An apparatus for detecting a rapid variation in an input quantity, such as the compressor delivery pressure of a gas turbine engine has a generating arrangement which provides an alternating signal whose magnitude is dependent on the value of the input quantity. The generating arrangement includes an automatic gain control and associated delay device so that the alternating signal has a substantially constant value except when there is a significant reduction in the input quantity in less than t...

A phase lock loop employs a frequency discriminator having a relatively slow response to pull a voltage controlled oscillator into frequency lock with an input signal. After frequency lock the output of the frequency discriminator is nulled and a phase detector becomes effective to maintain phase lock. The frequency discriminator utilizes an operational amplifier to which both the input and oscillator signals are capacitively coupled through respective oppositely poled diode gates. A feedback ca...

A highly frequency selective circuit that includes a twin-T notch filter connected in the feedback path of a transistor is disclosed. Also included in the feedback path is an isolation network formed of a pair of emitter coupled transistors. One of the isolation transistors is fed by the feedback signal from the twin-T notch filter and the other is fed by the input signal to the overall frequency selective circuit.

A phase comparator circuit suited for use in a PLL circuit and for integrated circuit implementation comprises a differential amplifier having a common current path to be turned on and off by a reference signal, means for applying a pedestal or ramp wave signal to be phase-compared with the reference signal to one input terminal of the differential amplifier, and means for branching a current from one of current paths of the differential amplifier. The phase comparator circuit further comprises ...

A concealed toilet bowl contained in a base embedded in a wall, comprising a driving mechanism to move the toilet bowl out of the case for use or into the case for concealing same, a blower, a water tank and pipes for flushing water into the toilet bowl and exhausting it out.

An apparatus for encoding a plurality of image data series and decoding a plurality of encoded image data series includes an interface control circuit for executing data read/write operation from and to a memory area, an encoding/decoding circuit for selectively executing encoding of image data of one series written into the memory area or decoding of encoded image data of one series, and a plurality of registers for giving an instruction of processing to the encoding/decoding circuit wherein th...

An apparatus for encoding a plurality of image data series and decoding a plurality of encoded image data series includes an interface control circuit for executing data read/write operation from and to a memory area, an encoding/decoding circuit for selectively executing encoding of image data of one series written into the memory area or decoding of encoded image data of one series, and a plurality of registers for giving an instruction of processing to the encoding/decoding circuit wherein th...

An articulate vehicle comprises a first frame disposed at one of front and rear portions of the vehicle and a second frame disposed at the other of front and rear portions of the vehicle. The first frame supports a first transaxle apparatus supporting a first axle. The second frame supports a second transaxle apparatus supporting a second axle. Proximal ends of the frames with respect to the vehicle are coupled to each other through a coupling part so that the first and second frames are rotatab...

A articulate vehicle comprises a first frame disposed at one of front and rear portions of the vehicle and a second frame disposed at the other of front and rear portions of the vehicle. The first frame supports a first transaxle apparatus supporting a first axle. The second frame supports a second transaxle apparatus supporting a second axle. Proximal ends of the frames with respect to the vehicle are coupled to each other through a coupling part so that the first and second frames are rotatabl...

Apparatus is described for eliminating monochromatic interfering frequency components of seismic signals detected during the course of seismic exploration comprising an electrical circuit for producing a monochromatic nulling signal that has the same frequency as the interfering signal. The monochromatic nulling signal is produced by generating a truncated triangular wave having the same period as the interfering signal and filtering the truncated triangular wave to remove all components thereof...