Abstract: An electronic odo/trip meter for automobiles has a display for displaying a travel distance, a counter for enumerating the travel distance data, a non-volatile memory which is provided in the counter so as to prevent elimination of the travel distance data, and a control circuit which controls data transfer and includes a first detection circuit for detecting voltage-drop of a power supply and a second detection circuit for detecting resumption of the power supply. In the device according to the invention, the travel distance data of the counter can be stored in the non-volatile memory only when the first detection circuit detects a drop in the power supply, and the travel distance data of the non-volatile memory can be transferred into the counter only when the second detection circuit detects the resumption of the power supply.
Abstract: An automatic design system of a logic circuit system includes a storage for storing information about structures and functions of known basic circuits available for a circuit system to be designed, an input device for receiving design specification information about the structures and functions of the circuit to be designed, and a synthesize section for combining the known basic circuits stored in the storage so as to synthesize the desired logic circuit satisfying the design specification information.
Abstract: A mailing system for metering batches of mixed weight mail. The system includes a demand feed for singulating mailpieces, a weighing module for weighing the singulated mailpieces and determining the appropriate postage amount and a postage meter responsive to the weighing module for metering such singulated mailpieces with the appropriate postage amount. A transport system sequentially transports singulated mailpieces from the feeder to the weighing module when the postage meter is set then stops during the weighing period. The postage meter is set for the next sequential mailpiece only after weighing and metering are both completed. In another embodiment a mechanical buffer is provided between the weighing module and the meter to allow overlapping of weighing time with meter setting time.
Abstract: A configuration for a franking machine includes a central control in the form of a processor. A drive of the franking machine, a printing drum, an interface component for connection to drives of peripheral devices disposed upstream and downstream of the franking machine and a common keyboard are all connected to the processor. The common keyboard enters an amount to be printed and controls the franking machine for reducing mechanical wear and noise and for saving energy. Another control in the form of a timing member is associated with the processor. The timing member places the drive of the franking machine into a standby position by generating a switch-off signal if no material to be stamped is touching the printing drum and no value has been entered through the keyboard during a given monitoring time period preset by the timing member. The timing member also controls the drives of the peripheral devices through the interface component.
Abstract: The present invention comprises a circuit for measuring the capacitive differences of small capacitors. The circuit comprises a reference capacitor and a sensor capacitor. Connected to one of the plates of each capacitor is a switch which connects the capacitors to one of two reference voltages. The other plate of the capacitors are connected to an input terminal of a voltage comparator. The comparator compares the input voltage with a third reference voltage. Differences in voltages detected by the comparator are applied to a feedback loop for generating an offset voltage at the input terminal. The offset voltage applied at the input terminal is proportional to the capacitive difference between the reference capacitor and the sensor capacitor. The feedback loop comprises a successive approximation register for digitizing the offset voltages and a digital to analog converter for converting the digitized voltages into analog voltages which are applied at the input terminal.
April 22, 1987
Date of Patent:
August 22, 1989
Massachusetts Institute of Technology
Hae-Seung Lee, Roger T. Howe, Joseph T. Kung
Abstract: In an ink-jet recording device in which a nozzle is so excited that ink droplets jetted from the nozzle are alternately separated into large-diameter ink droplets and small-diameter ink droplets, and recording ink droplets to be stuck onto the recording surface are made to fly straight while nonrecording ink droplets are charged and deflected to be retrieved by a gutter, there are provided a nonrecording ink droplet sense circuit and a correction signal generator circuit for generating correction charging voltage when an ink droplet to be controlled is generated provided that the preceding ink droplet is a nonrecording ink droplet and the ink droplet to be controlled is a recording ink droplet.
Abstract: The invention comprises a tachometer for aircraft for determining engine operating parameters from magneto signals from right and left magnetos. A signal conditioning circuit receives ignition signals from at least one magneto and modifies the ignition signals to provide a right and left train of input pulses for the microprocessor. The microprocessor follows a stored program to develop filtered quantitites depicting right rpm, and left rpm for respective right and left engines, or right and left magnetos of a single engine. The maximum rpm achieved during operation is also stored, along with the difference between the right and left rpms, the change in rpm over a period of time, and average rpm of two engines. A mode switch selects from right rpm, left rpm, maximum rpm, difference rpm, change in rpm over time, and average rpm for display on the display means. A method for calculating highly accurate engine RPM is disclosed.
Abstract: A method of testing electrical continuity and so forth of distributing cables which are rigged in a plurality of mutually coupled vehicles of an electric, diesel or steam railroad train for electrically connecting monitored apparatus in the vehicles to monitors installed for watching and checking such monitored apparatus.
Abstract: A postal rate memory module is disclosed. The module includes a memory which stores current postal data and an integral battery. The module may be used in a postal scale which includes a scale for determining the weight of an item to be mailed, a memory module for storing postal rate information, a data entry apparatus for entering postal information relating to the item and a processor operatively connected to; the scale, the postal rate memory module and the data entry apparatus, for determining the appropriate postage for the item in accordance with the weight, the entered postal information and the postal rate information. The battery has sufficient capacity to provide at least a significant portion of the power supply and is automatically replaced each time the memory module is replaced with a module containing updated postal rate information so that the user is not burdened with the need to stock and replace batteries.
Abstract: Bit pattern data stored in an external memory unit is read out under the control of a microprocessor for being compressed in a data compressing unit and then stacked in a memory unit. At the time of storing data in the memory unit, all the stripe data constituting one chip frame are written in a state capable of being made high speed sequentially accessible at the time of the read-out without need of dividing a memory bank into portions for the individual stripes but by continuously using the address space covering the entire memory areas. This is effected by a memory management unit and a memory module management unit provided in the memory unit.