Abstract: A speed limiting system for a vehicle such as a forklift truck enables the travel speed of the vehicle to be limited without limiting maximum throttle position or adjusting a governor to limit maximum engine or motor power. The system can be used with combustion engine vehicles or electric vehicles. The system has a rate of travel sensor, preferably a rotation sensor sensing a rotation rate of the vehicle axle or wheel. A rate of travel signal is provided to either an analog or digital speed limiting control system which outputs a logic high speed control signal when the rate of travel signal exceeds a pre-set overspeed limit value for a selected time period. The speed control signal can be used to display or record occurrences of overspeed vehicle travel, or limit engine or motor power in that presence of the speed control signal. A warning system can also be incorporated to warn of high speed travel which is potentially approaching an overspeed condition.

Abstract: A reproducing apparatus for a recording medium recorded with compressed image data, audio data relating to musical accompaniment, character data relating to musical accompaniment, data showing the musical accompaniment scale, scale data for a scale change position and a position after a scale change and data showing a time passage relating to an audio signal relating to the musical accompaniment has an image reproducing unit, a reproducing unit, a signal generating unit and a mixer. The image reproducing unit decodes and reproduces image data read-out from the recording medium. The reproducing unit reproduces audio signals relating to musical accompaniment, character data and data displaying a scale from the recording medium. The signal generating unit generates a harmony signal for the audio signal outputted from the microphone based on data displaying the scale played back by the playback part.

Abstract: A robot welding device with a servo-valve controlled drive for the electrodes and an electrical control for the servo-valves with at least one transducer for actual data on the welding process and an interface for the measurements to a computer unit. By way of a holder program running on the computer, it is possible to freely select the set data assigned to the individual work phases. The comparison between the set values of the holder program and the actual data measurement sensors makes it possible, in conjunction with the interface for the servo valves, to complete the preselected work phases with precision.

Abstract: The window glass of the power window apparatus is controlled so as to be returned in the opening direction as much as a predetermined distance of, for example, 2 mm or so when the closing operation of the window switch is discontinued while the window glass is moving toward the full-closed position in a turning area predetermined within the movable range of the window glass excepting the full-closed position of the window glass.

Abstract: An inverter control apparatus for driving a polyphase AC motor for preventing abrupt changes in motor drive currents when switching of one phase is stopped. The apparatus includes a signal generator for generating duty signals of drive signals of respective phases on the basis of a generated reference waveform and a signal modifier for selecting one of the duty signals of one phase, holding it at a predetermined level, and modifying the duty signals of other phases according to the value required to hold the selected duty signal. On the basis of three-phase signal voltage levels, a decision is made on voltage fixing phase intervals by a phase decision circuit, and shift values are determined by an adder at every voltage fixing phase interval. Shift values are selected by a multiplexer according to the outputs of the phase decision circuit and added to triangular wave voltage. Resultant sum values are compared with the three-phase signal voltages to form a three-phase PWM signal.

Abstract: A multiplexor having a multiplexor control input terminal for selectively providing one of a plurality of conductor voltage levels to a conductor. The multiplexor includes a first switch, which is coupled to the conductor, for providing a first conductor voltage level to the conductor. A second switch is also included and coupled to the conductor for providing a second conductor voltage level to the conductor. To provide a selective discharge path for the conductor during switching, the multiplexor further includes a third switch coupled to the conductor. A discharge circuit is also provided and coupled to the conductor and the third switch for sensing the voltage level of the conductor to turn on the third switch as necessary at the early stage of switching among conductor voltage levels.

Abstract: A polyphonic electronic musical instrument is provided including a keyboard, an information processing system, e.g., a microprocessor-controlled computer system, and a tone generating device. The processing system processes data received from the keyboard and sends note-on/note-off commands to the tone-producing device. The processing system groups keys of the keyboard into "key sets". Keys within each set occupy different rows of the keyboard. The processing system commands the tone generating device to effectively produce not more than one tone corresponding with each key set at any one time regardless of how many keys within the set are depressed. A key set may operate in "sustain mode," in which depression of a first key produces a tone which sustains without interruption as long as at least any one key of the same set is in depressed position. Alternately, a key set may operate in "repetition mode.

Abstract: A musical tone controlling apparatus includes a tone generation instruction device, a detection device, tonal parameter generation device and a tone signal forming device. The tone generation instruction device outputs a tone generation start signal in accordance with a playing action of a performer. The detection device detects a movement or a state of the performer's body and generates a detection signal in accordance with the detected result. The tonal parameter generation device generates a first tonal parameter in accordance with the detection signal when the tone generation start signal is received and generates a second tonal parameter in accordance with the detection signal after the tone generation start signal has been received. The tone signal forming device controls the tone signal formation of a musical tone to be generated in accordance with the first tonal parameter and the second tonal parameter.

Abstract: A controller for an electric motor, wherein a differential signal for a speed instruction signal is obtained by a differential circuit, a control signal is obtained by a first speed control circuit, and both signals are summed to obtain a first torque signal. A simulated speed signal is obtained from the first torque signal by a torque simulating circuit and a mechanical system simulating circuit. A second torque signal is obtained by a second speed control circuit. The first and second torque signals are summed by an adder to obtain a torque instruction signal, and the electric motor is controlled so that the generated torque follows the torque instruction signal.

Abstract: A motor having a differential phase back EMF sensing circuit for sensing rotor position includes a stationary assembly with at least three windings. The rotation of the rotor induces a back EMF in the windings. A control circuit energizes each of the windings with a current according to a preselected sequence. A switch network is coupled to the windings and provides two back EMF signals as a function of the back EMF induced in two of the windings when the control circuit is energizing the third winding. A signal processor is coupled to the switch network and produces a difference signal representative of a difference between the two back EMF signals. An integrator integrates the difference signal to produce an integrated difference signal. The motor includes a reference signal generator which produces a reference signal and a comparator which produces a trigger signal when the integrated difference signal exceeds the reference signal.

Abstract: The present invention relates to a charging apparatus for a robot cleaner and a method for charging the robot cleaner by which the robot cleaner can be accurately induced to a power source supplier to receive a battery charge when a battery power source drops below a predetermined level. The apparatus includes a control unit for controlling an overall operation, a memory which stores a driving program including structures for various rooms for which cleaning operations may be performed, and a driving unit for moving the robot cleaner in forward, reverse, left and right directions according to control signals of the control unit. A travel distance detecting unit is provided for detecting a travel distance covered by the driving unit and a travel direction detecting unit is provided for detecting a travel direction varied by the driving unit.

Abstract: A power supply for standby circuits for an electrical consumer which separates both the electrical consumer and the power supply from the mains when in standby mode. The necessary power is supplied by a storage component backed up by an alternative voltage source. A voltage detector monitors the state of charge of the storage component and connects the circuit of the power unit to the mains as necessary. This power supply is suitable both for standby circuits of electrical consumers and for devices themselves or simply for control components and remote-control receivers on devices. Since a power unit is only connected to the mains when necessary, considerable energy savings are achieved.

Abstract: An overdrive circuit having a first current source which supplies an overdrive current and a second current source which supplies an ordinary current smaller than the overdrive current. A first circuit operates the first current source that supplies the overdrive current for a predetermined time period after the start of current supply. A second circuit stops the action of the first current source after the predetermined time period has passed and drives the second current source to supply the ordinary current as the driving current.

Abstract: A broadband communications network having an uninterruptible power supply. The power supply has one input connection to AC line voltage and another input connected to a gas powered electrical generator. The power supply contains an uninterruptible power supply module having a controlled ferroresonant transformer and a battery. The power supply also contains a bypass module having a controlled ferroresonant transformer. Switches are provided to allow either of the inputs to be connected to either the UPS module or the bypass module for the generation of power signals for supplying power to the broadband communications network.

Abstract: A power supply system including a thermal current limiting device operating due to high temperatures. At predetermined temperatures, the device acts to incrementally control the output of a power supply. An implementation of the device may be found in a voltage or power regulator wherein a constant output voltage or power is desired. As temperature increases, the power supply system is not switched off, rather current output is adjusted in a controlled manner thereby eliminating the need for the device to be entirely shut down for a time period. A back-up battery is used to provide supplementing current needed by the load.

Abstract: A musical tone signal generating apparatus for electronic musical instrument, comprising; (A) wave storage means for storing specific wave data W.sub.j where 0.ltoreq.j.ltoreq.N-1, and differential wave data .DELTA.WD.sub.n where n=1, 2, . . . N-1 and n.noteq.j, the specific wave data W.sub.j being produced based on specific sampling data D.sub.j, the differential wave data .DELTA.WD.sub.n being obtained by deducting sampling data D.sub.n-1 from sampling data D.sub.n, wherein sampling data D.sub.i consisting of the sample data D.sub.j and D.sub.n are obtained by sampling a musical tone wave at sampling points P.sub.i where i=0, 1, 2, . . . N-1; (B) readout means for consecutively reading out the specific wave data W.sub.j or the differential wave data .DELTA.WD.sub.n from the wave storage means; (C) temporary storage means; (D) decoding means for generating sampling data YD.sub.j and storing the sampling data YD.sub.j in the temporary storage means when the readout means reads out said specific wave data W.

Abstract: An audio synthesis circuit is disclosed that can generate multiple audio tones, or operators, each having different harmonic characteristics. The audio synthesis circuit can be used in a time-multiplexed fashion so that the multiple audio tones, or operators, can be computed in a single audio synthesis cycle and then combined to form voices/channels. Each audio synthesis cycle can be divided into as few as 0 or as many as 48 time slots, meaning that as many as 48 operators can be played simultaneously. The disclosed circuit provides a preset organization of the 48 operators into 12 2-operator channels and 6 4-operator channels. These channels can be played in various system modes, including backward-compatible 2- and 4-operator modes in which the programming of the operators is restricted, and an enhanced mode, in which the operators can be freely programmed. In the backward-compatible modes, two operators of each 4-operator channel are constrained to be duplicates of a respective 2-operator channel.

Abstract: A rotor position encoder for an electric motor includes a discate member mounted to rotate with the rotor shaft. The encoder has a set of radially extending features formed with angularly evenly spaced leading edges and unevenly spaced trailing edges. The leading edges induce a signal in a sensor that corresponds to the relative timing of power switches for each motor phase, The trailing edges define a cyclical code by which motor controlling circuitry is able to determine the phase of rotation of the rotor and thus establish the correct power switch actuation sequence. An electric motor control system and methods of starting electric motors also provide significant advantages.

Abstract: The method and the arrangement for temperature monitoring of universal motors based upon a resistance measurement of a field winding, wherein a DC current component of low magnitude is superimposed upon the motor current for elimination of the complex values of the AC current impedance, and wherein the voltage drop in the field winding is amplified and freed from the AC voltage component and is compared as a DC voltage component proportional to the ohmic resistance of the field winding to a temperature independent DC voltage component, which is obtained in an analogous manner from a current measuring shunt, through which the motor AC current, including the superimposed DC current component, flows.

Abstract: A control circuit adapted to control a motor includes a first circuit part for generating an excitation current to be supplied to the motor and having a predetermined period that is dependent on a predetermined rotation period of the motor, and a second circuit part for superimposing on the excitation current pulses having a period that is small compared to the predetermined period of the excitation current.