Abstract: A color television camera is disclosed in which level detector circuits are supplied with a plurality of color signals; a control signal, produced by the level detectors when any one of the color signals exceeds a predetermined level, is applied to an automatic gain control circuit connected in a transmission path for a picked up output; and the automatic gain control circuit is supplied with a control signal based upon a luminance signal when the former-mentioned control signal is not obtained.

Abstract: An SWD structure is employed in an FM receiver for signal demodulation and band limiting. An FM signal is applied to the input of an SWD patterned for bandwidth limitation. Two SWD output channels characterized by predetermined differential delays of the modulated input signal are amplitude limited and mixed to produce an audio modulation component.

Abstract: A transmitter transmits data through a communication channel to a receiver and the communication channel provides the data with delay and attenuation distortion. The receiver includes an equalization network having taps with multiplying coefficients for correcting the delay and attenuation distortion of the data. In response to a special sequence of the data, either specially generated by the transmitter or detected in random data, the receiver generates signals for updating the multiplying coefficients of the taps and these signals are introduced to the equalization network through a gate enabled by a special sequence detection network. This apparatus provides for the adjustment of the equalization taps in an extremely short period of time such as 5.83 milliseconds.

Abstract: A low power consumption, compact portable stereo radio transmitter and a receiver therefor, the transmitter having two audio processing channels each for receiving inputs from two stereo pickup stations and including amplifier circuits with selector switches providing a mode of even harmonic generation, a mode of odd harmonic generation, and a mode of undistorted amplification, a 38 KHz oscillator, flip flop coupled to the oscillator to provide a 19 KHz pilot signal, a difference amplifier and a balanced mixer to produce a double-sideband suppressed carrier signal centered on 38 KHz, and an amplifier for combining the balanced mixer output, the pilot signal and the two channel output and modulating a carrier signal. The receiver includes amplifier, detector, and decoder circuitry to receive the radio signals from the transmitter and produce stereo audio signals for driving a standard stereo amplifier.

Abstract: An AM/AGC weighted diversity combiner utilizing the AGC and AM voltages f the AGC loops of a pair of receivers for generating an optimum weighting signal or combining ratio.

Abstract: The present invention relates to a method and a device for generating line rasters in an infra-red imaging system (IR-imaging system) comprising an IR-camera and an image representation unit; the IR-camera being provided with a frame scanning unit comprising a frame trigger unit; and with the line scanning unit comprising a line trigger unit, and the line trigger frequency being determined by using the rotational speed of the line scanning unit as a reference signal for the rotational speed of the frame scanning unit.

Abstract: A document for transmission has ruled lines such as borders printed at predetermined locations thereon which do not constitute usable information. The main scan direction is perpendicular to the ruled lines. Each main scan line is pre-scanned to determine if the line contains information other than the ruled lines, and the main scan line is scanned again for transmission if information is encountered and skipped if information is not encountered. A gating signal is generated in synchronism with the pre-scanning step, but the gating signal is suppressed while the portions of the main scan line intersecting the ruled lines are being pre-scanned. If the gating signal and electrical signals resulting from pre-scanning usable information contained in the main scan line are sensed simultaneously, the line is scanned for transmission.

Abstract: A transceiver, adapted for use as either a master or a slave in a duplex pair, has a single, voltage-tunable, solid-state oscillator to provide the carrier frequency wave, a small portion of which is mixed with the received wave and applied therewith to a single ended mixer; an automatic gain-controlled loop cancels transmitter input modulation from the receiver output. The desired oscillator carrier frequency of the master transceiver is locked to a frequency within the pass band of an RF filter at the receiver input and separated from the center frequency of the filter by one-half the receiver IF frequency. The slave transceiver is first locked to a frequency within the pass band of the filter on the opposite side of its center frequency and separated therefrom by one-half the IF frequency (the slave thus offset from the master by their common IF frequency).

Abstract: A receiver protection arrangement in which a voltage dependent on aerial voltage and a voltage dependent on aerial current are aggregated and applied to means responsive to a predetermined aggregate level to effectively short circuit the aerial lead. Additional means may be provided to dissipate energy in the input stage of a protected receiver to cause a reduced impedance to be reflected across the output of the protective arrangement.