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31. 发明授权

US5418656A Drop-out detecting circuit 失效
标题翻译：掉电检测电路
公开(公告)号：US5418656A
公开(公告)日：1995-05-23
申请号：US972174
申请日：1992-11-04
申请人： Hiromi Fukazawa , Masahiro Ikeda
发明人： Hiromi Fukazawa , Masahiro Ikeda
IPC分类号： G11B20/18 , H04N5/94
CPC分类号： H04N5/94 , G11B20/18
摘要： To set the drop-out detection level constant in the drop-out detecting circuit used for a magnetic recording apparatus, without regulating the output level of a magnetic recording head and the gain of a preamplifier, the detecting circuit comprises an envelope detection section for detecting the envelope of a reproduced signal; a voltage division section for dividing the output signal voltage of the envelope detection section; and a comparator for comparing the output signal of the voltage division section with the reproduced signal to detect a drop-out of the reproduced signal. Therefore, it is possible to reduce the number of parts and the number of adjustment process to reduce the manufacturing cost thereof. Further, to detect the drop-out portion throughout as defective tape locations, irrespective of the length of the drop-out portion, the detecting circuit further comprises a drop-out start detection section, a drop-out end detection section, and an OR gate.
摘要翻译：为了在用于磁记录装置的脱出检测电路中设定脱出检测电平的常数，而不调节磁记录头的输出电平和前置放大器的增益，检测电路包括用于检测再生信号的包络; 分压部，其对所述包络检测部的输出信号电压进行分压; 以及比较器，用于将分压部分的输出信号与再现信号进行比较，以检测再现信号的退出。因此，可以减少部件的数量和调整过程的数量，以降低其制造成本。此外，为了检测作为有缺陷的磁带位置的丢失部分，与检出电路的长度无关，检测电路还包括一个出口开始检测部分，一个退出结束检测部分和一个OR 门。

32. 发明授权

US5416600A Concealing method of video signal 失效
标题翻译：视频信号隐藏方法
公开(公告)号：US5416600A
公开(公告)日：1995-05-16
申请号：US291460
申请日：1994-08-17
申请人： Chiyoko Matsumi , Tatsuro Juri
发明人： Chiyoko Matsumi , Tatsuro Juri
IPC分类号： H04N19/60 , H03M13/00 , H04N1/411 , H04N5/926 , H04N5/945 , H04N11/04 , H04N19/423 , H04N19/44 , H04N19/65 , H04N19/85 , H04N19/89 , H04N19/895 , H04N5/94
CPC分类号： H04N5/945 , H04N19/895 , H04N5/9261
摘要： A coded digital video signal is obtained by dividing a digital video signal into plural pages each composed of K fields of pixel data, decomposing pixel data in each two pages into plural blocks each composed of a predetermined number of pixel data, and encoding the pixel data in each block by bit rate reduction encoding and error correction encoding. The thus obtained coded digital video signal is reproduced or transmitted and then subjected to a concealment process. The concealment process includes decoding the coded digital video signal to obtain reproduced blocks of pixel data and to detect an error block containing an error among the reproduced blocks, composing the reproduced blocks to obtain plural reproduced pages of pixel data, and concealing error pixel data contained in the error block in each two reproduced pages. Error pixel data in a first page is concealed using pixel data in a previous page, and error pixel data in a second page is concealed using pixel data in a succeeding page.
摘要翻译：通过将数字视频信号分割成由K个像素数据构成的多个页面来获得编码数字视频信号，将每两页中的像素数据分解为由预定数量的像素数据组成的多个块，并且对像素数据进行编码在每个块中通过比特率降低编码和纠错编码。如此获得的编码数字视频信号被再现或发送，然后进行隐蔽处理。隐藏处理包括对编码的数字视频信号进行解码以获得再现的像素数据块，并且检测包含再现块中的错误的错误块，构成再现块以获得多个再现页面的像素数据，以及隐藏包含的错误像素数据在每两个重现页面的错误块中。使用前一页中的像素数据隐藏第一页中的错误像素数据，并且使用后续页面中的像素数据隐藏第二页中的误差像素数据。

33. 发明授权

US5392129A Digital VCR signal processing apparatus for concealing uncorrectable errors 失效
标题翻译：用于隐藏不可校正错误的数字VCR信号处理装置
公开(公告)号：US5392129A
公开(公告)日：1995-02-21
申请号：US83052
申请日：1993-06-25
申请人： Hideki Ohtaka , Tatsuro Juri
发明人： Hideki Ohtaka , Tatsuro Juri
IPC分类号： G11B20/18 , G06T9/00 , H03M7/40 , H03M13/00 , H04N1/41 , H04N1/415 , H04N5/92 , H04N5/926 , H04N5/945 , H04N19/102 , H04N19/132 , H04N19/166 , H04N19/174 , H04N19/186 , H04N19/189 , H04N19/423 , H04N19/46 , H04N19/59 , H04N19/60 , H04N19/625 , H04N19/65 , H04N19/67 , H04N19/70 , H04N19/85 , H04N19/89 , H04N19/895 , H04N19/91 , H04N5/94
CPC分类号： H04N5/945 , H04N19/895 , H04N5/9264
摘要： A signal processing apparatus for use in a digital video signal reproducing apparatus for reproducing digital signal presented in sync blocks is disclosed. Each sync block has a fixed area for low frequency data and five subsequent sync blocks define a sharing group for sharing high frequency data. The signal processing apparatus includes an inner and outer correction circuit for correcting errors in the sync blocks. An error flag is provided to a sync block which still has an error remaining after the processing in the correction circuit. A memory is provided for storing errorless sync blocks of one frame. A substitution switch is provided for passing the errorless sync blocks, but substituting a sync block stored in the memory for a sync block still having some errors. Five sync blocks produced from the substitution switch are held in a delay. When no substitute sync block is detected in the five sync blocks in the delay, the data in the five sync blocks are decoded by a bit rate reduction decoder. But, when one to four substitute sync block is detected in the five sync blocks in the delay, only the low frequency data of the five sync blocks in the fixed area are decoded by the bit rate reduction decoder.
摘要翻译：公开了一种用于再现同步块中呈现的数字信号的数字视频信号再现装置中的信号处理装置。每个同步块具有用于低频数据的固定区域，并且五个后续同步块定义用于共享高频数据的共享组。信号处理装置包括用于校正同步块中的错误的内部和外部校正电路。错误标志被提供给在校正电路中的处理之后仍然具有错误的同步块。提供存储器用于存储一帧的无错同步块。提供了用于传递无错同步块的替代开关，但是将存储在存储器中的同步块替换为仍然具有一些错误的同步块。由替代开关产生的五个同步块被延迟。当延迟中的五个同步块中没有检测到替代同步块时，五个同步块中的数据被比特率降低解码器解码。但是，当延迟中的五个同步块中检测到一到四个替代同步块时，只有固定区域中的5个同步块的低频数据被比特率降低解码器解码。

34. 发明授权

US5287197A Signal demodulation device 失效
标题翻译：信号解调装置
公开(公告)号：US5287197A
公开(公告)日：1994-02-15
申请号：US685673
申请日：1991-04-16
申请人： Koichi Sato
发明人： Koichi Sato
IPC分类号： H04L27/233 , H04N9/88 , H04N5/94
CPC分类号： H04L27/2334
摘要： A signal demodulation device includes a change point sensing circuit which senses a change point of an envelope of a DPSK signal, and a range setting circuit which generates a gate pulse corresponding to a period in which the DPSK signal cannot be changed. An output signal of the change point sensing circuit and the gate pulse are inputted to an AND gate so that a trigger prohibition signal is obtained. The trigger prohibition signal and the output signal of the change point sensing circuit are inputted to a NOR gate so that a trigger pulse corresponding only to a normal change point of the DPSK signal is generated, so that DPSK modulation data is obtained.
摘要翻译：信号解调装置包括感测DPSK信号的包络的变化点的变化点感测电路以及与DPSK信号不能改变的周期相对应地生成门脉冲的量程设定电路。改变点检测电路和门脉冲的输出信号被输入到与门，从而获得触发禁止信号。触发禁止信号和变化点感测电路的输出信号被输入到或非门，使得仅产生与DPSK信号的正常变化点对应的触发脉冲，从而获得DPSK调制数据。

35. 发明授权

US5280396A Video signal processing apparatus for correcting time base of video signal 失效
标题翻译：视频信号处理装置，用于校正视频信号的时基
公开(公告)号：US5280396A
公开(公告)日：1994-01-18
申请号：US770450
申请日：1991-10-03
申请人： Masakazu Hamaguchi , Takashi Furuhata , Hiroaki Takahashi
发明人： Masakazu Hamaguchi , Takashi Furuhata , Hiroaki Takahashi
IPC分类号： H04N5/94 , H04N5/945 , H04N5/956 , H04N5/78
CPC分类号： H04N5/956 , H04N5/945
摘要： An apparatus for correcting a time base of a video signal includes a first memory having a capacity of one line of a video signal and a second memory having a capacity of N lines of the video signal connected to the first memory. A video signal is written in the first memory according to a first control signal generated based on synchronizing information in the video signal and first clock pulses synchronized with the synchronizing information, the video signal written in the first memory is read from the first memory and written in the second memory according to a second control signal generated based on second clock pulses, and the video signal written in the second memory is read from the second memory based on a reference signal generated based on the second clock pulses.
摘要翻译：用于校正视频信号的时基的装置包括具有视频信号的一行的容量的第一存储器和连接到第一存储器的视频信号的N行的容量的第二存储器。根据基于视频信号中的同步信息和与同步信息同步的第一时钟脉冲产生的第一控制信号将视频信号写入第一存储器，从第一存储器读取写入第一存储器的视频信号并写入根据基于第二时钟脉冲产生的第二控制信号在第二存储器中，并且基于基于第二时钟脉冲产生的参考信号，从第二存储器读取写入第二存储器的视频信号。

36. 发明授权

US5194963A Dual deck videocassette recorder system 失效
标题翻译：双卡录像机系统
公开(公告)号：US5194963A
公开(公告)日：1993-03-16
申请号：US230181
申请日：1988-08-09
申请人： R. Terren Dunlap , John B. Berkheimer , C. Duane Woodmas
发明人： R. Terren Dunlap , John B. Berkheimer , C. Duane Woodmas
IPC分类号： G11B5/86 , G11B15/00 , G11B20/00 , G11B27/024 , G11B27/028 , G11B31/00 , H04N5/765 , H04N5/7826 , H04N5/91 , H04N5/94 , H04N9/793 , H04N9/83
CPC分类号： G11B20/0021 , G11B15/00 , G11B20/00086 , G11B27/028 , G11B31/006 , G11B5/86 , H04N5/765 , H04N5/78263 , H04N5/94 , H04N9/7933 , G11B2220/455 , G11B2220/90 , G11B2220/91 , G11B27/024
摘要： A videocassette deck and taping system includes two videocassette decks therefor (A and B) included within a single housing utilizing a common power supply, tuner, controls, and switching and control circuitry to enable simultaneous multiple functions using both decks and to also enable tape to tape duplication (dubbing) in a manner avoiding degradation of video information content, as well as additional function selection.
摘要翻译：录像带甲板和录音系统包括两个盒式录像带（A和B），其包含在单个外壳内，利用公共电源，调谐器，控制以及切换和控制电路，以使得能够同时使用两个卡座的多个功能，并且还能够使磁带磁带复制（配音），以避免视频信息内容的劣化，以及附加的功能选择。

37. 发明授权

US5179453A Recording medium playback apparatus including a variable compensation circuit 失效
标题翻译：记录介质回放装置，包括可变补偿电路
公开(公告)号：US5179453A
公开(公告)日：1993-01-12
申请号：US679986
申请日：1991-04-03
申请人： Akihiro Tozaki
发明人： Akihiro Tozaki
IPC分类号： H04N5/94 , G11B20/02 , H04N5/932 , H04N9/797 , H04N9/87 , H04N9/88
CPC分类号： H04N5/932 , H04N9/7973 , H04N9/87 , H04N9/88
摘要： A recording medium playback apparatus for production of a composite video signal by combining a multiplicity of H-line video signals reproduced from playback of a plurality of recording media which carry different video signals respectively is provided in which when some H-line video signals are absent in the composite video signal, the number of the absent H-line video signals are examined and then, compensation for the absent H-line video signals is executed by interpolation between two, preceding and succeeding, H-line video signals if the number is not more than a given value or by holding a row of the preceding H-line video signals if the number exceeds the given value.

38. 发明授权

US5153742A Drop-out correction inhibitor for preventing corruption of spatially non-correlated data 失效
标题翻译：用于防止空间不相关数据损坏的丢弃修正抑制剂
公开(公告)号：US5153742A
公开(公告)日：1992-10-06
申请号：US738022
申请日：1991-07-30
申请人： Khosro M. Rabii
发明人： Khosro M. Rabii
IPC分类号： H04N5/93 , H04N5/94
CPC分类号： H04N5/94 , H04N5/93
摘要： A drop-out correction circuit for use in a VCR includes a generator for developing a gating signal identifying selected horizontal lines of a video signal containing spatially non-correlated encoded data. A control signal developed in response to a drop-out detection signal and the gating signal is applied to a drop-out corrector for providing a drop-out corrected signal at an output terminal except during the occurrence of said selected lines. A noise cancellation circuit operative except during the selected horizontal lines may be coupled to the output of the drop-out corrector.
摘要翻译：用于VCR的出错校正电路包括用于开发识别包含空间不相关的编码数据的视频信号的所选水平行的选通信号的发生器。响应于脱出检测信号和门控信号而产生的控制信号被施加到出口校正器，用于在出现所选择的线路的过程中，在输出端子处提供丢失校正信号。除了在所选择的水平线之内操作的噪声消除电路可以耦合到辍学校正器的输出。

39. 发明授权

US4979037A Apparatus for demodulating sub-nyquist sampled video signal and demodulating method therefor 失效
标题翻译：用于解调亚奎斯特采样视频信号的装置及其解调方法
公开(公告)号：US4979037A
公开(公告)日：1990-12-18
申请号：US338088
申请日：1989-04-14
申请人： Yosuke Mizutani , Takehiko Asano , Syuji Yanase , Shinichiro Kitagawa , Akihiko Yamashita
发明人： Yosuke Mizutani , Takehiko Asano , Syuji Yanase , Shinichiro Kitagawa , Akihiko Yamashita
IPC分类号： H04N5/94 , H04N7/015 , H04N9/79 , H04N9/797 , H04N9/87 , H04N9/88
CPC分类号： H04N9/7904 , H04N9/797 , H04N9/87 , H04N9/88
摘要： An apparatus (MD) for reproducing, by a low-frequency replacement method, a noise-free high definition video (MUSE) signal obtained by band-compressing the high definition video signal in a time-compressed integration Sub-Nyquist encoding system so as to include no aliasing noise in a low-frequency component below 4 MHz. This reproducing apparatus includes a converter (3) for converting a reproduced or received MUSE signal into digital data and a memory (7) for outputting feedback data in which preceding by two fields and data preceding by four fields with respect to the current field are alternately arranged, a circuit (6; 33) for replacing/non-replacing the data preceding by four fields by first data corresponding to the current field data from the current field data and the feedback data and deriving a data train in which the first data and the data preceding by two fields are alternately arranged. Output from the data train deriving circuit is employed to be converted to composite data by a mixture 11, and a circuit (LC) for replacing the low-frequency component of the current field data or the first data with the low-frequency component of the composite data. The reproducing apparatus further includes a circuit (15, 18, 19, 19, 54; 15, 35; 34, 15', 54') for inhibiting this low-frequency replacement as well as replacement of the data preceding by four fields and the first data upon generation of noise such as dropout in the reproduced MUSE signal.

40. 发明授权

US4977461A Dropout detecting circuit with one-half wavelength delay 失效
标题翻译：具有半波长延迟的压差检测电路
公开(公告)号：US4977461A
公开(公告)日：1990-12-11
申请号：US323894
申请日：1989-03-15
申请人： Isao Ichimura
发明人： Isao Ichimura
IPC分类号： G11B7/00 , G11B7/004 , G11B20/02 , G11B20/06 , H04N5/94
CPC分类号： G11B20/025 , H04N5/94
摘要： A dropout detection circuit includes a delay circuit for causing a delay in playback signals reproduced from an optical recording medium. The delay corresponds to one half of the wavelength of the central frequency of the carrier wave for the playback signals. A summation circuit sums the playback signals with the delayed output signals of the delay circuit, and a level detection circuit detects when the output signal level of the summation circuit exceeds a predetermined level. The output signal of the level detection circuit serves as a signal for detecting dropouts in the reproduced signals and is used as a control signal to control the operation of a switch. The switch normally passes demodulated playback signals to an output terminal. However, in case a dropout is detected in a given horizontal line, the control signal operates the switch so that it passes to the output terminal demodulated playback signals that have been delayed by one horizontal line period.
摘要翻译：一个压差检测电路包括延迟电路，用于引起从光学记录介质再现的重放信号的延迟。延迟对应于重放信号的载波的中心频率的波长的一半。求和电路将回放信号与延迟电路的延迟输出信号相加，电平检测电路检测何时加法电路的输出信号电平超过预定电平。电平检测电路的输出信号用作检测再现信号中的丢失的信号，并用作控制信号以控制开关的操作。开关通常将解调的重放信号传送到输出端子。然而，在给定水平线中检测到压差的情况下，控制信号操作开关，使得其转到延迟了一个水平行周期的输出端解调的重放信号。

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