CN101061651B - Instrument for measuring characteristics of tuner - Google Patents
Instrument for measuring characteristics of tuner Download PDFInfo
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- CN101061651B CN101061651B CN2005800395310A CN200580039531A CN101061651B CN 101061651 B CN101061651 B CN 101061651B CN 2005800395310 A CN2005800395310 A CN 2005800395310A CN 200580039531 A CN200580039531 A CN 200580039531A CN 101061651 B CN101061651 B CN 101061651B
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- intermediate frequency
- tuner
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
- H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
- H03J1/0091—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor provided with means for scanning over a band of frequencies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/28—Measuring attenuation, gain, phase shift or derived characteristics of electric four pole networks, i.e. two-port networks; Measuring transient response
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/04—Diagnosis, testing or measuring for television systems or their details for receivers
Abstract
An instrument for measuring the characteristics of a tuner comprising means (1, 2) for sweeping the frequency (Fs) of an RF signal from the initial frequency (Fs1) to the final frequency (Fsn) and delivering the RF signal being swept to the tuner, a means (3) for detecting the voltage of a signal having an intermediate frequency, a means (4) for detecting a logarithmic voltage obtained by subjecting the voltage of a signal having an intermediate frequency to logarithmical conversion, a means (5) for detecting a voltage indicative of voltage standing wave ratio, and means (6, 7, 81, 82, 83, 1) for taking in the voltage of a signal having an intermediate frequency, the logarithmic voltage obtained by subjecting the voltage of a signal having an intermediate frequency to logarithmical conversion, and the voltage indicative of voltage standing wave ratio during a first period when the frequency (Fs) of the RF signal is swept from the initial frequency (Fs1) to the final frequency (Fsn).
Description
Technical field
The present invention relates generally to measure the device of characteristics of tuner, relate in more detail, measure the device of characteristics of tuner at high speed in order to adjust or check tuner.
Background technology
Fig. 1 representes that according to functional-block diagram prior art, that measure the device of characteristics of tuner Fig. 2 is used to explain according to flow chart prior art, that measure the method for characteristics of tuner.As shown in Figure 1, existing device has CPU1, PLL frequency synthesizer 2, linear detection unit 3, logarithmic detector unit 4, VSWR (Voltage Standing Wave Ratio (voltage standing wave ratio)) determination unit 5, switch 6 and A/D converter 7.
At first, CPU1 will be used for that tuned frequency (channel frequency) is set in assigned frequency (for example, the control signal on 801.25MHz) will output to tuner 10 (step 201).Tuner 10 and control signal correspondingly are set in tuned frequency on the assigned frequency.Tuner 10 further generates to be held tuned frequency and the intermediate frequency (frequency of for example, 43.5MHz) adding up (signal of local frequencies (for example, 844.75MHz)).
(linear determination)
CPU1 outputs to the mode of A/D converter 7 with it, configuration switch 6 (step 202) with switch 6 signal voltage that 3 inputs have intermediate frequency from the linear detection unit.
Below, CPU1 will be used for that scanning frequency (Fs) is set in the 1st frequency (original frequency), and (Fs1) (for example, the 1st control signal on 787.75MHz) outputs to PLL frequency synthesizer 2 (step 203).PLL frequency synthesizer 2 and the 1st control signal correspondingly generate the RF signal with the 1st frequency (Fs1), and it is outputed to tuner 10 and VSWR determination unit 5.The RF signal that tuner 10 has the 1st frequency (Fs1) from PLL frequency synthesizer 2 input outputs to VSWR determination unit 5 with the reflected signal of RF signal.The RF signal that tuner 10 will have the 1st frequency (Fs1) mixes with the signal that has local frequencies, generates mixed signal.Tuner 10 further uses the filter corresponding with intermediate frequency that mixed signal is carried out filtering, generates the signal with intermediate frequency.The signal that tuner 10 will have intermediate frequency outputs to linear detection unit 3 and logarithm detecting unit 4.
CPU1 judges that whether scanning frequency (Fs) (Fsn) (for example, 814.75MHz) equates or than its little (step 204) with n frequency (final frequency).When scanning frequency (Fs) equate with n frequency (Fsn) or than it hour, CPU1 judges that scanning does not finish.When scanning frequency (Fs) do not equate with n frequency (Fsn) or unlike it hour, CPU1 has judged the end of scan.
When scanning frequency (Fs) equate with n frequency (Fsn) or than it hour, CPU1 makes scanning frequency (Fs) only increase assigned frequency (Δ Fs) (for example, 0.0225MHz) (step 203) to the sweep spacing (Δ ts) of each regulation.That is, when when exporting the 1st control signal during only through the sweep spacing (Δ ts) of regulation, CPU1 will be used for the 2nd control signal that scanning frequency (Fs) is set on the 2nd frequency (Fs2=Fs1+ Δ Fs) is outputed to PLL frequency synthesizer 2.PLL frequency synthesizer 2 generates the RF signal with the 2nd frequency (Fs2), and the RF signal that tuner 10 will have the 2nd frequency mixes with the signal that has local frequencies, after this, uses the filter corresponding with intermediate frequency to generate the signal with intermediate frequency.Linear detection unit 3 detects the signal voltage with intermediate frequency, and the signal voltage that switch 6 will have intermediate frequency outputs to A/D converter 7, and the signal voltage that A/D converter 7 will have intermediate frequency is transformed into digital value, outputs to CPU1.CPU1 is after outputing to PLL frequency synthesizer 2 with the 2nd control signal, and is preceding through the sweep spacing (Δ ts) of regulation, is taken into digital value from A/D converter 7, and digital value and the 2nd frequency (Fs2) are stored (step 203) as the 2nd linear determination value.
So; PLL frequency synthesizer 2 generates the RF signal with the 1st frequency (Fs1)～n frequency (Fsn); Tuner 10 generates the signal with corresponding intermediate frequency, and CPU1 stores (step 203) with the 1st frequency (Fs1)～n frequency (Fsn) and the digital value corresponding with it as the 1st linear determination value～n linear determination value.Fig. 3 is the figure that is used for explaining the RF signal with the 1st frequency (the Fs1)～n frequency (Fsn) that is generated by the CPU1 of Fig. 1 and PLL frequency synthesizer 2.As shown in Figure 3, the frequency of RF signal increases in time together.
(logarithm mensuration)
In step 204, when judge that scanning frequency (Fs) does not equate with n frequency (Fsn) or unlike it hour, the CPU1 judgement end of scan.CPU1 with switch 6 from the logarithmic detector unit 4 inputs the signal voltage with intermediate frequency has been carried out the logarithm voltage of logarithmic transformation, and it is outputed to the mode of A/D converter 7, configuration switch 6 (step 205).
(VSWR mensuration)
In step 207, when judge that scanning frequency (Fs) does not equate with n frequency (Fsn) or unlike it hour, the CPU1 judgement end of scan.CPU1 from VSWR determination unit 5 input expression from the RF signal and the voltage of the reflected signal voltage standing wave ratio of trying to achieve, outputs to the mode of A/D converter 7 with it, configuration switch 6 (step 208) with switch 6.In addition, voltage standing wave ratio is the ratio of the maximum and the minimum of voltage standing wave(VSW).
Same with step 203 and step 204; Generation is used for scanning frequency (Fs) is set in the 1st control signal～n control signal on the 1st frequency～n frequency; PLL frequency synthesizer 2 generates the RF signal with the 1st frequency (Fs1)～n frequency (Fsn); VSWR determination unit 5 detects the voltage of the corresponding voltage standing wave ratio of expression; The digital value of the voltage of the voltage standing wave ratio that A/D converter 7 output expressions are corresponding, CPU1 stores (step 209 and step 210) with the 1st frequency (Fs1)～n frequency (Fsn) and the digital value corresponding with it as 1VSWR measured value～nVSWR measured value.
In step 210, when judge that scanning frequency (Fs) does not equate with n frequency (Fsn) or unlike it hour, the CPU1 judgement end of scan.
(demonstration of measured value)
When linear determination, logarithm mensuration and VSWR as characteristics of tuner measure end; CPU1 generates and is used to draw the control data of the 1st linear determination value～n linear determination value, the 1st logarithm measured value～n logarithm measured value and 1VSWR measured value～nVSWR measured value, and it is outputed to display.Fig. 4 is illustrated in the example that shows these measured values on the display.In Fig. 4, use straight line respectively, dotted line, 1 pecked line is represented the linear determination value, logarithm measured value and VSWR measured value.The user can simultaneously watch the characteristics of tuner that shows, one side adjustment or inspection tuner.
Summary of the invention
Measure in order 1 tuned frequency (channel frequency) to be implemented linear determination, logarithm mensuration and VSWR according to method prior art, that measure characteristics of tuner, need carry out RF signal scanning as shown in Figure 33 times.In other words, in order to adjust or check tuner, the user need wait for 3 scannings of RF signal to 1 tuned frequency.
The objective of the invention is to shorten the time of adjustment or inspection tuner.1 purpose in addition of the present invention provides the device of measuring characteristics of tuner at high speed.Other purpose of the present invention is through the working of an invention mode of the following explanation of reference and is attached to accompanying drawing and the claims in the specification, makes those skilled in the art can easily understand the present invention.
The frequency (Fs) of scanning RF signal till having from original frequency (Fs1) to final frequency (Fsn) according to the device of mensuration characteristics of tuner of the present invention, the RF signal that will be scanned outputs to the unit (1,2) of tuner (10); From the signal that tuner (10) input has intermediate frequency, detect the unit (3) of signal voltage with intermediate frequency; From the signal that tuner (10) input has intermediate frequency, detect the unit (4) of the logarithm voltage that the signal voltage with intermediate frequency has been carried out obtaining after the logarithmic transformation; From the above-mentioned RF signal of said units (1,2) input, import the reflected signal of above-mentioned RF signal, detect the unit (5) of the voltage of expression voltage standing wave ratio; With the frequency (Fs) of scanning RF signal till from original frequency (Fs1) to final frequency (Fsn) the 1st during; The logarithm voltage that is taken into signal voltage, the signal voltage with intermediate frequency has been carried out obtaining after the logarithmic transformation and the voltage of expression voltage standing wave ratio with intermediate frequency be taken into unit (6; 7,81,82; 83,1).
The above-mentioned unit that is taken into has the logarithm voltage importing signal voltage with intermediate frequency repeatedly, the signal voltage with intermediate frequency has been carried out obtaining after the logarithmic transformation and the voltage of expression voltage standing wave ratio; During the above-mentioned the 1st; Some in the logarithm voltage that just has the signal voltage of intermediate frequency, the signal voltage with intermediate frequency has been carried out obtaining after the logarithmic transformation and the voltage of expression voltage standing wave ratio carries out the unit (6,1) that handover operation is exported; Some unit that is transformed into digital value and is taken into (7,1) in the logarithm voltage that has carried out obtaining after the logarithmic transformation with the signal voltage that will have intermediate frequency, to signal voltage and the voltage of expression voltage standing wave ratio with intermediate frequency.
Perhaps, the above-mentioned unit that is taken into has: input has the signal voltage of intermediate frequency, and transforms to the unit (81,1) that digital value is taken into; Input has been carried out the logarithm voltage that obtains after the logarithmic transformation to the signal voltage with intermediate frequency, and transforms to the unit (82,1) that digital value is taken into; With the voltage of input expression voltage standing wave ratio, and transform to the unit (83,1) that digital value is taken into.
Have the tuner of CPU (1), PLL frequency synthesizer (2), linear detection unit (3), logarithmic detector unit (4), VSWR determination unit (5), switch (6) and A/D converter (7) according to the device of mensuration characteristics of tuner of the present invention.CPU (1) generates control signal to each predetermined sweep spacing (Δ ts), and the 1st control signal～n control signal is outputed to PLL frequency synthesizer (2).PLL frequency synthesizer (2), with the 1st control signal～n control signal correspondingly, generate the RF signal have to the frequency (Fs) of the 1st frequency (Fs1)～n frequency (Fsn) scanning, above-mentioned RF signal is outputed to tuner (10).Linear detection unit (3), the signal from tuner (10) input has the intermediate frequency corresponding with above-mentioned RF signal detects the signal voltage with intermediate frequency.Logarithmic detector unit (4), the signal from tuner (10) input has the intermediate frequency corresponding with above-mentioned RF signal detects the logarithm voltage that the signal voltage with intermediate frequency has been carried out logarithmic transformation.VSWR determination unit (5) from the above-mentioned RF signal of PLL frequency synthesizer (2) input, from the reflected signal of the above-mentioned RF signal of tuner (10) input, detects the voltage of expression voltage standing wave ratio.Switch (6); Import signal voltage with intermediate frequency from linear detection unit (3); Import the logarithm voltage that the signal voltage with intermediate frequency has been carried out logarithmic transformation from logarithmic detector unit (4), from the voltage of VSWR determination unit (5) input expression voltage standing wave ratio.CPU (1) is to each predetermined switch gap (Δ tt) configuration switch (6).Switch (6); To each predetermined switch gap (Δ tt), be transferred to signal voltage, the signal voltage with intermediate frequency carried out some in the voltage of logarithm voltage and expression voltage standing wave ratio of logarithmic transformation and output to A/D converter (7) with intermediate frequency.A/D converter (7) will become digital value from the signal transformation of switch (6) output, output to CPU (1).
CPU (1); The frequency (Fs) of scanning RF signal from original frequency (Fs1) to final frequency (Fsn) the 1st during, be taken into the digital value of signal voltage, the signal voltage with intermediate frequency carried out the digital value of voltage of digital value and expression voltage standing wave ratio of the logarithm voltage of logarithmic transformation from A/D converter (7) with intermediate frequency.
Device according to mensuration characteristics of tuner of the present invention also can have CPU (1), PLL frequency synthesizer (2), linear detection unit (3), logarithmic detector unit (4), VSWR determination unit (5), 1A/D transducer (81), 2A/D transducer (82), 3A/D transducer (83).The signal voltage that 1A/D transducer (81) has intermediate frequency from linear detection unit (3) input.2A/D transducer (82) has the logarithm voltage electricity that the signal voltage of middle frequency has been carried out logarithmic transformation from logarithmic detector unit (4) input.3A/D transducer (83) is from the voltage of VSWR determination unit (5) input expression voltage standing wave ratio.CPU (1) the frequency (Fs) of scanning RF signal from original frequency (Fs1) to final frequency (Fsn) the 1st during; Be taken into the digital value of signal voltage with intermediate frequency from 1A/D transducer (81); Be taken into the digital value of the signal voltage with intermediate frequency having been carried out the logarithm voltage of logarithmic transformation from 2A/D transducer (82), be taken into the digital value of the voltage of expression voltage standing wave ratio from 3A/D transducer (83).
Description of drawings
Fig. 1 representes the functional-block diagram according to the device of prior art or mensuration characteristics of tuner of the present invention.
Fig. 2 is the flow chart that is used to explain according to the method for the mensuration characteristics of tuner of prior art.
Fig. 3 is the figure that is used for explaining the RF signal with the 1st frequency (the Fs1)～n frequency (Fsn) that is generated by the CPU1 of Fig. 1 and PLL frequency synthesizer 2.
Fig. 4 representes to show the example of linear measured value, logarithm measured value and VSWR measured value.
Fig. 5 is used to explain the flow chart according to the method for mensuration characteristics of tuner of the present invention.
Fig. 6 is used to explain that the RF signal to scanning is taken into the figure of the timing of measured value.
Fig. 7 is used to explain that the RF signal to scanning is taken into the figure of the timing of measured value.
Fig. 8 representes the functional-block diagram according to the device of mensuration characteristics of tuner of the present invention.
Fig. 9 is used to explain the flow chart according to the method for mensuration characteristics of tuner of the present invention.
Figure 10 is used to explain that the RF signal to scanning is taken into the figure of the timing of measured value.
Embodiment
The working of an invention mode of explanation is illustrated in the illustrative execution mode of the invention of putting down in writing in claims below, and the present invention should not be defined in following execution mode.
(the 1st execution mode)
Device and existing device according to mensuration characteristics of tuner of the present invention are same, have CPU1, PLL frequency synthesizer 2, linear detection unit 3, logarithmic detector unit 4, VSWR determination unit 5, switch 6 and A/D converter 7.But, have and existing action different portions according to the action of CPU1 of the present invention and switch 6.Fig. 5 is used to explain the flow chart according to the method for mensuration characteristics of tuner of the present invention, and Fig. 6 is used to explain the figure that the RF signal that is scanned is taken into the timing of measured value.
At first, CPU1 will be used for the control signal that tuned frequency (channel frequency) is set on the assigned frequency is outputed to tuner 10 (step 501).Tuner 10 and control signal correspondingly are set in tuned frequency on the assigned frequency.Tuner 10 further generates the signal that has the frequency (local frequencies) that tuned frequency and intermediate frequency are added up.
Below, CPU1 will be used for that scanning frequency (Fs) is set in 1st control signal of the 1st frequency (original frequency) on (Fs1) and output to PLL frequency synthesizer 2 (step 502).PLL frequency synthesizer 2 and the 1st control signal correspondingly generate the RF signal with the 1st frequency (Fs1), and it is outputed to tuner 10 and VSWR determination unit 5.The RF signal that tuner 10 has the 1st frequency (Fs1) from PLL frequency synthesizer 2 input outputs to VSWR determination unit 5 with the reflected signal of RF signal.The RF signal that tuner 10 will have the 1st frequency (Fs1) mixes with the signal that has local frequencies, generates mixed signal.Tuner 10 further uses the filter corresponding with intermediate frequency that mixed signal is carried out filtering, generates the signal with intermediate frequency.The signal that tuner 10 will have intermediate frequency outputs to linear detection unit 3 and logarithm detecting unit 4.
When the 1st control signal is outputed to PLL frequency synthesizer 2, CPU1 configuration switch 6, its result, switch 6 signal voltage that 3 inputs have intermediate frequency from the linear detection unit, and it is outputed to A/D converter 7 (step 502).The signal voltage that A/D converter 7 will have intermediate frequency is transformed into digital value, outputs to CPU1.CPU1 is behind configuration switch, and is preceding through the switch gap (Δ tt) (for example, 1 μ sec) of regulation, is taken into digital value from A/D converter 7, and digital value and the 1st frequency (Fs1) are stored (step 502) as the 1st linear determination value.
After having set switch; When passing through the switch gap (Δ tt) of regulation; CPU1 is configuration switch 6 once more, its as a result switch 6 from the logarithmic detector unit 4 inputs the signal voltage with intermediate frequency has been carried out the logarithm voltage of logarithmic transformation, and it is outputed to A/D converter 7 (step 502).The logarithm voltage transformation that the signal voltage that A/D converter 7 will have an intermediate frequency has carried out logarithmic transformation becomes digital value, outputs to CPU1.CPU1 is once more behind the configuration switch, and is preceding through the switch gap (Δ tt) of regulation, is taken into digital value from A/D converter 7, and digital value and the 1st frequency (Fs1) are stored (step 502) as the 1st logarithm measured value.
Behind configuration switch once more; When passing through the switch gap (Δ tt) of regulation; CPU1 is configuration switch 6 once more, its as a result switch 6 and it is outputed to A/D converter 7 (step 502) from VSWR determination unit 5 input expression from the RF signal and the voltage of the reflected signal voltage standing wave ratio of trying to achieve.A/D converter 7 will represent that the voltage transformation of voltage standing wave ratio becomes digital value, outputs to CPU1.CPU1 is behind configuration switch once more, and is preceding through the switch gap (Δ tt) of regulation, is taken into digital value from A/D converter 7, and digital value and the 1st frequency (Fs1) are stored (step 502) as the 1VSWR measured value.
Through doing like this, CPU1 is to the switch gap (Δ tt) of each regulation, configuration switch 6, and it is switch 6 order of pressing linear detection unit 3, logarithmic detector unit 4 and VSWR determination unit 5 as a result, and handover operation (please with reference to Fig. 6) is carried out in the input of switch 6.In addition, when handover operation was carried out in the input of switch 6, CPU1 was taken into digital value from A/D converter 7.So CPU1 presses the order of linear determination value, logarithm detection definite value and VSWR measured value, is taken into digital value (please with reference to Fig. 6).
CPU1 judges that whether scanning frequency (Fs) (Fsn) equates or than its little (step 503) with n frequency (final frequency).When scanning frequency (Fs) equate with n frequency (Fsn) or than it hour, CPU1 is to the sweep spacing (Δ ts=3 * Δ tt) of each regulation, makes scanning frequency (Fs) only increase the frequency (Δ Fs) (step 502) of regulation.That is, CPU1 is when during only through the sweep spacing (Δ ts) of regulation, being used for the 2nd control signal that scanning frequency (Fs) is set on the 2nd frequency (Fs2=Fs1+ Δ Fs) is outputed to PLL frequency synthesizer 2 when exporting the 1st control signal.PLL frequency synthesizer 2 generates the RF signal with the 2nd frequency (Fs2), and the reflected signal that tuner 10 will have the RF signal of the 2nd frequency outputs to VSWR determination unit 5.The RF signal that tuner 10 will have the 2nd frequency mixes with the signal that has local frequencies, uses the filter corresponding with intermediate frequency to generate the signal with intermediate frequency.The signal that tuner 10 will have intermediate frequency outputs to linear detection unit 3 and logarithmic detector unit 4.
When the 2nd control signal is outputed to PLL frequency synthesizer 2, CPU1 configuration switch 6, its result, switch 6 signal voltage (step 502) that 3 inputs have intermediate frequency from the linear detection unit.CPU1 is behind configuration switch, and is preceding through the switch gap (Δ tt) of regulation, is taken into digital value from A/D converter 7, and digital value and the 2nd frequency (Fs2) are stored (step 502) as the 2nd linear determination value.
Behind configuration switch, during through the switch gap (Δ tt) of regulation, CPU1 is configuration switch 6 once more, its as a result switch 6 from the logarithmic detector unit 4 inputs the signal voltage with intermediate frequency has been carried out the logarithm voltage (step 502) of logarithmic transformation.CPU1 is behind configuration switch once more, and is preceding through the switch gap (Δ tt) of regulation, is taken into digital value from A/D converter 7, and digital value and the 2nd frequency (Fs2) are stored (step 502) as the 2nd logarithm measured value.
Behind configuration switch once more, during through the switch gap (Δ tt) of regulation, CPU1 is configuration switch 6 once more, its as a result switch 6 from the 5 input expressions of VSWR determination unit from the RF signal and the voltage (step 502) of the reflected signal voltage standing wave ratio of trying to achieve.CPU1 is behind configuration switch once more, and is preceding through the switch gap (Δ tt) of regulation, is taken into digital value from A/D converter 7, and digital value and the 2nd frequency (Fs2) are stored (step 502) as the 2VSWR measured value.
In step 503, when scanning frequency (Fs) do not equate with n frequency (Fsn) or unlike it hour, CPU1 has judged the end of scan.
So; PLL frequency synthesizer 2 generates the RF signal with the 1st frequency (Fs1)～n frequency (Fsn), and CPU1 stores (step 502) with the 1st linear determination value～n linear determination value, the 1st logarithm measured value～n logarithm measured value and 1VSWR measured value～nVSWR measured value.
According to the method for mensuration characteristics of tuner of the present invention, measure in order 1 tuned frequency (channel frequency) to be implemented linear determination, logarithm mensuration and VSWR, can only need carry out 1 time RF signal scanning as shown in Figure 3.So, can measure characteristics of tuner at high speed, shorten the time of adjustment or inspection tuner.
(the 2nd execution mode)
In the 1st execution mode; CPU1 is to switch gap (the Δ tt=Δ ts/3) configuration switch 6 of each regulation; It is switch 6 order of pressing linear detection unit 3, logarithmic detector unit 4 and VSWR determination unit 5 as a result, and handover operation (please with reference to Fig. 6) is carried out in the input of switch 6.
In the 2nd execution mode; CPU1 is to the switch gap (Δ tt=Δ ts) of each regulation; Configuration switch 6, it is switch 6 order of pressing linear detection unit 3, logarithmic detector unit 4 and VSWR determination unit 5 as a result, and handover operation (please with reference to Fig. 7) is carried out in the input of switch 6.
In the 2nd execution mode; PLL frequency synthesizer 2 generates the RF signal with the 1st frequency (Fs1)～n frequency (Fsn), and CPU1 stores the 1st linear determination value～(n/3) linear determination value, the 1st logarithm measured value～(n/3) logarithm measured value and 1VSWR measured value～(n/3) VSWR measured value.The quantity of measured value and the 1st execution mode are 1/3 of the 1st execution mode relatively, but for 1 tuned frequency (channel frequency) is implemented linear determination, logarithm is measured and VSWR measures, and can only need carry out 1 RF signal scanning as shown in Figure 31 time.So, can measure characteristics of tuner at high speed, shorten the time of adjustment or inspection tuner.
(variation of the 1st and the 2nd execution mode)
The relation of the sweep spacing (Δ ts) of the switch gap (Δ tt) of regulation and regulation is not limited to above-mentioned 2 examples.So, for example, also can be Δ tt=2 Δ ts.In addition, also can be Δ tt=Δ ts/6.Promptly; No matter the relation of the sweep spacing (Δ ts) of the switch gap (Δ tt) of regulation and regulation how; During the scanning frequency of scanning RF signal till the 1st frequency (Fs1)～n frequency (Fsn); Switch 6 can carry out handover operation to the input of switch 6 in the switch gap of stipulating arbitrarily (Δ tt).
In addition, the switch gap of regulation (Δ tt) also can not be the value of fixing.That is, the switch gap of regulation (Δ tt) also can one change in time.Equally, the sweep spacing of regulation (Δ ts) also can not be the value of fixing.
Further, switch 6 also can carry out handover operation to the input of switch 6 not according to the order of linear detection unit 3, logarithmic detector unit 4 and VSWR determination unit 5.For example, switch 6 also can carry out handover operation to the input of switch 6 by the order of linear detection unit 3, logarithmic detector unit 4, linear detection unit 3, logarithmic detector unit 4 and VSWR determination unit 5.
(the 3rd execution mode)
Fig. 8 representes the functional-block diagram according to 1 device of mensuration characteristics of tuner of the present invention; Fig. 9 is used to explain the flow chart according to 1 method of mensuration characteristics of tuner of the present invention, and Figure 10 is used to explain the figure that the RF signal that is scanned is taken into the timing of measured value.
As shown in Figure 8, in the 3rd execution mode, device of the present invention has CPU1, PLL frequency synthesizer 2, linear detection unit 3, logarithmic detector unit 4, VSWR determination unit 5 and A/ D converter 81,82 and 83.
The CPU1 of device of the present invention that does not have switch is after outputing to PLL frequency synthesizer 2 with the 1st control signal; The sweep spacing (Δ ts) of process regulation (for example; 3 μ sec) preceding; Roughly be taken into 3 digital values simultaneously from A/ D converter 81,82 and 83, the 1st linear determination value, the 1st logarithm measured value and 1VSWR measured value are stored (step 902) (please with reference to Figure 10).
So; PLL frequency synthesizer 2 generates the RF signal with the 1st frequency (Fs1)～n frequency (Fsn), and CPU1 stores (step 902) with the 1st linear determination value～n linear determination value, the 1st logarithm measured value～n logarithm measured value and 1VSWR measured value～nVSWR measured value.
(other execution mode)
Those skilled in the art can make the 1st above-mentioned execution mode～the 3rd execution mode distortion, easily constitute to be documented in the invention in claims.
For example; Also can change the 3rd execution mode; During the scanning frequency of scanning RF signal till the 1st frequency (Fs1)～n frequency (Fsn), the 1st linear determination value～h linear determination value, the 1st logarithm measured value～j logarithm measured value and 1VSWR measured value～kVSWR measured value are stored among the CPU1 independently of each other.
For example, in the 1st execution mode～the 3rd execution mode, also can reduce the scanning frequency scanning that one side is carried out the RF signal from one side till the 1st frequency (Fs1)～n frequency (Fsn).That is, also can the scanning frequency of RF signal be reduced to n frequency (Fsn)～the 1st frequency (Fs1).
Claims (6)
1. a device of measuring characteristics of tuner is characterized in that, has:
The frequency (Fs) of scanning RF signal till from original frequency (Fs1) to final frequency (Fsn), the RF signal that will be scanned outputs to the first module (1,2) of tuner (10);
From the signal that tuner (10) input has intermediate frequency, detect the unit (3) of signal voltage with intermediate frequency;
From the signal that tuner (10) input has intermediate frequency, detect the unit (4) of the logarithm voltage that the signal voltage with intermediate frequency has been carried out obtaining after the logarithmic transformation;
From the above-mentioned RF signal of above-mentioned first module (1,2) input,, detect the unit (5) of the voltage of expression voltage standing wave ratio from the reflected signal of the above-mentioned RF signal of tuner (10) input; With
Till from original frequency (Fs1) to final frequency (Fsn) during the 1st of the frequency (Fs) of scanning RF signal the; The logarithm voltage that is taken into signal voltage, the signal voltage with intermediate frequency has been carried out obtaining after the logarithmic transformation and the voltage of expression voltage standing wave ratio with intermediate frequency be taken into unit (6,7,81; 82; 83,1)
This is taken into the unit possesses:
The logarithm voltage of importing signal voltage repeatedly, the signal voltage with intermediate frequency having been carried out obtaining after the logarithmic transformation and the voltage of expression voltage standing wave ratio with intermediate frequency; During the above-mentioned the 1st; Some in the logarithm voltage that just has the signal voltage of intermediate frequency, the signal voltage with intermediate frequency has been carried out obtaining after the logarithmic transformation and the voltage of expression voltage standing wave ratio carries out the unit (6,1) that handover operation is exported; With
Some unit (7) that is transformed into digital value in the logarithm voltage that will have the signal voltage of intermediate frequency, the signal voltage with intermediate frequency has been carried out obtaining after the logarithmic transformation and the voltage of expression voltage standing wave ratio.
2. a device of measuring characteristics of tuner is characterized in that, has:
The frequency (Fs) of scanning RF signal till from original frequency (Fs1) to final frequency (Fsn), the RF signal that will be scanned outputs to the first module (1,2) of tuner (10);
From the signal that tuner (10) input has intermediate frequency, detect the unit (3) of signal voltage with intermediate frequency;
From the signal that tuner (10) input has intermediate frequency, detect the unit (4) of the logarithm voltage that the signal voltage with intermediate frequency has been carried out obtaining after the logarithmic transformation;
From the above-mentioned RF signal of above-mentioned first module (1,2) input,, detect the unit (5) of the voltage of expression voltage standing wave ratio from the reflected signal of the above-mentioned RF signal of tuner (10) input; With
Till from original frequency (Fs1) to final frequency (Fsn) during the 1st of the frequency (Fs) of scanning RF signal the; The logarithm voltage that is taken into signal voltage, the signal voltage with intermediate frequency has been carried out obtaining after the logarithmic transformation and the voltage of expression voltage standing wave ratio with intermediate frequency be taken into unit (6,7,81; 82; 83,1)
This is taken into the unit possesses:
Input has the signal voltage of intermediate frequency, and transforms to the converter unit (81) of digital value;
Input has been carried out the logarithm voltage that obtains after the logarithmic transformation to the signal voltage with intermediate frequency, and transforms to the converter unit (82) of digital value; With
The voltage of voltage standing wave ratio is represented in input, and transforms to the converter unit (83) of digital value.
3. device of measuring characteristics of tuner; This device has CPU (1), phase-locked loop frequency synthesizer (2), linear detection unit (3), logarithmic detector unit (4), voltage standing wave ratio determination unit (5), switch (6) and A/D converter (7), and the device of this mensuration characteristics of tuner is characterised in that:
CPU (1) generates control signal to the sweep spacing (Δ ts) of each regulation, and the 1st control signal～n control signal is outputed to phase-locked loop frequency synthesizer (2);
Phase-locked loop frequency synthesizer (2) generates according to the 1st control signal～n control signal to have from corresponding to the original frequency (Fs1) of the 1st control signal～corresponding to the RF signal of the frequency (Fs) that is scanned till the final frequency (Fsn) of n control signal, above-mentioned RF signal is outputed to tuner (10);
Linear detection unit (3) detects the signal voltage with intermediate frequency from the signal that tuner (10) input has the intermediate frequency corresponding with above-mentioned RF signal;
The signal that logarithmic detector unit (4) has the intermediate frequency corresponding with above-mentioned RF signal from tuner (10) input, detection have carried out the logarithm voltage that obtains after the logarithmic transformation to the signal voltage with intermediate frequency;
Voltage standing wave ratio determination unit (5) from the reflected signal of the above-mentioned RF signal of tuner (10) input, detects the voltage of expression voltage standing wave ratio from the above-mentioned RF signal of phase-locked loop frequency synthesizer (2) input;
The signal voltage that switch (6) has intermediate frequency from linear detection unit (3) input; From logarithmic detector unit (4) input the signal voltage with intermediate frequency has been carried out the logarithm voltage that obtains after the logarithmic transformation, from the voltage of voltage standing wave ratio determination unit (5) input expression voltage standing wave ratio;
CPU (1) is at switch gap (Δ tt) configuration switch (6) of each regulation;
Switch (6) is in the switch gap (Δ tt) of each regulation, and the some handover operations that carries out in the logarithm voltage that just have the signal voltage of intermediate frequency, the signal voltage with intermediate frequency has been carried out obtaining after the logarithmic transformation and the voltage of expression voltage standing wave ratio output to A/D converter (7);
A/D converter (7) will become digital value from the signal transformation of switch (6) output, output to CPU (1),
CPU (1) till from original frequency (Fs1) to final frequency (Fsn), scan the RF signal frequency (Fs) the 1st during, from A/D converter (7) be taken into the digital value of signal voltage with intermediate frequency, the digital value of the voltage of the digital value of the logarithm voltage that the signal voltage with intermediate frequency carried out obtain after the logarithmic transformation and expression voltage standing wave ratio.
4. the device of mensuration characteristics of tuner according to claim 3 is characterized in that: the switch gap of regulation (Δ tt) for the regulation sweep spacing (Δ ts) 1/3.
5. the device of mensuration characteristics of tuner according to claim 4; It is characterized in that: CPU (1) during the above-mentioned the 1st in, be taken into the 1st～the n digital value of voltage of the 1st～the n digital value and the expression voltage standing wave ratio of the logarithm voltage that the 1st～the n digital value that expression has the signal voltage of intermediate frequency, expression carried out obtaining after the logarithmic transformation to the signal voltage with intermediate frequency from A/D converter (7).
6. device of measuring characteristics of tuner; This device has CPU (1), phase-locked loop frequency synthesizer (2), linear detection unit (3), logarithmic detector unit (4), voltage standing wave ratio determination unit (5), 1A/D transducer (81), 2A/D transducer (82), 3A/D transducer (83), and the device of this mensuration characteristics of tuner is characterised in that:
CPU (1) generates control signal to the sweep spacing (Δ ts) of each regulation, and the 1st control signal～n control signal is outputed to phase-locked loop frequency synthesizer (2);
Phase-locked loop frequency synthesizer (2) generates according to the 1st control signal～n control signal to have from corresponding to the original frequency (Fs1) of the 1st control signal～corresponding to the RF signal of the frequency (Fs) that is scanned till the final frequency (Fsn) of n control signal, above-mentioned RF signal is outputed to tuner (10);
Linear detection unit (3) detects the signal voltage with intermediate frequency from the signal that tuner (10) input has the intermediate frequency corresponding with above-mentioned RF signal;
The signal that logarithmic detector unit (4) has the intermediate frequency corresponding with above-mentioned RF signal from tuner (10) input, detection have carried out the logarithm voltage that obtains after the logarithmic transformation to the signal voltage with intermediate frequency;
Voltage standing wave ratio determination unit (5) from the reflected signal of the above-mentioned RF signal of tuner (10) input, detects the voltage of expression voltage standing wave ratio from the above-mentioned RF signal of phase-locked loop frequency synthesizer (2) input;
The signal voltage that 1A/D transducer (81) has intermediate frequency from linear detection unit (3) input;
2A/D transducer (82) has carried out the logarithm voltage that obtains after the logarithmic transformation from logarithmic detector unit (4) input to the signal voltage with intermediate frequency;
3A/D transducer (83) is from the voltage of voltage standing wave ratio determination unit (5) input expression voltage standing wave ratio;
CPU (1) the frequency (Fs) of scanning RF signal from original frequency (Fs1) to final frequency (Fsn) the 1st during; Be taken into the digital value of signal voltage with intermediate frequency from 1A/D transducer (81); Be taken into the digital value of the logarithm voltage that the signal voltage with intermediate frequency has been carried out obtaining after the logarithmic transformation and be taken into the digital value of the voltage of expression voltage standing wave ratio from 3A/D transducer (83) from 2A/D transducer (82).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004334185A JP2006148407A (en) | 2004-11-18 | 2004-11-18 | Instrument for measuring characteristic of tuner |
| JP334185/2004 | 2004-11-18 | ||
| PCT/JP2005/017957 WO2006054391A1 (en) | 2004-11-18 | 2005-09-29 | Instrument for measuring characteristics of tuner |
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| Publication Number | Publication Date |
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| CN101061651A CN101061651A (en) | 2007-10-24 |
| CN101061651B true CN101061651B (en) | 2012-02-22 |
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| CN2005800395310A Expired - Fee Related CN101061651B (en) | 2004-11-18 | 2005-09-29 | Instrument for measuring characteristics of tuner |
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| JP (1) | JP2006148407A (en) |
| KR (1) | KR20070089804A (en) |
| CN (1) | CN101061651B (en) |
| TW (1) | TW200635216A (en) |
| WO (1) | WO2006054391A1 (en) |
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| CN101977087A (en) * | 2010-10-18 | 2011-02-16 | 上海新干通通信设备有限公司 | Air interface monitoring system for automatic train protection (ATP) system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5714876A (en) * | 1996-04-24 | 1998-02-03 | Tektronix, Inc. | In-service serial digital source signal-level and cable-length measurement |
| CN1309298A (en) * | 2000-02-14 | 2001-08-22 | 东光株式会社 | Tuning frequency measuring device for filter |
| JP2002305691A (en) * | 2001-04-06 | 2002-10-18 | Matsushita Electric Ind Co Ltd | High frequency device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11167565A (en) * | 1997-09-30 | 1999-06-22 | Advantest Corp | Fast fourier transform device and network analyzer |
| JP2002374167A (en) * | 2001-06-12 | 2002-12-26 | Nissin Electric Co Ltd | Analog input device for monitor control |
-
2004
- 2004-11-18 JP JP2004334185A patent/JP2006148407A/en active Pending
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2005
- 2005-09-28 TW TW094133823A patent/TW200635216A/en not_active IP Right Cessation
- 2005-09-29 CN CN2005800395310A patent/CN101061651B/en not_active Expired - Fee Related
- 2005-09-29 KR KR1020077013497A patent/KR20070089804A/en active IP Right Grant
- 2005-09-29 WO PCT/JP2005/017957 patent/WO2006054391A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5714876A (en) * | 1996-04-24 | 1998-02-03 | Tektronix, Inc. | In-service serial digital source signal-level and cable-length measurement |
| CN1309298A (en) * | 2000-02-14 | 2001-08-22 | 东光株式会社 | Tuning frequency measuring device for filter |
| JP2002305691A (en) * | 2001-04-06 | 2002-10-18 | Matsushita Electric Ind Co Ltd | High frequency device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2006148407A (en) | 2006-06-08 |
| CN101061651A (en) | 2007-10-24 |
| TWI355140B (en) | 2011-12-21 |
| WO2006054391A1 (en) | 2006-05-26 |
| KR20070089804A (en) | 2007-09-03 |
| TW200635216A (en) | 2006-10-01 |
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