Abstract:
The speed in RPM and the condition, of internal combustion engines is determined from the engine exhaust. An engine has x ignitions per second depending on engine speed, has y ignitions per revolution of the crankshaft depending on number of cylinders and whether two-stroke or four-stroke cycle, and has an engine speed in rpm equal to x times the constant 60/y. A light beam is projected from a source through the exhaust gas exiting from the engine to a photodetector to produce an electrical signal having a frequency which varies over a predetermined range determined by the operating speed range of the engine. A band pass filter passes the frequencies in the predetermined range to a phaselocked oscillator. The error signal developed to make the oscillator track the frequency of the signal varies in accordance with engine speed, and is applied to an electrical meter calibrated to indicate engine speed in revolutions per minute. Engine condition is indicated by an elapsed time counter measuring the time taken in an acceleration burst test to accelerate from a low or idle speed to a high or top speed.
Abstract:
An automatic scoring system for a plurality of bowling lanes is disclosed which employs a central control unit including a general purpose mini-computer having a read-only memory programmed to control the processor in the computation and display of bowling scores. The system is constructed to be easily expanded by adding a player console and an electronic module for each added pair of bowling lanes. Bowling score sheet information is displayed on cathode ray tube display devices at player and proprietor locations. Pinfall information may be introduced manually or by automatic pinfall sensors.
Abstract:
Apparatus for reproducing, on an electrically insulating film, an electrostatic charge pattern in an intensified form comprises two cylinders, disposed parallel to each other, and apparatus to reciprocate them in opposite directions of rotation with respect to each other. The image- bearing surface is on one cylinder; and the film, on which the charge pattern is to be reproduced, has opposite ends secured to the two cylinders, respectively. Grounded wetted sponges are disposed adjacent opposite surfaces of the film so as to first induce a monopolar charge pattern on the film, during one direction of rotation of the cylinders, and then to induce a bipolar pattern on the film, during an opposite direction of rotation of the cylinders.
Abstract:
A television channel address system incorporates ten touch buttons for digitally addressing a tuner to select a desired television channel. The numerical channel command is converted into an analog tuning voltage for tuning an associated voltage controlled tuner. Automatic fine tuning voltage developed in the television receiver modifies the developed analog tuning voltage for precisely placing the tuner on the desired channel frequency.
Abstract:
First and second amplifiers which consume varying currents are combined in such a manner as to require a common substantially constant power supply current. An energy storage device coupled to both amplifiers stores energy during periods of low current consumption by the first of the amplifiers. This stored energy is then provided for the second amplifier during periods of high current consumption by the first. A control circuit is provided which allows the first amplifier priority in fulfilling its current requirements.
Abstract:
A first tubulation which axially extends from a first envelope portion and a second tubulation which axially extends from an Lshaped ring, a radial extending portion of which is attached to a second envelope portion, are sealed by a cold compression seal and by brazing, respectively, to an annular ring of high compressive strength which is interposed in telescoped relation with the first and second tubulations.
Abstract:
A multiple base-emitter potential (VBE) supply is direct coupled via a semiconductor junction to the base electrode of a ''''grounded-emitter'''' amplifier transistor to provide forward bias to its base-emitter junction. The semiconductor junction functions as a resistance coupling element, coupling a source of input signal to the base-emitter junction of the amplifier transistor.
Abstract:
A type carrier presents characters serially to a print station which includes a recording medium. A signal controlled actuator at the print station is interposed in the print character path just before the desired character arrives and is struck on an angled cam surface by the character causing the character to strike the recording medium and forcing the actuator away from the character path. A binary encoder which issues signals determinative of what character is at the print station issues as many as 3/2 . 2n unique signals with n code tracks and n + 1 transducers.
Abstract:
Amplifier circuits including a transistor having its control element connected to one terminal of a first capacitor and having one end of its conduction path connected to one terminal of a second capacitor of greater capacity than the first capacitor. A pulse applied to the other terminal of the second capacitor is coupled through the capacitor to the transistor. The pulse is of sufficient amplitude and polarity to enable conduction through the transistor causing it to charge or discharge the second capacitor an amount proportional to the signal present at said first capacitor. The first capacitor may be the output of a first charge transfer stage register and the second capacitor may be the input of a second charge transfer register.
Abstract:
A dual mode deflection synchronizing system includes a resettable counter which generates noise-free internal synchronizing signals and signals representative of the interval during which external vertical synchronizing signals should be received provided the counter is properly synchronized. A sync signal verification detector is coupled to the source of external vertical sync signals and to a mode switch so that if the external signals arrive during this prediction interval as determined by the sync signal verification detector the system continues to operate in a synchronized mode on its internally generated synchronizing signals. If the external signals do not arrive during this prediction interval, the mode switch switches the system into a non-synchronized mode. A vertical sync signal detector which is also coupled to the source of external sync signals and to the mode switch begins to search for an external signal which has the time duration characteristic of an authentic external synchronizing signal. Until such a signal is received, the system continues to be synchronized by internal synchronizing signals generated by the resettable counter. When such a signal is received, the vertical sync signal detector resets the counter to correct its synchronization with the received external vertical synchronizing signal and toggles the mode switch to return the system to its synchronized mode of operation.