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1. 发明专利

JPH0369072B2 失效
公开(公告)号：JPH0369072B2
公开(公告)日：1991-10-30
申请号：JP12254883
申请日：1983-07-05
申请人： SAKAGUCHI KYOKAZU
发明人： SAKAGUCHI KYOKAZU
IPC分类号： G01R23/08 , G01R27/02 , G01R27/26

2. 发明专利

JPS63122968A FREQUENCY MEASURING CIRCUIT 失效
公开(公告)号：JPS63122968A
公开(公告)日：1988-05-26
申请号：JP27071686
申请日：1986-11-13
申请人： MITSUBISHI ELECTRIC CORP
发明人： KIMURA YOSHIKO , FUJIYAMA NAOKI
IPC分类号： G01R23/08
摘要： PURPOSE:To enable the measuring of frequencies of two waves close in the frequency inputted simultaneously, by arranging a circuit for detecting amplitude within a pulse, an amplitude detection circuit, an output level selection circuit and a frequency detection circuit. CONSTITUTION:An input signal 1 passes through a filter bank 2, an A/D converter 3, a channel selection circuit 4 and a frequency calculating circuit 5 and a calculated frequency 8 is given as output. At the same time, the output is branched to a circuit 9 for detecting amplitude within a pulse from the filter bank 2 to measure the max. and min. amplitude values within the pulse. Then, an amplitude detection circuit 10 detects the amplitude level of two waves simultaneously inputted. Subsequently, an output level selection circuit 11 selects amplitude levels of two waves of filters from adjacent filter outputs and a frequency detection circuit 12 detects frequency 13 of two waves close to each other.

3. 发明专利

JPS6230525B2 失效
公开(公告)号：JPS6230525B2
公开(公告)日：1987-07-02
申请号：JP5492781
申请日：1981-04-10
申请人： TEKTRONIX INC
发明人： RICHAADO KORONA KABOTSUTO , BURUUSU EDOWAADO HOOFUAA
IPC分类号： G01R23/08 , G01R17/06 , G01R23/20 , G01R29/26 , H03D3/00 , H03D3/26 , H03H7/01 , H03J7/02

4. 发明专利

JPS6271315A NOISE REDUCING CIRCUIT FOR FREQUENCY DISCRIMINATOR 失效
公开(公告)号：JPS6271315A
公开(公告)日：1987-04-02
申请号：JP20358686
申请日：1986-08-29
申请人： TEKTRONIX INC
发明人： RICHIYAADO KORONA KABOTSUTO , BURUUSU EDOWAADO HOOFUAA
IPC分类号： G01R23/08 , G01R17/06 , G01R23/20 , G01R29/26 , H03D3/00 , H03D3/26 , H03H7/01 , H03J7/02

5. 发明专利

JPS60140159A FREQUENCY DIFFERENCE DETECTING CIRCUIT 失效
公开(公告)号：JPS60140159A
公开(公告)日：1985-07-25
申请号：JP25054883
申请日：1983-12-27
申请人： TOSHIBA ENGINEERING CO
发明人： SHINKAI TOSHIKI , IKEZAKI NOBUYA
IPC分类号： G01R23/08
摘要： PURPOSE:To eliminate influence due to the change in temp. while reducing an error due to wave form distortion, by taking out a frequency difference signal by an active filter, and sampling and holding the peak value of said signal. CONSTITUTION:An input signal Si passes a low pass filter 2 and a high pass filter 1 at first and signals SL, SH are respectively rectified through full-wave retifiers 4, 5. A timing pulse generating circuit 3 generates a one shot timing pulse PS at the point of the time when the signal SD resulting from the differentiation of the input signal Si comes to zero. An analogue switch 6 is brought to a continuity state in the timing of the timing pulse PS. A comparator 10 sends a negative output signal order when the hold value L of a hold circuit 7 is smaller than the hold value H of a hold circuit 8. At this time, the output of the hole circuit 8 passes two reversal amplifiers 9, 12 to form a positive output signal So.

6. 发明专利

JPS57165766A FREQUENCY DETECTION SYSTEM 失效
公开(公告)号：JPS57165766A
公开(公告)日：1982-10-12
申请号：JP5343681
申请日：1981-04-06
申请人： MITSUBISHI ELECTRIC CORP
发明人： SUZUKI SUNAO
IPC分类号： G01R23/02 , G01R23/08 , H02H3/46
摘要： PURPOSE:To detect frequency directly by a computer in which calculation is made using the voltage at both ends of a serial resonance circuits that consists of a reactor, condenser and resistance and the voltage at both ends of a resistance. CONSTITUTION:A serial resonance circuit 11 that consists of a reactor 8, condenser 9 and resistance 10 is connected to an AC voltage source 7, and the voltage V1 at both ends of a resonance circuit 11 and the voltage V2 at both ends of a resistance 10 are sampled at a preset period and the values of sampled voltages at the times t0 and t0-T (T is period) are respectively detected. Next, after those voltage values are A/D converted, it is input to the input circuit of CPU. The calculation circuit in the CPU that has received this input conducts calculation according to the FormulaIand based on the positive or negative state of the result the frequency of the electric power source 7 is detected. In this way frequency can be directly detected by a computer system.

7. 发明专利

JPS55116274A AUTOMATIC FREQUENCY DISCRIMINATING CIRCUIT FOR COMMERCIAL POWER SUPPLY 失效
公开(公告)号：JPS55116274A
公开(公告)日：1980-09-06
申请号：JP2472979
申请日：1979-03-02
申请人： NIPPON ELECTRIC CO
发明人： SHIMADA TOMOYUKI , WATANABE HIDEAKI
IPC分类号： G01R23/08 , G01R23/02
摘要： PURPOSE:To discriminate a commercial power supply frequency without using a manual switching means by detecting the outputs of two bandpass filtes having different power supply frequencies as their center frequencies and comparing these outputs. CONSTITUTION:Commerical power supply is connected to bandpass filter BPF1 having No.1 commercial power supply frequency as its center frequency and also to bandpass filter BPF2 having No.2 commercial power supply frequency as its center frequency, and their outputs are respectively detected by detectors DET1, DET2. Further, these detected outputs are compared in comparator A3, and thereby a signal to discriminate whether it is No.1 frequency or No.2 frequency is obtained. Consequently, it is possible to discriminate automatically a 50Hz or 60Hz commerical power supply frequency without using a manual switching means, so that it is possible to switch instantly a circuit when the commercial power supply frequency requires the switching.

8. 发明专利

JPS54123979A FREQUENCY DETECTING CIRCUIT 失效
公开(公告)号：JPS54123979A
公开(公告)日：1979-09-26
申请号：JP3129878
申请日：1978-03-17
申请人： MITSUBISHI ELECTRIC CORP
发明人： HARA KEN
IPC分类号： G01R23/08 , G01R23/02
摘要： PURPOSE:To enable input frequencies to be automatically detected by controlling a frequency setting means by the output of a counter circuit in a facsimile. CONSTITUTION:An FF 21 and a counter circuit 25 are set by a set pulse 22. This causes the S1 of a multiplexer 26 to go ON to ground R1 of a resistance network 27, then the center frequency of a BPF 12 becomes f1. When the input signal 11 of a frequency fm is applied, a voltage comparator 18 does not operate and therefore the low frequency signal 24 passes through a gate 23 and advances the count output of the circuit 25 by 1, then the S2 of the circuit 26 goes ON and the S1 goes OFF to ground the resistance R2. The center frequency of a BPF 12 then becomes f2. From this point on, when the resistance Rm is grounded in a similar manner, the center frequency of the BPF 12 becomes fm and by the output thereof the FF 21 is reset and the gate 23 is closed, thus from the count output of the circuit 25 the input signal frequency may be known.

9. 发明专利

JPS53136873A DIGITAL COUNT GENERATOR FOR INDICATING AVERAGE VALUE OF VARIABLE FREQUENCY 失效
公开(公告)号：JPS53136873A
公开(公告)日：1978-11-29
申请号：JP2170478
申请日：1978-02-28
申请人： LUCAS INDUSTRIES LTD
发明人： JIEIMUZU MAIKERU SARUTO
IPC分类号： F02P5/15 , G01D1/02 , G01L23/08 , G01L23/20 , G01R23/02 , G01R23/08 , G01R23/10

10. 发明专利

JPS5379579A FREQUENCY DETECTOR 失效
公开(公告)号：JPS5379579A
公开(公告)日：1978-07-14
申请号：JP15416976
申请日：1976-12-23
申请人： TOKYO SHIBAURA ELECTRIC CO
发明人： MITSUGI TAKUMI
IPC分类号： G01R23/08 , G01R23/02
摘要： PURPOSE:To prevent chuttering and bouncing of a relay by detecting the instantaneous value product level of a.c. inputs passing through a BF filter and a LP or HP filter.

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