WO2006054391A1 - チューナの特性を測定する装置 - Google Patents
チューナの特性を測定する装置 Download PDFInfo
- Publication number
- WO2006054391A1 WO2006054391A1 PCT/JP2005/017957 JP2005017957W WO2006054391A1 WO 2006054391 A1 WO2006054391 A1 WO 2006054391A1 JP 2005017957 W JP2005017957 W JP 2005017957W WO 2006054391 A1 WO2006054391 A1 WO 2006054391A1
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- Prior art keywords
- signal
- voltage
- frequency
- intermediate frequency
- logarithmic
- Prior art date
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Classifications
-
- 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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
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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
-
- 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
Definitions
- the present invention relates generally to an apparatus for measuring tuner characteristics, and more particularly to an apparatus for measuring tuner characteristics at high speed to adjust or inspect the tuner.
- FIG. 1 shows a functional block diagram of an apparatus for measuring tuner characteristics according to the prior art
- FIG. 2 is a diagram for explaining a technique for measuring tuner characteristics according to the prior art. It is a flow chart.
- the conventional apparatus includes a CPU 1, a PLL frequency synthesizer 2, a linear detection means 3, a logarithmic detection means 4, a VSWR (Voltage Standing Wave Ratio) measurement means 5, a switch 6, AZD converter 7 is provided.
- the CPU 1 sets a tuning frequency (channel frequency) to a predetermined frequency (for example, 801.
- a control signal for setting to 25 MHz is output to the tuner 10 (step 201).
- the tuner 10 sets the tuning frequency to a predetermined frequency according to the control signal.
- the tuner 10 further generates a signal having a frequency (local frequency (eg, 844.75 MHz)) obtained by adding a tuning frequency and an intermediate frequency (eg, 43.5 MHz).
- the CPU 1 sets the switch 6 so that the switch 6 inputs the voltage of the signal having the intermediate frequency from the linear detection means 3 and outputs it to the AZD converter 7 (step 202).
- CPU 1 sends a first control signal to PLL frequency synthesizer 2 to set the sweep frequency (Fs) to the first frequency (initial frequency) (Fsl) (eg, 7 87. 75 MHz).
- Output step 203).
- the PLL frequency synthesizer 2 generates an RF signal having the first frequency (Fsl) in response to the first control signal, and outputs it to the tuner 10 and the VSWR measurement unit 5.
- the tuner 10 inputs an RF signal having the first frequency (Fsl) from the PLL frequency synthesizer 2 and outputs a reflected signal of the RF signal to the VSWR measuring means 5.
- the una 10 mixes the RF signal having the first frequency (Fsl) with the signal having the local frequency to generate a mixed signal.
- the tuner 10 further filters the mixed signal with a filter corresponding to the intermediate frequency to generate a signal having the intermediate frequency.
- the tuner 10 outputs a signal having an intermediate frequency to the linear detection means 3 and the logarithmic detection means 4.
- the linear detection means 3 receives a signal having an intermediate frequency from the tuner 10 and detects the voltage of the signal having an intermediate frequency.
- the linear detection means 3 outputs a voltage of a signal having an intermediate frequency to the switch 6.
- the switch 6 inputs a voltage of a signal having an intermediate frequency from the linear detection means 3 and outputs it to the AZD converter 7.
- the AZD converter 7 converts the voltage of a signal having an intermediate frequency into a digital value and outputs it to the CPU 1.
- the CPU 1 acquires the digital value from the AZD converter 7 before a predetermined sweep interval (A ts) (for example, 3 ⁇ sec) elapses.
- a ts predetermined sweep interval
- the digital value and the first frequency (Fsl) are stored as the first linear measurement value (step 203).
- CPU 1 determines whether or not the sweep frequency (Fs) is equal to or less than the nth frequency (final frequency) (Fsn) (eg, 84.775 MHz)! Step 204). When the sweep frequency (Fs) is equal to or smaller than the nth frequency (Fsn), the CPU 1 determines that the sweep is not finished! When the sweep frequency (Fs) is not equal to or smaller than the nth frequency (Fsn), the CPU 1 determines that the sweep is finished.
- the CPU 1 sets the sweep frequency (Fs) to a predetermined frequency ( ⁇ Fs) (for example, 0.0225 MHz) is increased (step 203).
- ⁇ Fs a predetermined frequency
- the second control signal is output to PLL frequency synthesizer 2.
- PLL frequency synthesizer 2 generates an RF signal having the second frequency (Fs2), and tuner 10 mixes the RF signal having the second frequency with the signal having the local frequency, and then to the intermediate frequency.
- a signal having an intermediate frequency is generated by the corresponding filter.
- the linear detection means 3 detects the voltage of the signal having the intermediate frequency, and the switch 6 outputs the voltage of the signal having the intermediate frequency to the AZD converter 7.
- the AZD converter 7 converts the voltage of the signal having the intermediate frequency into a digital value and outputs it to the CPU 1.
- the CPU 1 captures the digital value from the AZD converter 7 before the predetermined sweep interval (A ts) elapses, and the digital value and the second frequency ( Fs2) is stored as the second linear measurement value (step 203).
- the PLL frequency synthesizer 2 has the first frequency (Fsl) to the nth frequency.
- FIG. 3 is a diagram for explaining an RF signal having a first frequency (Fsl) to an nth frequency (Fsn) generated by the CPU 1 and the PLL frequency synthesizer 2 in FIG. As shown in Figure 3, the frequency of the RF signal increases with time.
- step 204 when the sweep frequency (Fs) is not equal to or smaller than the nth frequency (Fsn), the CPU 1 determines that the sweep is finished.
- the CPU 1 inputs the logarithmic voltage obtained by logarithmically converting the voltage of the signal having the switch 6 force intermediate frequency from the logarithmic detection means 4 and sets the switch 6 so as to output it to the AZD converter 7 (step 205).
- the CPU 1 Similar to Step 203 and Step 204, the CPU 1 generates a first control signal to an nth control signal for setting the sweep frequency (Fs) from the first frequency to the nth frequency.
- PLL frequency synthesizer 2 generates an RF signal having a first frequency (Fsl) to an nth frequency (Fsn)
- a tuner 10 generates a signal having a corresponding intermediate frequency
- logarithmic detection means detects the logarithmic voltage of the signal having the corresponding intermediate frequency
- the AZD comparator 7 outputs the digital value of the corresponding logarithmic voltage
- CPU1 outputs the first frequency (Fsl) to the nth frequency.
- (Fsn) and the corresponding digital value are stored as the first log measurement value to the nth log measurement value (step 206 and step 207).
- the sweep frequency (Fs) is equal to or equal to the nth frequency (Fsn). If it is not smaller than this, CPU 1 determines that the sweep has been completed.
- the CPU 1 inputs the voltage representing the voltage standing wave ratio obtained from the switch 6 force RF signal and its reflected signal from the VSWR measuring means 5 and sets the switch 6 so as to output it to the AZD converter 7 (step 208).
- the voltage standing wave ratio is the ratio between the maximum value and the minimum value of the voltage standing wave.
- a first control signal to an nth control signal for setting the sweep frequency (Fs) from the first frequency to the nth frequency are generated, and the PLL frequency
- the synthesizer 2 generates an RF signal having a first frequency (Fsl) to an nth frequency (Fsn)
- the VSWR measuring means 5 detects a voltage representing a corresponding voltage standing wave ratio
- an AZD converter. 7 outputs the digital value of the voltage that represents the corresponding voltage standing wave ratio
- CPU1 measures the first frequency (Fsl) to nth frequency (Fsn) and the corresponding digital value in the first VSWR measurement. Value to the nth VSWR measurement value (steps 209 and 210).
- step 210 if the sweep frequency (Fs) is not equal to or less than the nth frequency (Fsn), the CPU 1 determines that the sweep has ended.
- CPU1 When the linear measurement, logarithmic measurement, and VSWR measurement as the tuner characteristics are completed, CPU1 performs the first linear measurement value to the nth linear measurement value, the first logarithmic measurement value to the nth logarithmic measurement value, and the first measurement value. Generates control data for plotting the 1st VSWR measurement value to the nth VSWR measurement value and outputs it to the display.
- Figure 4 shows an example where these measurements are shown on the display.
- the linear, logarithmic, and VSWR measurements are represented by a straight line, a dashed line, and a one-point dashed line, respectively. The user can adjust or inspect the tuner while looking at the characteristics of the tuner being displayed.
- the technique for measuring the characteristics of a tuner according to the prior art is as shown in Fig. 3 in order to perform linear measurement, logarithmic measurement and VSWR measurement for one tuning frequency (channel frequency).
- the RF signal must be swept three times. In other words, adjust the tuner Or, to test, the user needs to wait for 3 sweeps of the RF signal for one tuning frequency.
- An object of the present invention is to reduce the time for adjusting or inspecting a tuner. Another object of the present invention is to provide a device for measuring the characteristics of a tuner at high speed. Other objects of the present invention can be easily understood by those skilled in the art by referring to the embodiments of the invention described below, the drawings attached to the specification, and the claims. I will.
- An apparatus for measuring characteristics of a tuner sweeps the frequency (Fs) of an RF signal from the initial frequency (Fsl) to the final frequency (Fsn), and the swept RF signal is adjusted to the tuner ( 10) means (1) and (2) for outputting a signal having an intermediate frequency from the tuner (10), means for detecting the voltage of the signal having the intermediate frequency (3), and a signal having the intermediate frequency.
- the capturing means inputs a voltage of a signal having an intermediate frequency, a logarithmic voltage obtained by logarithmically converting the voltage of the signal having an intermediate frequency, and a voltage representing a voltage standing wave ratio, and in the first period Means for repeatedly switching to one of the voltage of the signal having the intermediate frequency, the logarithmic voltage obtained by logarithmically converting the voltage of the signal having the intermediate frequency, and the voltage representing the voltage standing wave ratio and outputting the voltage. Any one of (6, 1), the voltage of the signal having the intermediate frequency, the logarithmic voltage obtained by logarithmically converting the voltage of the signal having the intermediate frequency, and the voltage representing the voltage standing wave ratio are converted into a digital value. And means for taking in (7, 1).
- the means for capturing includes means (81, 1) for inputting a voltage of a signal having an intermediate frequency, converting it to a digital value, and logarithmically changing the voltage of the signal having an intermediate frequency.
- Means for inputting the converted logarithmic voltage and converting it into a digital value (82, 1); means for inputting a voltage representing the voltage standing wave ratio and converting it into a digital value (83, 1); Equipped.
- An apparatus for measuring the characteristics of a tuner includes a CPU (l), a PLL frequency synthesizer (2), a linear detection means (3), a logarithmic detection means (4), and a VSWR measurement means ( 5), switch (6), and AZD converter (7).
- CPU (l) generates a control signal at every predetermined sweep interval ( ⁇ ts) and outputs the first to nth control signals to the PLL frequency synthesizer (2).
- the PLL frequency synthesizer (2) has a frequency (Fs) swept from the first frequency (Fsl) to the nth frequency (Fsn) in response to the first control signal to the nth control signal. A signal is generated and the RF signal is output to the tuner (10).
- the linear detection means (3) receives a signal having an intermediate frequency corresponding to the RF signal as well as a tuner (10) force, and detects the voltage of the signal having the intermediate frequency.
- the logarithmic detection means (4) inputs a signal having an intermediate frequency corresponding to the RF signal, and detects a logarithmic voltage obtained by logarithmically converting the voltage of the signal having the intermediate frequency.
- the VSWR measuring means (5) receives the RF signal from the PLL frequency synthesizer (2), receives the reflected signal of the RF signal from the tuner (10), and detects a voltage representing the voltage standing wave ratio.
- the switch (6) receives the voltage of the signal having the intermediate frequency from the linear detection means (3), and inputs the logarithmic voltage obtained by logarithmically converting the voltage of the signal having the intermediate frequency from the logarithmic detection means (4). A voltage representing the wave ratio is input from the VSWR measurement means (5).
- the CPU (l) sets the switch (6) every predetermined switch interval ( ⁇ tt).
- the switch (6) includes a voltage of a signal having an intermediate frequency, a logarithmic voltage obtained by logarithmically converting the voltage of the signal having an intermediate frequency, and a voltage representing a voltage standing wave ratio at a predetermined switch interval (A tt). Switch to one of these and output to the AZD converter (7).
- the AZD converter (7) converts the signal output from the switch (6) into a digital value and outputs it to the CPU (1).
- CPU (l) is the digital value of the voltage of the signal having the intermediate frequency, the intermediate frequency during the first period when the frequency (Fs) of the RF signal is swept from the initial frequency (Fs 1) to the final frequency (Fsn).
- the digital value of the logarithmic voltage obtained by logarithmically converting the voltage of the signal having the voltage and the digital value of the voltage representing the voltage standing wave ratio are taken from the AZD converter (7).
- An apparatus for measuring the characteristics of a tuner includes a CPU (l), a PLL frequency synthesizer (2), a linear detection means (3), a logarithmic detection means (4), and a VSWR
- a measuring means (5), a first AZD converter (81), a second AZD converter (82), and a third AZD converter (83) may be provided.
- the first AZD converter (81) inputs the voltage of a signal having an intermediate frequency from the linear detection means (3).
- the second AZD converter (82) inputs logarithmic voltage power obtained by logarithmically converting the voltage of a signal having an intermediate frequency from the logarithmic detection means (4).
- the third AZD converter (83) receives a voltage representing the voltage standing wave ratio from the VSWR measurement means (5).
- the CPU (1) sets the digital value of the voltage of the signal having the intermediate frequency to the first frequency during the first period when the frequency (Fs) of the RF signal is swept up to the final frequency (Fsn).
- AZD converter (81) force Captures the digital value of the logarithmic voltage obtained by logarithmically converting the voltage of the signal having the intermediate frequency from the second AZD converter (82), and the digital value of the voltage representing the voltage standing wave ratio is Import from 3 AZD converter (83).
- FIG. 1 shows a functional block diagram of a device for measuring the characteristics of a tuner according to the prior art or the present invention.
- FIG. 2 A flow chart for explaining a method for measuring the characteristics of a tuner according to the prior art.
- FIG. 3 is a diagram for explaining an RF signal having a first frequency (Fsl) to an nth frequency (Fsn) generated by the CPU 1 and the PLL frequency synthesizer 2 in FIG.
- FIG. 5 is a flowchart for explaining a method of measuring the characteristics of a tuner according to the present invention.
- FIG. 6 is a diagram for explaining the timing for taking in measured values for a swept RF signal.
- FIG. 7 is a diagram for explaining the timing for taking in measured values for a swept RF signal.
- FIG. 8 shows a functional block diagram of an apparatus for measuring tuner characteristics according to the present invention.
- FIG. 9 is a flowchart for explaining a method of measuring the characteristics of a tuner according to the present invention.
- FIG. 10 is a diagram for explaining the timing for taking in measured values for a swept RF signal.
- the apparatus for measuring the characteristics of the tuner according to the present invention is similar to the conventional apparatus in that the CPU 1, the PLL frequency synthesizer 2, the linear detection means 3, the logarithmic detection means 4, the VSWR measurement means 5, , Switch 6 and AZD converter 7.
- the operations of the CPU 1 and the switch 6 according to the present invention have different parts from the conventional operations.
- Fig. 5 is a flowchart for explaining a method for measuring the characteristics of a tuner according to the present invention.
- Fig. 6 is a diagram for explaining the timing for taking in measured values for a swept RF signal.
- CPU 1 outputs a control signal for setting a tuning frequency (channel frequency) to a predetermined frequency to tuner 10 (step 501).
- the tuner 10 sets the tuning frequency to a predetermined frequency according to the control signal.
- the tuner 10 further generates a signal having a frequency (local frequency) obtained by adding the tuning frequency and the intermediate frequency.
- the CPU 1 outputs a first control signal for setting the sweep frequency (Fs) to the first frequency (initial frequency) (Fsl) to the PLL frequency synthesizer 2 (step 502).
- the PLL frequency synthesizer 2 generates an RF signal having a first frequency (Fsl) in response to the first control signal, and outputs it to the tuner 10 and the VSWR measuring means 5.
- the tuner 10 receives an RF signal having the first frequency (Fsl) from the PLL frequency synthesizer 2 and outputs a reflected signal of the RF signal to the VSWR measuring means 5.
- the tuner 10 mixes the RF signal having the first frequency (Fsl) and the signal having the local frequency to generate a mixed signal.
- the tuner 10 further filters the mixed signal with a filter corresponding to the intermediate frequency, A signal having an intermediate frequency is generated.
- the tuner 10 outputs a signal having an intermediate frequency to the linear detection means 3 and the logarithmic detection means 4.
- the linear detection means 3 receives a signal having an intermediate frequency from the tuner 10 and detects the voltage of the signal having the intermediate frequency.
- the linear detection means 3 outputs a voltage of a signal having an intermediate frequency to the switch 6.
- the logarithmic detection means 4 receives a signal having an intermediate frequency from the tuner 10 and detects a logarithmic voltage obtained by logarithmically converting the voltage of the signal having the intermediate frequency.
- the linear detection means 3 outputs to the switch 6 a logarithmic voltage obtained by logarithmically converting the voltage of a signal having an intermediate frequency.
- the VSWR measuring means 5 inputs an RF signal having the first frequency (Fsl) from the PLL frequency synthesizer 2, and inputs a reflected signal of the RF signal having the first frequency (Fsl) from the tuner 10. .
- the VSWR measuring means 5 detects a voltage representing a voltage standing wave ratio from the RF signal and its reflection signal.
- the VSWR measuring means 5 switches the voltage representing the voltage standing wave ratio.
- the CPU 1 sets the switch 6, and as a result, the switch 6 inputs the voltage of the signal having the intermediate frequency from the linear detection means 3. Then, it is output to the AZD converter 7 (step 502).
- the AZD converter 7 converts the voltage of a signal having an intermediate frequency into a digital value and outputs it to the CPU 1.
- the CPU 1 captures the digital value from the A / D converter 7 and passes the digital value and the first frequency (Fsl) before a predetermined switch interval ( ⁇ ⁇ ) (for example, 1 ⁇ sec) elapses. ) As the first linear measurement value (step 502).
- the CPU 1 sets the switch 6 again, and as a result, the switch 6 logs the voltage of the signal having the intermediate frequency logarithmically.
- the converted logarithmic voltage is input from the logarithmic detection means 4 and output to the AZD converter 7 (step 502).
- the AZD converter 7 converts a logarithmic voltage obtained by logarithmically converting the voltage of a signal having an intermediate frequency into a digital value and outputs the digital value to the CPU 1.
- CPU1 takes the digital value from AZD converter 7 and sets the digital value and the first frequency (Fsl) to the first logarithmic measurement before the predetermined switch interval ( ⁇ ⁇ ) elapses after setting the switch again. Store as a value (step 502).
- CPU1 sets switch 6 again.
- switch 6 is obtained from the RF signal and its reflection signal.
- a voltage representing the voltage standing wave ratio is input from the VSWR measurement means 5 and output to the AZD comparator 7 (step 502).
- the A / D converter 7 converts the voltage representing the voltage standing wave ratio into a digital value and outputs it to the CPU 1.
- CPU1 takes the digital value from the AZD converter 7 and passes the digital value and the first frequency (Fsl) to the first VSWR before the predetermined switch interval ( ⁇ tt) elapses after setting the switch again.
- the measured value is stored (step 502).
- the CPU 1 sets the switch 6 for each predetermined switch interval ( ⁇ ⁇ ).
- the switch 6 includes the linear detection means 3, the logarithmic detection means 4, and the VSWR measurement means 5. Switch the input of switch 6 in this order (see Figure 6).
- CPU 1 takes in the digital value from A / D converter 7. Therefore, CPU1 captures digital values in the order of linear measurement, logarithmic measurement, and VSWR measurement (see Figure 6).
- the CPU 1 determines whether or not the sweep frequency (Fs) is equal to or smaller than the nth frequency (final frequency) (Fsn) (step 503).
- the second control signal for setting is output to PLL frequency synthesizer 2.
- the PLL frequency synthesizer 2 generates an RF signal having the second frequency (Fs2).
- the tuner 10 outputs the reflected signal of the RF signal having the second frequency to the VSWR measuring means 5.
- the tuner 10 mixes the RF signal having the second frequency and the signal having the local frequency, and generates a signal having the intermediate frequency by a filter corresponding to the intermediate frequency.
- the tuner 10 outputs a signal having an intermediate frequency to the linear detection means 3 and the logarithmic detection means 4.
- step 502 CPU1 takes the digital value from AZD converter 7 after setting the switch and before the predetermined switch interval (Att) elapses, and the digital value and the second frequency (Fs2) are the second linear measurement value. (Step 502).
- CPU1 sets switch 6 again, so that switch 6 is obtained from the RF signal and its reflected signal.
- a voltage representing the voltage standing wave ratio is input from the VSWR measuring means 5 (step 502).
- CPU1 takes the digital value and the second frequency (Fs2) from the second VSWR after setting the switch again and before the predetermined switch interval ( ⁇ ⁇ ) elapses.
- the measured value is stored (step 502).
- step 503 when the sweep frequency (Fs) is not equal to or smaller than the nth frequency (Fsn), the CPU 1 determines that the sweep is completed.
- the PLL frequency synthesizer 2 has the first frequency (Fsl) to the nth frequency.
- the CPU 1 generates an RF signal having (Fsn), and the first linear measurement value to the nth linear measurement value, the first logarithmic measurement value to the nth logarithmic measurement value, and the first VSWR measurement value to The nth VS WR measurement value is stored (step 502).
- the technique for measuring the characteristics of a tuner according to the present invention is as shown in FIG. 3 in order to perform linear measurement, logarithmic measurement, and VSWR measurement for one tuning frequency (channel frequency). You only need to sweep the RF signal once. Therefore, the characteristics of the tuner are measured at high speed, and the time for adjusting or inspecting the tuner is shortened.
- the switch 6 includes the linear detection means 3, the logarithmic detection means 4, and the logarithmic detection means 4. Switch the input of switch 6 in the order of VSWR measuring means 5 (see Fig. 6).
- the switch 6 includes the linear detection means 3 and the logarithmic detection means 4. Switch the input of switch 6 in the order of VS WR measuring means 5 (see Fig. 7).
- the PLL frequency synthesizer 2 generates an RF signal having the first frequency (Fsl) to the nth frequency (Fsn), and the CPU 1 performs the first linear measurement value to the first frequency measurement value.
- the number of measurements is shown in Figure 3 to perform linear, logarithmic and VSWR measurements for a single tuning frequency (channel frequency) of 1Z3 force compared to the first embodiment. It is only necessary to sweep the RF signal once. Therefore, the characteristics of the tuner are measured at high speed, and the time for adjusting or inspecting the tuner is shortened.
- the predetermined switch interval ( ⁇ tt) does not have to be a fixed value! /. That is, the predetermined switch interval (A tt) may change with time. Similarly, the predetermined sweep interval (A ts) may not be a fixed value.
- switch 6 may switch the input of the switch 6 regardless of the order of the linear detection means 3, the logarithmic detection means 4, and the VSWR measurement means 5.
- switch 6 may switch the input of switch 6 in the order of linear detection means 3, logarithmic detection means 4, linear detection means 3, logarithmic detection means 4 and VSWR measurement means 5! / ,.
- FIG. 8 shows the functional block of another device for measuring tuner characteristics according to the present invention.
- FIG. 9 is a flowchart for explaining another method for measuring the characteristics of a tuner according to the present invention
- FIG. 10 shows measured values for a swept RF signal. It is a figure for demonstrating the timing to take in.
- the apparatus of the present invention includes a CPU 1, a PLL frequency synthesizer 2, a linear detection unit 3, a logarithmic detection unit 4, and a VSWR measurement unit 5.
- AZD converters 81, 82, and 83 are examples of AZD converters 81, 82, and 83.
- the CPU 1 of the device of the present invention having no switch outputs the first control signal to the PLL frequency synthesizer 2 and then before a predetermined sweep interval (A ts) (eg, 3 sec) elapses.
- a ts a predetermined sweep interval
- the three digital values are acquired from the A / D converters 81, 82, and 83 almost simultaneously, and the first linear measurement value, the first logarithmic measurement value, and the first VSWR measurement value are stored (step 9 02). 10).
- the PLL frequency synthesizer 2 has the first frequency (Fsl) to the nth frequency.
- the CPU 1 generates an RF signal having (Fsn), and the first linear measurement value to the nth linear measurement value, the first logarithmic measurement value to the nth logarithmic measurement value, and the first VSWR measurement value to The nth VS WR measurement value is stored (step 902).
- the third embodiment is changed, and while the sweep frequency of the RF signal is swept from the first frequency (Fsl) to the nth frequency (Fsn),
- the linear measurement value of h, the first logarithmic measurement value to the jth logarithmic measurement value, and the first VSWR measurement value to the kth VSWR measurement value may be stored in the CPU 1 independently of each other.
- the sweep frequency of the RF signal may be swept while decreasing from the first frequency (Fsi) to the nth frequency (Fsn). That is, the sweep frequency of the RF signal may decrease from the nth frequency (Fsn) to the first frequency (Fsl).
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- Measurement Of Resistance Or Impedance (AREA)
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Abstract
Description
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CN2005800395310A CN101061651B (zh) | 2004-11-18 | 2005-09-29 | 测定调谐器特性的装置 |
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JP2004334185A JP2006148407A (ja) | 2004-11-18 | 2004-11-18 | チューナの特性を測定する装置 |
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KR (1) | KR20070089804A (ja) |
CN (1) | CN101061651B (ja) |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH10115639A (ja) * | 1996-04-24 | 1998-05-06 | Tektronix Inc | シリアル・デジタル測定装置及びケーブル測定方法 |
JPH11167565A (ja) * | 1997-09-30 | 1999-06-22 | Advantest Corp | 高速フーリエ変換装置及びネットワークアナライザ |
JP2002305691A (ja) * | 2001-04-06 | 2002-10-18 | Matsushita Electric Ind Co Ltd | 高周波装置 |
JP2002374167A (ja) * | 2001-06-12 | 2002-12-26 | Nissin Electric Co Ltd | 監視制御のアナログ入力装置 |
Family Cites Families (1)
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JP2001228186A (ja) * | 2000-02-14 | 2001-08-24 | Toko Inc | フィルタの同調周波数測定装置 |
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- 2005-09-29 CN CN2005800395310A patent/CN101061651B/zh not_active Expired - Fee Related
- 2005-09-29 WO PCT/JP2005/017957 patent/WO2006054391A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH10115639A (ja) * | 1996-04-24 | 1998-05-06 | Tektronix Inc | シリアル・デジタル測定装置及びケーブル測定方法 |
JPH11167565A (ja) * | 1997-09-30 | 1999-06-22 | Advantest Corp | 高速フーリエ変換装置及びネットワークアナライザ |
JP2002305691A (ja) * | 2001-04-06 | 2002-10-18 | Matsushita Electric Ind Co Ltd | 高周波装置 |
JP2002374167A (ja) * | 2001-06-12 | 2002-12-26 | Nissin Electric Co Ltd | 監視制御のアナログ入力装置 |
Also Published As
Publication number | Publication date |
---|---|
CN101061651A (zh) | 2007-10-24 |
KR20070089804A (ko) | 2007-09-03 |
TW200635216A (en) | 2006-10-01 |
TWI355140B (ja) | 2011-12-21 |
JP2006148407A (ja) | 2006-06-08 |
CN101061651B (zh) | 2012-02-22 |
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