摘要:
A descrambler system for a CATV television signal having IF audio, video and synchronizing components that is scrambled by a first amplitude modulation of the IF audio component and a second amplitude modulation of the combined audio, visual and synchronizing components by a key signal having a frequency that is an integral multiple of a 15.75 KHz horizontal synchronizing frequency includes a demodulator responsive to the scrambled signal, a key signal detecting circuit coupled to derive the key signal from the audio portion of the demodulator output and a dynamic limiter circuit coupled to remove noise from the key signal and provide a noise free sine wave key signal to the demodulator. The dynamic limiter circuit is an inexpensive circuit providing the signal processing characteristics of a much more expensive narrow band filter. It includes a current limiter circuit driven by a current source in proportion to the magnitude of the scrambled signal to provide a square wave signal at the key signal frequency that is proportional in magnitude to the scrambled signal and a simple filter that converts the square wave signal to a sine wave key signal that is used by the demodulator circuit with the exact shape, frequency and amplitude characteristics for noise free unscrambling of the scrambled CATV signal.
摘要:
The semiconductor laser device includes a signal light diffraction grating, and a light receiving portion having a pair of photodiodes extending as two strips with a parting portion or a zonal gap interposed therebetween and receiving a focus error detecting beam from the signal light diffraction grating. The light receiving portion is arranged such that its longitudinal direction is orthogonal to the direction of diffraction grooves of the signal light diffraction grating. The pair of photodiodes is arranged such that a spot of the focus error detecting beam moves, due to temperature changes, in a range essentially limited to the parting portion therebetween. Thus, a semiconductor laser device and an optical pickup apparatus suppressing focus errors due to temperature changes and preventing reduction in signal strength can be obtained.
摘要:
A distance monitoring system of a vehicle monitors a distance to a preceding vehicle traveling directly ahead of the vehicle to determines whether the preceding vehicle is decelerating by comparing a change in the vehicle speed with a reference value which is varied according to various driving condition in relation in particular to dangers such as collisions against the preceding vehicle.
摘要:
A rear-wheel steering apparatus for a vehicle includes an output shaft for coupling rear right and left wheels through one shaft, a cam member which is rotatable about an axis extending in a direction perpendicular to the output shaft, a pair of roller members which are provided to the output shaft and are in rolling contact with opposing portions of the outer peripheral surface of the cam member, and an input shaft for rotating the cam member in accordance with a turning amount of front wheels.
摘要:
In a CATV system, channel identifying data is incorporated in each transmitted channel, and subscriber terminals return such data to the CATV center to indicate the channel actually being received. Further, the channel identifying data is compared to the channel selected, and when a proper comparison exists a sweep voltage is held at a predetermined level for the particular channel, to control frequency conversion at the terminal.
摘要:
Video signals for television are effectively scrambled and may later be descrambled without the presence of annoying visual disturbances by the introduction of a superposed distorted sine wave in synchronism with the horizontal synchronizing signal, in a "gray sync" mode of operation. Thereafter, the received signal may be normalized and descrambled by compensatory and synchronous modulation. Advantageously, the sinusoidal variation may be imposed both upon aural and visual components of the signal, and the aural AM signal may be utilized as a reference in descrambling the visual component.
摘要:
In an embodiment of a flash apparatus, a semiconductor laser device is used as a flash-use light source. Laser light beams are approximately evenly scattered by a reflector plate whose reflection surface is formed of Ag coarse film, whereby illumination of a wide range and safety are secured. In an embodiment of the semiconductor laser device, the semiconductor laser device is disposed such that a longitudinal direction of an imaging area 20a of a camera and a wide direction of far-field patterns 11a1, 12a1 and 12b1 of laser light emitted from the semiconductor laser device match.
摘要:
An obstacle detection apparatus for a motor vehicle detects another vehicle traveling in front of the vehicle as an obstacle. The apparatus has a first unit, providing a course on which the vehicle is supposed to travel, a second unit, providing a reserve course located outside of the course, an obstacle detector detecting the other vehicle traveling in the course or the reserve course as an obstacle, and an obstacle detection continuation unit continuously detecting the other vehicle until a predetermined condition has been satisfied when the other vehicle moves from the course to the reserve course.
摘要:
A ventilated disk used in automobiles and industrial vehicles includes a pair of mutually opposing disk portions, a plurality of radially extending ribs integrally formed with the disk portions and interposed therebetween, and at least one annular damping member. Formed in each rib is at least one radially extending oblong hole which passes through the rib in the circumferential direction. The oblong holes in the respective ribs form at least one circular array along a circular whose center is the center of the disk. The annular damping member(s) extends/extend through the oblong holes forming the annular array(s) and is in contacting engagement with the outer end portion and side portion of each ablong hole.
摘要:
An egress-start determining device determines a start of egress of a passenger seated in a seat of a vehicle. A completion determining device determines completion of a driver's head moving out of a door opening of the vehicle after the start of egress of the passenger. A seat-sitting-face height adjusting device adjusts a height of a sitting face of the seat in such a manner that the height is adjusted to a first height during a time from the start of egress of the passenger to the completion of the driver's head moving out of the door opening of the vehicle, and the height is adjusted to a second height after the completion of the driver's head moving out of the door opening of the vehicle.