output voltage of control AGC control module.Wherein, control can be USB controller, ethernet controller, flush bonding processor etc. with data-interface.
In addition; Said AGC control module also is sent to host computer with the voltage of said multiplication factor through control and data-interface; Regulate so that host computer can send instruction according to said voltage, and can calculate the signal power of the original high-frequency signal of input tuner according to said voltage and the said signal power that calculates.
Preferably; Said host computer sends instruction; The running parameter of control channel demodulation module; Comprise the initializes configuration information of control channel demodulation module, the operating frequency of control channel demodulation module, the modulation parameter of the automatic recall signal of control channel demodulation module or modulation parameter notified to the channel demodulation module, thus make the channel demodulation module can right demodulation.Host computer sends to instruction on the equipment through data-interface; Can instruction be sent to the USB controller on the equipment through USB; Through the 12C bus control channel demodulation module of USB controller, also can pass through the RJ45 interface then, utilize ethernet controller to come the control channel demodulation module.
Method of the present invention goes out function through the hoop of tuner; In channel demodulation module surveying work parameter; Cooperate power measurement module and analog-to-digital conversion module, accurate measured signal power is to be implemented under the prerequisite that does not increase the assembly cost; Reach and accurately to measure broadcast television signal, can guarantee the purpose of portable devices property again.
Referring to Fig. 2; The invention allows for a kind of system of measuring broadcast television signal power; Wherein, Said system comprises radio and television test receiver 100 and host computer 107, and said radio and television test receiver 100 comprises: tuner 101-1,101-2 send channel demodulation module 102 and power measurement module 103 to after being used for converting high-frequency signal to intermediate-freuqncy signal; Channel demodulation module 102, the running parameter by the said channel demodulation module 102 of host computer 107 controls is used for the intermediate-freuqncy signal that is sent by tuner 101-1,101-2 is carried out parameter measurement, and sends measurement result to control and data-interface 106; Power measurement module 103 is used for carrying out the dc voltage value of power measurement acquisition as analog level to sent intermediate-freuqncy signal by tuner 101-1,101-2, and sends said analog level to analog-to-digital conversion module 104; Analog-to-digital conversion module 104 is used for converting the analog level that is obtained by said power measurement module 103 to digital level, and sends control and data-interface 106 to; AGC control module 105; Voltage by said AGC control module 105 generations of host computer 107 controls; Be used to regulate the voltage that tuner 101-1,101-2 are sent to the intermediate-freuqncy signal multiplication factor of power measurement module 103, and send said voltage to tuner 101-1,101-2 and control and data-interface 106; Control and data-interface 106 send the measurement result of said channel demodulation module 102, said digital level and said voltage to host computer 107; Said host computer 107; Be used for the running parameter of control channel demodulation module 102 and the output voltage of AGC control module 105; The measurement result of receive channel demodulation module 102, digital level and said voltage, and calculate signal power according to said digital level and said potentiometer.
Wherein, said parameter measurement comprises the measurement of modulating mode (for example QPSK modulation, 16QAM modulation), chnnel coding efficient, signal to noise ratio, Packet Error Ratio (for example LDPC rate of false alarm).
Wherein, The running parameter of said host computer 107 control channel demodulation modules 102; Comprise the initializes configuration information of control channel demodulation module 102, the operating frequency of control channel demodulation module 102; The modulation parameter of control channel demodulation module 102 automatic recall signals or modulation parameter notified to channel demodulation module 102 is so that channel demodulation module 102 can right demodulation.Host computer 107 sends to instruction on the equipment through data-interface; Can instruction be sent to the USB controller on the equipment through USB; Pass through the 12C bus control channel demodulation module 102 of USB controller then; Also can pass through the RJ45 interface, utilize ethernet controller to come control channel demodulation module 102.
Preferably; Said tuner comprises the first tuner 101-1 and the second tuner 101-2, and the said first tuner 101-1 is used for high-frequency signal is changed into intermediate-freuqncy signal, and sends channel demodulation module 102 to; The said first tuner 101-1 is sent to the said second tuner 101-2 with the high-frequency signal before unconverted simultaneously; The said second tuner 101-2 is used for said high-frequency signal is changed into intermediate-freuqncy signal, and sends power measurement module 103 to, promptly carries out hoop and goes out; Go out to the hoop between the second tuner 101-2 through the first tuner 101-1; It is the same making the signal of tuner 101-1 and the second tuner 101-2 input of winning, with the parameter measurement of the measurement of guaranteed output measurement module 103 and channel demodulation module 102 to same signal.
Preferably, said power measurement module 103 comprises LT5537 power measurement chip, and measurement result is a dc voltage value.
Preferably; Said AGC control module 105 is a digital regulation resistance, sends instruction by host computer 107 and controls, and is used to produce the voltage that the second tuner 101-2 is sent to the intermediate-freuqncy signal multiplication factor of power measurement module 103; Wherein, Multiplication factor is meant the multiplication factor of the intermediate-freuqncy signal intensity of second tuner 101-2 output with respect to the high-frequency signal strength of second tuner 101-2 input, because the measuring range of LT5537 power measurement chip is limited, and the certainty of measurement of some measuring range is the highest in whole measuring range; So can send instruction through host computer 107; Let AGC control module 105 export a voltage, and this voltage is carried out power measurement, host computer 107 is heightened this voltage or turn down according to measurement result; Promptly when the signal of second tuner 101-2 input is very strong, can turn down the output voltage of AGC control module 105; When the signal of second tuner, 105 inputs is very weak; Can heighten the output voltage of AGC control module 105; Up to the suitable voltage of AGC control module 105 outputs, the intermediate-freuqncy signal that can make second tuner 101-2 output is in power measurement module 103 measurable scopes.Preferably; AGC control module 105 can be connected to control and data-interface 106 through the 12C bus; The data that the magnitude of voltage that host computer 107 will be provided with is corresponding send to control and data-interface 106; Be sent to AGC control module 105 through the 12C bus again, thus the output voltage of control AGC control module 105.Wherein, control can be USB controller, ethernet controller, flush bonding processor etc. with data-interface 106.
In addition; Said AGC control module 105 also is sent to host computer 107 with the voltage of said multiplication factor through control and data-interface 106; Regulate so that host computer 107 can send instruction according to said voltage, and can calculate the signal power of the original high-frequency signal of input tuner according to said voltage and the said signal power that calculates.
System of the present invention goes out function through the hoop of tuner; In channel demodulation module surveying work parameter; Cooperate power measurement module and analog-to-digital conversion module, accurate measured signal power is to be implemented under the prerequisite that does not increase the assembly cost; Reach and accurately to measure broadcast television signal, can guarantee the purpose of portable devices property again.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (13)
1. a method of measuring broadcast television signal power is characterized in that, said method comprising the steps of:
Step 1: after the radio and television test receiver received signal, tuner sent channel demodulation module and power measurement module to after converting high-frequency signal to intermediate-freuqncy signal;
Step 2: by the channel demodulation module intermediate-freuqncy signal that is sent by tuner is carried out parameter measurement, and send measurement result to control and data-interface;
Step 3: carry out the dc voltage value of power measurement acquisition by power measurement module to send intermediate-freuqncy signal by tuner, and send said analog level to analog-to-digital conversion module as analog level;
Step 4: analog-to-digital conversion module converts said analog level to digital level, and sends control and data-interface to;
Step 5: produce the voltage that tuner is sent to the intermediate-freuqncy signal multiplication factor of power measurement module by the AGC control module, and send said voltage to tuner and control and data-interface;
Step 6: control sends the measurement result of said channel demodulation module, said digital level and said voltage to host computer with data-interface, and said host computer is calculated signal power according to said digital level and said potentiometer.
2. the method for claim 1 is characterized in that, said parameter measurement comprises the measurement of modulating mode, chnnel coding efficient, signal to noise ratio, Packet Error Ratio.
3. the method for claim 1 is characterized in that, said step 1 comprises; Said tuner changes into intermediate-freuqncy signal with high-frequency signal, sends the channel demodulation module to, simultaneously the high-frequency signal before unconverted is duplicated portion; Change into intermediate-freuqncy signal, send power measurement module to.
4. the method for claim 1 is characterized in that, said power measurement module comprises LT5537 power measurement chip.
5. the method for claim 1 is characterized in that, said AGC control module is a digital regulation resistance.
6. the method for claim 1 is characterized in that, said host computer sends instruction, with the running parameter of control channel demodulation module and the voltage of AGC control module generation.
7. method as claimed in claim 6; It is characterized in that; The running parameter of said control channel demodulation module comprises the initializes configuration information of control channel demodulation module, the operating frequency of control channel demodulation module, the modulation parameter of the automatic recall signal of control channel demodulation module or modulation parameter notified to the channel demodulation module.
8. a system of measuring broadcast television signal power is characterized in that, said system comprises radio and television test receiver and host computer,
Said radio and television test receiver comprises:
Tuner sends channel demodulation module and power measurement module to after being used for converting high-frequency signal to intermediate-freuqncy signal;
The channel demodulation module by the running parameter of the said channel demodulation module of PC control, is used for the intermediate-freuqncy signal that is sent by tuner is carried out parameter measurement, and sends measurement result to control and data-interface;
Power measurement module is used for carrying out the dc voltage value of power measurement acquisition as analog level to sent intermediate-freuqncy signal by tuner, and sends said analog level to analog-to-digital conversion module;
Analog-to-digital conversion module is used for converting the analog level that is obtained by said power measurement module to digital level, and passes to control and data-interface;
The AGC control module, the voltage by the said AGC control module output of PC control is used to produce the voltage that tuner is sent to the intermediate-freuqncy signal multiplication factor of power measurement module, and sends said voltage to tuner and control and data-interface;
Control and data-interface pass to host computer with the measurement result of said channel demodulation module, said digital level and said voltage;
Said host computer is used for the running parameter of control channel demodulation module and the output voltage of AGC module, the measurement result of receive channel demodulation module, and calculate signal power according to the digital level and the said potentiometer that receive.
9. a system as claimed in claim 8 is characterized in that, said parameter measurement comprises the measurement of modulating mode, chnnel coding efficient, signal to noise ratio, Packet Error Ratio.
10. system as claimed in claim 8; It is characterized in that; The running parameter of said control channel demodulation module comprises the initializes configuration information of control channel demodulation module, the operating frequency of control channel demodulation module, the modulation parameter of the automatic recall signal of control channel demodulation module or modulation parameter notified to the channel demodulation module.
11. a system as claimed in claim 8 is characterized in that, said tuner comprises first tuner and second tuner,
Said first tuner is used for high-frequency signal is changed into intermediate-freuqncy signal, and sends the channel demodulation module to, and said first tuner is sent to said second tuner with the high-frequency signal before unconverted simultaneously,
Said second tuner is used for said high-frequency signal is changed into intermediate-freuqncy signal, and sends power measurement module to.
12. a system as claimed in claim 8 is characterized in that, said power measurement module comprises LT5537 power measurement chip.
13. a system as claimed in claim 8 is characterized in that, said AGC control module is a digital regulation resistance.
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