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111. 发明专利

JPH0614066A RECEIVER 失效
公开(公告)号：JPH0614066A
公开(公告)日：1994-01-21
申请号：JP16956892
申请日：1992-06-26
申请人： JAPAN BROADCASTING CORP
发明人： KURODA TORU , SAITO MASANORI , MORIYAMA SHIGEKI , SAITO TOMOHIRO , TAKADA MASAYUKI , ISOBE TADASHI , YAMADA TSUKASA
IPC分类号： H04B7/26 , H04L27/14 , H04L27/22 , H04L27/227
摘要： PURPOSE:To make the reception state optimum at all times by selecting a synchronization detection circuit or a delay detection circuit having a good condition according to the state when the reception condition is not good and demodulating a detected digital signal after the selection. CONSTITUTION:A reception signal 301 is transmitted to a digital signal output section 314, and inputted to either of a synchronization detection section 307 and a delay detection section 308. A changeover switch 309 is controlled based on the result discriminated by a switching control section 306 and either of them is selected. The switching control section 306 selects either of the synchronization detection section 307 and the delay detection section 308 having an excellent characteristic (condition) based on an average level 304, a variance 305 and the measured result of a multi-path distortion measurement section 303. Moreover, the switching timing of the changeover switch 309 is based on the boundary of clocks or the boundary of packets or frames obtained from a data demodulation section 312. Thus, a bit error ratio at the switching is suppressed and optimum reception is attained against bad conditions such as fading and multi-path distortion.

112. 发明专利

JPH0559635B2 失效
公开(公告)号：JPH0559635B2
公开(公告)日：1993-08-31
申请号：JP19554381
申请日：1981-12-07
申请人： JAPAN BROADCASTING CORP
发明人： YAMADA TSUKASA
IPC分类号： H04N7/08 , H04L25/03 , H04N7/025 , H04N7/03 , H04N7/035 , H04N7/081

113. 发明专利

JPH05206902A FM MULTIPLEX BROADCASTING TRANSMISSION/RECEPTION DEVICE 失效
公开(公告)号：JPH05206902A
公开(公告)日：1993-08-13
申请号：JP1087992
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： H04B7/08 , H04H20/00 , H04H40/18 , H04H60/11 , H04H60/32 , H04L1/00 , H04L1/06
摘要： PURPOSE:To reduce the fluctuation of field intensity as to receive a signal at high sensitivity by detecting the error of the data header of a received and modulated digital signal and switching/selecting two antenna outputs based on the error. CONSTITUTION:A data header error detection circuit 9 is constituted in such a way that a switch signal is outputted when the errors more than a previously decided number as to at least one of a claiming code and a mode control code are detected. Then, the error of the header of the digital signal is detected. When the errors more than the previously decided number are detected, the detection circuit 9 outputs the switch signal. An antenna selection circuit 4 switches and selects antenna output in response to the switch signal. Thus, a system is set in an optimum reception state.

114. 发明专利

JPH05145498A AM MULTIPLEX SIGNAL RECEIVER 失效
公开(公告)号：JPH05145498A
公开(公告)日：1993-06-11
申请号：JP30179691
申请日：1991-11-18
申请人： JAPAN BROADCASTING CORP
发明人： TAKADA MASAYUKI , SAITO MASANORI , KURODA TORU , MORIYAMA SHIGEKI , SAITO TOMOHIRO , YAMADA TSUKASA
IPC分类号： H04B1/10 , H04B15/00 , H04J99/00
摘要： PURPOSE:To provide the AM multiplex signal receiver in which crosstalk disturbance in a medium wave AM broadcast is avoided to attain excellent audio signal reception and information other than an audio signal is received as a digital signal. CONSTITUTION:The receiver is provided with a frequency converter 102 converting an RF signal into an IF signal, an envelope detector 104 demodulating the IF signal to obtain an audio signal 1, a digital demodulator 106 reproducing a digital audio signal from the IF signal, a digital audio signal decoding circuit 108 reproducing an analog audio signal 2 from the demodulated digital audio signal, a signal changeover device 110 selecting either the audio signal 1 being an output of the envelope detector 104 or an audio signal 2 being an output of the digital audio signal decoding circuit 108, and a sound quality evaluation circuit 112 receiving the audio signal 1 and an error correction syndrome outputted from the digital demodulator 106, comparing each sound quality, and generating a control signal to select the signal changeover device 110.

115. 发明专利

JPH0527005A POSITION DETECTING METHOD 失效
公开(公告)号：JPH0527005A
公开(公告)日：1993-02-05
申请号：JP17828291
申请日：1991-07-18
申请人： JAPAN BROADCASTING CORP
发明人： KURODA TORU , TAKADA MASAYUKI , SAITO MASANORI , MORIYAMA SHIGEKI , SAITO TOMOHIRO , YAMADA TSUKASA
IPC分类号： G01C21/00 , G01S19/07 , G01S19/41 , G08G1/0968 , H04H20/00 , H04H60/51
摘要： PURPOSE:To obtain correct positional information on a receiver side by calculating the data to indicate the error between the known positional information and the measured positional information, and broadcasting the error data. CONSTITUTION:A GPS receiver 101 provided in a broadcasting station obtains the respective positional data 102,103,104 in terms of the latitude, the longitude and the altitude. These data include errors caused by the tracking errors, the effects of the ionized layer or the like, or the intentional errors. Thus, the errors are calculated in an error calculating part 105 by using these data and the correct position, and the error data 106, 107, 108 corresponding to the respective data are obtained. Then, these data are for example, packeted at a packeting part 110 together with measuring time data 109. The packeted error data are received by an FM multiplexing device 112 together with other data 111 for the FM multiflexed broadcasting use, and broadcasted. Other GPS receivers located in other positions realize correction of the positional data by using the error data transmitted by the broadcasting station.

116. 发明专利

JPH04264834A DIFFERENTIAL ENCODING SYSTEM 失效
公开(公告)号：JPH04264834A
公开(公告)日：1992-09-21
申请号：JP2469291
申请日：1991-02-19
申请人： JAPAN BROADCASTING CORP
发明人： MORIYAMA SHIGEKI , SAITO MASANORI , KURODA TORU , TAKADA MASAYUKI , SAITO TOMOHIRO , YAMADA TSUKASA
IPC分类号： H04B14/06 , H04J3/04
摘要： PURPOSE:To remarkably reduce the number of differential encoding circuits by obtaining the differential data of each channel time-divisionally and temporarily storing the result in a RAM. CONSTITUTION:A RAM200 stores N-channel data for fixed time, for example, for one frame. The data for each channel is successively read out by switched by a switching device 201 by two bits, and transmitted to a Gray code circuit 202. Further, the addition in a modulo 4 with the former data for each channel is performed by 811 adder 203. The initial two-bit data of each channel is inputted through the switching device 201 and Gray code circuit 202 to the adder 203. The 0 data of the initial two bit of the RAM 204 is also switched for each channel by a switching device 205, transmitted to a one symbol register 206, inputted to the adder 203. Then the addition taking modulo 4 is performed.

117. 发明专利

JPH04192813A MULTIPLEX FM BROADCASTING SIGNAL SENDING-OUT DEVICE 失效
公开(公告)号：JPH04192813A
公开(公告)日：1992-07-13
申请号：JP32124690
申请日：1990-11-27
申请人： JAPAN BROADCASTING CORP
发明人： TAKADA MASAYUKI , MORIYAMA SHIGEKI , KURODA TORU , YAMADA TSUKASA
IPC分类号： H04B1/16 , H04H20/00 , H04H20/28 , H04H20/48
摘要： PURPOSE:To improve the bit error rate and to decrease the interference to a stereo channel by delaying a stereo signal before multiplexing. CONSTITUTION:The device is provided with a series-parallel converting circuit 2. phase shifters 4, 6, multipliers 10, 12 and 14, a coupling circuit 16, a level control circuit 18, a circuit 20 consisting of a rectifying circuit and a prescribed low-pass filter(LPF), a delay circuit 22 and a stereo signal generator 24. In such a state, a stereo signal is delayed before multiplexing. A mutual time shift of the stereo signal and the multiple signal is eliminated, and at the time of rising a sum or difference signal, the multiple signal is also controlled simultaneously. In such a way, deterioration of an error rate is prevented, and also, the interference to a stereo channel is decreased.

118. 发明专利

JPH0483441A FM MULTIPLEX DIGITAL SIGNAL SENDING EQUIPMENT 失效
公开(公告)号：JPH0483441A
公开(公告)日：1992-03-17
申请号：JP19618990
申请日：1990-07-26
申请人： JAPAN BROADCASTING CORP
发明人： KURODA TORU , MORIYAMA SHIGEKI , TAKADA MASAYUKI , YAMADA TSUKASA
IPC分类号： H04L27/12 , H04H1/00 , H04H20/48
摘要： PURPOSE:To reduce noise due to ghost interruption by delaying a Q signal by a prescribed delay value from an I signal obtained by the serial/parallel conversion of a serial digital signal to adjust phases and mutually adding plural subcarriers modulated by multiplying respectively different subcarriers by respective signals. CONSTITUTION:This FM multiplex digital signal sending equipment is provided with the 1st multiplying means 302 for multiplying the 1st subcarrier delaying a Q signal by a prescribed delay value from the I signal obtained from the means 202 and having about (85.5-66.5)/2kHz by an I signal obtained from a serial/parallel conversion means 202, the 2nd multiplying means 303 for multiplying a subcarrier having a 90 deg. phase difference from the 1st subcarrier by a Q signal obtained from a delay means 205 and the 3rd multiplying means 304 for multiplying the modulated wave obtained from the means 302 by the 2nd subcarrier having 76kHz, and the modulated wave obtained from the 2nd means 303 is multiplied by a 76kHz subscarrier having 90 deg. phase difference from the 2nd subcarrier of 76kHz through the 4th multiplying means 305 and two modulated waves are added to each other. Consequently, noise to be generated due to ghost interruption can be reduced.

119. 发明专利

JPH02284527A BROADCASTING RECEIVER 失效
公开(公告)号：JPH02284527A
公开(公告)日：1990-11-21
申请号：JP10446689
申请日：1989-04-26
申请人： JAPAN BROADCASTING CORP
发明人： KURODA TORU , YAMADA TSUKASA
IPC分类号： H04B1/16
摘要： PURPOSE:To drop a threshold level by installing a band restriction means restricting the band width of an intermediate frequency and eliminating a loop which comes to be the cause of a time delay. CONSTITUTION:An FM signal which comes to the intermediate frequency passes through a band pass filter(BPF) 101. BPF can switch a pass band from about + or -150kHz to about + or -20kHz with an intermediate frequency carrier as a center. The FM signal from BPF 101 passes through a limitter 108 and a frequency discriminator 109 and it comes to a base band signal. When the band width of BPF 101 is more than + or -53 or + or -60kHz, a stereo signal and an RDS signal are demodulated. When BPF less than + or -53 or + or -60kHz is used, a switch 110 is set to a low pass filter(LPF) 102-side, and only a monoral signal less than 15kHz is outputted.

120. 发明专利

JPH02224487A DATA SIGNAL TRANSMITTER 失效
公开(公告)号：JPH02224487A
公开(公告)日：1990-09-06
申请号：JP4328289
申请日：1989-02-27
申请人： JAPAN BROADCASTING CORP
发明人： YAMADA TSUKASA , KURODA TORU
IPC分类号： H04N7/025 , H04J3/00 , H04N7/03 , H04N7/035 , H04N7/08
摘要： PURPOSE:To intensify the reproducing capability of bit synchronization and error correction by minimizing the quantity of the deviation of a head packet from a head phase through the one bit of shift for a prescribed H, and multiplexing the signal at lots of H. CONSTITUTION:In the case of application of 296-bit to each H, the bit rate is 5.6427875Mbps and the phase for each H is advanced by 0.1378-bit in the case of multiplexing for each 361-bit. When multiplexing for each 361-bit is applied as it is, the tip of a multiplex signal enters the color subcarrier. More over, multiplexing is implemented sequentially for each of 361-bit for the 7-th H by 6H and multiplexing is applied from the 362nd bit at the succeeding H, then the quantity of deviation is minimized. A required control and gate signal or the like is generated by using signals 501-504 as shown in figure and finally a byte pulse in the unit of 8-bit starting from the above mentioned phase is generated.

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