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1. 发明专利

JPH04124926A CORRELATOR 失效
公开(公告)号：JPH04124926A
公开(公告)日：1992-04-24
申请号：JP24383990
申请日：1990-09-17
申请人： FUTABA DENSHI KOGYO KK
发明人： HOSHIKUKI ATSUSHI , YAMAMOTO MITSUO , KONO RYUJI , IMAI HIDEKI
IPC分类号： H04B1/69 , H04B1/7085 , H04J13/00
摘要： PURPOSE:To correctly demodulate transmitted data by detecting the peak of a correlation signal required for demodulating the data by varying a threshold level into an optimum value according to the level of the peak value of the correlation signal. CONSTITUTION:When a threshold level control signal is inputted to threshold detection circuit 4 from a threshold level decision circuit 9, its threshold level Ls (-Ls) is varied and controlled so as to be an optimum level for the peak value detected by a peak detection circuit 6. In case that dispersion arises in detected output waveform because of the variation of the amplitude or the frequency of a modulated transmission signal, and the level of the correlation signal Vo is lowered as a whole, the threshold level Ls (-Ls) is averaged on the basis of a peak detection signal S2 detected at that time, and it is varied and set into the threshold level to meet the level of the correlation signal Vo at that time. Accordingly, the data can correctly be demodualted, and reliability can be improved.

2. 发明专利

JP2581441B2 失效
公开(公告)号：JP2581441B2
公开(公告)日：1997-02-12
申请号：JP9794594
申请日：1994-04-13
申请人： FUTABA DENSHI KOGYO KK
发明人： SAKURAI KYOKAZU , HOSHIKUKI ATSUSHI , FUKAZAWA SHOJI
IPC分类号： E06B9/56 , H04Q9/00

3. 发明专利

JPH08223231A DIGITAL DATA TRANSMITTER, RECEIVER AND DIGITAL DATA COMMUNICATION SYSTEM 失效
公开(公告)号：JPH08223231A
公开(公告)日：1996-08-30
申请号：JP5199495
申请日：1995-02-17
申请人： FUTABA DENSHI KOGYO KK
发明人： ISHII SATOSHI , HOSHIKUKI ATSUSHI
IPC分类号： H04L27/10 , H04L7/00 , H04L7/10 , H04L27/22
摘要： PURPOSE: To improve a reception threshold level and to reduce a multi-path fault by providing an output of preamble data comprising specific code data synchronously with a timing pulse. CONSTITUTION: A clock frequency divider 202 frequency-divides a inputted reference clock signal and outputs a timing pulse specifying a bit timing of transmission data. A timing pulse outputted from the clock frequency divider 202 is also fed to a preamble data generating circuit 204, which outputs a PN code in a timing specified by the timing pulse. The correlation is detected with high accuracy by adopting the PN code having a steep autocorrelation characteristic as the preamble data and each bit in the received data signal is accurately separated. Thus, high data decoding performance is obtained even when noise due to deteriorated S/N or multi-path is intruded in the received bits.

4. 发明专利

JPH04124925A CORRELATOR 失效
公开(公告)号：JPH04124925A
公开(公告)日：1992-04-24
申请号：JP24383890
申请日：1990-09-17
申请人： FUTABA DENSHI KOGYO KK
发明人： HOSHIKUKI ATSUSHI , YAMAMOTO MITSUO , KONO RYUJI , IMAI HIDEKI
IPC分类号： G06F3/05 , H04B1/7085 , H04J13/00
摘要： PURPOSE:To correctly demodulate transmitted data without being influenced by time difference due to a clock signal by varying and setting detecting time for detecting the peak value of a main lobe appearing at a definite period by a correlation signal obtained by correlation between a DS signal and the same diffusion code as a transmitting side. CONSTITUTION:After every data d0 to dN-1 stored in a shift register 1 is multiplied successively by the same diffusion codes P0 to PN-1 as the transmitting side by a multiplier 2, it is summed successively by a first adder 3, and the correlation signal Vo equivalent to a base band signal is outputted from this first adder 3. At the time of the demodulation of the data, a window setting circuit 6 which can be varied and set by the count value of a counter 6a is provided, and the peak value of the correlation signal Vo exceeding a threshold level Ls (-Ls) is detected while a window is kept in an ON-state. Thus, even if the deviation of the timing arises between the clock signals of the transmitting side and a receiving side, the peak value of the main lobe in the correlation signal Vo can be detected as leaving a margin in the detecting time to some extent, and the data always can stably be demodulated, and reliability is improved.

5. 发明专利

JPH0447728A CORRELATION DEVICE 失效
公开(公告)号：JPH0447728A
公开(公告)日：1992-02-17
申请号：JP15533790
申请日：1990-06-15
申请人： FUTABA DENSHI KOGYO KK
发明人： HOSHIKUKI ATSUSHI , YAMAMOTO MITSUO
IPC分类号： H04J13/00 , H04B1/709
摘要： PURPOSE:To accurately demodulate a sent data by providing a means which controls variably a threshold level at the detection of a correlation signal in response to the peak level of the correlation signal obtained through the correlation between a DS signal and the dame spread code as that at a treansmission side. CONSTITUTION:When a DS signal subjected to spread processing of an information data by using a spread code is sent from the transmission side, a threshold level at the detection of a correlation signal is variably controlled in response to the peak level of the correlation signal obtained through the correlation between a DS signal and a same spread code as that at the transmission side. Thus, a threshold level deciding circuit 9 compares the level of a peak detection signal S2 from a peak detection circuit 6 with a threshold level Ls(-Ls) and outputs a threshold level control signal S4 to apply variable control to a threshold level in response to the level of the detected peak detection signal S2 to a threshold level detection circuit 4. Thus, the sent data is accurately demodulated and the reliability is improved.

6. 发明专利

JPH0447727A CORRELATION DEVICE 失效
公开(公告)号：JPH0447727A
公开(公告)日：1992-02-17
申请号：JP15533690
申请日：1990-06-15
申请人： FUTABA DENSHI KOGYO KK
发明人： HOSHIKUKI ATSUSHI , YAMAMOTO MITSUO
IPC分类号： H04J13/00 , H04B1/709
摘要： PURPOSE:To accurately demodulate a sent data by providing a means which sets variably a detection time to detect a peak value of a main lobe appearing at a prescribed period with a correlation signal obtained through the correlation between a DS signal and the same spread code as that at a transmission side. CONSTITUTION:The correlation device decodes a DS signal subjected to a spread processing with a PN code from an information data from a transmission side and is provided with a shift register 1, a multiplier 2, a 1st adder 3, a threshold level detection circuit 4, a peak detection circuit 5, a window setting circuit 6, a state discrimination circuit 7, a 1st switch circuit 8, a 2nd switch circuit 9, a switch changeover circuit 10, an output device 11, a 2nd adder 12 and a decoder 13. When the DS signal subjected to spread processing with the PN code from the information data is sent from the transmission side and received and detected, the peak level of a main lobe in a correlation signal appearing at a prescribed period is detected within a detection time set variably within a prescribed range. Thus, the main lobe in the correlation signal is detected without being affected with a time difference by the clock signal between the transmission and reception and the sent data is accurately demodulated.

7. 发明专利

JPH0832485A SPREAD SPECTRUM COMMUNICATION SYSTEM 失效
公开(公告)号：JPH0832485A
公开(公告)日：1996-02-02
申请号：JP18197494
申请日：1994-07-12
申请人： FUTABA DENSHI KOGYO KK
发明人： ISHII SATOSHI , HOSHIKUKI ATSUSHI
IPC分类号： H04B1/69 , H04B1/692 , H04B1/7097 , H04B1/719
摘要： PURPOSE:To provide the spread spectrum communication system in which the error rate is not increased even on the occurrence of a hit without decreasing the transmission speed. CONSTITUTION:Plural input data subject to DS modulation by a DS spread communication system are given to an arrangement converter 4, only each 1st chip of data are collected to generate an FH 1st frame and 2nd and 7th chips only are collected respectively to generate FH 2nd to FH 7th frames. The FH frame is subject to FH modulation by an FH spread multiplier 6 and the resulting frame is sent. The data are FH-demodulated and restored to the original data arrangement by an inverse arrangement converter 11 to convert a burst error into a random error.

8. 发明专利

JPH07284163A INDUSTRIAL RADIO-CONTROLLED RECEIVER 失效
公开(公告)号：JPH07284163A
公开(公告)日：1995-10-27
申请号：JP9794594
申请日：1994-04-13
申请人： FUTABA DENSHI KOGYO KK
发明人： SAKURAI KIYOKAZU , HOSHIKUKI ATSUSHI , FUKAZAWA SHOJI
IPC分类号： E06B9/56 , H04Q9/00
摘要： PURPOSE:To provide the industrial radio controlled receiver by which the setting revision of on/off control operation is made freely by the user or the like. CONSTITUTION:Suppose that a transmission button 1-1 of a CH 1 is operated, then a radio wave modulated by a modulation signal including a channel code of the CH 1 is sent. Upon the receipt of the radio wave by a radio-controlled receiver 10, the radio wave is amplified and detected in a high frequency circuit 4 and fed to a decoder circuit 5. An operation setting dip switch 6 is used to set whether momentary operation is implemented to the CH 1 or latch operation is made and the decoder circuit 5 outputs the setting operation ON/OFF control signal to an output circuit 7. The output circuit 7 outputs the momentary operation or the latch operation ON/OFF control output signal set to an output terminal 7-1 of the CH 1.

9. 发明专利

JPH0447726A SPREAD SPECTRUM COMMUNICATION SYSTEM 失效
公开(公告)号：JPH0447726A
公开(公告)日：1992-02-17
申请号：JP15533590
申请日：1990-06-15
申请人： FUTABA DENSHI KOGYO KK
发明人： YAMAMOTO MITSUO , HOSHIKUKI ATSUSHI
IPC分类号： H04B1/713 , H04B1/692 , H04B1/7156 , H04J13/00
摘要： PURPOSE:To improve the data error rate characteristic by applying hopping at the interval equal to one period of direct spread signal for at least one frequency in one period of frequency hopping and applying synchronization acquisition of the frequency hopping according to the output timing of a correlation output at hopping. CONSTITUTION:At least one frequency is subjected to hopping at the interval equal to one period of a direct spread signal during one period of the frequency hopping and the switching period of the hopping is controlled by the output signal of a correlation device 105 to obtain synchronization. That is, the correlation device 105 takes correlation between the output signal of a mixer 102 and a pseudo noise (PN) code to output a correlation signal. Thus, synchronization is attained and even when disturbance takes place in a frequency due to external noise or the like, the rate occupied by disabled data demodulation due to the frequency is less and the error rate characteristic is improved.

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