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91. 发明专利

JP3508501B2 Frequency spectrum display device 失效
公开(公告)号：JP3508501B2
公开(公告)日：2004-03-22
申请号：JP26312097
申请日：1997-09-29
申请人：松下電器産業株式会社
发明人：裕隆遠藤 , 正英長谷岡
IPC分类号： G01R23/165 , G01D7/00 , G01R23/16

92. 发明专利

JP2003227854A FREQUENCY ESTIMATION DEVICE AND FREQUENCY ESTIMATION METHOD 审中-公开
公开(公告)号：JP2003227854A
公开(公告)日：2003-08-15
申请号：JP2002027013
申请日：2002-02-04
申请人： MITSUBISHI ELECTRIC CORP
发明人： HORIUCHI WATARU
IPC分类号： G01R23/165 , G01H1/14 , G01R23/02
摘要： PROBLEM TO BE SOLVED: To obtain a frequency estimation device capable of accurately estimating the frequency in an input signal. SOLUTION: The frequency estimation device is provided with a first filter input with signal 1 containing frequency ω r component and processing based on a gain characteristic having an extremum at the first frequency ω 1 , a first amplitude calculator 4 calculating according to an algorithm from the first filter output, a second filter 3 input with signal 1 and processing based on a gain characteristic having an extremum at the second frequency ω 2 , a second amplitude calculator 5 calculating according to an algorithm from the second filter output, a subtracter 8 subtracting the result 7 of the second amplitude calculator from the result 6 of the first amplitude calculator, a coefficient generator 10 multiplying a constant (k) to the subtracted result 9, and an adder 12 adding the processed result 22 of the coefficient generator and the n-1th frequency estimation value 13. The first frequency ω 1 and the second frequency ω 2 during nth frequency estimation are determined with n-1th frequency estimation value 13 and the processed result of the adder 12 is made the nth frequency estimation value 14 and frequency estimation is repeated until the subtraction result 9 lowers to a specific value. COPYRIGHT: (C)2003,JPO

93. 发明专利

JP2003091931A SIGNAL REPRODUCTION BLOCK 审中-公开
公开(公告)号：JP2003091931A
公开(公告)日：2003-03-28
申请号：JP2001280960
申请日：2001-09-17
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： FUJIYAMA HIROKUNI , MORIE TAKASHI
IPC分类号： H04N17/06 , G01R23/165 , G01R29/26 , G11B5/09 , G11B20/10
摘要： PROBLEM TO BE SOLVED: To avoid the occurrence of signal degradation during reproduction processing caused by parasitic effect of output signal lines which are being added to a signal reproduction block of a DVD player in order to output characteristic information signals to the external while measuring group delay characteristics of an LPF 2 that is assembled into the block. SOLUTION: Output signal line 210 is arranged at the output side of an A/D converter 4 to avoid degradation in analog signals, during reproduction processing, caused by parasitic effect of the line. Moreover, characteristic information signals are converted into digital signals by the converter 4 and outputted. Thus, degradation in the characteristic information signals is avoided and measurement precision is improved.

94. 发明专利

JP2002152072A RECEIVING DEVICE 失效
公开(公告)号：JP2002152072A
公开(公告)日：2002-05-24
申请号：JP2000347028
申请日：2000-11-14
申请人： MITSUBISHI ELECTRIC CORP
发明人： MATSUBARA KOJI
IPC分类号： G01R23/165 , G01R29/08 , H04B1/16 , H04B1/18 , H04B1/26 , H04N5/44
摘要： PROBLEM TO BE SOLVED: To improve frequency calculation precision in the reception device of a channelized system. SOLUTION: A pulse amplitude value stable detection circuit 6 is arranged in the reception device of the channelized system. It is detected that the amplitude value of the pulse of an input signal 10 is stabilized and a frequency is calculated by using the amplitude of timing which does not include error. Thus, the frequency is precisely calculated.

95. 发明专利

JP2002506525A 失效
公开(公告)号：JP2002506525A
公开(公告)日：2002-02-26
申请号：JP50401799
申请日：1998-06-24
IPC分类号： G01R23/16 , G01R23/165 , G01R23/173 , G01R23/18

96. 发明专利

JP2001144586A BAND VARIABLE FILTER AND SIGNAL ANALYZER USING THE FILTER 失效
公开(公告)号：JP2001144586A
公开(公告)日：2001-05-25
申请号：JP32059099
申请日：1999-11-11
申请人： ANRITSU CORP
发明人： KISHI YUJI
IPC分类号： G01R23/165 , G01R23/173 , H03F3/50 , H03H11/04
摘要： PROBLEM TO BE SOLVED: To obtain a low noise output over the entire filter frequency from a narrow band to a broadband with immunity to an impedance change when the band of the filter is varied. SOLUTION: The filter frequency bandwidth of an input signal of a crystal vibrator 3a of the bandwidth variable filter 1 is freely varied in response to a varied impedance and controlling a current to a PIN diode 3b by a current control section 5 varies this impedance. A buffer circuit 4 consists of a pre-stage FET 7 and post-stage transistors(TRs) 8 in Darlington connection subjected to source follower and emitter follower respectively. Thus, even in the case that the filter frequency band is wide, the input impedance is high, a generated noise voltage is decreased to reduce the noise and a prescribed gain can be obtained.

97. 发明专利

JP3148631B2 失效
公开(公告)号：JP3148631B2
公开(公告)日：2001-03-19
申请号：JP9967696
申请日：1996-03-29
IPC分类号： G01R23/16 , G01R23/165 , H03G1/00

98. 发明专利

JP2001069017A RADIO COMMUNICATION EQUIPMENT AND CIRCUIT AND METHOD FOR DETECTING FREQUENCY 失效
公开(公告)号：JP2001069017A
公开(公告)日：2001-03-16
申请号：JP24519199
申请日：1999-08-31
申请人： NEC SAITAMA LTD
发明人： ICHIHASHI TAMAMI
IPC分类号： G01R23/165 , G01R23/173 , G01R31/00 , H03D1/10 , H04B1/04
摘要： PROBLEM TO BE SOLVED: To detect whether modulation is normally executed or not by modulating a carrier wave by means of a first signal to output a modulation wave, taking out a part of the output to detect the frequency component amount of a carrier wave frequency which is included in a generated second signal, and judging whether modulation is normally executed or not. SOLUTION: A directional coupler 3 outputs the majority c' of a transmission output signal (c), takes-out a part of the transmission output signal (c) and outputs it to a band-pass filter 4 as the second signal (d). The filter 4 takes out a frequency component in the neighborhood of the frequency of the carrier wave from the second signal (d) and it is made to be the third signal (e) and inputted to a smoothing circuit 5. The circuit 5 rectifies the third signal (e) in a diode 5-1, generates a detection level voltage (f) and inputs it to a comparator 6. The comparator 6 outputs an abnormality report signal (g) to a reporting part 7 when it is judged that modulation by a modulator is not normally executed.

99. 发明专利

JP2001067053A DISPLAY DEVICE 失效
公开(公告)号：JP2001067053A
公开(公告)日：2001-03-16
申请号：JP24352899
申请日：1999-08-30
申请人： MITSUBISHI ELECTRIC CORP
发明人： HORI YUICHIRO
IPC分类号： G09G3/04 , G01D7/00 , G01R13/00 , G01R23/165 , G09G5/00 , G10G1/00 , H03G1/00
摘要： PROBLEM TO BE SOLVED: To provide a feeling of unity between a display and a sound source (a tune), by detecting a fixed period or a sound (a tempo) continually arising at fixed time intervals from the sound source (the tune) of an audio input, and synchronizing displayed contents with the tempo of the sound source (the tune) to eliminate the regularity of the display. SOLUTION: This display device is equipped with a level detecting circuit 4 for dividing an audio signal band into a plurality of bands and taking out the level of each band, a tempo detecting circuit 6 for detecting a tempo from a sound source (a tune), and a display circuit 3 for displaying the levels of the respective bands with segments. The time for switching displayed levels to the next varied displayed levels is synchronized with the tempo by a system controller 2.

100. 发明专利

JP3135635B2 失效
公开(公告)号：JP3135635B2
公开(公告)日：2001-02-19
申请号：JP27884191
申请日：1991-09-30
IPC分类号： G01R21/133 , G01R23/165 , G01R23/167

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