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21. 发明专利

JPH0851408A METHOD AND DEVICE FOR REPRODUCING REFERENCE CARRIER FREQUENCY FOR DEMODULATING OFDM MODULATION SIGNAL 失效
公开(公告)号：JPH0851408A
公开(公告)日：1996-02-20
申请号：JP18706894
申请日：1994-08-09
申请人： JAPAN BROADCASTING CORP
发明人： MORIYAMA SHIGEKI , SAITO MASANORI , NAKAHARA SHUNJI , TSUCHIDA KENICHI , SASAKI MAKOTO , YAMAZAKI SHIGERU
IPC分类号： H04J11/00
摘要： PURPOSE:To highly accurately and stably reproduce reference carrier frequency for demodulating an OFDM modulation signal. CONSTITUTION:A reference carrier frequency locking carrier signal consisting of two frequency bands fA (= a.fd)+fIF, fB (= b.fd) +fIFO ((a) and (b) are mutually different natural numbers, fd is the carrier frequency interval of an OFDM and fIF is reference carrier frequency) is arranged inside or outside an OFDM modulation signal band and transmitted, and on the receiving side, respective frequency bands fA+FIF and FB+FIF of the received reference frequency locking carrier signal are respectively multiplied by reference carrier frequency fIF 108 obtained from a voltage controlling oscillator 105 constituting a phase lock loop as an oscillation output signal from the oscillator 105 to obtain a base band signal (fA, fB) and a correction value epsilon (= fA-(a/b).fB) is generated from the base band signal through a multiplier 119 and a phase comparator 122 and the generated correction value is impressed to a control signal input terminal of the oscillator 105.

22. 发明专利

JPH07321766A MODULATION DEMODULATION SYSTEM AND TRANSMITTER-RECEIVER 失效
公开(公告)号：JPH07321766A
公开(公告)日：1995-12-08
申请号：JP11656494
申请日：1994-05-30
申请人： JAPAN BROADCASTING CORP
发明人： SAITO MASANORI
IPC分类号： H04J11/00
摘要： PURPOSE:To considerably reduce the bit error rate of received data by selecting optimum data for demodulation reference data at all times even under any condition of the reception form of a receiver or the fluctuation state of a transmission line. CONSTITUTION:After a transmitter inserts reference data between plural effective data, the data are converted into the OFDM signal of a radio frequency and the signal is sent, a receiver 11 receives the OFDM signal to recover a base band time base waveform so as to discriminate the moving/stationary state of the receiver 11 and the state of a transmission line based on the reference data in the base band time base waveform and proper demodulation reference data are generated based on the result of discrimination and the amplitude and phase of the effective data in the base band time base waveform are discriminated based on the demodulation reference data to estimate the effective data.

23. 发明专利

JPH05244048A 失效
公开(公告)号：JPH05244048A
公开(公告)日：1993-09-21
申请号：JP3938792
申请日：1992-02-26
申请人： JAPAN BROADCASTING CORP
发明人： TAKADA MASAYUKI , SAITO MASANORI , KURODA TORU , MORIYAMA SHIGEKI , SAITO TOMOHIRO , ISOBE TADASHI , YAMADA TSUKASA
IPC分类号： H04B1/10 , H04B7/08 , H04H20/00 , H04H20/28 , H04H60/13 , H04H1/00
摘要： PURPOSE:To eliminate the generation of an error even at the time of diversity antenna switching and to secure the reception quality by switching multiplexed digital signals at the timing of a clock signal when an antenna input is selected. CONSTITUTION:An FM radio wave is received and converted into an IF signal, IF level detecting circuits 104 and 204 detect input levels, and a level comparator 108 compares the levels to select the higher level. The output composite signals of FM demodulating circuits 106 and 206, on the other hand, are selected by a switching circuit 114 and a digital signal is extracted from the selected signal and demodulated by a digital demodulating circuit 116. A clock regenerating circuit 112 regenerates the clock signal from the circuit 116 and outputs it. A timing control circuit 110 outputs an antenna switching control signal at the timing of the circuit 112 and the circuit 114 switches the antenna input. Consequently, the reception quality can be secured without generating any error due to antenna switching.

24. 发明专利

JPH05206788A FM MULTIPLEX BROADCAST RECEIVING DEVICE 失效
公开(公告)号：JPH05206788A
公开(公告)日：1993-08-13
申请号：JP1087892
申请日：1992-01-24
申请人： SHARP KK , JAPAN BROADCASTING CORP
发明人： MATSUMOTO YASUMASA , KOBAYASHI SADAO , TAKADA MASAYUKI , SAITO TOMOHIRO , KURODA TORU , MORIYAMA SHIGEKI , SAITO MASANORI , YAMADA TSUKASA , ISOBE TADASHI
IPC分类号： H03J7/18 , H04B1/16 , H04H20/00 , H04H20/28 , H04H40/18 , H04H60/12 , H04H60/32 , H04H60/43
摘要： PURPOSE:To automatically select a broadcasting station of a better receiving condition in accordance with movement of a car by selecting another station via one of both tuner parts based on the frequency data on the substitute station if the error of a data header which is demodulated at the other tuner part exceeds a prescribed level. CONSTITUTION:A microcomputer 11 mounted in an on-vehicle radio receiver 1 outputs the control voltage to the PLL circuits 9 and 10 in response to the channel selecting operations. The tuner parts 4 and 5 receive the same broadcasting station. Meanwhile a selecting circuit 6 selects one of both parts 4 and 5 and demodulates it. When the error of a data header which is detected by a data header error detecting circuit 12 exceeds a prescribed level, the microcomputer 11 receives another broadcasting station through the other tuner part based on the substitute frequency data. In such a way, both parts 4 and 5 receive the same station when a station where the data header error is less than a prescribed level is detected. Thus the stations can be automatically selected according to the movement of a car.

25. 发明专利

JPH05167633A DIGITAL TRANSMISSION SYSTEM 失效
公开(公告)号：JPH05167633A
公开(公告)日：1993-07-02
申请号：JP32892891
申请日：1991-12-12
申请人： JAPAN BROADCASTING CORP
发明人： SAITO MASANORI , KURODA TORU , MORIYAMA SHIGEKI , SAITO TOMOHIRO , TAKADA MASAYUKI , YAMADA TSUKASA
IPC分类号： H04L27/34 , H04J11/00 , H04L27/18 , H04N7/08 , H04N7/081
摘要： PURPOSE:To increase a transmission capacity of an OFDM while minimizing the deterioration in a bit error rate characteristic due to the effect of crosstalk or the like and to attain digital TV broadcast within a width of a band of an existing-channel of a TV broadcast by selecting kinds of 8 or more signal points and sending data of 3-bit or more with one transmission symbol of a carrier. CONSTITUTION:A transmission data allocating current 13 for each carrier allocates a digital signal by one transmission symbol of data subjected to interleaving to plural carriers. Digital data allocated to each carrier are converted into a complex number in response to the bit pattern by a data generating circuit 14 on the frequency axis. The absolute value and the argument of a signal point on a complex plane correspond to the amplitude and the phase taken by each carrier. The frequency axis data generating circuit 14 applies octal phase PSK modulation to each carrier and 3-bit data per one signal point are sent.

26. 发明专利

JPH04296129A DIGITAL SIGNAL TRANSMITTER 失效
公开(公告)号：JPH04296129A
公开(公告)日：1992-10-20
申请号：JP6042291
申请日：1991-03-25
申请人： JAPAN BROADCASTING CORP
发明人： MORIYAMA SHIGEKI , SAITO MASANORI , KURODA TORU , SAITO TOMOHIRO , TAKADA MASAYUKI , YAMADA TSUKASA , KAWAMOTO TARO
IPC分类号： H04J3/00 , H04J1/00 , H04J9/00 , H04J11/00 , H04L27/18
摘要： PURPOSE:To attain stable signal transmission while avoiding deterioration in a multiplex signal even in a transmission line system whose quality is deteriorated by applying balanced modulation to a signal subjected to base band modulation with a carrier orthogonal to a video signal and multiplexing the result onto the video signal. CONSTITUTION:A television video signal 100 is subjected to balanced modulation at a balanced modulation circuit 102 by using an output of a video carrier generating circuit 101. Plural carriers modulated by using a multiplex digital signal 103 are used to modulate the input by a QPSK modulator 104. Moreover, the QPSK of the plural carriers being an output of a signal synthesis circuit 112 is subjected to balanced modulation at a balanced modulation circuit 114 by using the carrier from a phase shift circuit 113 orthogonal to the carrier of the video signal. Then the signal applying balanced modulation to the video signal 100, a signal 116 resulting from adding carriers, and a signal balanced- modulated by the circuit 114 are synthesized by a signal synthesis circuit 115 to multiplex the digital signal onto the video signal.

27. 发明专利

JPH0439790A IC CARD SYSTEM 失效
公开(公告)号：JPH0439790A
公开(公告)日：1992-02-10
申请号：JP14607990
申请日：1990-06-06
申请人： JAPAN BROADCASTING CORP , HITACHI MAXELL
发明人： KIMURA TAKESHI , SAITO MASANORI , YOSHIMURA TOSHIRO , NANBA SEIICHI , TAKAMORI HIROSHI , KODERA YUJI , KITSUTA KENICHI
IPC分类号： B42D15/10 , G06K17/00
摘要： PURPOSE:To allow the IC card system to correspond to a communication system such as a broadcast system, as well by providing a transmission line of a data clock between a reader/writer and an IC card so that a data communication by a clock synchronizing system can be executed, and setting the data clock to a unidirectional transmission extending from the reader/writer side to the IC card. CONSTITUTION:A transmission line 19 of a data clock is provided between a reader/ writer 17 and an IC card 18 so that a data communication by a clock synchronizing system can be executed, and also, the data clock is set to a unidirectional transmission extending from the reader/writer 17 to the IC card 18. Accordingly, a data transmission rate between the reader/writer 17 and the IC card 18 is enhanced remarkably. Also, since the data clock is sent only to the IC card 18 side from the reader/writer 17 side, the data transmission to the IC card 18 from the reader/writer 17 and the data transmission to the reader/writer 17 from the IC card 18 are controlled by the reader/ writer 17 side. In such a way, when the IC card system is applied to a broadcast communication system, the IC card 18 can be controlled in one direction from the broadcast communication system side, and it conforms to the broadcast communication system.

28. 发明专利

JPH0426239A SIGNAL CONVERTER 失效
公开(公告)号：JPH0426239A
公开(公告)日：1992-01-29
申请号：JP13026590
申请日：1990-05-22
申请人： JAPAN BROADCASTING CORP
发明人： YAMADA TSUKASA , SAITO MASANORI , KURODA TORU , MORIYAMA SHIGEKI , TAKADA MASAYUKI
IPC分类号： H04J1/00
摘要： PURPOSE:To transmit a sound or a data service signal having the completely same capacity as a satellite broadcasting by a CATV or the like by limiting the band of a video signal and converting a sound signal to a signal caused by a carrier away from the main carrier frequency of the video signal. CONSTITUTION:Satellite broadcasting receivers 301 and 302 output an inputted satellite broadcasting signal 300 after converting it to digital signals 303 and 305 and on the other hand, video signals 304 and 306 having about 4.5MHz band width are demodulated and outputted. Digital signal conversion circuits 307 and 308 convert the digital signals 303 and 305 to 16 QAM signals 312 and 314 in the respective channels of the CATV and output them. Picture processing parts 309 and 310 output the video signals 304 and 306 after limiting the band to 4.18MHz for the normal ground system video signal. VSBAM modulators 316 and 317 execute VSBAM modulation to the band-limited video signals outputted from the picture processing parts 309 and 310 with the respective channels of the CATV as the carriers and output those signals. Thus, without enlarging the band width, the video signal and the digital signal similar to the same channel satellite broadcasting signal can be transmitted in the transmission system of the CATV or the like.

29. 发明专利

JPH0218783B2 失效
公开(公告)号：JPH0218783B2
公开(公告)日：1990-04-26
申请号：JP24218483
申请日：1983-12-23
申请人： JAPAN BROADCASTING CORP
发明人： NANBA SEIICHI , YAMANE KYUKICHI , YOSHINO TAKEHIKO , KAWAI NAOKI , SAITO MASANORI
IPC分类号： G06F21/24 , H04H20/00 , H04H20/76 , H04H60/15 , H04H60/23 , H04H60/98 , H04L9/00 , H04L9/08

30. 发明专利

JPH01220925A CONTROL SOFTWARE UPDATING SYSTEM 失效
公开(公告)号：JPH01220925A
公开(公告)日：1989-09-04
申请号：JP4421888
申请日：1988-02-29
申请人： JAPAN BROADCASTING CORP
发明人： SAITO MASANORI , KIMURA TAKESHI , NANBA SEIICHI
IPC分类号： H04K1/00 , G06F9/445 , G06F13/00 , H04B1/16 , H04H20/00 , H04H20/91 , H04H60/25 , H04L1/00 , H04L9/12 , H04L9/14 , H04L9/16 , H04L9/36 , H04L29/06 , H04L29/08
摘要： PURPOSE:To update the reception algorithm of a broadcast receiver even after the start of the system operation by sending data to check the content of new control software and whether or not the content is in error and data to start the new control software to a receiver through a digital signal transmission line. CONSTITUTION:Thus, an entire program check bit 26 to check whether or not the entire new control software or part of the content has an error, a check start address 24 representing the range of a check address, a check end address 25, a start address 23 representing an address to start a new control software are added with an identification bit 18, a type bit 19 and a packet check bit 22 similarly to a program data packet, a start packet 17 is formed and a satellite broadcast data channel is used and sent while being multiplexed with the broadcast wave. Thus, the new receiver control software is started from the memory address, and, the receiver control software is easily revised to change the function of the receiver.

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