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公开(公告)号：US5630214A
公开(公告)日：1997-05-13
申请号：US397735
申请日：1995-03-02
申请人： Akio Yamamoto , Masaki Noda , Toshio Nagashima , Masatoshi Oga
发明人： Akio Yamamoto , Masaki Noda , Toshio Nagashima , Masatoshi Oga
摘要： A wide-band receiving apparatus used in an FM-FDM type optical image distributing system for transmitting multi-wave and multiple TV signals comprises a circuit for receiving a wide-band input signal containing modified RF signals of two or more different frequency bands and separating the RF signals by the bands; respectively, a first circuit for selecting one of the separated RF signals; a local oscillating circuit for generating a first oscillating signal of a fundamental frequency which is determined based on the frequency range of the selected RF signal; a circuit for producing at least one oscillating signal of a frequency having a predetermined ratio to the fundamental frequency; a second selecting circuit for selecting one of the first oscillating signal and at least one second oscillating signal; a circuit for mixing the selected RF signal with the selected oscillating signal thereby producing an intermediate-frequency signal; and a circuit for demodulating the intermediate-frequency signal.
摘要翻译： 在用于发送多波和多个TV信号的FM-FDM型光学图像分配系统中使用的宽带接收装置包括用于接收包含两个或更多个不同频带的修改的RF信号的宽带输入信号的电路， RF信号由频带; 分别用于选择所述分离的RF信号之一的第一电路; 本地振荡电路，用于产生基于所选RF信号的频率范围确定的基频的第一振荡信号; 用于产生具有与所述基频具有预定比率的频率的至少一个振荡信号的电路; 第二选择电路，用于选择第一振荡信号和至少一个第二振荡信号之一; 用于将所选择的RF信号与所选择的振荡信号混合从而产生中频信号的电路; 以及用于解调中频信号的电路。
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2.发明授权Frequency converter used for a receiver which receives signals of a UHF band or a microwave band 失效用于接收UHF频带或微波频带信号的接收机的变频器
公开(公告)号：US4731875A
公开(公告)日：1988-03-15
申请号：US827626
申请日：1986-02-10
摘要： A frequency converter which is capable of rejecting unnecessary signals generated by image signals. The frequency converter has first and second local oscillation circuits which generate local oscillation signals whose frequencies are the same and whose phases are different by 90 degrees from each other. The converter further includes two mixer circuits, and a hybrid coupler. The mixer circuits generate two unnecessary signals whose phases are different by 90 degrees from each other. The hybrid coupler delays one unnecessary signal by a quarter of a wavelength to generate two unnecessary signals whose phases are different by 180 degrees from each other, so that they are cancelled by each other.
摘要翻译： 一种频率转换器，其能够抑制由图像信号产生的不必要的信号。 该变频器具有第一和第二本地振荡电路，其产生频率相同且相位彼此相差90度的本地振荡信号。 该转换器还包括两个混频器电路和一个混合耦合器。 混频器电路产生相位相差90度的两个不必要的信号。 混合耦合器将一个不必要的信号延迟四分之一波长以产生相位彼此相差180度的两个不必要的信号，使得它们被彼此抵消。
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公开(公告)号：US4912520A
公开(公告)日：1990-03-27
申请号：US203418
申请日：1988-06-07
申请人： Akio Yamamoto , Toshio Nagashima
发明人： Akio Yamamoto , Toshio Nagashima
CPC分类号： H03D7/1441 , H03D7/1433 , H03D7/145 , H03D7/1458 , H03D7/1491 , H03D2200/0047 , H03D7/125 , H03J5/244
摘要： Disclosed is a mixer circuit which employs four FET's in a manner so that a source electrode of a first FET and a source electrode of a second FET are connected to a first terminal, a source electrode of a third FET and a source electrode of a fourth FET are connected to a second terminal, a first impedance circuit is connected between the first terminal and the earth, a second impedance circuit is connected between the second terminal and the earth, a first high frequency input terminal is connected through a first switching circuit to a junction between the first impedance circuit and the first terminal, a second high frequency input terminal is connected through a second switching circuit to a junction between the second impedance circuit and the second terminal, a gate electrode of the first FET and a gate electrode of the fourth FET are connected to a third terminal, a gate electrode of the second FET and a gate electrode of the third FET are connected to a fourth terminal, a drain electrode of the first FET and a drain electrode of the third FET are connected to a fifth terminal, a drain electrode of the second FET and a drain electrode of the fourth FET are connected to a sixth terminal, and an electric source supply circuit is connected to the fifth and sixth terminals. Phase-reversed local oscillation signals are fed to the third and fourth terminals.
摘要翻译： 公开了一种混频器电路，其采用四个FET，使得第一FET的源电极和第二FET的源电极连接到第一端子，第三FET的源极电极和第四FET的源极电极 FET连接到第二端子，第一阻抗电路连接在第一端子和地之间，第二阻抗电路连接在第二端子与地之间，第一高频输入端子通过第一开关电路连接到 第一阻抗电路和第一端子之间的接合点，第二高频输入端子通过第二开关电路连接到第二阻抗电路和第二端子之间的接点，第一FET的栅电极和栅电极 第四FET连接到第三端子，第二FET的栅电极和第三FET的栅电极连接到第四端子， n电极和第三FET的漏电极连接到第五端子，第二FET的漏电极和第四FET的漏电极连接到第六端子，电源电路是 连接到第五和第六个端子。 相位反转的本地振荡信号被馈送到第三和第四端子。
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4.发明授权Digital signal transmission system with priority information forcing display of text on a receiver 失效具有优先信息的数字信号传输系统强制在接收机上显示文本
公开(公告)号：US5760820A
公开(公告)日：1998-06-02
申请号：US598006
申请日：1996-02-07
申请人： Takanori Eda , Isao Nakagawa , Keiro Shinkawa , Tsutomu Noda , Toshio Nagashima , Kenji Katsumata , Satoshi Iimuro
发明人： Takanori Eda , Isao Nakagawa , Keiro Shinkawa , Tsutomu Noda , Toshio Nagashima , Kenji Katsumata , Satoshi Iimuro
IPC分类号： H04N19/00 , H04N5/445 , H04N7/025 , H04N7/03 , H04N7/035 , H04N7/14 , H04N7/16 , H04N7/173 , H04N19/102 , H04N19/134 , H04N19/162 , H04N19/196 , H04N19/37 , H04N19/42 , H04N19/423 , H04N19/70 , H04N21/236 , H04N21/2365 , H04N7/10
CPC分类号： H04N7/147 , H04N21/23614 , H04N21/2365 , H04N21/4347 , H04N21/4348 , H04N21/4882 , H04N21/814
摘要： A digital signal transmission system including a transmitter and a receiver and capable of transmitting highly efficiently compressed/coded digital video signals and receiving the video signals so that the text of emergency information or the like can be displayed together with video images without once expanding/decoding the digital video signals on the transmitter side. In this system, the multiplexer of the transmitter multiplexes digital video signals and digital audio signals with a digital information signal of text which is produced and has N-level priority information added by the information stream generator, and transmits the multiplex signal to the receiver. The receiver determines whether the text of the digital information signal is to be displayed on the basis of the priority information added to the digital information signal, and when it is determined that the text are to be displayed, the receiver can display the text of the digital information signal together with the image of the digital video signal.
摘要翻译： 一种数字信号传输系统，包括发射机和接收机，并且能够传输高效率的压缩/编码数字视频信号并接收视频信号，使得紧急信息等的文本与视频图像一起显示，而无需一次扩展/解码 发射机侧的数字视频信号。 在该系统中，发射机的多路复用器利用产生的文本的数字信息信号多路复用数字视频信号和数字音频信号，并且由信息流发生器添加了N级优先级信息，并将多路复用信号发送到接收机。 接收机根据添加到数字信息信号的优先级信息确定是否显示数字信息信号的文本，并且当确定要显示文本时，接收器可以显示文本 数字信息信号与数字视频信号的图像一起。
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公开(公告)号：US4353132A
公开(公告)日：1982-10-05
申请号：US226826
申请日：1981-01-21
CPC分类号： H01P3/081
摘要： A double superheterodyne tuner including a first and a second frequency converter and a bandpass filter, constituted of microstrip lines, wherein the substrate in which the bandpass filter is built is disposed back to back with the substrates in which the first and second frequency converters are constructed, with the substrate for the bandpass filter extending over the first and second frequency converters, so that a sufficient high-frequency isolation of circuit elements can be effected by the use of smaller shielding plates, the overall size can be reduced and a uniform grounded condition can be obtained.
摘要翻译： 包括由微带线构成的第一和第二频率转换器和带通滤波器的双重超外差调谐器，其中构成带通滤波器的基板与其中构成第一和第二变频器的基板背对背地背对着 用于带通滤波器的衬底在第一和第二变频器上延伸，使得可以通过使用较小的屏蔽板来实现对电路元件的充分的高频隔离，可以减小总体尺寸并且具有均匀的接地条件 可以获得。
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6.发明授权Device for controlling electric potential applied to developing electrode in an electrophotographic duplicator 失效用于控制施加到电子照相复印机中的显影电极的电位的装置
公开(公告)号：US3981268A
公开(公告)日：1976-09-21
申请号：US585780
申请日：1975-06-11
申请人： Takuzo Tsukamoto , Mitsuharu Nakaguchi , Hidetoshi Kito , Toshio Nagashima , Akihiko Shirata , Shinichi Tsuda
发明人： Takuzo Tsukamoto , Mitsuharu Nakaguchi , Hidetoshi Kito , Toshio Nagashima , Akihiko Shirata , Shinichi Tsuda
CPC分类号： G03G15/065
摘要： A device for use in an electrophotographic duplicator employing a sensitive member comprising a temperature-dependent sensitive material whose static charge characteristic varies with the surface temperature thereof, the sensitive member bearing an electrostatic latent image having an image region and a background region, the device comprising a developing electrode disposed at the periphery of the sensitive member for effecting uniform development of the image region; temperature sensitive means disposed in the vicinity of the sensitive member responsive to the surface temperature of the sensitive member for generating a bias potential for the developing electrode, the developing electrode being so controlled by the bias potential that the bias potential is always maintained at a value greater than the value of the potential of the background region even when the temperature at the surface of the sensitive material decreases substantially thereby necessitating a substantial increase in the bias potential whereby little, or any, toner is deposited on the background region to thereby lessen fogging thereof.
摘要翻译： 一种使用敏感元件的电子照相复印机的装置，其包括静电荷特性随其表面温度而变化的温度敏感材料，所述敏感部件承载具有图像区域和背景区域的静电潜像，所述装置包括 显影电极，设置在敏感部件的周围，用于均匀显影图像区域; 响应敏感部件的表面温度而产生用于显影电极的偏置电位的敏感元件附近的温度感应装置，显影电极被偏置电位控制，使得偏置电位始终保持在一个值 即使当敏感材料表面的温度大幅降低时，背景区域的电位值也大大降低，因此必须大幅增加偏置电位，从而在背景区域上沉积很少或任何调色剂，从而减少起雾 其中。
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公开(公告)号：US06909470B2
公开(公告)日：2005-06-21
申请号：US10338684
申请日：2003-01-09
CPC分类号： H04N5/4446 , H04N5/4401 , H04N5/52 , H04N11/002
摘要： A digital broadcast recorder capable of recording digital television (TV) signals includes a first frequency converter which converts a received digitally modulated TV signal into a first intermediate frequency signal having a frequency lower than that of the digitally modulated TV signal, the first intermediate frequency signal having a frequency in a standard TV band and useable in demodulating standard TV signals, a band-pass filter coupled to the first frequency converter, which selectively passes-through the first intermediate frequency signal, a phase-lock loop (PLL) circuit coupled to the first frequency converter, which controls an oscillation frequency of a local oscillator in the first frequency converter, a second frequency converter coupled to the band-pass filter, which converts the first intermediate frequency signal passed through the band-pass filter into a second intermediate frequency signal lower in frequency than said first intermediate frequency signal a digital demodulator coupled to the second frequency converter, which demodulates the second intermediate frequency signal as converted by the second frequency converter and a writer coupled to the digital demodulator, which records demodulated signal as demodulated by said digital demodulator in a recording medium.
摘要翻译： 能够记录数字电视（TV）信号的数字广播记录器包括：第一频率转换器，其将接收到的数字调制的TV信号转换成具有低于数字调制的TV信号的频率的第一中频信号;第一中频信号 具有在标准TV频带中的频率并且可用于解调标准TV信号的频带滤波器，耦合到第一频率转换器的带通滤波器，其选择性地穿过第一中频信号;锁相环（PLL）电路耦合到 控制第一变频器中的本地振荡器的振荡频率的第一变频器，耦合到带通滤波器的第二频率转换器，其将通过带通滤波器的第一中频信号转换成第二中间信号 频率信号的频率低于所述第一中频信号a digital de 耦合到第二频率转换器的调制器，其解调由第二频率转换器转换的第二中频信号，以及耦合到数字解调器的写入器，其将由所述数字解调器解调的解调信号记录在记录介质中。
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公开(公告)号：US06657678B1
公开(公告)日：2003-12-02
申请号：US09320712
申请日：1999-05-27
IPC分类号： H04N546
CPC分类号： H04N5/4446 , H04N5/4401 , H04N5/52 , H04N11/002
摘要： A digital broadcast recorder capable of recording a digital television (TV) signals, includes a first frequency converter which converts a received digitally modulated TV signal into a first intermediate frequency signal having a frequency lower than that of the digitally modulated TV signal, the first intermediate frequency signal having a frequency in a standard TV band and useable in demodulating standard TV signals, a band-pass filter coupled to the first frequency converter, which selectively passes-through the first intermediate frequency signal, a phase-lock loop (PLL) circuit coupled to the first frequency converter, which controls an oscillation frequency of a local oscillator in the first frequency converter, a second frequency converter coupled to the band-pass filter, which converts the first intermediate frequency signal passed through the band-pass filter into a second intermediate frequency signal lower in frequency than said first intermediate frequency signal a digital demodulator coupled to the second frequency converter, which demodulates the second intermediate frequency signal as converted by the second frequency converter and a writer coupled to the digital demodulator, which records demodulated signal as demodulated by said digital demodulator in a recording medium.
摘要翻译： 能够记录数字电视（TV）信号的数字广播记录器包括第一频率转换器，其将所接收的数字调制的TV信号转换成具有低于数字调制的TV信号的频率的第一中频信号，第一中间 频率信号具有在标准TV频带中的频率并且可用于解调标准TV信号;耦合到第一频率转换器的带通滤波器，其选择性地穿过第一中频信号;锁相环（PLL）电路 耦合到第一变频器，其控制第一变频器中的本地振荡器的振荡频率;耦合到带通滤波器的第二频率转换器，其将通过带通滤波器的第一中频信号转换成 第二中频信号的频率低于所述第一中频信号a数字 解调器，其耦合到第二频率转换器，其解调由第二频率转换器转换的第二中频信号，以及耦合到数字解调器的写入器，其将由所述数字解调器解调的解调信号记录在记录介质中。
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公开(公告)号：US5572264A
公开(公告)日：1996-11-05
申请号：US386038
申请日：1995-02-09
CPC分类号： H04N5/4446 , H04N5/4401 , H04N11/002 , H04N5/52
摘要： To make it possible to receive a modulated signal which is obtained by suppressing a carrier signal such as a high definition TV signal which is digitally demodulated such as QAM (quadrature amplitude modulation), a receiver of the double super-heterodyne system having the first and second mixers 9 and 13 is a basic constitution. A band pass filter having a flatness in pass band and a small deviation of group delay which will prevent the demodulation of a high definition TV signal from degradation is used a first intermediate frequency filter 11. An SAW filter is used as a second intermediate frequency filter 16. The third mixer 28 for converting a second intermediate frequency signal to a third intermediate frequency signal in frequency is installed and the frequency of the third intermediate frequency signal to be converted is set to a value lower than the frequency of the second intermediate frequency signal. The demodulator 33 for a high definition TV signal is installed so as to demodulate a high definition TV signal included in the third intermediate frequency signal.
摘要翻译： 为了可以接收通过抑制诸如QAM（正交幅度调制）等数字解调的高清晰度电视信号的载波信号获得的调制信号，具有第一和第二超外差系统的接收机 第二混合器9和13是基本构成。 使用具有通带平坦度的带通滤波器和防止高分辨率TV信号的解调降低的群延迟的小偏差，第一中频滤波器11.使用SAW滤波器作为第二中频滤波器 安装用于将第二中频信号转换为频率的第三中频信号的第三混频器28，将要转换的第三中频信号的频率设置为低于第二中频信号的频率 。 用于高清晰度电视信号的解调器33被安装成解调包括在第三中频信号中的高分辨率TV信号。
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公开(公告)号：US4160953A
公开(公告)日：1979-07-10
申请号：US885978
申请日：1978-03-13
CPC分类号： H03D11/04 , H03B5/1203 , H03B5/1231 , H03B5/124 , H03B5/1256 , H03D7/12
摘要： A self-oscillation mixer circuit includes a cascade amplifier circuitry which is composed of a first transistor of a common emitter connection having a collector connected to an emitter of a second transistor of a common base connection, a filter circuitry for deriving an intermediate frequency signal and a resonance circuit adapted to resonate at a local oscillation frequency being connected to the collector of the second transistor and a feedback circuitry connected between the resonance circuitry and the emitter of the first transistor.
摘要翻译： 自振荡混频器电路包括级联放大器电路，其由具有连接到公共基极连接的第二晶体管的发射极的集电极的公共发射极连接的第一晶体管，用于导出中频信号的滤波器电路和 谐振电路，其适于以连接到第二晶体管的集电极的本地振荡频率谐振，以及连接在谐振电路和第一晶体管的发射极之间的反馈电路。
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