-
公开(公告)号：US5398080A
公开(公告)日：1995-03-14
申请号：US70751
申请日：1993-06-03
申请人： Seiji Sakashita , Hiroaki Ozeki , Ippei Kanno , Daisuke Hayashi
发明人： Seiji Sakashita , Hiroaki Ozeki , Ippei Kanno , Daisuke Hayashi
CPC分类号： H04N5/4446 , H03D3/007 , H03D7/165 , H03B2201/0208 , H03B5/1805 , H03D7/18
摘要： In a television receiver in which image frequency signals for desired signals are removed when television broadcasting signals are frequency-converted through a local oscillator and mixers, the local oscillator generates biaxial orthogonal signals to be frequency-converted by respective mixers, an output signal of one mixer being phase-shifted to be added to an output signal of the other mixer so as to thereby offset only the image frequency signals. The local oscillator and a phase shifter operate so as to follow the frequency change of the intermediate frequency signal so as to thereby stabilize the suppression of the image frequency signal.
摘要翻译： 在电视接收机中，当电视广播信号通过本地振荡器和混频器进行频率转换时，所需信号的图像频率信号被去除，本地振荡器产生双轴正交信号，由各个混频器进行频率转换，输出信号为1 混频器被相移以被添加到另一个混频器的输出信号，从而仅偏移图像频率信号。 本地振荡器和移相器工作以跟随中频信号的频率变化，从而稳定图像频率信号的抑制。
-
公开(公告)号：US5239379A
公开(公告)日：1993-08-24
申请号：US915552
申请日：1992-07-20
申请人： Yoshio Abe , Seiji Sakashita , Ippei Kanno , Hiroaki Ozeki
发明人： Yoshio Abe , Seiji Sakashita , Ippei Kanno , Hiroaki Ozeki
CPC分类号： H04N5/211 , H04N11/004 , H04N5/46
摘要： A television signal receiving apparatus receives a new standard television broadcasting signal in an environment in which conventional standard television broadcasting signals are present. A first tuner coupled to a first antenna extracts a first television signal which contains a new standard television signal and a conventional standard television signal of the specific channel at a first ratio, and a second tuner coupled to a second antenna extracts a second television signal which contains the new standard television signal and the conventional standard television signal of the specific channel at a second ratio. In an operation unit, a multiplier multiples the second television signal by a predetermined coefficient, and a subtracter subtracts an output signal of the multiplier from the first television signal. An output signal of the subtracter becomes the new standard television signal when the coefficient has a specific value.
-
公开(公告)号：US5535220A
公开(公告)日：1996-07-09
申请号：US182830
申请日：1994-01-19
申请人： Ippei Kanno , Seiji Sakashita , Hiroaki Ozeki , Daisuke Hayashi , Todd S. Bowser
发明人： Ippei Kanno , Seiji Sakashita , Hiroaki Ozeki , Daisuke Hayashi , Todd S. Bowser
CPC分类号： H04L1/0071 , H03M13/271 , H03M13/276 , H03M13/33 , H04L1/0042 , H04L1/0054 , H04L7/048
摘要： A forward error correcting transmitter and receiver for preventing the erroneous detection of synchronization is provided in a system in which synchronization of an interleaver circuit and a deinterleaver circuit, to be inserted between a convolutional encoder and a Viterbi decoder, is obtained from a synchronization detecting circuit of the Viterbi decoder. A LFSR (Linear Feedback Shift Register) is used as a row-direction address counter during writing and an up/down counter is used as a column-direction address counter during reading, during the interleaver circuit. In the deinterleaver circuit, an up/down counter is used as the column-direction address counter during writing, and an LFSR is used as the row-direction address counter during reading.
摘要翻译： 在从同步检测电路获得插入卷积编码器和维特比译码器之间的交错器电路和去交织器电路的同步的系统中，提供了用于防止同步错误检测的前向纠错发送器和接收器 的维特比解码器。 在写入期间，LFSR（线性反馈移位寄存器）用作行方向地址计数器，并且在交织器电路期间，在读取期间将升/降计数器用作列方向地址计数器。 在去交错电路中，在写入期间使用升/减计数器作为列方向地址计数器，在读取期间使用LFSR作为行方向地址计数器。
-
公开(公告)号：US5134707A
公开(公告)日：1992-07-28
申请号：US600988
申请日：1990-10-23
申请人： Seiji Sakashita , Hiroaki Ozeki , Ippei Kanno
发明人： Seiji Sakashita , Hiroaki Ozeki , Ippei Kanno
CPC分类号： H03D3/244 , H03D3/242 , H04B1/1638
摘要： Radio waves used in broadcasting and communications making use of broadcasting satellite and communication satellite are FM signals, and the frequency shift and exclusive bandwidth vary depending on the modulation signal. The satellite broadcasting receiver is designed to control the frequency shift so that the amplitude of the demodulation signal is constant, thereby making the bandwidth of the intermediate frequency filter, so as to be capable of receiving using just one filter. At this time, the frequency shift can be controlled continuously, from large to small one, in a predetermined exclusive bandwidth. When further expanding the frequency shift, since the exclusive bandwidth is extended, the noise electric power is increased and the receiving sensitivity is lowered as compared with the exclusive machine. Accordingly, when expanding the frequency shift, the noise bandwidth is narrowed in the PLL demodulator, thereby enhancing the receiving sensitivity.
-
公开(公告)号：US5014349A
公开(公告)日：1991-05-07
申请号：US397451
申请日：1989-08-14
申请人： Kazuhiko Kubo , Akira Usui , Seiji Sakashita , Hiroaki Ozeki , Ippei Kanno
发明人： Kazuhiko Kubo , Akira Usui , Seiji Sakashita , Hiroaki Ozeki , Ippei Kanno
摘要： The invention relates to a television receiving tuner for receiving television signals of VHF band/UHF band, a CATV signal, and a satellite television broadcasting signal. As a circuit for receiving the television signals of the VHF band/UHF band and the CATV signal as a first input signal, there is provided a double super type tuner of the up/down converter system including a first local oscillator (6) and a first mixer (5) which construct an up converter and a second local oscillator (10) and a second mixer (9) which construct a down converter. When the satellite television broadcasting signal as a second input signal is received, the first local oscillator (6) and the first mixer (5) in the up converter section are switched by switching circuits (12, 13) and used as a down converter. At least the first local oscillator (6) and the first mixer (5) are commonly used both for reception of the television signals of the VHF band/UHF band and the CATV signal and for reception of the satellite television broadcasting signal, thereby accomplishing the simplification of the construction and the low costs.
摘要翻译： PCT No.PCT / JP88 / 01313 Sec。 371日期1989年8月14日 102（e）日期1989年8月14日PCT提交1988年12月23日PCT公布。 出版物WO89 / 06072 日期：1989年6月29日。本发明涉及一种用于接收VHF频带/ UHF频带的电视信号，CATV信号和卫星电视广播信号的电视接收调谐器。 作为用于接收VHF频带/ UHF频带的电视信号和CATV信号作为第一输入信号的电路，提供了一种上/下变换器系统的双超型调谐器，包括第一本地振荡器（6）和 第一混频器（5），其构造升压转换器和构成下变频器的第二本地振荡器（10）和第二混频器（9）。 当接收到作为第二输入信号的卫星电视广播信号时，上变频器部分中的第一本地振荡器（6）和第一混频器（5）由开关电路（12,13）切换并用作下变频器。 至少第一本地振荡器（6）和第一混频器（5）通常用于接收VHF频带/ UHF频带的电视信号和CATV信号，并且用于接收卫星电视广播信号，从而完成 简化施工和低成本。
-
公开(公告)号：US5061999A
公开(公告)日：1991-10-29
申请号：US268966
申请日：1988-11-09
申请人： Seiji Sakashita , Hiroaki Ozeki , Ippei Kanno , Yoshio Abe
发明人： Seiji Sakashita , Hiroaki Ozeki , Ippei Kanno , Yoshio Abe
CPC分类号： H04N7/015 , H04N11/008 , H04N7/045 , H04N7/08
摘要： A signal of the same frequency band as an ordinary NTSC signal of the video signals is transmitted with the conventional frequency band but the other frequency components are frequency-converted to a frequency higher than the sound subcarrier as the multiplex signal. The ordinary video signal, sound subcarrier and multiplex signal are frequency-multiplexed and the main carrier is transmitted by angle modulation as the modulation signal. In this case, as the multiplex signal, a signal other than the ordinary signal may directly be frequency-multiplexed and the signal may be multiplexed. Using amplitude or angle modulation to improve the demodulation accuracy or S/N through the angle modulation. The ordinary signal is regenerated like in the conventional system, without influence on the conventional receiver. In addition, since the ordinary video signal and the multiplex signal are separated in the frequency band, these may be used as the independent new transmission bands. Therefore, information other than the video signal can also be transmitted.
摘要翻译： 与传统频带一起发送与视频信号的普通NTSC信号相同的频带的信号，但是其他频率分量被频率转换为高于声音副载波的频率作为多路复用信号。 普通视频信号，声音副载波和多路复用信号被频率复用，主载波通过角度调制发送作为调制信号。 在这种情况下，作为复用信号，除了普通信号之外的信号可以直接进行频率复用，并且信号可以被多路复用。 使用幅度或角度调制通过角度调制来提高解调精度或S / N。 普通信号像常规系统一样被再生，而不影响传统的接收机。 此外，由于普通视频信号和多路复用信号在频带中被分离，所以它们可以用作独立的新的传输频带。 因此，也可以发送视频信号以外的信息。
-
公开(公告)号：US4939789A
公开(公告)日：1990-07-03
申请号：US145872
申请日：1988-01-20
申请人： Seiji Sakashita , Hiroaki Ozeki , Ippei Kanno
发明人： Seiji Sakashita , Hiroaki Ozeki , Ippei Kanno
IPC分类号： H03D5/00
CPC分类号： H03D5/00
摘要： A signal receiver which is capable of receiving and demodulating a satellite broadcasting signal which is an FM signal and a terrestrial broadcasting signal which is an AM signal is disclosed. FM and AM signals are frequency-converted into signals having frequencies in a same intermediate frequency band by making common use of a radio frequency amplifier, a mixer, a local oscillator and an intermediate frequency filter. At the time of reception of an FM signal, the FM signal is demodulated in a phase-locked loop circuit, and a local oscillator is subjected to frequency modulation by a part of the demodulated signal, thereby constituting an FM negative feedback loop, and thus narrowing the occupied bandwidth of the FM signal. At the time of reception of an AM signal, the phase-locked loop circuit is used to regenerate a carrier, and the output signal of the phase-locked loop circuit is input to a multiplier to effect synchronous detection of the input signal. At this time, the FM negative feedback to the local oscillator is utilized to effect automatic frequency control, thereby achieving stabilization of the synchronous detection.
-
公开(公告)号：US5914983A
公开(公告)日：1999-06-22
申请号：US523913
申请日：1995-09-06
CPC分类号： H04L25/0305 , H04L2025/03662
摘要： A digital signal error reduction apparatus of the present invention tracks and reduces both quickly changing errors and static errors in a digital signal which are caused by time variant multipath distortion, co-channel interference, and other transmission path interferences, including nonlinear distortion. A transversal filter is implemented for filtering the digital signal. A error detection device is implemented for calculating an error of the digital signal. A coefficient engine device is used for receiving the digital signal and the error, for extracting the error, and for updating a tap coefficient for the transversal filter so that the error is minimal.
摘要翻译： 本发明的数字信号误差减少装置跟踪并减少由时变多径失真，同信道干扰以及包括非线性失真的其它传输路径干扰引起的数字信号中的快速变化的误差和静态误差。 实现了对数字信号进行滤波的横向滤波器。 实施用于计算数字信号的误差的误差检测装置。 系数引擎装置用于接收数字信号和误差，用于提取误差，并用于更新横向滤波器的抽头系数，使得误差最小。
-
公开(公告)号：US4987606A
公开(公告)日：1991-01-22
申请号：US287088
申请日：1988-12-21
申请人： Hiroaki Ozeki , Seiji Sakashita , Ippei Kanno
发明人： Hiroaki Ozeki , Seiji Sakashita , Ippei Kanno
CPC分类号： H03G9/02 , H04B2001/0416
摘要： There is provided a wide band transmission system which, by using two or more filters and gain control circuits, is operated so as to determine the gain control amount of the gain control circuits according to an intensity and frequency band of a signal which is desired to be received. Further, a bias circuit increases the attenuation amount of the gain control circuit connected to the filter whose pass band is out of the band of the desired signal.
摘要翻译： 提供了一种宽带传输系统，其通过使用两个或更多个滤波器和增益控制电路被操作，以便根据期望的信号的强度和频带来确定增益控制电路的增益控制量 被接收。 此外，偏置电路增加了连接到通带超出期望信号的频带的滤波器的增益控制电路的衰减量。
-
公开(公告)号：US5241538A
公开(公告)日：1993-08-31
申请号：US637649
申请日：1991-01-04
申请人： Ippei Kanno , Seiji Sakashita
发明人： Ippei Kanno , Seiji Sakashita
摘要： Satellite transmission sometimes uses a method of modulating by a sub signal a subcarrier with a frequency set higher than that of a main signal and subjecting the main carrier to frequency modulation by the resulting baseband signal. This method is, however, accompanied by a problem of the occurrence of crosstalk from the main signal to the sub signal. This is attributable to the limited band width of the main carrier on the transmission line, allowing a correction signal equal in magnitude but negative in phase to the crosstalk to be easily prepared on the basis of the transmission line amplitude and group-delay frequency responses and the main signal. The crosstalk may be improved if this correction signal is prepared from the main signal on the transmitting side and added to the sub signal to be transmitted or if the correction signal is prepared from the demodulated main signal on the receiving side and added to the demodulated sub signal.
-
-
-
-
-
-
-
-
-
搜索结果
30 条记录 (耗时 0.018 秒)
