WO2005071839A1 - Ifカウント方式 - Google Patents
Ifカウント方式Info
- Publication number
- WO2005071839A1 WO2005071839A1 PCT/JP2005/000151 JP2005000151W WO2005071839A1 WO 2005071839 A1 WO2005071839 A1 WO 2005071839A1 JP 2005000151 W JP2005000151 W JP 2005000151W WO 2005071839 A1 WO2005071839 A1 WO 2005071839A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- count
- counting
- signal
- value
- information
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K21/00—Details of pulse counters or frequency dividers
- H03K21/40—Monitoring; Error detection; Preventing or correcting improper counter operation
Definitions
- the present invention relates to an IF counting method in an IF counter used for a radio receiver.
- an IF counter conventionally used for counting an IF includes, for example, an IF counter 15 composed of n bits as shown in FIG. 1A.
- An IF count period generation unit 16 for generating an IF count period for the IF count unit 15, an IF count upper limit preset unit 17 for setting an IF count upper limit value composed of n bits, and an n bit
- An IF count period generation unit 16 for generating an IF count period for the IF count unit 15
- an IF count upper limit preset unit 17 for setting an IF count upper limit value composed of n bits
- an n bit In order to compare the count value counted by the IF count lower limit preset section 18 with the IF count lower limit preset section 18 for setting the IF count lower limit value configured by Lower limit value ratio for comparing the count value counted by the upper limit value comparison unit 19 consisting of n bits and the IF count lower limit value preset unit 18 with the count value counted by the IF count unit 15
- the IF counting section 15 counts the IF signal input within a predetermined period generated by the IF counting period generation section 16.
- the count value counted by IF counting section 15 is input to upper limit comparing section 19 and lower limit comparing section 20.
- the upper limit comparison unit 19 compares the input count value with the IF count upper limit preset in the IF count upper limit preset unit 17 and, for example, in the case of “count value> IF count upper limit”. Outputs result 0, and outputs comparison result 1 when “count value ⁇ IF count lower limit value”.
- the lower limit comparison unit 20 is configured to determine whether the input count value is equal to the IF count lower limit preset unit.
- the comparison results by the upper limit comparator 19 and the lower limit comparator 20 are input to the determiner 21 to determine whether the count value is within the range of the IF count upper limit to the IF count lower limit. For example, by performing a logical product of the comparison result of the upper limit comparator 19 and the comparison result of the lower limit comparator 20 in the decision unit 21, when the output of the decision unit 21 is 1, the count value becomes the IF count value upper limit value. Is detected to be within the range of the IF count lower limit value.
- Patent Document 1 discloses an FM'RDS which automatically compares the name of a broadcasting station with the first automatically detected broadcasting station and automatically changes the name based on the broadcasting station name. It discloses a radio receiver, and discloses frequency comparison means when performing auto-scanning for a desired frequency.
- Patent Document 2 measures the error amount of the number of IF noises within a certain time by counting the ratio of lZO of data demodulated by a demodulation circuit in parallel with the counting of the number of IF pulses.
- An IF counting method is disclosed. In this method, the IF count number is corrected by a correction circuit using the measured error amount, and a frequency count circuit that measures the IF frequency is used, and an accurate IF frequency value is obtained without being affected by the count error due to modulation. Is possible.
- Patent Document 1 JP-A-10-341138
- Patent Document 2 Japanese Patent Application Laid-Open No. 11-234353
- the conventional circuit shown in FIG. 1A has a problem that the circuit configuration becomes large-scale.
- the circuit in order to realize a radio receiver on a single chip, the circuit must be made slimmer than before.
- the present invention has been made in view of the above-described problem, and a problem to be solved is to provide an IF counting method for realizing an IF counter with a smaller circuit configuration than in the past.
- the invention according to claim 1 is a painting method of an IF counter that counts an IF signal for a predetermined period, wherein an upper limit value presetting process for giving an upper limit of a desired count value as an initial value of a count start.
- Generating a period for counting the IF signal Processing a down-counting IF counting process of performing down-counting according to the IF signal from an initial value set by the upper limit preset section within a period generated by the IF counting period generating process; IF count upper / lower value difference preset processing for providing information on the difference between the upper and lower count values, IF count upper / lower value difference information given to the IF count upper / lower value difference preset processing, and the down count.
- the value set in the upper limit preset process by the down-counting IF count process also performs a decrement process in accordance with the IF signal, so that the IF signal becomes If the value is larger than the upper limit value, it is counted to 0 and the decrement process is still performed. Therefore, the most significant bit becomes 1, and the IF signal is determined to be larger than the desired upper limit value by the determination process. If the result is that the value set in the IF count upper / lower limit value difference preset processing is equal to or greater than the value based on the first information and all the bits constituting the second information are 0, the determination is made.
- the processing determines that the IF signal is within the range of the desired upper limit value and lower limit value, and further, if all bits constituting the second information are not zero.
- the IF signal is determined by the determination process to be smaller than the desired lower limit value, whereby the upper limit value preset process and the IF count upper / lower limit value difference preset process are set in advance. It is possible to determine whether the number of bits constituting the desired lower limit set in the upper / lower value difference preset process or the number of bits constituting information to be compared in the comparison process is determined. This makes it possible to reduce the size of the circuit, which has the effect of reducing the circuit configuration.
- the first information is composed of n + 1 bits by the down-counting IF counting process.
- the second information is upper n + 1-m bits of the count information.
- the most significant bit is 1, it is determined that the IF signal is larger than the desired upper limit, and the information of the upper n + 1-m bits of the count value of the IF signal counted in the down-counting IF count processing is determined.
- the upper n + 1-m bits are all 0 and the value of the lower m bits of the IF signal count value counted by the down-counting IF count processing is equal to or less than the value set in the IF count upper / lower limit value difference preset processing Is determined to be within the range of the desired upper limit value and lower limit value, and the upper n + l_m bits of the information of the count value of the IF signal counted by the down-counting IF count process. If all of the + 1-m bits are not 0, it is possible to determine that the value is smaller than the desired lower limit.
- the invention according to claim 3 is characterized in that the IF signal selectively uses any one of four division ratios of 1/2, 1/4, 1/8, 1/16, and 1/32.
- the same effect as that of the first aspect is obtained, and even if the frequency of the IF signal is high, the frequency division ratio is changed to change the higher frequency IF. This has the effect that the signal can be counted.
- the invention according to claim 4 is an IF counter for counting an IF signal for a predetermined period, wherein an upper limit value presetting process for giving an upper limit of a desired count value as an initial value of a count start; IF count period generation processing for generating a period to be counted, and down-counting for down-counting according to the IF signal from an initial value set in the upper limit preset processing within the period generated by the IF count period generation processing.
- Method IF force processing and the first information and the second information based on the count information by the down-counting IF count processing determine whether the count value is within the desired upper limit value and lower limit value.
- an IF counting method for counting an IF signal for a predetermined period, wherein an upper limit value presetting process for giving an upper limit of a desired count value as an initial value of a count start; IF count period generation processing for generating a period to be counted, and down-counting for down-counting according to the IF signal from an initial value set in the upper limit
- the value set in the upper limit preset process by the down-counting IF count process also performs a decrement process according to the IF signal, so that the IF signal becomes If the value is larger than the upper limit value, it is counted to 0 and the decrement process is still performed.
- the constant processing determines that the IF signal is larger than the desired upper limit, and if all bits forming the second information are 0, the IF processing determines that the IF signal is equal to the desired upper limit and In the case where it is determined that the IF signal is within the range of the lower limit and all the bits constituting the second information are not 0, the IF signal is smaller than the desired lower limit by the determination process.
- the invention according to claim 5 is an IF counter for counting an IF signal for a predetermined period, wherein an upper limit preset section for giving an upper limit of a desired count value as an initial value of a count start, An IF count period generating section for generating a period to be counted, and performing down-counting according to the IF signal from an initial value set by the upper limit preset section within a period generated by the IF count period generating section.
- Down count method IF count section, IF count upper / lower value difference preset section that gives information on the difference between the upper and lower limit values of the desired count value, and information set in the IF count upper / lower value difference preset section.
- a comparing unit that compares the down force type IF count unit with first information based on the count information; and a down count type IF count unit.
- a determination unit for determining whether a count value falls within the range of the desired upper limit value and lower limit value based on second information based on the count information and the comparison result information of the comparison unit. This is an IF counter.
- the down-counting IF counting section performs a decrement process according to the IF signal from the value set in the upper limit preset section, so that the IF signal is If it is larger than the upper limit value, it is counted to 0 and the decrement process is still performed, so that the most significant bit becomes 1, and the determination unit determines that the IF signal is larger than the desired upper limit value.
- the determination unit determines that the IF signal is within the range of the desired upper limit value and lower limit value, and further, if all bits constituting the second information are not 0, the The IF signal by The signal has the same effect as that of claim 1 by the action determined to be smaller than the desired lower limit, and the upper limit is preset in the upper limit preset unit and the IF count upper / lower limit difference preset unit.
- the invention according to claim 6 is an IF counter that counts an IF signal for a predetermined period, wherein an upper limit preset section that gives an upper limit of a desired count value as an initial value of a count start; An IF count period generation unit for generating a period to be counted; and an initial value set by the upper limit preset unit within a period generated by the IF count period generation unit. It is determined whether the count value is within the range of the desired upper limit value and lower limit value from the first information and the second information based on the count information in the down-counting IF counting section, and the count information in the down-counting IF counting section.
- An IF counter characterized by having a determination unit for determining the IF counter.
- the IF signal is decremented from the value set in the upper limit preset unit by the down-counting IF counting unit according to the IF signal. If the IF signal is larger than the upper limit, if the IF signal is larger than the desired upper limit, the value is counted to 0 and the decrement process is still performed. If the bits constituting the second information are all 0, it is determined by the determination unit that the IF signal is within the range of the desired upper limit value and lower limit value. When the bits constituting the second information are not all 0, the determination unit determines that the IF signal is smaller than the desired lower limit. It is possible to determine whether the IF signal is within a predetermined range by presetting the upper limit value set by the upper limit value preset section, and it is not necessary to perform a preset process for the lower limit value. This has the effect of reducing the road configuration.
- FIG. 1A is a functional block diagram showing a conventional example.
- FIG. 1B is a functional block diagram showing a first embodiment of the present invention.
- FIG. 2 is a circuit diagram showing a main part of the first embodiment of the present invention.
- FIG. 3 is a diagram showing waveforms of main parts output by the circuit shown in FIG. 2.
- FIG. 4 is a functional block diagram showing a second embodiment of the present invention.
- FIG. 1B is a functional block diagram of the first embodiment of the present invention.
- the IF counter includes a down-counting type IF counting unit 1 for counting a divided IF signal, and an IF counting period generating unit for generating a period for counting the IF signal in the down-counting type IF counting unit 1. 2, the down-count method IF count unit 1 that gives the initial value to start counting, the IF count upper limit preset unit 3, and the information about the lower m bits of the count value counted by the down-count method IF count unit 1.
- the IF counter according to the present embodiment is formed on a semiconductor circuit board by a CMOS process capable of manufacturing p-channel and n-channel MS transistors.
- the IF counting unit 1 has a function of counting data composed of n + 1 bits. Using the data composed of n bits preset in the IF count upper limit preset unit 3 as an initial value, the IF signal is decremented, for example, by one, within a predetermined period generated by the IF count period generating unit 2, and an IF signal is generated. Count.
- IF count period generating section 2 generates a period in which IF counting section 1 counts down IF signals. That is, a clock signal input to the down-counting IF counting unit 1 is monitored, and a reset signal is sent to the down-counting IF counting unit 1 when the generated predetermined period has elapsed.
- IF count upper limit preset section 3 an upper limit of the IF count value composed of n bits is set in advance, and an initial value at the start of counting is given to IF count section 1 of the down-counting method.
- IF count upper / lower limit difference preset unit 4 a difference value between the upper limit value and the lower limit value of the IF count value composed of m bits is set in advance, and is counted by the down-counting IF count unit 1. It is used to compare the data with the lower m bits of the count value consisting of the n + 1 bits.
- the lower m-bit comparing unit 5 is configured to calculate the information of the lower m bits of the count value of the IF signal counted by the down-counting IF counting unit 1 and the IF force value set in the IF count upper limit preset unit 4. The information of the difference between the upper and lower limits is input and compared, and the comparison result is output to the determination unit 6.
- the determination unit 6 determines the IF signal from the upper n + 1—m bits of the count value of the IF signal counted by the down-counting IF counter 1 and the information of the comparison result of the lower m bits comparison unit 5. Whether the count value is in the range between the upper limit value set in IF count upper limit preset unit 3 and the lower limit value based on the value set in IF count upper limit preset unit 3 and IF count upper / lower limit difference preset unit 4 And outputs the result. In other words, if the most significant bit of the upper n + 1-m bits of the count value of the IF signal counted by the down-counting IF counting unit 1 is 1, it is determined that the IF signal is larger than the desired upper limit value.
- the down-count method IF counter 1 counts the upper n + 1-m bits of the IF signal count value, and the upper n + 1-m bits of the information are all 0, and the down-count method IF counter 1 counts down. If the value of the lower m bits of the IF signal count value is equal to or less than the value set in the IF count upper / lower value difference preset unit 4, it is determined that the value falls within the desired upper limit value and lower limit value, and the download is performed. Counting method If the upper n + 1-m bits of the upper n + 1-m bits of the count value of the IF signal counted by the IF counter 1 are not all 0, it is determined to be smaller than the desired lower limit.
- each constituent element has a small number of bits by using the lower m-bit comparing unit 5 composed of m bits having a relationship of n> m and the IF count upper / lower limit value difference preset unit 4. Therefore, it is possible to reduce the circuit scale as a whole.
- the IF signal frequency can be at the desired upper limit and lower limit without using the IF count lower limit presetting unit 18 and the lower limit comparing unit 20 composed of n bits shown in FIG. 1A. Can be determined, and the circuit configuration can be made smaller than before.
- FIG. 2 is a circuit diagram showing a main part of the first embodiment of the present invention.
- the IF counter used in this embodiment is obtained from the 12-bit down counter 7 for counting the divided IF signal, the lower 7 bits of the count value counted by the 12-bit down counter, and the signal line CP. It is counted by a 7-bit comparator 8 and a 12-bit down counter, which are not shown, for example, for comparing a value preset in an IF count upper / lower limit value difference preset unit composed of DIP—SWITCH and a register.
- the circuit includes at least an output register 13 for outputting a determination result as to whether the value is between the upper limit value and the lower limit value, and an RS flip-flop 12 for controlling a signal output from the output register 13.
- the 12-bit down counter 7 corresponds to the down-counting IF counting unit 1 shown in FIG. 1B.
- the 12-bit down counter 7 shows the data signal D preset in the 11-bit IF count upper limit preset section, which is composed of, for example, a DIP-SWITCH and registers (not shown), and the IF signal to be counted.
- the IF signal CKS and the reset signal RST which are further frequency-divided by a frequency divider (not shown), are input through a limiter circuit not shown.
- the data set in the IF count upper limit preset section (not shown) composed of, for example, a DIP-SWITCH and a register is set in the 12-bit down counter 7 via the signal D. Is done.
- the 12-bit down counter 7 counts down according to the IF signal CKS with the set IF count upper limit set as an initial value.
- the frequency division ratio of the frequency divider can be, for example, 1Z2, 1/4, 1/8, 1/16, 136, etc., and the time base can be set as required.
- About 4mS-about 32mS Set as follows.
- the 7-bit comparator 8 corresponds to the lower m-bit comparator shown in FIG. 1B.
- the 7-bit comparator 8 has a 7-bit IF signal composed of DIP-SWITCH and registers (not shown).
- the data signal CP preset in the upper and lower limit value difference preset and the lower 7 bits of the 12-bit down counter 7 When data Q [6: 0] ⁇ signal CP, "1" is output as output signal CLTD.
- the AND circuits 911 correspond to the determination unit 6 shown in FIG. 1B.
- the AND circuit 9 outputs “1” as the output signal UD0 when the upper 5 bits of data Q [l 1: 7] of the 12-bit down counter 7 are input and all bits are “0”.
- the output signal CLTD from the 7-bit comparator 8
- the output signal UD0 from the AND circuit 9 and the most significant bit data Q [ll] of the 12-bit down counter 7 to the AND circuits 10 and 11
- the signal Q [l 1] is "1
- "1" is output as the output signal JUX (section (3) shown in FIG.
- An input signal J-SR which is an input signal to the RS flip-flop 12, is a signal to which an IF power event period generating circuit power not shown is also output, and instructs the start of a count period in synchronization with the reset signal RST.
- the input signal IF-LA is a signal output from an IF count period generation circuit (not shown), and is a signal for instructing the end of the count period in synchronization with the time base signal TBX.
- the output signals CFE, JL, and LU are (0) , 0, 1), and the difference between the upper limit and the IF
- the output signal CJE, JL, JU) is (1, 0, 0) if it is between the lower limit based on the preset upper limit and the output signal CJE, JL, JU) if it is less than the lower limit. Becomes (0, 1, 0).
- FIG. 3 is a diagram showing waveforms of main parts output by the circuit shown in FIG.
- the output register 13 is reset by turning on the input signal J_SR to the RS flip-flop 12 in synchronization with the signal RST. Furthermore, the signal TBX indicating the IF count period (time base period) is set to the ⁇ N state by the IF count period generation circuit, and the DIP SWITCH input from the signal D and the IF count upper limit value configured by the register and the like. The count set by the 12-bit down counter 7 starts with the value set in the preset section as the initial value.
- FIG. 5 shows a case where the signal TBX is turned off in the section (1) shown in the figure. That is, when the signal TBX is turned off, the input signal IF_LA to the RS flip-flop 12 becomes ⁇ N, and the state of the signals JEX, JLX, and JUX in the section (1) is output via the output register 13 to the signals JE, JL, JU. (In this case, the output signals CiE, JL, JU) are (0, 1, 0).
- FIG. 4 is a functional block diagram showing a second embodiment of the present invention.
- the IF counter includes an IF count section 1 configured with n + 1 bits, an IF count period generation section 2 configured to generate an IF count period for the down-count type IF count section 1, and ,
- the IF count upper limit preset section 3 for setting the IF count upper limit consisting of n bits, and whether the count value counted by the down-counting IF count section 1 is within a predetermined range.
- a judgment unit 14 for judging.
- the IF counting unit 1 has a function of counting data composed of n + 1 bits. Using the data composed of n bits preset in the IF count upper limit preset unit 3 as an initial value, the IF signal is decremented, for example, by one, within a predetermined period generated by the IF count period generating unit 2, and an IF signal is generated. Count.
- the IF count period generation unit 2 generates a period in which the down-counting IF count unit 1 counts an IF signal. That is, a clock signal input to the down-counting IF counting unit 1 is monitored, and a reset signal is sent to the down-counting IF counting unit 1 when the generated predetermined period has elapsed.
- the determining unit 14 receives the count value counted by the down-counting IF counting unit 1 as an input. Then, it is determined whether the count value is within a range between a predetermined upper limit value and a lower limit value.
- the predetermined upper limit is a value preset in the IF count upper limit preset unit 3, and the lower limit is given by m-bit data satisfying the relationship of n> m.
- the down count method If the most significant bit (n + 1 bits) of the count value counted by the IF counting unit 1 is the down count method, it is determined that the IF count value> IF count upper limit value, and the down count method IF If all of the upper ⁇ + 1-m bits of the count value counted by the count unit 1 are ', 0', it is determined that IF count lower limit ⁇ IF count value ⁇ IF count upper limit. If all the upper n + 1-m bits of the count value counted by the IF counting unit 1 are not "0", it is determined that the IF count value is lower than the IF count lower limit value.
- This embodiment is realized by using a circuit in which the 7-bit comparator 8 and the AND circuit 10 are removed from the circuit diagram shown in FIG. 2 (therefore, the signal CP and the signal Q [6: 0] are not used). That is, the output signal UD0 from the AND circuit 9 becomes the output signal JEX and the input signal to the AND circuit 11.
- the other circuit configuration is the same as the circuit configuration shown in FIG. That is, the 12-bit down counter 7 corresponds to the down-counting IF count unit 1 shown in FIG.
- the 12-bit down counter 7 includes a data signal D set in advance in an 11-bit IF count upper limit preset unit configured by a DIP-SWITCH, a register, and the like, which are not illustrated, and an IF target IF An IF signal CKS whose signal is frequency-divided by a frequency divider (not shown) via a limiter circuit (not shown) and a reset signal RST are input.
- the data set in the IF count upper limit preset section composed of a DIP-SWITCH and a register (not shown) is set in the 12-bit down counter 7 via the signal D. .
- the 12-bit down counter 7 counts down according to the IF signal CKS with the upper limit of the IF count set as an initial value.
- the frequency division ratio in the frequency divider for example, 1Z2, 1/4, 1/8, 1/16, 136, etc. are selectively used.
- the time base is set to be about 4mS 32mS as necessary.
- the AND circuits 9 and 11 correspond to the determination unit 14 shown in FIG.
- AND circuit 9 has 12 bits When the upper 5 bits of data Q [l 1: 7] of the down-counter 7 are input and all bits are '0', “1” is output as the output signal UD0.
- T ' By inputting the output signal UD0 from 9 and the data Q [ll] of the most significant bit of the 12-bit down counter 7, T 'is output as the output signal JUX in the case of the signal Q [ll].
- T ' is output as the output signal JUX in the case of the signal Q [ll].
- the input signal J_SR which is an input signal to the RS flip-flop 12, is a signal output from an IF count period generation circuit (not shown), and is a signal instructing the start of a count period in synchronization with the reset signal RST. is there.
- the input signal IF_LA is a signal output from an IF count period generation circuit (not shown), and is a signal instructing the end of the count period in synchronization with the time base signal TBX.
- the output signal CJE, JL, LU becomes (0). , 0, 1), and between the upper limit and the lower limit based on the IF count upper limit preset section, the output signal CiE, JL, JU) becomes (1, 0, 0), and In this case, the output signal (JE, JL, JU) becomes (0, 1, 0).
- the circuit scale can be further reduced as compared with the IF counter having the circuit configuration shown in the first embodiment.
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- Synchronisation In Digital Transmission Systems (AREA)
- Manipulation Of Pulses (AREA)
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP05709238A EP1710915A4 (en) | 2004-01-26 | 2005-01-07 | IF counting method |
US10/586,757 US20080247500A1 (en) | 2004-01-26 | 2005-01-07 | If Counting Method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004017243A JP2005210610A (ja) | 2004-01-26 | 2004-01-26 | Ifカウント方式 |
JP2004-017243 | 2004-01-26 |
Publications (1)
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WO2005071839A1 true WO2005071839A1 (ja) | 2005-08-04 |
Family
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PCT/JP2005/000151 WO2005071839A1 (ja) | 2004-01-26 | 2005-01-07 | Ifカウント方式 |
Country Status (5)
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US (1) | US20080247500A1 (ja) |
EP (1) | EP1710915A4 (ja) |
JP (1) | JP2005210610A (ja) |
CN (1) | CN1914805A (ja) |
WO (1) | WO2005071839A1 (ja) |
Families Citing this family (7)
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JP2010271091A (ja) | 2009-05-20 | 2010-12-02 | Seiko Epson Corp | 周波数測定装置 |
JP5440999B2 (ja) * | 2009-05-22 | 2014-03-12 | セイコーエプソン株式会社 | 周波数測定装置 |
JP5517033B2 (ja) | 2009-05-22 | 2014-06-11 | セイコーエプソン株式会社 | 周波数測定装置 |
JP5582447B2 (ja) | 2009-08-27 | 2014-09-03 | セイコーエプソン株式会社 | 電気回路、同電気回路を備えたセンサーシステム、及び同電気回路を備えたセンサーデバイス |
JP5815918B2 (ja) | 2009-10-06 | 2015-11-17 | セイコーエプソン株式会社 | 周波数測定方法、周波数測定装置及び周波数測定装置を備えた装置 |
JP5876975B2 (ja) | 2009-10-08 | 2016-03-02 | セイコーエプソン株式会社 | 周波数測定装置及び周波数測定装置における変速分周信号の生成方法 |
JP5883558B2 (ja) | 2010-08-31 | 2016-03-15 | セイコーエプソン株式会社 | 周波数測定装置及び電子機器 |
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JPH06276057A (ja) * | 1993-03-22 | 1994-09-30 | Toshiba Corp | Ifカウント方式 |
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US3753119A (en) * | 1971-04-07 | 1973-08-14 | Magnavox Co | Digital tuning indicator |
US4291414A (en) * | 1979-05-02 | 1981-09-22 | Nippon Gakki Seizo Kabushiki Kaisha | Radio receiver operable in station search mode or station select mode |
JPH11101827A (ja) * | 1997-09-25 | 1999-04-13 | Sanyo Electric Co Ltd | 信号検出回路 |
KR100513319B1 (ko) * | 2003-08-26 | 2005-09-07 | 삼성전기주식회사 | 디지탈 자동 미세 조정 방법 및 장치 |
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2004
- 2004-01-26 JP JP2004017243A patent/JP2005210610A/ja active Pending
-
2005
- 2005-01-07 CN CNA2005800031738A patent/CN1914805A/zh active Pending
- 2005-01-07 WO PCT/JP2005/000151 patent/WO2005071839A1/ja active Application Filing
- 2005-01-07 EP EP05709238A patent/EP1710915A4/en not_active Withdrawn
- 2005-01-07 US US10/586,757 patent/US20080247500A1/en not_active Abandoned
Patent Citations (2)
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JPH05152902A (ja) * | 1991-11-27 | 1993-06-18 | Sharp Corp | 受信機 |
JPH06276057A (ja) * | 1993-03-22 | 1994-09-30 | Toshiba Corp | Ifカウント方式 |
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JP2005210610A (ja) | 2005-08-04 |
US20080247500A1 (en) | 2008-10-09 |
EP1710915A1 (en) | 2006-10-11 |
EP1710915A4 (en) | 2007-01-10 |
CN1914805A (zh) | 2007-02-14 |
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