Abstract:
A variable function calculator utilizes a fixed program memory array such as a programmed read only memory in which a number of programs are stored depending upon the desired functions of the calculator. The calculator also includes a program counter, an instruction register, control decoders, jump-condition circuits, a clock generator, a timing generator, decoders, key input logic, a data storage array, an arithmetic logic unit, an output decoder, and a digit scanner which scans both the keyboard and display outputs. Aside from providing basic desk top calculator functions, the read only memory may be programmed so that the system provides metering functions, arithmetic teaching functions, control functions, etc. A preferred embodiment of the invention is capable of being fabricated as a monolithic integrated semiconductor system utilizing contemporary metal-insulator-semiconductor techniques.
Abstract:
A radio receiver receives input signals comprised of a plurality of frequency bands lying respectively within a plurality of non-overlapping frequency channels. The signals include an itermittently present reference frequency signal. The radio receiver includes an autolock circuit for measuring the frequency of the intermittently present carrier and for generating digital signals indicating its frequency. A digital processor has inputs coupled to receive the digital signals for calculating in response thereto a selectable demodulating frequency dependent upon the frequency of the intermittently present carrier.
Abstract:
An electronic calculator or microprocessor system of the type preferably having keyboard input and a visual display is implemented with a semiconductor chip having a hexadecimal/binary coded decimal format arithmetic unit for performing arithmetic operations on numeric data inputted by the keyboard further, the system preferably includes an input, an address register responsive to the input, a instruction word memory for storing a number of instruction words and addressable in response to the address stored in the address register, and instruction word decoder logic for decoding instruction words outputted from the instruction word memory and for controlling the arithmetic unit in response thereto. The arithmetic unit is operable in a first mode for providing an output from the arithmetic unit in binary coded decimal format and in a second mode providing an output from the arithmetic unit in hexadecimal format.
Abstract:
A pair of input field effect transistors are arranged as a differential pair having an electrode of each connected in common and connected in turn to a circuit common by means of a third field effect transistor. A pair of output field effect transistors are coupled to the input field effect transistors and have an electrode of each connected in common and coupled to the gate of the third field effect transistor, thereby providing an amplifier which relatively insensitive to change in the threshold voltage of the field effect transistors.
Abstract:
A thermal line printer includes a semiconductor chip for control of A .times. N heaters arrayed in N groups past which thermally sensitive paper is stepped B times in printing a line of characters in an A .times. B dot matrix. A sequential access memory stores N multibit words, one word for each character to be printed on a given line with a commutator cyclically to read words from the memory A .times. B times for each line to be printed. A ROM has an A .times. B dot matrix code therein for each available character. A time sequencer and decoder connected to the ROM is synchronized with the commutator to produce a different one bit output from the ROM each time each given word is read from memory. A set of N enable circuits leads from the ROM to N groups of heaters. A set of A enable circuits leads from the sequencer to A groups of heaters where one heater in each A group is from one of the N groups. A decoder interfaces the sequencer to the A groups of heaters and to the motor sequentially to enable the heaters in one A group for each memory cycle and in order through the A columns and B rows of the matrix.
Abstract translation:热线打印机包括用于控制以N组排列的A x N加热器的半导体芯片,其中热敏纸在A×B点阵列中打印一行字符是阶梯B次。 顺序访问存储器将N个多位字存储在一个给定行上的每个字符的一个字,循环地用换向器从每个行被打印的存储器读取字B×B次。 对于每个可用字符,ROM中具有A×B点阵码。 连接到ROM的定时器和解码器与换向器同步,每当从存储器读取每个给定字时,从ROM产生不同的一位输出。 一组N个使能电路从ROM引导到N组加热器。 一组A使能电路从定序器引导到一组加热器,每组A组中的一个加热器来自N组之一。 解码器将定序器与A组加热器和电机顺序接口,以使每个存储器周期中的一组A组中的加热器顺序通过矩阵的A列和B行。
Abstract:
A method of assembling, positioning, and making connections to a thermal printhead is disclosed. A substrate is provided upon which heating elements or mesas are mounted. Leads from these heating elements are continued on the same side of the substrate as the one on which the elements are located. The leads are brought to terminal pads where connections may be made to the logic circuit which selectively energizes the heating elements to form numerals or characters on heat sensitive paper. A flat flexible cable with conductor ends exposed is held in place so that the exposed conductor ends make contact with the terminal pads of one or more of such substrates. The substrates and cable are clamped together by two metal plates. This entire assembly is mounted on a spring-loaded pivot arrangement so as to hold the heating elements against the heat sensitive paper on an advancing platen. Connections may be made between the cable conductors and the printing logic to allow the heating elements to be energized.
Abstract:
An apparatus for controllably generating sparks is provided. The apparatus includes a spark generating device; at least two output stages connected to the spark generating device; means for charging energy storage devices in the output stages and at least partially isolating each of the energy storage devices from the energy storage devices of the other output stages; and, a logic circuit for selectively triggering the output stages to generate a spark. Each of the output stages preferably includes: (1) an energy storage device to store the energy; (2) a controlled switch for selectively discharging the energy storage device; and (3) a network for transferring the energy discharged by the energy storage device to the spark generating device. In accordance with one aspect of the invention, the logic circuit, which is connected to the controlled switches of the output stages, can be configured to fire the stages at different times, in different orders, and/or in different combinations to provide the spark generating device with output pulses having substantially any desired waveshape and energy level to thereby produce a spark having substantially any desired energy level and plume shape at the spark generating device to suit any application.
Abstract:
A variable function calculator utilizes a fixed program memory array such as a programmed read only memory in which a number of programs are stored depending upon the desired functions of the calculator. The calculator also includes a program counter, an instruction register, control decoders, jump-condition circuits, a clock generator, a timing generator, digit and FLAG mask decoders, key input logic, a register and FLAG data storage array, a decimal and FLAG arithmetic logic unit, an output decoder, and a digit scanner which scans both the keyboard and display outputs. Aside from providing basic desk top calculator functions, the read only memory may be programmed so that the system provides metering functions, arithmetic teaching functions, control functions, etc.. A preferred embodiment of the invention is capable of being fabricated as a monolithic integrated semiconductor system utilizing contemporary metal-insulator-semiconductor techniques.
Abstract:
An apparatus for controllably generating sparks is provided. The apparatus includes a spark generating device; at least two output stages connected to the spark generating device; means for charging energy storage devices in the output stages and at least partially isolating each of the energy storage devices from the energy storage devices of the other output stages; and, a logic circuit for selectively triggering the output stages to generate a spark. Each of the output stages preferably includes: (1) an energy storage device to store the energy; (2) a controlled switch for selectively discharging the energy storage device; and (3) a network for transferring the energy discharged by the energy storage device to the spark generating device. In accordance with one aspect of the invention, the logic circuit, which is connected to the controlled switches of the output stages, can be configured to fire the stages at different times, in different orders, and/or in different combinations to provide the spark generating device with output pulses having substantially any desired waveshape and energy level to thereby produce a spark having substantially any desired energy level and plume shape at the spark generating device to suit any application.
Abstract:
A dialysis machine has control circuit which detects changes in input water temperature and compensates the water heater. The control circuit detects changes in the conductivity of the dialysate concentrate and compensates the concentrate pump. Changes in supply voltage are detected and the outputs of the several sensors and the inputs to the pumps and heater comensated. The control circuit periodically calibrates the blood leak detector. In each of the feedback loops which service the heater and each of the pumps, the control circuit varies both the loop response time and the loop gain to compensate for changes in the dialysate flow rate. The resolution of the D/A converters which drive the pumps are enhanced by the control circuit by time modulating the LSB of the respective digital drive value. If any of the several sensed operating conditions varies significantly from the expected value, the control circuit terminates dialysis.