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1. 发明授权

US09444554B2 Digital coherent receiving apparatus 有权
标题翻译：数字相干接收装置
公开(公告)号：US09444554B2
公开(公告)日：2016-09-13
申请号：US14040299
申请日：2013-09-27
申请人： FUJITSU LIMITED
发明人： Nobukazu Koizumi , Takeshi Hoshida , Takahito Tanimura , Hisao Nakashima , Koji Nakamuta , Noriyasu Nakayama
IPC分类号： H04B10/00 , H04B10/61 , H03J7/26 , H04B10/60 , H04L27/00 , H04L27/22 , H04L27/227 , H04L7/033
CPC分类号： H04B10/616 , H03J7/26 , H04B10/60 , H04B10/611 , H04B10/614 , H04B10/6165 , H04L7/0335 , H04L27/0014 , H04L27/223 , H04L27/2276 , H04L2027/0016 , H04L2027/0067
摘要： A digital coherent receiving apparatus includes a first oscillator for outputting a local light signal of a fixed frequency, a hybrid unit mixing the local light signal with a light signal received by a receiver, a second oscillator for outputting a sampling signal of a sampling frequency, a converter for converting the mixed light signal into digital signal synchronizing with the sampling signal, a waveform adjuster for adjusting a waveform distortion of the converted digital signal, a phase adjustor for adjusting a phase of the digital signal adjusted by the waveform adjustor, a demodulator for demodulating the digital signal adjusted by the phase adjuster, and a phase detector for detecting a phase of the digital signal adjusted by the phase adjuster, and a control signal output unit for outputting a frequency control signal on the basis of the detected phase signal to the second oscillator.
摘要翻译：数字相干接收装置包括用于输出固定频率的本地光信号的第一振荡器，将本地光信号与由接收机接收的光信号混合的混合单元，用于输出采样频率的采样信号的第二振荡器，用于将混合光信号转换为与采样信号同步的数字信号的转换器，用于调整转换的数字信号的波形失真的波形调节器，用于调整由波形调节器调节的数字信号的相位的相位调节器，解调器用于解调由相位调节器调节的数字信号，以及相位检测器，用于检测由相位调节器调节的数字信号的相位;以及控制信号输出单元，用于根据检测到的相位信号将频率控制信号输出到第二个振荡器。

2. 发明授权

US5335348A Radio receiver having frequency sweep control apparatus 失效
标题翻译：具有频率扫描控制装置的无线电接收机
公开(公告)号：US5335348A
公开(公告)日：1994-08-02
申请号：US998397
申请日：1992-12-29
申请人： Shinichi Kono
发明人： Shinichi Kono
IPC分类号： H03J1/00 , H03J7/26 , H04L7/04 , H04B1/16
CPC分类号： H03J1/0008 , H03J7/26 , H04L7/04
摘要： A frequency sweep control apparatus includes a variable frequency oscillator, a demodulator, a unique word signal detector, a sweep range controller, and a frequency controller. The variable frequency oscillator is capable of controlling an oscillation frequency. The demodulator demodulates a reception intermediate frequency signal by using an output from the variable frequency oscillator. The unique word signal detector detects a unique word signal in the reception signal from a demodulated output from the demodulator 102 and outputs a detection signal indicating a unique word signal detected state in which the unique word signal is detected or a unique word signal non-detected state in which the unique word signal is not detected. The sweep range controller controls a sweep range on the basis of an output from the unique word signal detector. The frequency controller controls the oscillation frequency of the variable frequency oscillator on the basis of an output from the sweep range controller.
摘要翻译：频率扫描控制装置包括可变频率振荡器，解调器，唯一字信号检测器，扫描范围控制器和频率控制器。变频振荡器能够控制振荡频率。解调器通过使用可变频率振荡器的输出来解调接收中频信号。唯一字信号检测器从解调器102的解调输出检测接收信号中的唯一字信号，并输出指示检测到唯一字信号的唯一字信号检测状态的检测信号或未检测到的唯一字信号未检测到唯一字信号的状态。扫描范围控制器基于来自唯一字信号检测器的输出来控制扫描范围。频率控制器基于来自扫描范围控制器的输出来控制可变频率振荡器的振荡频率。

3. 发明授权

US5280641A Signal-strength-peak detecting circuit for automatic tuning circuit 失效
标题翻译：用于自动调谐电路的信号强度峰值检测电路
公开(公告)号：US5280641A
公开(公告)日：1994-01-18
申请号：US723079
申请日：1991-06-28
申请人： Hisao Ishii , Shinichi Yamasaki
发明人： Hisao Ishii , Shinichi Yamasaki
IPC分类号： H03J3/10 , H03J7/18 , H03J7/26 , H04B17/00
CPC分类号： H03J7/18 , H03J7/26
摘要： In a signal-strength-peak detecting circuit, tuning frequencies by a tuning circuit are periodically varied. Wide band seek is performed according to a signal level of the varied frequencies. When the signal level is greater than a predetermined value, a fine tuning circuit varies tuning frequencies to perform narrow band seek. Further, change of signal levels is detected during narrow band seek to decide whether the peak of the signal level is trapezoidal or rounded. When the peak is decided to be rounded, the maximum value is used as the peak. On the other hand, when the peak is decided to be trapezoidal, the central point of an upper side of the trapezoid is selected as an optimum peak.
摘要翻译：在信号强度峰值检测电路中，调谐电路的调谐频率周期性地变化。根据变化频率的信号电平进行宽带寻道。当信号电平大于预定值时，微调电路改变调谐频率以执行窄频带寻道。此外，在窄带寻道期间检测信号电平的变化，以确定信号电平的峰值是梯形还是圆形。当峰值决定为四舍五入时，最大值用作峰值。另一方面，当峰被确定为梯形时，梯形上侧的中心点被选择为最佳峰。

4. 发明授权

US4004233A Search type tuning device 失效
标题翻译：搜索型调谐装置
公开(公告)号：US4004233A
公开(公告)日：1977-01-18
申请号：US558550
申请日：1975-03-14
申请人： Yoichi Sakamoto
发明人： Yoichi Sakamoto
IPC分类号： H03J5/02 , H03J7/26 , H04B1/32
CPC分类号： H03J5/0245 , H03J7/26
摘要： A search type tuning device wherein the output signal representing the difference frequency between the output frequency from a voltage-controlled frequency sweep oscillator and a reference frequency is filtered by a low-pass filter; the difference between the output voltage from the low-pass filter and a predetermined driving voltage for sweeping the oscillation frequency of the oscillator is derived from an adder; the output from the adder is integrated by an integrator; and the output voltage from the integrator is applied as a sweep voltage to the oscillator, thereby automatically maintaining the oscillation frequency thereof at a predetermined value. The analysis of the operation of the oscillator may be much facilitated, and when used as an automatic channel selector for a television receiver, a high speed automatic channel selection may be ensured.
摘要翻译：一种搜索型调谐装置，其中表示来自压控频率扫描振荡器的输出频率与参考频率之间的差频的输出信号被低通滤波器滤波; 从加法器导出来自低通滤波器的输出电压与用于扫描振荡器的振荡频率的预定驱动电压之间的差; 加法器的输出由积分器积分; 并且来自积分器的输出电压作为扫描电压施加到振荡器，从而将其振荡频率自动保持在预定值。振荡器的操作分析可以大大方便，并且当用作电视接收机的自动频道选择器时，可以确保高速自动频道选择。

5. 发明授权

US3968447A Method of amplitude-frequency conversion and a converter which operates in accordance with said method 失效
标题翻译：幅度频率转换方法和根据所述方法工作的转换器
公开(公告)号：US3968447A
公开(公告)日：1976-07-06
申请号：US424202
申请日：1973-12-13
申请人： Bernard Baylac , Robert Poujois , Jacques Ripert
发明人： Bernard Baylac , Robert Poujois , Jacques Ripert
IPC分类号： H04B1/26 , H03D3/04 , H03J3/18 , H03J7/08 , H03J7/26 , H03K7/06 , H04B1/16 , H03K1/16 , H03K3/72
CPC分类号： H03J7/08 , H03D3/04 , H03J3/185 , H03J7/26 , H03K7/06
摘要： The amplitude of an electrical signal is converted into a current of proportional intensity which is integrated and an integration voltage appears at the terminals of the integrating circuit. There is produced a signal which initiates stopping of the current integration and a signal which initiates the start of a following integration at the instant when the integration voltage attains a threshold value V.sub.O. Stopping of the integration occurs after a time-delay .theta., when the integration voltage has overstepped the threshold value V.sub.O and attained a maximum value V'.sub.O. The threshold value V.sub.O is adjusted so as to control the maximum value V'.sub.O in dependence on a reference voltage V".sub.O which is higher than V.sub.O. The frequency of integrations is measured, with the result that the conversion frequency is thus determined.
摘要翻译：电信号的振幅被转换成积分的比例强度的电流，并且积分电压出现在积分电路的端子处。在积分电压达到阈值VO的瞬间，产生开始停止电流积分的信号和启动后续积分开始的信号。当积分电压超过阈值VO并达到最大值V'O时，在时间延迟θ之后发生积分的停止。调整阈值VO，以便根据高于VO的参考电压V''O来控制最大值V'O。测量积分频率，从而确定转换频率。

6. 发明授权

US3757228A Circuit for automatic search tuning in radio receivers 失效
标题翻译：无线电接收机自动搜索调谐电路
公开(公告)号：US3757228A
公开(公告)日：1973-09-04
申请号：US3757228D
申请日：1971-09-09
申请人： LICENTIA GMBH
发明人： KLANK O
IPC分类号： H03J7/26 , H04B1/32
CPC分类号： H03J7/26
摘要： An automatic tuning circuit for a receiver which has a switch for initiating a search for a station delivering a signal exceeding a threshold level. The circuit is designed to maintain lock-on to such a station even when the received signal momentarily fades. A modification of the circuitry permits reversible tuning across the broadcast band. Fine tuning is achieved by a ratio detector which generates an error signal dependent upon frequency deviation.

7. 发明授权

US3737787A Electronic signal seeking system with rapid scan 失效
标题翻译：具有快速扫描的电子信号搜索系统
公开(公告)号：US3737787A
公开(公告)日：1973-06-05
申请号：US3737787D
申请日：1971-06-29
申请人： GEN ELECTRIC
发明人： WOLFRAM A
IPC分类号： H03J7/26 , H04B1/32
CPC分类号： H03J7/26
摘要： A signal-seeking tuning control system for use with a voltagecontrolled tuner. A ramp generator is operated manually to cause the tuner to sweep through a spectrum of channel frequencies. When the converted-frequency signal outputted by the tuner approaches a desired frequency range a discriminator produces an error signal for energizing a control system having three discrete states. when the discriminator output is within a fixed, narrowly defined range the control system arrests the operation of the ramp generator. Should the converted frequency drift beyond the narrow range, the discriminator produces an error signal which reflects the change in frequency, energizing an appropriate segment of the control to operate the ramp generator. Retrace means are provided for recycling the ramp generator when the voltage outputted thereby achieves a predetermined maximum or minimum value.
摘要翻译：一种用于电压调节器的寻呼调谐控制系统。手动操作斜坡发生器，使调谐器扫过频道频率。当由调谐器输出的转换频率信号接近期望的频率范围时，鉴别器产生用于激励具有三个离散状态的控制系统的误差信号。当鉴别器输出处于固定的狭义范围内时，控制系统会阻止斜坡发生器的操作。如果转换的频率漂移超过窄范围，则鉴频器产生反映频率变化的误差信号，激励控制器的适当段以操作斜坡发生器。当所输出的电压达到预定的最大或最小值时，提供回扫装置用于回收斜坡发生器。

8. 发明授权

US3644853A Voltage-controlled signal-seeking tuning system 失效
标题翻译：电压控制信号搜索调谐系统
公开(公告)号：US3644853A
公开(公告)日：1972-02-22
申请号：US3644853D
申请日：1970-11-23
申请人： ZENITH RADIO CORP
发明人： MA JOHN Y
IPC分类号： H03J7/26 , H03J3/18 , H04B1/32
CPC分类号： H03J7/26
摘要： A signal-seeking tuning system for a receiver having a voltagecontrolled tuner wherein a switching circuit, a low-leakage storage capacitor, and a metal oxide field-effect transistor are provided for applying a DC control voltage to the tuner and maintaining the applied voltage at the value corresponding to the selected signal so that the receiver remains tuned to the selected frequency irrespective of temporary loss of signal or receiver deenergization.

9. 发明授权

US3619492A Automatic fine tuning circuitry 失效
标题翻译：自动微调电路
公开(公告)号：US3619492A
公开(公告)日：1971-11-09
申请号：US3619492D
申请日：1969-06-02
申请人： RCA CORP
发明人： WHEELER WAYNE
IPC分类号： H03J7/02 , H03J7/26 , H03J7/30 , H04N5/50 , H04N5/44 , H04N5/60
CPC分类号： H03J7/26 , H03J7/305 , H04N5/505
摘要： A television system includes means for disabling the application of an automatic fine tuning correction voltage to the television tuner while the tuner''s tunable resonant circuits are being adjusted to tune from a first to a second frequency during channel change. During this period, the disabling means establishes a voltage across a variable capacitance device in the tuner''s oscillator tunable resonant circuit to approximate the crossover frequency voltages normally applied to the device from the automatic fine tuning circuits. The automatic fine tuning circuit operation is not affected during channel change, and the correction voltage output signals may be employed in a signal seeking system to help detect the presence of a desired television signal. Whenever the disabling means becomes operative, it actuates other circuitry to cause a muting of the television video and sound signals to occur, as well as the energization of a channel change indicator.

10. 发明授权

US3575662A Electronic search-tuning system 失效
标题翻译：电子搜索系统
公开(公告)号：US3575662A
公开(公告)日：1971-04-20
申请号：US3575662D
申请日：1968-06-21
申请人： ARVIN IND INC
发明人： DAVISSON ELDEN R
IPC分类号： H03J7/26 , H03J3/18 , H04B1/28
CPC分类号： H03J7/26
摘要： A circuit for use in electronically sweeping the tuning capacitors of a radio receiver through their capacitance range for successively tuning in each station. The sweeping action stops automatically and the value of the tuning capacitors are held constant at each station which is picked up by the radio. The sweep function is restarted to drive the tuner toward the next higher frequency station by means of a manually operated switch. The tuning capacitors comprise voltage variable capacitance diodes which are varied by means of a ramp voltage supplied by a generator. The generator is formed by a PNP transistor which charges a capacitor to provide the ramp voltage, and by a first field effect transistor which controls the base current of the PNP transistor. A silicon controlled rectifier is connected in parallel with the capacitor at the output of the ramp generator to discharge the capacitor after it has reached the peak voltage level required to vary the diode''s capacitance. In the case of an FM radio, said first field effect transistor has its gate electrode coupled for bias control by a ratio detector in the IF strip of the FM receiver. The output of the ratio detector causes the ramp voltage to level off, when a station is tuned in, by establishing the currents in the transistors so that the charging current to the ramp generator capacitor ceases, thereby holding constant the voltage to the tuning diode. In the case of an AM radio, the IF frequency developed in the AM receiver is passed through a series circuit formed by a narrow band filter, an amplifier, and a rectifier, to provide a DC voltage which is applied to the base electrode of the PNP ramp generator transistor. The DC voltage at said base electrode becomes more positive as a station is tuned in, and the PNP transistor decreases its conduction so that the ramp function ceases and the output voltage to the tuning diodes remain constant.

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