Abstract: This invention relates to a clock synchronization system capable of recording data and the time of initiation of data which is transferred from one location to another.

Abstract: An automatic white balance adjusting system for a color video camera employs a high luminance part of the luminance signal to control automatic gain controllers for the red and blue components of the signals.

Abstract: A line access apparatus for in-band communication includes a line coupler that functions as a high voltage isolation device and has a resonant frequency out of the signal transmission band. A carrier signal of about the resonant frequency is modulated at an in-band frequency to convey information across the line coupler.

Abstract: FM signals are demodulated with lower distortion and expenditure of less computing time by digitizing the signals using an A/D converter of predetermined sample frequency and down-converting the signals to their base band quadrature components. The quadrature components are delayed by one sample period, and the complex cross-product of current quadrature components and the delayed quadrature components from the immediately preceding A/D sample period is taken. The arctangent of the resulting cross-product is taken by calculating the ratio of the imaginary and real components thereof to produce a value which is representative of the original modulating signal.

Abstract: An improved method and system for the editing of unwanted content from transmitted program material. The system may be operated manually or automatically and its program recognition means may be positioned either locally at the controlled receiver or in a remote location. The system also has expanded editing capability to allow coordinated control of accessory devices and may be programmed without the necessity of an initial reception of unwanted content at the controlled receiver. It also simplifies and improves the reliability of previously disclosed methods for automatic program identification.

Abstract: There is disclosed an improved double detection receiver for detecting pulsed RF carrier signals. The receiver employs first and second channels with the first channel being a narrower band than the second channel. Each channel is associated with signal detection circuit to provide first and second detected output pulses. These pulses are summed or substracted to provide an output pulse indicating the sum or difference of each channel signal and this output pulse is appplied to a frequency comparator. One of the detected signals is also applied to a signal strength comparator whose output is gated via gating circuit with the output of the frequency comparator to provide a pulse present output for the presence of both input signals at said gating circuit. The use of the frequency comparators assures improved operation of the double detection receiver.

Abstract: A receiver includes a receiving circuit for receiving an electromagnetic carrier wave modulated by a message signal, a detector ciruit for separating the message signal from the carrier wave, and an output circuit. The detector circuit has a Q ratio sufficiently low that the detectable band width is more than twice the modulation frequency change. The detector output signal has a noise voltage level when no carrier is present that is higher than the voltage of the message signal with a carrier present. An output circuit senses the level of the detector output signal and passes signals with a voltage level below a predetermined level and otherwise blocks the output signal. The filtering of the output circuit is sufficiently low that its response time is faster than a tenth of a second. The output circuit includes a noisy input related to the detector output and a reference input.

Abstract: A narrow band laser transmitter comprising a semiconductor laser and an external optical resonator coupled by a coupling arrangement to the semiconductor laser characterized by the external optical resonator being a wavelength-selective fiber directional coupler in the form of a double core fiber whose cores have different refractive index discontinuities to the respective environments and different cross-sections. The laser transmitter is suitable for practical use, has a space-saving structure and is stable in operation.

Abstract: A fast tuning subsystem includes a tuner for selecting a channel, with a voltage controlled oscillator having a control input for determining the channel frequency the tuner selectively receives. A predictor supplies a selected predicted voltage signal from memory to the control input of the oscillator to slew the channel frequency at a rapid slew rate to the frequency corresponding to the selected predicted voltage signal. An error detector generates a tuning error signal indicative of the tuning error of the tuner off the frequency for the selected channel. The tuning error signal is combined with the selected predicted voltage signal to provide a control signal for adjusting the channel frequency to reduce the tuning error. The subsystem also similarly controls the amplitude of the received channel. The tuning subsystem automatically and from time to time changes the signals stored in the memory for respective channels to signals corresponding to the control signals applied after long term feedback.

Abstract: A video signal processing device rearranges line sequential signals included in a video signal into line simultaneous signals by detecting the kinds of information carried by them, respectively, for horizontal scanning periods; and adequately inhibits the line simultaneous signals from being produced.

Abstract: A manifold facsmile apparatus capable of selectively communication with a G3 analog facsimile apparatus and a G4 digital facsimile apparatus. The manifold apparatus includes an analog interface adapted for connection with an analog communication network and a digital interface adapted for connection with a digital communication network. The two interfaces are selectively connected to a communication control unit so that the apparatus is connectable to the analog network or the digital network. When called at the same time over the analog and the digital networks, the control unit gives priority to the digital network, Further, the control unit is capable of selectively performing data link control necessary for communication with the G3 analog terminal and data link control necessary for communication with the G4 digital terminal.

Abstract: An RF modulator is characterized by a gain adjusting circuit for gain adjustment incorporated with an RF amplifier for amplifying a carrier wave provided from a carrier oscillator and applying the same to a video signal modulator and to an audio signal mixer so that the gain of the RF amplifier is adjustable so as to adjust a difference in level of the carrier wave provided differently depending upon a resonance element being connected to the carrier oscillator.

Abstract: A decoder is described for a self-clocking code, e.g. a bi-frequency Manchester code. Transitions are detected in the encoded data and are clocked into a shift register by a clock having a frequency equal to a multiple of the data bit rate. A logic network is connected to the shift register so as to detect combinations of transitions representing encoded data bits "0" and "1". The logic network includes OR gate funnels which detect the transitions in a range of possible positions in the shift register, so as to allow for jitter in the input data signal. The circuit allows encoded data to be correctly decoded in the presence of jitter without the necessity for using a phase-locked loop.

Abstract: The system comprises subscriber stations (1, 2) each comprising a semiconductor laser generator (4) provided with means (3, 5) for modulating its laser output by means of transmit signals and a heterodyned detection system consisting of a photoelectric receiver (15) optically coupled to a local oscillator (17), an exchange (32) comprising a computer (37) and dual cavity semiconductor laser transmitters (39) connected to the outputs (38) of the computer, a passive optical distributor (31), and optical fibers (16, 8) connecting the lasers (4) and receivers (15) of each station with the optical distributor (31), on the one hand, and the lasers (4) of each station to the exchange (32), on the other hand, the computer assigning an optical frequency for each requested call and the laser transmitters of the exchange being operable to lock the transmit optical frequency of the calling and the called station lasers (4, 104), via optical fiber lines (8), on the frequency assigned by the computer.

Abstract: An encoding method for facsimile signal which is characterized by encoding data of a line selected out of the all lines of input facsimile signals in a manner of skipping over a predetermined number of lines according to a predetermined encoding method and by encoding the data of one of the thus skipped-over lines from a basic element of higher picture quality contribution judged with reference made to the data of the lines preceding of and/or subsequent to the encoding line which have already been encoded.

Abstract: An n channel birefringent multiplexer/demultiplexer consists of log.sub.2 n sequences of birefringent crystal elements in Solc-type filter configuration. The configuration of polarizing beam splitters have one such beam splitter before the first sequence, one such beam splitter after the last sequence, and solely one such beam splitter between adjacent sequences of birefringent elements. With such multiplexer/demultiplexer horizontally and vertically polarized components of an input beam are separated at the input beam splitter, independently traverse all of the sequences of the birefringent elements and are recombined to form output beams only upon reaching the output beam splitter.

Abstract: A radio reciever having a plurality of intermediate frequency amplifiers and a field intensity detector. A control circuit is provided which generates a control signal for reducing the gains of the intermediate frequency amplifiers in response to an output of the field intensity detector and when a voltage associated with an input field intensity has risen beyond a predetermined level.

Abstract: In a tuning circuit for AM receiver, tuning coils, oscillation coils and capacitance elements of an antenna tuning circuit, a radio frequency amplifier circuit, and a local oscillator circuit are accommodated in discrete shield casings for high frequency coils; and the discrete shield casings are disposed in a row and united with each other in the form of blocks, thereby eliminating the necessity to effect tracking adjustment.

Abstract: A camera formed with a solid-state image sensor (FTD) comprising a pick-up member (I), a storage member (M) and a shift register member (SR) with three output shift registers (SR1, SR2, SR3). The picture signals (S1, S2, S3) originating from the output registers must be combined in a monochrome camera or a color camera with the aid of several image sensors to a balanced composite picture signal (S123). To this end the camera comprises two control systems for fixing one and the same black level in the three picture signals. Three clamping circuits precede a signal combination circuit (11), two clamping circuits (2, 3) and one (4) operating at a control voltage (V1, V2) and a reference voltage (Vref), respectively. The two control systems (18, 22, 26, 2) and (19, 23, 27, 3) succeed the circuit (11), each system being formed with multiplier circuits (18, 19) for the supply of the picture signal (S123) and a clock pulse signal (CP1, CP2) associated with the relevant register (SR1, SR2).

Abstract: A multipath noise detecting circuit, which is not affected by ignition noise nor by the level of the antenna input voltage, includes a band pass filter having a mean frequency of 114 KH supplied with signals output from a FM demodulator, an AM detector for subjecting the signal input from said band pass filter to AM-detection, and a detector section for detecting as multipath noise the pulses included in the signal output from said AM-detector.