Abstract: A geothermal energy recovery system of improved efficiency makes use of thermal energy stored in hot, solute-bearing well water as it is pumped upward to the earth's surface through an extended heat exchange element for continuously heating a downward flowing organic fluid to a supercritical state. Some of the energy of the latter fluid is used within the well for operating a turbine-driven pump for pumping the hot, solute-bearing well water at high pressure and always in liquid state to the earth's surface, where it is reinjected into the earth in another well. The temperature difference between the upward flowing brine and the downward flowing organic fluid is maintained finite in a predetermined manner along the subterranean extended heat exchange element.

Abstract: Keyboard apparatus for an electronic musical instrument in which a particular code is assigned to each of keys of the keyboard and which is provided with a multiplexer circuit for detecting the depression of the key corresponding to an input code, means for sequentially generating the codes of the keys, memory means for storing the codes, a comparator circuit for comparing the outputs from the memory means and the code generating means to provide a coincidence signal when the both outputs are coincident with each other, a cycle control circuit for controlling a key ON cycle and a key OFF cycle in distinction from each other, and gate means for selecting the output code from the code generating means and the code of the memory means with the key ON cycle and the key OFF cycle to output to the multiplexer circuit. In the key ON cycle, the multiplexer circuit detects that the key having not been depressed yet is newly depressed, and stores it in the memory means.

Abstract: An elevator control system using an electric type floor selector is disclosed including a unit provided at at least one of the specific floors in the hoistway and for indicating the specific floor, units provided at the other floors than the specific floors and for indicating merely the floor, a detector provided at a car in which presence of both the units is detected and when the detector levels with the respective units the detector generates a signal corresponding to it, a floor indicator for indicating the floor at which the car actually stops by using the detected signal, and a stop permissible floor indicator for indicating the electrically calculated stop floor when the car stops. Comparison is made of the output of the floor indicator with the output of the stop permissible floor indicator. In the comparison, when these outputs are different, the car is moved to the specific floor.

Abstract: A plurality of tone signals corresponding to one note and having the same fundamental frequency and different harmonic components are modified in amplitude according to the shape of an envelope signal generated upon key depression and having an amplitude proportional to the key depression speed. One of the amplitude-modified tone signals is clipped at a predetermined level and then mixed with another amplitude-modified tone signal. The frequency spectrum of the resultant tone signal varies with time like a piano.

Abstract: An apparatus and a method is described for smoothing the acceleration and deceleration of an electric motor. This is accomplished by using a pair of brush springs (strong and weak) for each brush of an electric motor. At low speeds, the strong spring is retracted so that the force with which the brush is applied to the motor commutator is greatly reduced. This reduced frictional force improves the smoothness of the acceleration and deceleration characteristics of the motor at low speeds.

Abstract: In a chopper keyer electronic organ system, a sampling network samples the drawbar inputs to the chopper keyers in order to provide a separate channel of percussion. The drawbar lines for one or more of the footages are sampled and the sample signal is amplified and shaped to provide touch envelope percussion in addition to the sounding of the chopper keyer outputs. Alternatively, the chopper keyer outputs may be disabled and separate voicing such as for piano, harpsichord or steady tones provided via the drawbar sampling circuitry.

Abstract: A speed control device for use in a battery-powered vehicle wherein a shunt field current in a compound electric motor for driving the vehicle having a reactor connected in series therewith can be selectively controlled by using a variable resistor included in the circuitry and operatively interconnected to an accelerator pedal so that the resistance to the shunt field current may be changed accordingly to the extent of stepping-down on the pedal by the operator. The speed control device also features that a part of the vehicle's body structure of a ferro-magnetic material is used in combination as a core of the reactor so as to form a complete magnetic circuit for the reactor.

Abstract: A power equipment includes a rotor containing a storage battery or an assembly of storage batteries, a main driving electric motor, and a generator. The rotor does a fly-wheel's function. An inertia force of the rotor gained is efficiently utilized for driving of a car and moreover the excessive inertia force is converted into electric energy and stored in the storage batteries supplying efficiently an automobile with power.

Abstract: An air pressurizing and purging system for electrical equipment contained in compartments with safety checks and interlocks ensuring inhibition of main power circuit completion until purging pressure and fan operation are verified by a timer for a set period.System failure initiates a trip after a delay to open the main power circuit.Re-energization of the main circuit requires full purge and verification procedure once more.

Abstract: Apparatus for monitoring one or more electric signals representing movement of objects such as threads, strips, or the like during one or more surveillance time periods. A first signal detector detects the electrical signals representative of the movement. A trigger-signal-generating circuit generates a trigger signal upon detection of an electrical signal of at least a predetermined magnitude. A second signal detector is responsive to trigger signals to activate a surveillance circuit which indicates detection of a moving object. The apparatus includes a device for increasing the sensitivity of one or both of the signal detectors during all or part of the surveillance period.

Abstract: A sophisticated polyphonic instrument providing both additive and subtractive tone synthesis capabilities for generating a myriad of timbres, yet occupying a volume comparable to a toy accordion, is described. The unusually broad capabilities, for a small size synthesizer, is achieved through use of the novel LSI oriented circuits described in copending applications entitled "Electronic Organ With Multi-Pitch Note Generators", Ser. No. 610,733, filed Sept. 5, 1975, and "Automatic Arpeggio For Multiplexed Keyboard", Ser. No. 675,834, filed Apr. 12, 1976. The small size is made possible by use of LSI circuits in conjunction with a novel note keyboard arranged to select any note of the chromatic scale over a five octave range with only five keys, played by the right hand, and a novel chord keyboard, played by the left hand, arranged to select any one of ten chords based on the selected note as its root. The chord may be selected in its fundamental or either of two inverted forms.

Abstract: An offset compensated electronic current sensor and controller for automatically controlling the extension and retraction of a power antenna with the energization and de-energization of an automobile electronic search tune radio receiver.

Abstract: An electrical patch cord plug and jack assembly in which the plug is insertable into a selected one of a number of plug-receiving sockets in the jack and has a multiplicity of contact elements arranged in at least one longitudinally extending row for making and breaking various circuit connections in the jack.

Abstract: Herein described is an electronic control system for guiding a search unit of a nondestructive material tester over sloped or curved surfaces and shapes. More particularly described is the index system used on an indexing-scanning (inspection) device. An oscillator provides a preset number of pulses through an angle rate generator and direction logic to a binary coded decimal pulse counter. The counter keeps track of the input pulses provided thereto (each pulse represents an 0.1.degree. increment) therefore, its contents are indicative of the angle accumulated therein. A pair of read only memories provides the sine function and cosine function of the accumulated angle as a binary coded decimal trigonometric representation of the input angular degree. The signals therefrom control respective Y and Z rate generators whose input clock rate is indicative of the velocity along the curve of the pivot point of the search unit.

Abstract: The invention relates to a control device for D.C. motors operating by chopping the supply current. Said device comprises a voltage-frequency converter, a frequency divider, a monostable multivibrator, an analog-digital converter, a pulse down-counter and a bistable flip-flop, arranged to chop the direct current supply by means of a hit or miss control signal of which the cyclic ratio is a linear function of a control voltage U.

Abstract: The stiffness of a second-order damped servo system with position and velocity feedback circuits is increased without affecting the command response, damping factor, or natural frequency of the system by adding an acceleration feedback circuit and maintaining a specified relationship between the effective gain of the acceleration feedback circuit and the effective gain of the servo driver.

Abstract: A key assignor comprising a scanning means, a first clock memory, a second memory for releasing a switch information, a comparator, a priority circuit device, a means for inhibiting the write-in operation, and a means for extracting key codes. Key switches are divided into blocks to scan the latter without scanning all of key switches. Scanning time can considerably be reduced as compared to prior arts, thereby enhancing response greatly.

Abstract: An automatic musical instrument in which a chord discrimination and a musical performance circuit are arranged so that a comparator with multiple input terminals on one side, is connected to a memory circuit having multiple basic types of chords memorized. The comparator has multiple input terminals on the other side connected to key switches through a shift register. The comparator, furthermore, has a control electrode connected to a clock pulse generator which is connected, in turn, to multiple input terminals of the memory circuit, by way of two counter circuits. The latter have multiple output terminals connected, respectively, to two latch circuits. The comparator has an output terminal connected to control electrodes of the latch circuits. The musical performance circuit has a decoder connected to multiple output terminals of one of the latch circuits.

Abstract: A key code generator for electronic musical instruments which has a switch matrix circuit having a plurality of switches disposed at the intersections of two sets of buses, means for simultaneously applying signals to the switch matrix circuit from one of the two sets of buses to derive outputs from a plurality of blocks into which the buses of the other set are divided line by line, a memory for detecting the blocks that even one switch is in the on state from the bus outputs of the switch matrix circuit and temporarily storing signals of the detected blocks, a first priority selector for selecting block signals in a predetermined order of priority from the bus outputs and sequentially outputting the block signals with a predetermined clock pulse, means for inhibiting the block detecting operation during outputting from the first priority selector and applying the selected block signals to the buses of the detected blocks to sequentially scan only the detected blocks, a second priority selector for selecting

Abstract: An electronic musical instrument of a waveshape memory type comprising: a plurality of waveshape memories for storing waveshapes of different tone color, and means for variably mixing the outputs of the plurality of waveshape memories for generating tone signals of varying tone color. The mixing ratio of the different waveshapes may be varied with the lapse of time or according to the touch of the key operation or to the tone pitch.