WO2004095725A1 - 高周波信号レベル検出装置及びそれを用いた高周波信号受信装置 - Google Patents
高周波信号レベル検出装置及びそれを用いた高周波信号受信装置 Download PDFInfo
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- WO2004095725A1 WO2004095725A1 PCT/JP2004/005707 JP2004005707W WO2004095725A1 WO 2004095725 A1 WO2004095725 A1 WO 2004095725A1 JP 2004005707 W JP2004005707 W JP 2004005707W WO 2004095725 A1 WO2004095725 A1 WO 2004095725A1
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- signal level
- frequency signal
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
- H03G3/3068—Circuits generating control signals for both R.F. and I.F. stages
Definitions
- the present invention relates to a high frequency signal level detection device for detecting the signal level of a high frequency signal received by an antenna or a cable, and a high frequency signal reception device using the same.
- Patent Application Publication No. 60-062246 (hereinafter referred to as prior art document)
- the signal level is detected based on the A G C voltage which is the control voltage output from the circuit.
- the device of the prior art in order to reduce the display error of the input level display generated due to the difference of the reception frequency, For signals of a predetermined frequency or more at which the change in AGC value becomes large, the AGC value is corrected by a predetermined value to create a mapping function and stored in the memory, and the reception frequency when displaying the input level When the frequency exceeds the specified frequency, the AGC voltage is corrected by a predetermined value, and then the mapping The display level value of the input signal is calculated by the number. Disclosure of the invention
- the frequency range is finely divided and the mapping function data is stored for each frequency range.
- the accuracy may be insufficient.
- the signal level is calculated based only on the relationship between the signal level and the RF AGC voltage, so that the display accuracy of the signal level may be degraded. . Furthermore, when there is an interference wave in an adjacent channel, there is a problem that the RF AGC voltage is affected by the interference wave and the display accuracy of the signal level is lowered.
- An object of the present invention is to solve the above problems and provide a high frequency signal level detection device capable of detecting the signal level of a high frequency signal with high accuracy compared to the prior art, and a high frequency signal reception device using the same. It is to do.
- the high frequency signal level detection device is characterized in that the high frequency signal is detected such that the output level of the intermediate frequency signal becomes substantially constant based on the intermediate frequency signal after frequency conversion of the received high frequency signal.
- AGC circuit that performs automatic gain control of the intermediate frequency signal using the RF AG C value for controlling the gain of the signal and the IF AG C value for controlling the gain of the intermediate frequency signal,
- the first relation data of the RF AG C value with respect to the input signal level of the received high frequency signal, and the second relation data of the IF AG C value with respect to the input signal level of the received high frequency signal are previously obtained.
- detecting means for detecting an input signal level of the received high frequency signal using data are previously obtained.
- the detection means When the gain for the target is a maximum value, the input signal level of the received high frequency signal is detected using only the second relation data based on the measured IF AG C value. .
- the detection means uses only the first relationship data based on the measured RF AGC value. It is characterized in that an input signal level of the received high frequency signal is detected.
- the detection means may use the first relationship data measured based on the measured RFAGC value to use a first input of the received high frequency signal. Detecting a signal level, detecting the second input signal level of the received high frequency signal using the measured second relation data based on the measured IFAGC value; An average value of the detected first input signal level and the detected second input signal level is detected as an input signal level of the received high frequency signal.
- the received high frequency signal has a plurality of frequencies
- the detection means uses a high frequency signal having a substantially central frequency among the plurality of frequencies to generate first relation data of an RF AGC value to an input signal level, and an IF AG Cc to the input signal level.
- a second relationship data of values is measured in advance.
- the received high frequency signal has a plurality of frequencies
- the detection means uses two high frequency signals each having the highest frequency and the lowest frequency among the plurality of frequencies.
- the input signal level of the detected high frequency signal having the highest frequency and the input signal level of the high frequency signal having the lowest frequency is determined with respect to the reception frequency of the high frequency signal to be measured.
- a linear approximation method for linear approximation is used to calculate an input signal level of the high frequency signal to be measured.
- the received high frequency signal has a plurality of frequencies
- the detection means measures, in advance, the first and second relationship data in each of the divided frequency ranges, in a frequency range to which the frequency of the high frequency signal to be measured belongs.
- the input signal level of the received high frequency signal is detected using the corresponding measured first and second relation data.
- the detection means is between an interference wave of another high frequency signal and a absence of the interference wave near the frequency of the high frequency signal to be measured.
- the third relation data which is a detection error for the IF AG C value in the second relation data of the IF AG C value with respect to the input signal level of the received high frequency signal, is measured in advance, and the high frequency signal to be measured is The detection error is detected using the third relationship data on the basis of the measured value IF AG C, and the detected error is used to detect the detected input signal level. To make corrections.
- the detection means may be configured to:
- the received high frequency signal is In the second relation data of IF AG C value with respect to the input signal level, the second detection error as the second detection error with respect to the IF AGC value and the second part of the third relation data are measured in advance. Based on the IF AG C value measured for the signal, the first of the third relationship data corresponding to the state in which the high frequency signal to be measured is the first case or the second case. Using the part or the second part to detect the first or second detection error, and correcting the detected input signal level using the detected detection error. Do.
- the detection means represents the first relation data and the second relation data as predetermined approximation functions, and an approximation function of the first relation data.
- the input signal level of the received high frequency signal is detected using an approximation function of the second relation data.
- the high frequency signal level detection device is characterized by further comprising display means for displaying the input signal level detected by the detection means.
- Another high frequency signal receiving apparatus comprises a receiver for receiving a high frequency signal, converting the frequency of the received high frequency signal into an intermediate frequency signal and outputting the intermediate frequency signal, and the high frequency signal level detection apparatus. It features.
- the first relation data of the RFAGC value with respect to the input signal level of the received high frequency signal, and the second relation data of the IFAGC value with respect to the input signal level of the received high frequency signal Measure and measure RF AG C value and IF AG C value when the high frequency signal to be measured is received, and based on the measured RF AGC value and IF AG C value, measure the above first and second measured values.
- the relationship data of 2 is used to detect the input signal level of the received high frequency signal. Therefore, the signal level of the high frequency signal can be detected with high accuracy as compared with the prior art.
- FIG. 1 is a block diagram showing a configuration of a television receiver 100 having a high frequency signal level detection and display function according to a first embodiment of the present invention.
- FIG. 2 is a block diagram showing a configuration of a measurement control system for generating a display control program for the high frequency signal level detection and display function of the television receiver 100 of FIG.
- FIG. 3 is a diagram showing an example of the channel arrangement of the broadcast signal of cable television in the United States.
- FIG. 4 is a flowchart showing a display control program generation process executed by the controller 60 of the measurement control system of FIG.
- FIG. 5 is a flowchart showing a display control process performed by the controller 50 of FIG.
- FIG. 6 shows the relationship between R and the input signal level in the television receiver 100 of FIG.
- Figure 7 shows the measurement results of the relationship of the input signal level to the RF AG C register value of Figure 6. It is a graph which shows an approximation function when the result is approximated using a predetermined approximation function.
- FIG. 8 is a graph showing an approximation function when the measurement result of the relationship of the input signal level to the I FAGC register value of FIG. 6 is approximated using a predetermined approximation function.
- FIG. 9 is a diagram showing a frequency range FR1, FR2 divided into two, which is used in the television receiver 100 according to the second embodiment of the present invention.
- FIG. 10 is a flowchart showing a display control program generation process executed by the controller 60 of the measurement control system according to the second embodiment.
- FIG. 11 is a flowchart showing display control processing executed by the controller 50 according to the second embodiment.
- FIG. 12 is used in the television receiver 100 according to a third embodiment of the present invention, the lowest frequency f lmi n in each frequency range is divided into two FR 1, FR 2, f 2min and the highest frequency f lmax, f it is a diagram illustrating a 2max and receive frequencies f rec.
- FIG. 13 is a flowchart showing a first portion of a display control program generation process executed by the controller 60 of the measurement control system according to the third embodiment.
- FIG. 14 is a flowchart showing a second part of the display control program generation process executed by the controller 60 of the measurement control system according to the third embodiment.
- FIG. 15 is a flowchart showing a display control process performed by the controller 50 according to the third embodiment.
- FIG. 16 is a flowchart showing a display control program generation process executed by the controller 60 of the measurement control system according to the fourth embodiment.
- FIG. 17 is a flowchart showing display control processing executed by the controller 50 according to the fourth embodiment.
- FIG. 18 is a graph showing an approximate function A F 52 when the measurement result of the relationship between the input signal level above the predetermined threshold value and the RFAGC register value is approximated using a predetermined approximation function.
- Figure 19 shows the input signal level below the predetermined threshold for the I FAGC register value. It is a graph which shows approximation function AF51 when the measurement result of Bell's relationship is approximated using a predetermined approximation function.
- FIG. 20 is a flowchart showing a first portion of a display control program generation process executed by the controller 60 of the measurement control system according to the fifth embodiment.
- FIG. 21 is a flowchart showing a second part of the display control program generation process executed by the controller 60 of the measurement control system according to the fifth embodiment.
- FIG. 22 is a flowchart showing a display control process performed by the controller 50 according to the fifth embodiment.
- FIG. 23 is a flowchart showing a first part of a display control program generation process executed by the controller 60 of the measurement control system according to the sixth embodiment.
- FIG. 24 is a flowchart showing a second part of the display control program generation process executed by the controller 60 of the measurement control system according to the sixth embodiment.
- FIG. 25 is a flowchart showing display control processing performed by the controller 50 according to the sixth embodiment.
- FIG. 26 is a spectrum diagram showing a case where interference waves of two adjacent channels are present on both sides of the reception channel in the television receiver 100 according to the seventh embodiment.
- FIG. 27 shows the case where there is no interference wave of the adjacent channel, the case where there is one interference wave, and the two interference waves.
- FIG. 16 is a graph showing IF AG C register values and RF AG C registers with respect to input signal levels in a certain case.
- FIG. 28 is a graph showing the IF AGC register value with respect to the ratio (U / D) of interference wave power to desired wave power in the television receiver 100 according to the seventh embodiment.
- FIG. 29 is a graph showing the display error ER 2 of the input signal level with respect to the IFA GC register value in the television receiver 100 according to the seventh embodiment.
- FIG. 30 is a flowchart showing characteristic parts of the display control process performed by the controller 50 according to the seventh embodiment.
- FIG. 1 is a block diagram showing a configuration of a television receiver 100 provided with a high frequency signal level detection and display function according to a first embodiment of the present invention.
- FIG. 2 is a block diagram showing a configuration of a measurement control system for generating a display control program for the high frequency signal level detection and display function of the television receiver 100 of FIG.
- the television receiver 100 is, for example, a set top box for receiving a digital broadcast signal of cable television (hereinafter referred to as "CATV") (for video signal processing up to RGB switch 17 in FIG.
- CATV digital broadcast signal of cable television
- the processing is a high-frequency signal receiver including the portion up to the low-frequency amplifier 20 of FIG. 1, and controls the attenuation amount of the attenuator 4 so as to keep the signal level of high frequency (RF) substantially constant.
- an AGC circuit 30 for generating an IFAGC voltage for controlling the amplification degree of the intermediate frequency amplifier 7 so as to keep the signal level of the intermediate frequency (IF) substantially constant.
- the controller 60 of the measurement control system controls the high frequency signal generator 65 to change the input signal level of the high frequency signal input to the input terminal 1 as shown in FIG.
- the approximate functions AF1 and AF2 are respectively calculated based on the relationship between the IF AGC register value and the RF AGC register value, and a display control program (FIG. 5) including these approximate functions AF1 and AF2 is generated.
- Writing to program memory 51 in controller 50 is a special feature.
- the controller 50 of the television receiver 100 actually views the broadcast signal by executing the display control program of FIG.
- the input signal level P if is calculated using the approximation function AF 1 based on the IF AG C register value, and the approximation function AF 2 is used based on the RF AG C register value, the input signal level P rf is calculated. The average value of these is calculated and displayed as an input signal level P.sub.in.
- the input terminal 1 is connected to a broadcaster's head end device of CATV, for example, via a coaxial cable.
- the front end circuit 2 includes a high frequency amplifier 3, an attenuator 4 whose attenuation is controlled by an RF AGC voltage outputted from a low pass filter (LPF) 4 5 in the AGC circuit 30, and the television A local oscillator 5 whose local oscillation frequency is controlled by a controller 50 and a mixer 6 are configured to control the frequency of the broadcast channel of the television receiver 100.
- the digital broadcast signal from the head end device is input to the mixer 6 via the input terminal 1, the high frequency amplifier 3 and the attenuator 4.
- the local oscillation signal from the local oscillator 5 is input to the mixer 6.
- the mixer 6 mixes the two input signals, and outputs the mixed signal to the AZD converter 10 via the intermediate frequency amplifier 7, the S AW band pass filter 8 and the intermediate frequency amplifier 9.
- the SAW band-pass filter 8 substantially passes only the signal component of one channel of the broadcast signal, thereby corresponding to the signal component of one channel of the broadcast signal from the mixed signal.
- Extract low frequency converted intermediate frequency signal hereinafter referred to as IF signal.
- the A / D converter 10 AZD converts the input IF signal into a digital signal at a predetermined sampling frequency and has an RF-IF control function in the digital demodulator 1 1 and AGC circuit 30. Output to AGC detection circuit 3 1.
- the digital demodulator 1 1 includes an error correction circuit, digitally demodulates the input digital signal, and outputs it to the TS decoder 1 2.
- the TS decoder 12 sends the digitally demodulated digital signal that has been input to the descrambler 14 via the IC power unit 13 that stores the security information of the broadcaster, and the digital signal is digitally demodulated. Descrambling the signal and de-scramble the digital signal after Sport 'stream signal (hereinafter referred to as TS signal) is extracted and output to the AV decoder 15.
- TS signal Descrambling the signal and de-scramble the digital signal after Sport 'stream signal
- the AV decoder 15 decodes a digital video signal and a digital audio signal from the input TS signal, and outputs the digital video signal to the RGB processor 16 and outputs the digital audio signal to the low frequency amplifier 20.
- the RGB processor 16 converts the input digital video signal into an RGB video signal and
- the RGB switch 17 generates the RGB signal generated by the On Screen Display (OS D) controller 19 based on the data of the input signal reservoir of the broadcast signal from the controller 50, as will be described in detail later.
- the signal is superimposed on the RGB signal from the processor 16 and output to the liquid crystal display 18.
- the low frequency amplifier 20 includes an A / D converter, A / D converts the input two-channel digital audio signal into an analog audio signal, and outputs it to the left and right speech powers 22 and 21.
- the AGC circuit 30 includes an AGC detection circuit 31 including an RF-IF control function, loop qualifiers 32, 42, IFAGC register 32, RFAGC register 42, pulse width modulators 34, 44, low pass It is configured to include filters 35 and 45.
- the AGC detection circuit 31 is a broadcast signal input at various input signal levels depending on the reception location and reception channel (for example, about 90 dB difference in input signal level when receiving a terrestrial digital broadcast signal, in the case of a digital cable). Has an input signal level difference of about 30 dB) input from the AZD converter 10 in order to adjust it to a substantially constant amplitude level that will allow the downstream digital demodulator 1 1 to properly demodulate.
- the RFAGC loop is generated.
- a GC detection circuit The I FAGC signal of 31 forces is time-averaged by a predetermined low pass filter, loop filter 32, and then the signal value is temporarily stored in I FAGC register 33, and the pulse width is further added.
- the modulator 34 modulates the pulse width according to the I FAGC register value stored in the I FAGC register 33 using, for example, the ⁇ - ⁇ modulation method, and the pulse width modulated I FAGC signal passes through the band pass filter 35.
- the RFAGC signal from the AGC detection circuit 31 is time-averaged by the loop filter 42 which is a predetermined low pass filter, and the signal value is temporarily stored in the RFAGC register 43.
- 44 modulates the pulse width according to the RFAGC register value stored in the RFAGC register 43 using, for example, the ⁇ - ⁇ modulation method, and the pulse width modulated IF AGC signal becomes the RFAGC voltage through the band pass filter 45.
- the IF AG C register value and the RF AGC register value stored in the IF AG C register 33 and the RF AGC register 43, respectively, are read from the controller 50 power, and generate the approximate functions AF 1 and AF 2 described later in detail. And used to calculate the input signal level Pin.
- the controller 50 is formed of, for example, a microcomputer, and controls the entire television receiver 100 in accordance with a program stored in the program memory 51, and stores data temporarily calculated when the program is executed in the data memory 52. Do.
- the controller 50 is connected to an input device 53 for inputting a channel number for selecting a broadcast channel, an instruction to display an input signal level, and the like, and for displaying an input value or setting value to the controller 50.
- the liquid crystal display 54 is connected.
- the controller 50 calculates the input signal level of the digital broadcast signal to be viewed by executing the display control program generated by the controller 60 of FIG. 2 and stored in the program memory 51. Display.
- the high frequency signal generator 65 is connected to the input terminal 1 of the television receiver 100, and the controller 60 controls the frequency of the high frequency signal generated from the high frequency signal generator 65.
- the controller 60 is composed of, for example, a microcomputer and controls the entire measurement control system according to a program stored in the program memory 61, and data calculated temporarily at the time of execution of the program is stored in the data memory 62. Store.
- the controller 60 An input device 63 for inputting a generation instruction of a display control program and the like is connected, and a liquid crystal display 64 for displaying input values and set values to the controller 60 and an operation state is connected.
- the controller 60 controls the high frequency signal generator 65 to execute the input terminal 1 by executing the display control program generation process of FIG.
- FIG. 3 is a diagram showing an example of the channel arrangement of CATV broadcast signals in the United States.
- the channel of the CATV broadcast signals in the United States from 57 MHz broadcast signal of the second channel, through the broadcast signal of 459m H z of the 63 channels, of 861 MH z the 135th channel It includes up to the broadcast signal.
- FIG. 4 is a flowchart showing a display control program generation process executed by the controller 60 of the measurement control system of FIG.
- step S1 the high frequency signal generator 65 is controlled to be input to the input terminal 1.
- the input signal level of a high frequency signal having an approximate center frequency of 459 MHz is
- the I FAGC register value and the RFAGC register value for each input signal level are read from the I FAGC register 33 and the RF AGC register 43 respectively and stored in the data memory 62 while changing every 1 d BmV to B mV.
- step S2 an approximation function AF1 of the relationship is calculated based on data indicating the relationship of the IFAGC register value to each input signal level
- step S3 the RFAGC register value for each input signal level is calculated. Calculate an approximate function AF 2 of the relationship based on data indicating the relationship.
- step S4 a display control program (FIG. 5) including the calculated approximate functions AF 1 and AF 2 is generated to The program is written to the gram memory 51, and the display control program generation process is ended.
- the form of the approximation function and the calculation method thereof are the same as in the other embodiments described later.
- FIG. 5 is a flowchart showing display control processing performed by the controller 50 of FIG.
- step SI1 it is determined whether or not the input signal level display instruction is input from the input device 53. If YES, the process proceeds to step S12, and if NO, step S11 Return to Next, in step S12, the I FAGC register value is read from the I FAGC register 33, and the RF AGGC register value is read from the RFAG C register 43.
- step S13 the input signal level P if is calculated using the approximation function AF 1 based on the read I FAGC register value, and in step S 14 based on the read RFAGC register value.
- the input signal level P rf is calculated using the approximation function AF 2. Further, in step S15, based on the calculated input signal levels P ⁇ P and P r f, their average value is calculated as an input signal level P in using the following equation (1).
- step S16 display data for displaying the calculated input signal level P in is generated and output to the OSD controller 19, and the process goes to step S11.
- FIG. 6 is a graph showing an example of measurement results of RFAGC register values and IFAGC register values with respect to input signal levels in the television receiver 100 of FIG.
- the attenuation amount of attenuator 4 is minimum and the RF gain is set to maximum until the input signal level is about 1 to 6 dBmV.
- the input signal level which is substantially constant, gradually decreases when it exceeds about 16 dBmV.
- the I FA GC register value increases, the input signal level It gradually decreases up to 6 d BmV, but has a characteristic that becomes almost constant when the input signal level exceeds approximately 16 d BmV.
- FIG. 7 is a graph showing an approximation function AF 2 when the measurement result of the relationship of the input signal level to the RF AGC register value of FIG. 6 is approximated using a predetermined approximation function.
- the input signal level is from 1 dBm to 10 dBm.
- FIG. 8 is a graph showing an approximation function AF1 when the measurement result of the relationship between the input signal level and the I F AG C register value of FIG. 6 is approximated using a predetermined approximation function. As apparent from FIG. 8, although a slight error occurs when the input signal level is in the range of 10 d BmV to 0 d BmV, the other part is approximately the approximate function A along the measured value.
- the approximation function AF 1 is used based on the IF AGC register value.
- the input signal level P i ⁇ calculates the input signal level P rf using the approximation function AF 2 based on the RFAGC register value, and calculates and displays the average value thereof as the input signal level P in Therefore, the errors in FIGS. 7 and 8 described above can be averaged, and the input signal level of the received broadcast signal can be detected and displayed with high accuracy as compared with the prior art.
- FIG. 9 is a diagram showing a frequency range FR1, FR2 divided into two, which is used in the television receiver 100 according to the second embodiment of the present invention.
- the frequency range of the channel is divided into a first frequency range FR 1 and a second frequency range FR 2 as shown in FIG. 9, and the input signal level at the approximate center frequency f lc of the first frequency range FR 1 Approximate function AF 1 in relation to I FAGC register value
- FIG. 10 is a flowchart showing a display control program generation process executed by the controller 60 of the measurement control system according to the second embodiment.
- the I FAGC register value and the RF AG C register value for each input signal level are respectively changed by I AG C register 33 and R FAGC register 43 by changing the input signal level of each 20 d BmV to +20 0 dBmV every 1 d BmV. , And stored in the data memory 62.
- the I FAGC register value and the RFAGC register value for each input signal label are read from the I FAGC register 33 and the RF AG C register 43 by changing the level from 20 20 d BmV to +20 dBmV every 1 dBmV.
- an approximation function AF11 of the relationship is calculated based on data indicating the relationship of the I FAGC register value to each input signal level in the first frequency range FR1, and in step S24.
- the approximation function AF12 of the relationship is calculated based on data indicating the relationship of the RF AG C register value to each input signal level of the first frequency range FR1. Furthermore, in step S 25, an approximate function AF 21 of the relationship is calculated based on data indicating the relationship between the IF AGC register value and each input signal level in the second frequency range FR 2, and step S 26. In the second frequency range FR 2 on the basis of data indicating the relationship between the RFAGC register value and the signal level of each. Calculate the relevant approximation function AF 22. Further, in step S27, a display control program (FIG. 11) including the respective approximate functions AF11, AF12, AF21, and AF22 calculated as described above is generated and written to the program memory 51 in the controller 50. End the display control program generation process.
- FIG. 11 is a flowchart showing display control processing executed by the controller 50 according to the second embodiment.
- step S31 it is determined whether or not an input signal level display instruction is input from the input device 53.
- step S32 the I FAGC register value is read from the I FAGC register 33, and the RF AGC register value is read from the RF AGC register 43.
- step S33 it is determined whether or not the current reception frequency f rec is within the first frequency range FR 1 and, if YES, the process proceeds to step S34, while if NO, Proceed to step S36.
- step S 34 based on the read I FAGC register value, the input signal level P if is calculated using the approximation function AF 11, and in step S 35, based on the read RFAGC register value.
- the input signal level P rf is calculated using the approximation function AF12, and the process proceeds to step S38.
- step S36 based on the read I FAGC register value, the input signal level P if is calculated using the approximation function AF 21.
- step S37 the read RFAGC register value is calculated. Using the approximate function AF 22 based on
- step S 38 based on the calculated input signal levels P if and P rf, their average value is calculated as the input signal level P in using equation (1), and in step S 39, The display data for displaying the input signal level P in thus generated is generated and output to the OS D controller 19, and the process returns to step S31.
- the digital broadcast signal when viewing a digital broadcast signal, the digital broadcast signal being viewed based on the IF AGC register value In the frequency range of FR 1 or FR 2
- the input signal level P if is calculated using the corresponding approximation function AF 11 or AF 21, and the frequency range included in the frequency of the digital broadcast signal being viewed based on the RF AG C register value.
- the frequency range of the broadcast signal is divided into two frequency ranges FR 1 and FR 2.
- the approximation function may be calculated by dividing into three or more frequency ranges. . The same applies to the embodiments described later.
- the ⁇ used in the television receiver 100 according to the third embodiment the lowest frequency f lmi n in each frequency range is divided into two FR 1, FR2, f 2min and the highest frequency f lmax, f it is a diagram illustrating a 2max and receive frequencies f rec.
- the third embodiment when detecting the input signal level of the digital broadcast signal, it is noted that the characteristics of FIG. 6 change according to the frequency of the broadcast signal, and all channels of the CATV broadcast signal are detected.
- the frequency range is divided into two, the first frequency range FR 1 and the second frequency range FR 2 as shown in FIG.
- rec rec is the reception frequency
- n is 1 in the first frequency range FR 1
- FIGS. 13 and 14 are flowcharts showing display control program generation processing executed by the controller 60 of the measurement control system according to the third embodiment.
- the I FAGC register value and the RF AG C register value for each input signal level are read out from the I FAGC register 33 and the RF A GC register 43 respectively by changing the value from 1 20 dBmV to +20 dB mv every 1 d BmV Store in 62.
- step S42 the high frequency signal generator 65 is controlled to input the maximum frequency f lmax of the first frequency range FR 1 and the minimum frequency f 2 min of the second frequency range FR 2 to be input to the input terminal 1
- the input signal level of the high-frequency signal having 459 MHz is changed every 20 dBmV to +20 dBmV every 1 dBmV, and the I FAGC register value and R FAGC register value for each input signal level are respectively changed to I FAGC register
- the data is read from the register 33 and RFAG C register 43 and stored in the data memory 62.
- the I AG C register value and the RF A G C register value for each input signal level are read from the I FAG C register 33 and the RF AGC register 43 and stored in the data memory 62 by changing I Id BmV to 20 d BmV.
- step S44 an approximation function AF31 a of the relationship is calculated based on data indicating the relationship between the IF AGC register value and each input signal lever in the minimum frequency f lmin of the first frequency range FR1.
- step S 45 to calculate an approximate function AF 31 b of the relation based on the data indicating the relationship between the RFAGC register value for each input signal level at the minimum frequency f ra i n the first frequency range FR1, Proceed to step S46 in FIG.
- step S46 of FIG. 14 the relationship of the IF AG C register value to each input signal level at the maximum frequency f 1 max of the first frequency range FR 1 and the minimum frequency f 2 min of the second frequency range FR 2 is calculated.
- the approximate function AF32 a AF41 a of the relationship is calculated based on the data shown, and in step S47, the maximum frequency f lmax of the first frequency range FR 1 and the minimum frequency of the second frequency range FR 2 ⁇ 2 m
- step S 48 the approximate function AF 42 a of the relation calculated on the basis of data showing the relationship between IF AG C register value for each input signal level that put the maximum frequency f 2max of the second frequency range FR2 in step S 49, to calculate an approximate function AF 42 b of the relationship on the basis of data showing the relationship RFA GC register values for each input signal level at the maximum frequency f 2ma x of the second frequency range FR 2.
- Display control program (Fig. 15) including 2 a, AF 42 b and controller
- the program memory 51 in 50 is written, and the display control program generation process is ended.
- FIG. 15 is a flowchart showing display control processing executed by the controller 50 according to the third embodiment.
- step S51 it is determined whether or not the input signal level display instruction is input from the input device 53. If YES, the process proceeds to step S52, while if NO, step S51. Go back to 51 In step S 52, the IF AG C register value is read out from the IF AG C register 33, and the RF AGC register value is read out from the RFAGC register 43. Next, in step S53, it is determined whether the current reception frequency f rec is in the first frequency range FR 1 or not. If YES, the process proceeds to step S54, and if NO, the process proceeds to step S56. move on.
- step S 54 based on the read I FAGC register value, the input signal level P if at the minimum frequency f lmin is calculated using the approximate function AF 31 a and the read RFAGC register value is read.
- step S55 based on the read I FAGC register value, an approximation function AF
- step S 58 based on the calculated input signal levels P imin and P f max , the input signal level P in is calculated using the equation (2) by the linear approximation method, and in step S 59 After the display data for displaying the input signal level P in thus generated is generated and output to the OSD controller 19, the process returns to step S51.
- the digital broadcast signal being viewed based on the IF AGC register value is The input signal level P i ⁇ is calculated using the approximation function at the lowest frequency in the frequency range FR 1 or FR 2 included in the frequency, and the frequency of the digital broadcast signal being viewed is calculated based on the RF AG C register value.
- the input signal level P rf is calculated using the approximation function at the lowest frequency in the frequency range FR 1 or FR 2 included, the average value of these is calculated as the input signal level P f min of the lowest frequency, and the IF AGC register Calculate the input signal level P if using the approximation function at the highest frequency in the frequency range FR 1 or FR 2 included in the frequency of the digital broadcast signal being viewed based on the value , RFAGC register value to the input signal level using an approximate function at the highest frequency in the frequency range FR 1 or FR 2 included in the frequency of the digital broadcast signal is viewing based
- the P rf calculated calculates the average value thereof as the input signal level P fmin minimum frequency, the input signal level P imin of the lowest frequency of the frequency range, the input signal level of the highest frequency of the frequency range P fma X
- the input signal level P in is calculated and displayed using the equation (2) according to the linear approximation method. Therefore, while averaging the errors shown in FIGS. 7 and 8 described above, it is possible to correct the error due to the change of the frequency of the broadcast signal in consideration of the frequency deviation from the lowest frequency and the highest frequency, and the received broadcast
- the signal input signal level is detected and displayed with high accuracy compared to the prior art.
- FIG. 16 is a flowchart showing a display control program generation process executed by the controller 60 of the measurement control system according to the fourth embodiment.
- FIG. 17 is a flowchart showing a display control process performed by the controller 50 according to the fourth embodiment.
- the maximum value of the measured RFAGC register value is retrieved, and when the RFAGC register value has the maximum value (when the attenuation of attenuator 4 in FIG. 1 is the minimum value, the gain for the high frequency signal is obtained).
- Searches the range of the input signal level of when the value is the maximum value sets the range as the first level range LR1, and the range of the input signal level when the RF AG C register value does not have the maximum value is the second Assuming that the level range LR2 and the first level range LR1, the input signal level P i ⁇ is calculated using the approximation function AF 51 of the range LR 1 based on the I FAGC register value, while the second level RF in the range LR 2
- the input signal level P in is calculated using the approximate function A F 52 of the range LR 2 based on the AGC register value.
- step S 61 the high frequency signal generator 65 is controlled to set the input signal level of the high frequency signal to be input to the input terminal 1 from 20 dBmV to +20 dBmV 1
- the I FAGC register value and the R FAGC register value for each input signal level are measured and stored in the data memory 62 while changing every dBmV.
- step S 62 the maximum value of the RF AG C register value is retrieved based on the measured RF AG C register value.
- Data memory 62 is stored, and the range of the input signal level when the RF AG C register value has the maximum value is searched, and the range is set to the first level range LR 1 and the RFAG C register value does not have the maximum value.
- step S 63 The range of the input signal level at that time is set to a second level range LR2.
- step S 64 the approximate function AF 51 of the relation calculated on the basis of data showing the relationship between IF AG C register value for each input signal level of the first level range LR1
- step S64 the second An approximate function AF 52 of the relationship is calculated based on data indicating the relationship of the RF AG C register value to each input signal level of the level range LR 2.
- step S 65 the display control program (FIG. 17) including the calculated approximate functions AF 51 and AF 52 is generated and written to the program memory 51 in the controller 50, and the display control program generation process is ended. Do.
- step S71 it is determined in step S71 whether or not an instruction to display the input signal level is input from the input device 53.
- the process proceeds to step S72, while when NO Return to step S71.
- step S 72 read the value of I FAGC register from I FAGC register 33, and
- step S73 Read out the RFAGC register value from the AGC register 43. Then, in step S73, it is determined whether the read RFAGC register value is the maximum value of the RFAGC register value. If YES, the process proceeds to step S74, while if NO, the process proceeds to step S75. move on.
- step S 74 based on the read I FA GC register value, after calculating the input signal level P in using the approximation function A F 51, the process proceeds to step S 76.
- step S75 the input signal level P in is calculated using the approximation function AF 52 based on the read RFAGC register value, and then the process proceeds to step S76. Furthermore, in step S 76, display data for displaying the calculated input signal level P in is generated and output to the OS D controller 19, and the process returns to step S 71.
- FIG. 18 is a graph showing an approximation function AF 52 obtained by approximating the measurement result of the relationship of the input signal level above the predetermined threshold value with respect to the RFAGC register using the predetermined approximation function.
- Figure 19 shows that for the I FAGC register values, It is a graph which shows approximation function AF51 when the measurement result of the relationship of the input signal level below a threshold value is approximated using a predetermined
- the input signal level can be uniquely detected from the RFAGC register value and the IFAGC register value. This is due to the following reasons.
- the input signal level is not divided in step S73 of FIG. 17, it is apparent from the graphs of FIG.
- FIGS. 20 and 21 are flowcharts showing a display control program generation process executed by the controller 60 of the measurement control system according to the fifth embodiment.
- FIG. 22 is a flowchart showing a display control process performed by the controller 50 according to the fifth embodiment.
- the fifth embodiment is characterized in that, in addition to the condition division of the input signal level according to the fourth embodiment, calculation of an approximation function by division of the frequency range according to the second embodiment is used.
- the I FAGC register value and the RFAGC register value for each input signal level are respectively changed by changing the input signal level of the high frequency signal having 1 k every 1 d BmV from 20 d BmV to + 20 d BmV.
- the data is read from the I FAGC register 33 and the RF AGC register 43 and stored in the data memory 62. Then, in step S 82, based on the RF AG C register value measured for the first frequency range FR 1, the maximum value of the RF AG C register value is determined. The large value is retrieved and stored in the data memory 62, and the range of the input signal level when the RF AG C register value has the maximum value is retrieved, and the range is defined as the level range LR11 of the first frequency range FR 1. The range of the input signal level when the value of the RF AG C register value does not have the maximum value is the level range LR 12 of the first frequency range FR 1.
- the value of the IF AG C register value and the RF AG C register value for each input signal level are read from the IF AG C register 33 and the RF AG C register 43 respectively by changing the value of the signal from 20 d BmV to +20 dBmV every 1 d BmV
- the data is stored in the data memory 62, and the process proceeds to step S86 in FIG.
- the maximum value of the RF AG C register value is retrieved based on the RF AG C register value measured for the second frequency range FR 2 and stored in the data memory 62.
- the range of the input signal level when the register value has the maximum value is searched, and the range is set as the second frequency range FR 2 level range LR 21 and the input when the RF AG C register value does not have the maximum value.
- Let the range of signal levels be a second frequency range FR 2 and a reverberation range LR 22.
- step S 87 an approximate function AF 71 of the relationship is calculated based on data indicating the relationship of the IF AGC register value to each input signal level of the level range LR 21, and in step S 88, the level range LR The approximation function AF 72 of the relationship is calculated based on data indicating the relationship of the RF A GC register value to each of the 22 input signal level registers. Further, in step S 89, a display control program (FIG. 22) including the calculated approximate functions AF 61, AF 62, AF 71, AF 72 is generated and written to the program memory 51 in the controller 50. Terminate the process of generating
- step S 91 it is determined whether or not an input signal level display instruction has been input from the input device 53. If YES, then the process proceeds to step S 92, while if NO. The process returns to step S91.
- step S92 the I FAGC register value is read from I FAGC register 33, and the R FAGC register value is read from R FAGC register 43, and in step S 93, the current reception frequency is in the first frequency range. Whether or not it is FR 1 is determined, and if YES, the process proceeds to step S 94, while if NO, the process proceeds to step S 97.
- step S94 it is determined whether the read R FAGC register value is the maximum value of the R FAGC register value.
- the process proceeds to step S95, while when NO, step S94. Proceed to 96.
- step S95 based on the read I FAGC register value, the input signal level P in is calculated using the approximation function AF 61, and the process proceeds to step S100.
- step S 96 based on the read RFAGC register value, the input signal level P in is calculated using the approximation function AF 62, and the process proceeds to step S 100.
- step S 97 it is determined whether the read R FAGC register value is the maximum value of the RF A G C register values, and in the case of Y E S, step S 97
- step S 99 based on the read I FAGC register value, the input signal level P in is calculated using the approximation function A F 71, and the process proceeds to step S 100.
- step S 99 based on the read RFAGC register value, the input signal level ⁇ ⁇ ⁇ in is calculated using the approximation function AF 72, and the process proceeds to step S 100.
- step S 100 based on the read RFAGC register value, the input signal level ⁇ ⁇ ⁇ in is calculated using the approximation function AF 72, and the process proceeds to step S 100.
- display data for displaying the calculated input signal level Pin is generated and output to the OSD controller 19, and the process returns to step S91.
- FIGS. 23 and 24 show a display control program generation process executed by the controller 60 of the measurement control system according to the sixth embodiment.
- FIG. 25 is a flowchart showing a display control process performed by the controller 50 according to the sixth embodiment.
- the input signal level is detected based on the condition division based on whether the RF AG register value is the maximum value or not.
- the high frequency signal generator 65 is controlled in step S 101 so that the minimum frequency f of the first frequency range FR 1 to be input to the input terminal 1
- the I FAG C register value and R FAGC register value for each input signal level are respectively changed by changing the input signal level of the high frequency signal having 20 dBV every 20 dBV to + 20 d BmV.
- step S 102 the high frequency signal generator 65 is controlled to input the maximum frequency f lmax of the first frequency range FR 1 and the minimum frequency f 2 min of the second frequency range FR 2 to be input to the input terminal 1.
- the I FAGC register value and the R FAGC register value for each input signal level are respectively changed to I FAGC register 33 and I FAGC register 33 by changing the input signal level of a high frequency signal having 1 k every 20 d 8111 yen to + 20 d BmV.
- the data is read from RFAGC register 43 and stored in data memory 62.
- Data memory is read from IFAGC register 33 and RFAGC register 43 from IFAGC register value and RFAGC register value for each input signal level by changing from DBmV to +20 dBmV every 1 dB mV.
- step S104 the minimum frequency f of the first frequency range RF 1.
- the range of the input signal level when the AGC register value has the maximum value is searched, and the range is the first frequency range RF 1 level range LR 11 and the RF AG C register value does not have the maximum value.
- the range of the input signal level of the first frequency range RF 1 be the level range LR 12 of the first frequency range.
- step S105 the second frequency is searched for the maximum value of the RF AG C register value based on the measured value of the R FAGC register value for the minimum frequency f 2 min of the second frequency range RF 2 Range
- the maximum value of the RF AG C register value in RF 2 is stored in data memory 62, and the range of the input signal level when the RF AG C register value has the maximum value is searched, and the range is set to the second frequency.
- the level range LR 21 of the range RF 2 is used, and the range of the input signal level when the RF AG C register value does not have the maximum value is set as the level range LR 22 of the second frequency range RF 2.
- step S106 of FIG. 24 an approximation function AF of the relationship based on data indicating the relationship of the I FAGC register value to each input signal level of the level range LR 11 at the minimum frequency f lmin of the first frequency range RF 1 81 a is calculated, and in step S 107, based on data indicating the relationship of the RF AG C register value to each input signal level of the level range LR 12 at the minimum frequency f lmin of the first frequency range RF 1 Calculate the approximate function AF 81 b of the relationship.
- step S108 the I FAGC register values for each input signal level of the level range LR 21 at the maximum frequency f lmax of the first frequency range RF 1 and the minimum frequency of the second frequency range RF 2 ⁇ 2m i ⁇
- An approximation function AF 82 a AF 91 a of the friction relationship is calculated based on the data indicating the relationship
- step S 109 the maximum frequency f lmax of the first frequency range RF 1 and the second frequency range RF 2
- the approximate function AF 82 b AF 91 b of the relationship is calculated based on data indicating the relationship of the RF AG C register value with each input signal lever of the level range LR 22 at the minimum frequency f 2 min of f.
- the second frequency range is Calculate the approximate function AF 92 a of the relationship based on the data indicating the relationship of the IFAGC register: to each input signal level of the level range LR21 at the maximum frequency f 2max of the range RF 2, and in step S 111, calculating an approximate function AF 92 b of the relation based on the data indicating the relationship between RF AG C register value for each input signal level of the range LR 22 in the second maximum frequency f 2ma x frequency range RF 2.
- step S121 it is determined whether or not the input signal level display instruction is input from the input device 53. If YES, the process proceeds to step S122, while NO When it returns to step S121.
- step S122 the IF AG C register value is read out from IF AG C register 33
- the RFAGC register value is read out from the RFAGC register 43
- step S 123 the current reception frequency f rec is the first frequency. It is determined whether the range is FR 1 or not. If YES, then the process proceeds to step S 124, while if NO, the process proceeds to step S 127.
- step S124 it is determined whether the read RFAGC register value is the maximum value of RFAGC values or not. If YES, the process proceeds to step S125, and if NO, the process proceeds to step S126. .
- step S125 based on the read IF AG C register value, the input signal level P imin at the minimum frequency f lmin is calculated using the approximation function AF 81 a, and using the approximation function AF 82 a Calculate the input signal level P iraax at the maximum frequency f lmax and proceed to step S130 .
- step S 126 based on the RF AG C register value read out, as well as calculating an input signal level P imi n at the minimum frequency f lmin using an approximate function AF 81 b, the approximate function AF 82 b calculate the input signal level P imax at the maximum frequency f lmax and have use, step S 1 Go to 30.
- step S127 it is determined whether the read RFAGC register value is the maximum value of RF AGC values, and if YES, the process proceeds to step S128, while if NO, the process proceeds to step S129. move on.
- step S 129 based on the RF AG C register value read out, as well as calculating an input signal level P fmin at the minimum frequency f lmin using an approximate function AF 91 b, and have use an approximate function AF92 b Calculate input signal level P imax at maximum frequency f lmax and proceed to step S130 .
- step S130 the input signal level P in is calculated using equation (2) by the linear approximation method based on the calculated input signal levels P fmin and P im ax , and in step S 131, Display data for displaying the input signal level Pin is generated and output to the OSD controller 19, and the display control process is ended.
- the condition division of the input signal level according to the fourth embodiment and the calculation of the approximation function by the division of the frequency range according to the second embodiment are performed.
- the detection of the input signal level of the high frequency signal is performed. Accuracy can be further improved.
- FIG. 26 is a spectrum diagram showing a case where interference waves of two adjacent channels are present in the vicinity of the reception channel and on both sides of the television receiver 100 according to the seventh embodiment.
- FIG. 26 when there is a spectrum energy of the broadcast signal of the adjacent channel on either side or one side of the reception channel that detects the input signal level, 1 of the interference wave by the broadcast signal of each adjacent channel Wave or 2
- the processing circuit for the intermediate frequency signal such as the band pass filter 8 of FIG. 1 does not have steep band pass filtering characteristics so that the interference waves of the adjacent channels can be completely removed.
- FIG. 27 shows the television receiver 100 according to the seventh embodiment, in the case where there is no interference wave of the adjacent channel, in the case where there is an interference wave of that one wave, and in the case where there are interference waves of those two waves.
- It is a graph which shows an I FAGC register value and an RF AGC register value with respect to an input signal level. As apparent from FIG. 27, it can be understood that display errors occur in the RF AG C register value and the I FAGC register value for each input signal level. Specifically, in the I FAGC register value:
- detection error ER 1 is generated compared to the absence of interference wave
- detection error ER 2 (> ER 1) is generated compared to the absence of interference wave Do.
- the input signal level is approximately 10 dBmV or more (in other words, when the RFAGC register value is not the maximum value), the detection error due to the interference wave is large.
- FIG. 27 shows an example of the above three cases, but in the case of a broadcast signal to be actually delivered, the relationship between the broadcast signal of the reception channel and the DU ratio of the broadcast signal of the adjacent channel is There are various patterns. Therefore, in the present embodiment, when the reception channel is in the middle of the channel arrangement and there are adjacent channels on both sides of the reception channel (two interference waves), the reception channel is at the end of the channel arrangement and one side of the reception channel.
- FIG. 28 shows the desired wave in the television receiver 100 according to the seventh embodiment. It is a graph showing the IF AGC register value against the ratio of interference wave power to power (U / D). As apparent from FIG. 28, as the ratio of the interference wave power to the desired wave power (U / D) increases, it can be seen that the IF AGC register value also increases.
- FIG. 29 is a graph showing the display error ER 2 of the input signal level with respect to the IFA GC register value in the television receiver 100 according to the seventh embodiment.
- the approximation function AF 102 in the case of two interference waves, the approximation function AF 1 0 1 in the case of one interference wave is calculated in advance in the same manner.
- the IF AG C register value having a relatively large detection error is maximized.
- it is characterized by correcting the detection error of the input signal level based on the IF AGC register value.
- FIG. 30 is a flowchart showing the characterizing portion of the display control process executed by the controller 50 according to the seventh embodiment.
- the feature of this process relates to the process of correcting the detection error, and is inserted between step S130 and step S131 of FIG.
- step S141 of FIG. 30, it is determined whether the read out RFAGC register value is the maximum value of the RF AG C value.
- the process proceeds to step S 1 31 in FIG. 25, while if NO the process proceeds to step S 142.
- step S142 it is determined whether or not the adjacent channel is on both sides of the reception channel. If YES, it is determined that there are two interference waves, and the process proceeds to step S143, while if NO, it is one wave. Judging that it is an interference wave, proceed to step S145.
- step S143 the detection error ER 2 is calculated using the approximation function AF 1 02 of the detection error of the input signal level based on the read value of IF AG C, and the detection error ER 2 is calculated in step S 144.
- E the detection error E
- step S145 the detection error ER1 is calculated using the approximation function AF101 of the detection error of the input signal level register based on the read value of IF AG C register value, and the detection error in step S144.
- ER 1 be the detection error ER and proceed to step S147.
- step S 147 The detection error ER is added to the input signal level P in calculated in, and the addition result is set as the input signal level ⁇ ⁇ P in, and the process proceeds to step S 1 31 in FIG.
- the correction processing of the detection error in FIG. 30 is executed using two approximate functions AF 1 0 1 and AF 1 0 2 calculated in advance. And correct the detection error of the input signal level based on the IFAGC register value, particularly when the IFAGC register value having a relatively large detection error is not the maximum value. This can significantly improve the detection error of the input signal level of the broadcast signal.
- the interference wave is divided into one and two interference waves in step S 14 2, in most cases the latter is the case, so the latter case is the case. Only processing may be performed. In addition, the average value of the detection errors in these two cases may be used as the detection error to capture the input signal level.
- the detection error correction process may be performed on the detection value of the input signal level P in.
- the amount of attenuation of the attenuator 4 is changed to control the gain for high frequency signals, but the present invention is not limited to this.
- the amplification degree of the high frequency amplifier 3 may be changed.
- the amplification factor of the intermediate frequency amplifier 7 is changed to control the gain for the intermediate frequency signal, but the present invention is not limited to this.
- the amplification degree of the other intermediate frequency amplifier 9 or the attenuation amount of the attenuator inserted at the intermediate frequency stage may be changed.
- the present invention is not limited to this, and the configuration of the set top box having the input signal level detection function is separated and configured. You may also, the present invention may be configured as a high frequency signal level detection apparatus or a high frequency signal reception apparatus provided with a function of detecting the input signal level of another high frequency signal as well as the broadcast signal.
- the processing of characteristic parts according to each embodiment and the combination thereof are described, but the present invention is not limited to this, and the processing is not limited to the above combination, and processing of other combinations may be performed. It is also good.
- the first relation data of the RF AGC value with respect to the input signal level of the received high frequency signal, and the IF AG with respect to the input signal level of the received high frequency signal is measured in advance, and the RF AG C value and the IF AG C value when the high frequency signal of the measurement target is received are measured, and the measured RF AG C value and the IF AG C value are measured. Based on the value, the measured first and second relationship data are used to detect an input signal level of the received high frequency signal. Therefore, it is possible to provide a high frequency signal level detection device capable of detecting the signal level of a high frequency signal with high accuracy as compared with the prior art, and a high frequency signal reception device using the same.
- the high-frequency signal level detection device is, for example, a set-top box for CATV, a television receiver for receiving CATV, a set-top box for receiving radio broadcast signals, a television receiver, etc. It can be applied to the high frequency signal receiver of
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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MXPA05011285A MXPA05011285A (es) | 2003-04-21 | 2004-04-21 | Dispositivo para determinar el nivel de la senal de alta frecuencia y aparato receptor de la senal de alta frecuencia que utiliza el mismo. |
JP2005505761A JP4249180B2 (ja) | 2003-04-21 | 2004-04-21 | 高周波信号レベル検出装置及びそれを用いた高周波信号受信装置 |
US10/553,902 US7551908B2 (en) | 2003-04-21 | 2004-04-21 | High-frequency signal level detection apparatus and high-frequency signal receiver apparatus using the same |
CA002522271A CA2522271A1 (en) | 2003-04-21 | 2004-04-21 | High frequency signal level detection apparatus and high-frequency signal receiver apparatus using the same |
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JP2003-115553 | 2003-04-21 | ||
JP2003115553 | 2003-04-21 | ||
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JP (1) | JP4249180B2 (ja) |
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JP2006295363A (ja) * | 2005-04-07 | 2006-10-26 | Nippon Hoso Kyokai <Nhk> | 受信レベル測定装置 |
JP2007201584A (ja) * | 2006-01-24 | 2007-08-09 | Dx Antenna Co Ltd | 共同受信システム用増幅器 |
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JP4503400B2 (ja) * | 2004-09-01 | 2010-07-14 | パナソニック株式会社 | 携帯端末装置 |
US8237870B2 (en) * | 2007-09-28 | 2012-08-07 | Intel Corporation | Receiver system for multiple bandwidth television channels |
TWI389467B (zh) * | 2009-04-08 | 2013-03-11 | Ind Tech Res Inst | 自動增益控制方法及裝置 |
US8953670B1 (en) * | 2013-10-25 | 2015-02-10 | Mitsubishi Electric Research Laboratories, Inc. | Digital power encoder for direct digital-RF transmitter |
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JP2001186083A (ja) * | 1999-12-24 | 2001-07-06 | Toshiba Corp | 移動無線端末装置 |
JP2002084205A (ja) * | 2000-06-26 | 2002-03-22 | Matsushita Electric Ind Co Ltd | 自動利得制御装置 |
JP2002217763A (ja) * | 2001-01-19 | 2002-08-02 | Sony Corp | 入力レベル表示方法、入力レベル表示装置 |
JP2002280852A (ja) * | 2001-03-19 | 2002-09-27 | Sharp Corp | 自動利得制御方法、および、自動利得制御回路 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006295363A (ja) * | 2005-04-07 | 2006-10-26 | Nippon Hoso Kyokai <Nhk> | 受信レベル測定装置 |
JP2007201584A (ja) * | 2006-01-24 | 2007-08-09 | Dx Antenna Co Ltd | 共同受信システム用増幅器 |
Also Published As
Publication number | Publication date |
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CA2522271A1 (en) | 2004-11-04 |
JP4249180B2 (ja) | 2009-04-02 |
US20070041480A1 (en) | 2007-02-22 |
US7551908B2 (en) | 2009-06-23 |
JPWO2004095725A1 (ja) | 2006-07-13 |
MXPA05011285A (es) | 2006-05-25 |
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