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91. 发明授权

US5805240A Radio frequency transmitter having circuitry for regulating a mixing frequency adjusting output power, eliminating high frequency abnormalities, preventing audio/visual interference, and controlling output intensity 失效
标题翻译：射频发射机具有用于调节混频调整输出功率，消除高频异常，防止音/视干扰和控制输出强度的电路
公开(公告)号：US5805240A
公开(公告)日：1998-09-08
申请号：US579161
申请日：1995-12-27
申请人： Yee-Cheng Lo , Venson Liaw
发明人： Yee-Cheng Lo , Venson Liaw
IPC分类号： H03D7/12 , H04N5/38 , H04N7/045 , H04N5/40 , H04N5/60
CPC分类号： H04N7/045 , H03D7/12 , H04N5/38
摘要： A radio frequency transmitter includes a video signal input terminal, an audio signal input terminal, a variable frequency modulation degree circuit, a band pass filter, a sound intensity regulation circuit, a voltage controlled oscillator, a modulation mixer, and an amplifying circuit. The transmitter is arranged to eliminate high frequency abnormalities, prevent interference of audio signals with video signals, stabilize the audio frequency response of the transmitter, and improve circuit stability.
摘要翻译：射频发送器包括视频信号输入端子，音频信号输入端子，可变频率调制度电路，带通滤波器，声强调节电路，压控振荡器，调制混频器和放大电路。发射器被设置为消除高频异常，防止音频信号与视频信号的干扰，稳定发射机的音频响应，并提高电路稳定性。

92. 发明授权

US5751366A Inclusion of audio signal within video signal 失效
标题翻译：视频信号中包含音频信号
公开(公告)号：US5751366A
公开(公告)日：1998-05-12
申请号：US522625
申请日：1995-08-31
申请人： Gary Lamont Hobbs
发明人： Gary Lamont Hobbs
IPC分类号： H04N7/04 , H04N7/045 , H04N7/085 , H04N7/12 , H04N7/084
CPC分类号： H04N7/122 , H04N7/04 , H04N7/0855
摘要： A system for including audio data within a video signal. The number of frames of video data transmitted is reduced, thereby allowing greater time for each individual frame, thereby allowing the breezeway of each line of each frame to be lengthened. The breezeway resides between the horizontal synch pulse for the line, and the color burst signal. Samples of digitized audio are placed into the breezeways.
摘要翻译：一种用于在视频信号中包括音频数据的系统。传输的视频数据的帧数减少，从而允许每个单独帧的更大的时间，从而允许每帧的每一行的竖排被延长。清除线位于线路的水平同步脉冲和色同步信号之间。将数字化音频的样品放入breezeways。

93. 发明授权

US5067018A Frequency-division multiplexing arrangement for preventing interference between a main television signal and a helper signal thereof 失效
标题翻译：频分复用装置，用于防止主电视信号与其辅助信号之间的干扰
公开(公告)号：US5067018A
公开(公告)日：1991-11-19
申请号：US531745
申请日：1990-06-01
申请人： Noriya Sakamoto , Seijiro Yasuki , Kiyoyuki Kawai
发明人： Noriya Sakamoto , Seijiro Yasuki , Kiyoyuki Kawai
IPC分类号： H04N7/00 , H04N7/015 , H04N7/045 , H04N7/08 , H04N7/081 , H04N11/24
CPC分类号： H04N7/007 , H04N11/006 , H04N7/015 , H04N7/045
摘要： A main signal as the existing television signal and a helper signal for high definition are prepared in a transmitter. The energy of the main signal for a plurality of pixels is sequentially detected by an energy detector constituted by an absolute value circuit and an accumulator. The helper signal is controlled by a level controller, constituted by an adder and a divider, in such a way that its level follows according to the level of the detected energy. The level-controlled helper signal is frequency-multiplexed with the main signal having a frequency band of a removed region by a frequency multiplexer. A frequency-multiplexed signal separator of a receiver separates the mutiplexed signal into the main signal and the helper signal. The energy of the separated main signal for a plurality of pixels is sequentially detected by an energy detector constituted by an absolute value circuit and an accumulator. The separated helper signal has its frequency band restored to the original band from the removed region by a frequency domain restoring circuit. The restored helper signal is subjected to level control by a level controller, constituted by an adder and a multiplier, in the opposite characteristic to that of the sender side in accordance with the level of the detected energy.
摘要翻译：作为现有电视信号的主信号和用于高清晰度的辅助信号在发射机中准备。由绝对值电路和累加器构成的能量检测器依次检测多个像素的主信号的能量。辅助信号由电平控制器控制，电平控制器由加法器和分频器构成，其电平按照检测到的能量的电平进行跟踪。电平控制的辅助信号通过频率复用器与具有去除区域的频带的主信号频率复用。接收机的频率复用信号分离器将多路复用信号分离成主信号和辅助信号。通过由绝对值电路和累加器构成的能量检测器依次检测多个像素分离的主信号的能量。分离的辅助信号的频带通过频域恢复电路从去除的区域恢复到原始频带。恢复的辅助信号由与加法器和乘法器构成的电平控制器根据检测能量的电平进行与发送侧相反的特性的电平控制。

94. 发明授权

US5003395A Satellite receiver having an independent active energy dispersal signal generator 失效
标题翻译：卫星接收机具有独立的有源能量分散信号发生器
公开(公告)号：US5003395A
公开(公告)日：1991-03-26
申请号：US414038
申请日：1989-09-28
申请人： Louis P. M. Scheurs
发明人： Louis P. M. Scheurs
IPC分类号： H04N5/455 , H04N5/16 , H04N7/045 , H04N7/20
CPC分类号： H04N5/16 , H04N7/045
摘要： In a satellite receiver for a sum signal of a television signal and an energy dispersal signal, the sum signal being frequency-modulated on a carrier, the satellite receiver including a frequency demodulator (5) for obtaining a demodulated sum signal, a television signal processing circuit (8) including a decoding circuit (21) and a compensation circuit (17) which is synchronizable with the television signal to obtain the television signal from the sum signal, the compensation circuit (17) includes an active energy dispersal signal generator for obtaining the energy dispersal signal independently of the amplitude of the demodulated sum signal, the active energy dispersal signal generator having a synchronizing signal input (19) for applying a picture-frequency synchronizing signal thereto.

95. 发明授权

US4945404A Video communication system and phase or frequency modulator included therein 失效
标题翻译：视频通信系统及其中包括的相位或频率调制器
公开(公告)号：US4945404A
公开(公告)日：1990-07-31
申请号：US191103
申请日：1988-05-06
申请人： Gershon Miller
发明人： Gershon Miller
IPC分类号： H04N7/045 , H04N7/12 , H04N7/24
CPC分类号： H04N21/2383 , H04N21/4382 , H04N7/045 , H04N7/122
摘要： A video communication system for transmitting still pictures of a scene during periodic intervals comprises a T.V. camera producing video analog signals of the scene to be transmitted, an analog-to-digital converter converting the video analog signals to pixel digital signals representing the gray level of each pixel in the scene, a memory for storing the pixel gray levels, and a phase modulator for modulating a carrier wave by the pixel gray levels from the memory.

96. 发明授权

US4945403A Color television format using pulse frequency and pulse width modulation 失效
标题翻译：彩色电视格式采用脉冲频率和脉冲宽度调制
公开(公告)号：US4945403A
公开(公告)日：1990-07-31
申请号：US289825
申请日：1988-12-27
申请人： Kiyoshi Kubo , Noboru Okamura , Susumu Morikura
发明人： Kiyoshi Kubo , Noboru Okamura , Susumu Morikura
IPC分类号： F02B75/02 , H04N7/045 , H04N7/22 , H04N11/04
CPC分类号： H04N7/22 , H04N7/045 , F02B2075/025
摘要： A luminance signal in a component video signal is pulse frequency modulated, and the pulse frequency modulated signal is sequentially pulse width modulated by two color difference signals alternately. Thus, the component video signal is transmitted as one pulse train signal efficiently without extending the transmission band widely. A sound signal and a data signal can also be transmitted as digital signal in the one pulse train signal. The luminance signal and two color difference signals may also be inverted line-by-line prior to being modulated.
摘要翻译：分量视频信号中的亮度信号（Y）被脉冲频率调制，并且脉冲频率调制信号被两个色差信号（Pr，Pb）交替地顺序地进行脉宽调制。因此，分量视频信号作为一个脉冲串信号被有效传输，而不会广泛地扩展传输频带。

97. 发明授权

US4907087A Transmission of signals through analog channels using adaptive frequency modulation 失效
标题翻译：使用自适应频率调制通过模拟通道传输信号
公开(公告)号：US4907087A
公开(公告)日：1990-03-06
申请号：US61140
申请日：1987-06-10
申请人： William F. Schreiber
发明人： William F. Schreiber
IPC分类号： H04N5/38 , H04B1/66 , H04N7/045 , H04N7/083 , H04N7/12 , H04N7/26 , H04N11/04
CPC分类号： H04N7/083 , H04N11/048 , H04N7/045 , H04N19/30
摘要： Improved effifiency of frequency-modulated (FM) transmission of signals through analog channels, i.e., achievement of a higher bandwidth and/or signal-to-noise ratio (SNR) in the received signal for a given channel bandwidth and channel carrier-to-noise ratio (CNR), is accomplished by adaptive adjustment of the modulation index in such a manner that the spectrum of the channel signal more nearly occupies the entire channel more of the time than it would otherwise. Data is transmitted, along with the signal, to enable the receiver to calculate the modulation index at each instant so that the signal can be properly demodulated. The invention has application to FM transmission of signals representing visual image or other information, such as sound, for which human perception of noise is greatest in areas of low amplitude and/or frequency and reduced in and immediately adjacent to areas of high amplitude and/or frequency.
摘要翻译：通过模拟通道提高频率调制（FM）信号传输的效率，即为给定的信道带宽和信道载波到信道带宽和/或信噪比（SNR）达到更高的带宽和/或信噪比（SNR）噪声比（CNR））通过调制指数的自适应调整来实现，使得信道信号的频谱比其它情况更多地占据整个信道的时间。与信号一起发送数据，使得接收机能够在每个瞬间计算调制指数，使信号能够被适当地解调。本发明适用于表示视觉图像或其他信息（例如声音）的信号的FM传输，对于该信号，在低幅度和/或频率的区域中人类对噪声的感知最大，并且在高幅度区域和/ 或频率。

98. 发明授权

US4821120A Television sub-carrier transmission 失效
标题翻译：电视副载波传输
公开(公告)号：US4821120A
公开(公告)日：1989-04-11
申请号：US873430
申请日：1986-06-12
申请人： Martin Tomlinson
发明人： Martin Tomlinson
IPC分类号： H04N7/045 , H04N7/081 , H04N7/08
CPC分类号： H04N7/045 , H04N7/081
摘要： In a receiver for the reception of satellite television signals sub-carrier signals carrying, for example, data are recovered from the demodulated television signal and themselves demodulated to provide data outputs. Prior to the second demodulation, each sub-carrier signal is averaged to improve its signal-to-noise, ratio, thereby taking advantage of the relatively small basic bandwidth of the sub-carrier signal to enable satisfactory reception of the signal in poor reception conditions when the received signal is too weak to obtain an acceptable television picture signal. Impulse noise in the received signal is reduced prior to averaging. To avoid intermodulation products being generated by the transmission and reception of several sub-carriers together, direct sequence modulation of the transmitted sub-carriers can be used to spread their power over a wider frequency band. A code lock loop circuit is then used in the receiver to recover the original narrow band signals, which are subsequently averaged to obtain the advantage in signal-to-noise ratio.
摘要翻译：在用于接收卫星电视信号的接收机中，携带例如数据的子载波信号从解调的电视信号中恢复并且被解调以提供数据输出。在第二次解调之前，对每个副载波信号进行平均以提高其信噪比，从而利用副载波信号的较小的基本带宽，以使接收条件差的信号能够令人满意地接收当接收到的信号太弱而不能获得可接受的电视图像信号时。在平均之前，接收信号中的脉冲噪声减小。为了避免由几个子载波的发送和接收产生的互调产物，所发射的子载波的直接序列调制可用于在更宽的频带上扩展它们的功率。然后在接收机中使用码锁环电路来恢复原始窄带信号，随后将其平均以获得信噪比的优点。

99. 发明授权

US4754228A Method and apparatus for demodulating an angle modulated signal 失效
标题翻译：用于解调角度调制信号的方法和装置
公开(公告)号：US4754228A
公开(公告)日：1988-06-28
申请号：US933049
申请日：1986-11-20
申请人： Martin Tomlinson
发明人： Martin Tomlinson
IPC分类号： H04N7/045 , H04N7/081 , H03D3/00
CPC分类号： H04N7/045 , H04N7/081
摘要： In an improved demodulator, which is primarily applicable to the demodulation of angle modulated signals with a poor carrier-to-noise ratio (e.g. satellite TV signals received with a small aperture dish antenna), an intermediate frequency stage (20) is coupled to a differential phase circuit (48,50,52,54) in which delayed in-phase and quadrature components of the intermediate frequency signal are multiplied with the intermediate frequency signal itself to generate a pair of baseband differential phase quadrature signal components having a reduced noise content.These differential phase quadrature signal components are than averaged by filters (56,58) to further improve the signal to noise ratio, and then digitized and fed as digital samples to a PROM circuit (38) which performs an inverse tangent operation to derive a demodulated digital signal representative of the angle modulation .phi., where cos .phi. and sin .phi. are the differential phase components. Impulse noise is minimized by carrying out the differential phase and averaging operation prior to the nonlinear inverse tangent operation. The invention also includes the technique of mixing signal components which are delayed relative to each other by a time greater than or equal to 0.25/B, where B is the IF signal bandwidth, to achieve further impulse noise reduction.
摘要翻译：在改进的解调器中，其主要适用于具有差的载波噪声比的角度调制信号的解调（例如，用小孔径碟形天线接收的卫星电视信号），中频级（20）耦合到差分相位电路（48,50,52,54），其中中频信号的延迟的同相和正交分量与中频信号本身相乘以产生具有降低的噪声含量的一对基带差分相位正交信号分量这些差分相位正交信号分量不是通过滤波器（56,58）对滤波器（56,58）进行平均，以进一步提高信噪比，然后数字化并作为数字样本馈送到PROM电路（38），PROM电路执行反正切运算以导出解调的数字信号代表角度调制phi，其中cos phi和sin phi是微分相位分量。通过在非线性反正切运算之前执行差分相位和平均运算，使脉冲噪声最小化。本发明还包括混合相对于彼此延迟大于或等于0.25 / B的时间的信号分量的技术，其中B是IF信号带宽，以实现进一步的脉冲噪声降低。

100. 发明授权

US4318126A Multiplexed video transmission apparatus for satellite communications 失效
标题翻译：用于卫星通信的多路复用视频传输装置
公开(公告)号：US4318126A
公开(公告)日：1982-03-02
申请号：US136547
申请日：1980-04-02
申请人： Marvin L. Sassler
发明人： Marvin L. Sassler
IPC分类号： H04N7/045 , H04N7/08 , H04N7/085 , H04N7/16 , H04N7/04
CPC分类号： H04N7/16 , H04N7/045 , H04N7/08 , H04N7/085
摘要： Improved multiplexed communications apparatus distributes plural video signals via a single satellite transponder with enhanced reproduced quality, i.e., improved signal-to-noise ratio. The up-link transmitter delays each signal for one line period, and computes statistics characterizing the preceding subject line (e.g., minimum signal level and dynamic range) which are transmitted during the horizontal synchronizing pulse period. The transmitted video is then shifted in level and selectively amplified in accordance with the line statistics to more fully occupy the available transponder deviation allotted to the channel.Following satellite frequency shifting and transponder re-broadcasting, the received, modified video is restored utilizing the sync-period transmitted information (minimum level/offset; range/scale factor). Each multiplexed received video signal thus exhibits a substantially enhanced signal-to-noise ratio vis-a-vis video information transmitted in unmodified form.
摘要翻译：改进的多路复用通信装置经由具有增强的再现质量的单个卫星转发器分配多个视频信号，即提高的信噪比。上行发送器将每个信号延迟一行周期，并且计算表征在水平同步脉冲周期期间发送的前一主题行（例如，最小信号电平和动态范围）的统计。然后，所发送的视频被按照电平进行移位，并根据行统计量被有选择地放大，以更充分地占据分配给信道的可用转发器偏差。在卫星频移和应答器重播之后，利用同步周期发送的信息（最小电平/偏移;范围/比例因子）恢复接收到的修改视频。因此，每个复用的接收视频信号相对于以未修改的形式发送的视频信息显示出显着增强的信噪比。

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