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1. 发明专利

JP2001285249A METHOD FOR GENERATING TRANSMISSION SIGNAL, AND GENERATOR FOR THE TRANSMISSION SIGNAL 失效
公开(公告)号：JP2001285249A
公开(公告)日：2001-10-12
申请号：JP2000100443
申请日：2000-04-03
申请人： VICTOR COMPANY OF JAPAN
发明人： KANEKO KEIICHI , MATSUI KAZUNARI
IPC分类号： H04L27/18 , H04J11/00 , H04L27/26 , H04L27/34
摘要： PROBLEM TO BE SOLVED: To compensate deterioration in a modulation characteristics caused by a difference from an arithmetic time between an in-phase signal and a quadrature signal from a digital orthogonal modulator. SOLUTION: The transmission signal generator is configured with a signal point setting means (12) that sets a compensation signal point to correct an error in a signal point arrangement position depending on the signal point arrangement position error caused by an arithmetic timing error of the digital orthogonal modulator, and a mapping means (11) that assigns a digital information signal to be sent on the basis of the signal point setting means. The signal generator performs a digital modulation (13) and a digital orthogonal modulation (15) on the basis of the signal point information assigned by the data mapping means.

2. 发明专利

JP2001119364A ORTHOGONAL FREQUENCY DIVISION MULTIPLEX SIGNAL TRANSMITTING SYSTEM, TRANSMITTER AND RECEIVER 失效
公开(公告)号：JP2001119364A
公开(公告)日：2001-04-27
申请号：JP2000290216
申请日：2000-09-25
申请人： VICTOR COMPANY OF JAPAN
发明人： KANEKO KEIICHI
IPC分类号： H04J11/00
摘要： PROBLEM TO BE SOLVED: To solve the problems that there is a fixed limit in much more accuracy improvement since the amplitude characteristic difference or phase characteristic difference of I signal and Q signal becomes the direct cause of code error and that a characteristic change can not be corrected while a reference signal is not transmitted. SOLUTION: On the transmitting side, the known reference signal is transmitted by a specified carrier wave among plural carrier waves composing an OFDM signal, the carrier wave for transmitting the known reference signal is designated by a symbol number to be transmitted by a prescribed carrier wave, and the reference signal is transmitted while being successively and cyclically changed at the interval of a fixed period. On the receiving side, the reference signal is demodulated by a demodulation circuit 311 and transmission line characteristics are detected by a detecting circuit 312. A first correction expression is calculated from the detected transmission line characteristics and stored by a first correction expression deriving and holding circuit 313. The signal is decoded by a first correcting circuit 314 while using this correction expression. Further, the output signal of this correcting circuit 314 is corrected by newly calculating a second correction expression so that high-speed change characteristics can be corrected.

3. 发明专利

JP2000115115A GENERATION METHOD AND DECODING METHOD FOR ORTHOGONAL MULTI-CARRIER SIGNALS 失效
公开(公告)号：JP2000115115A
公开(公告)日：2000-04-21
申请号：JP27710398
申请日：1998-09-30
申请人： VICTOR COMPANY OF JAPAN
发明人： KANEKO KEIICHI , TAKAOKA KATSUMI , MATSUI KAZUNARI , SAEKI TAKAAKI
IPC分类号： H04L27/00 , H04J11/00 , H04L27/26
摘要： PROBLEM TO BE SOLVED: To provide the generation method of orthogonal multi-carrier signals capable of generating intermittent orthogonal multi-carrier signals in inexpensive constitution and a decoding method capable of decoding the orthogonal multi- carrier signals. SOLUTION: In the case of generating the orthogonal multi-carrier signals of an intermittent type for transmitting information by the total of 128 carrier waves of every eight lines, 128-point IDFT transformation is performed and the non-intermittent-type multi-carrier signals are generated. Thus the non- intermittent-type multi-carrier signals for indicating a frequency spectrum in (A) are generated it is repeated for eight times and they are synthesized and then transferred in a prescribed symbol period. Thus, as the frequency spectrum is indicated in (B), the intermittent-type multi-carrier signals composed of the carrier waves of every eight lines are generated. Thus, by an arithmetic circuit for performing the 128-point IDFT transformation for which a point number is less than before, desired intermittent-type orthogonal multi-carrier signals are generated.

4. 发明专利

JPH11308192A METHOD AND CIRCUIT FOR GENERATING FREQUENCY DIVIDING MULTIPLEX SIGNAL 失效
公开(公告)号：JPH11308192A
公开(公告)日：1999-11-05
申请号：JP11035998
申请日：1998-04-21
申请人： VICTOR COMPANY OF JAPAN
发明人： KANEKO KEIICHI
IPC分类号： H04L27/00 , H04J11/00
摘要： PROBLEM TO BE SOLVED: To provide a method and a circuit for generating a frequency dividing multiplex signal which is operated inexpensively and also at high speed with a simple circuit configuration. SOLUTION: A dividing circuit 11 collects input data A at every two-bit and divides them into nine groups of data B1-B9 on the whole. Time axis waveform generating circuits 131-139 decide the initial address of a waveform table 12 by inputted two-bit data. The circuit 131 outputs 16 kinds of initial address data of the table 12 as they are. The circuit 132 generates a time axis waveform by reading data while updating the address at every step from the initial address of the table 12. The other circuits 133-139 respectively generate+ second to -fourth carriers. Adding circuits 14 and 15 output an I signal and a Q signal.

5. 发明专利

JPH10135924A ORTHOGONAL FREQUENCY-DIVISION MULTIPLE SIGNAL TRANSMISSION METHOD AND RECEIVER USED THEREFOR 失效
公开(公告)号：JPH10135924A
公开(公告)日：1998-05-22
申请号：JP28835596
申请日：1996-10-30
申请人： VICTOR COMPANY OF JAPAN
发明人： KANEKO KEIICHI
IPC分类号： H04L27/38 , H04J11/00 , H04L27/22
摘要： PROBLEM TO BE SOLVED: To provide an orthogonal frequency-division multiple signal transmission method by which out of symbol synchronization is minimized and the error caused by coefficient averaging between adjacent carriers is reduced, and to provide a receiver used therefor. SOLUTION: An N point discrete Fourier transmission(DFT) multi-value quadrature amplitude modulation(QAM) decoding circuit 31 decodes a symbol number and a reference signal, detects a transmission line characteristic from the reference signal, calculates a correction equation from the transmission line characteristic and stores it, obtains an integration value of an approximated value for each prescribed period by using the coefficient of the transmission line characteristic, so as to calculate an approximated value of a phase difference between a couple of carriers in a vicinity among a plurality of carriers as to each of carriers of the set number, the integration value this input is compared with the value at a preceding input and a forward signal or a backward signal is outputted, depending on the comparison result. A guard interval period processing circuit 30 adjusts it so that an integrated value of a DFT window, based on the symbol synchronization signal is adjusted based on the forward signal or the backward signal.

6. 发明专利

JPH08274750A ABNORMAL OPERATION PREVENTING CIRCUIT FOR QUADRATURE FREQUENCY-DIVISION MULTIPLEX MODULATION DEVICE 失效
公开(公告)号：JPH08274750A
公开(公告)日：1996-10-18
申请号：JP10053895
申请日：1995-03-30
申请人： VICTOR COMPANY OF JAPAN
发明人： TAKAHASHI NOBUAKI , KANEKO KEIICHI
IPC分类号： H04L27/36 , H04J11/00
摘要： PURPOSE: To provide the abnormal operation preventing circuit which initializes the operation sequence of a circuit on detecting an out-band output signal being almost generated owing to abnormality in a transmission equipment. CONSTITUTION: An IFFT circuit 3 is placed in operation at a sample clock frequency exceeding a modulated wave signal band, an input signal is set to 0 nearby a terminal of (N/2)th order where the Nyquist frequency of an IFFT circuit of Nth order (N: 2 to (m)th power, (m) plus integer) is generated to prevent frequency output nearby the Nyquist frequency, and monitors 8, 9, and 10 are so set as to monitor the level of frequency spectrum of almost (N/2)th degree, and the IFFT circuit generates a frequency demultiplex signal with a digital input signal supplied to a terminal of 0th order-almost a terminal of (N/4)th order and when a monitor detects a frequency component above a specific value nearby the terminal of (N/2)th order, the operation sequence of the IFFT circuit is initialized.

7. 发明专利

JPH08274749A QUADRATURE FREQUENCY-DIVISION MULTIPLEX SIGNAL TRANSMISSION EQUIPMENT 失效
公开(公告)号：JPH08274749A
公开(公告)日：1996-10-18
申请号：JP10021695
申请日：1995-03-31
申请人： VICTOR COMPANY OF JAPAN
发明人： TAKAHASHI NOBUAKI , KANEKO KEIICHI
IPC分类号： H04N7/08 , H04J11/00 , H04L27/36 , H04N7/081
摘要： PURPOSE: To provide a quadrature frequency-division multiplex signal transmission equipment which can easily perform calibration at the time of mobile transmission and reception. CONSTITUTION: A switch circuit 3 inputs one of digital data from an input circuit 2 and a calibration signal from a calibration signal generator 4 by switching the calibration signal in order to the input terminals of an IFFT circuit 6 consisting of output array type IDFT circuits arranged in bit-reverse order with a counted value (symbol number) from a symbol number counter 5 counting up by one, symbol by symbol. Consequently, when information data to be sent and the calibration signal for level correction are switched and transmitted while carrier numbers are determined, the numbers of the carriers for transmitting the calibration signal are specified in the bit-reverse order from the output terminal of the IFFT circuit 6.

8. 发明专利

JPH01258280A HEAD POSITIONING DEVICE FOR DISK DRIVING DEVICE 失效
公开(公告)号：JPH01258280A
公开(公告)日：1989-10-16
申请号：JP8568088
申请日：1988-04-07
申请人： VICTOR COMPANY OF JAPAN
发明人： OSADA YUTAKA , KANEKO KEIICHI
IPC分类号： G11B21/08 , G11B21/10
摘要： PURPOSE:To attain the servo of high stiffness by detecting the angular velocity of a driving shaft of a motor for carriage driving based on the output signal of an encoder and using a detecting output as the velocity control signal of a velocity control loop for carriage driving. CONSTITUTION:An encoder 11 is linked to a motor 5 for carriage driving and the angular displacement or angular velocity of the motor 5 is detected. A moire sensor 12 is formed in one body with a magnetic head and a position error is detected to a track center. The outputs of the encoder 11 and sensor 12 are processed through a switch 14 and an A/D converter 13 by a digital signal processor 15 and converted again to an analog signal. Then, the outputs are supplied to the motor 5 as a control current and following servo control is executed. Thus, even when the carriage or a gimbals sheet has a low resonance frequency, the servo system of the high stiffness can be obtained.

9. 发明专利

JPS626407A DISK DRIVING DEVICE 失效
公开(公告)号：JPS626407A
公开(公告)日：1987-01-13
申请号：JP14297685
申请日：1985-06-29
申请人： VICTOR COMPANY OF JAPAN
发明人： KANEKO KEIICHI , MIYAZAKI TAKESHI
IPC分类号： G11B5/09
摘要： PURPOSE:To improve the efficiency of a format by providing a delay means for delaying an erase gate signal for turning on/off a tonnel erase head from a write gate signal for turning on/off a recording/reproducing head by a time corresponding to respective detected outputs of a detecting means. CONSTITUTION:Respective delay lines 41-4n delay a write gate signal S2 by respective inherent delay times and output erase gate signals S1. The signals S1 are supplied to an AND gate circuit 15 to control the gate of the circuit 15. On the other hand, erase current is supplied from an erasing circuit 16 to the circuit 15 and the erase current is supplied to an E head 2 only for a period that the gate is opened to executed tonnel erasing. Thereby, the erase gate signals S1 obtained by delaying the write gate signal S2 only by the delay time in each cylinder are obtained. Consequently, the efficiency of the format is improved.

10. 发明专利

JP2002082928A RECURSIVE DISCRETE FOURIER TRANSFORMING METHOD AND RECURSIVE INVERSE DISCRETE FOURIER TRANSFORMING METHOD 审中-公开
公开(公告)号：JP2002082928A
公开(公告)日：2002-03-22
申请号：JP2001203135
申请日：2001-07-04
申请人： VICTOR COMPANY OF JAPAN
发明人： TAKAOKA KATSUMI , KANEKO KEIICHI
IPC分类号： G06F17/14
摘要： PROBLEM TO BE SOLVED: To quickly perform the Fourier transformation processing of a data column including successively supplied complex sampling data in one sampling period. SOLUTION: At the time of temporarily storing successively supplied data by acquiring the latest N complex data, and erasing the old data, the value of a difference between the recently supplied complex data value and the complex data value to be erased is acquired by a data updating part 1, and the acquired complex data value and the latest FFT arithmetic result temporarily stored in a memory part 3 are supplied to a recursive DFT arithmetic part, and those values are calculated by a prescribed method, and the FFT arithmetic results corresponding to the latest N complex data values are outputted in real time.

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