Bizarre Patents
Mouse device with a built-in printer
A mouse device for use as an input device of a computer is provided that includes a housing in which recording paper is loadable, and a printer unit provided within the housing for printing on the recording paper print information received from the computer.
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| Number | Title | Issue Date |
| 8174311 | Switching amplifier A switching amplifier (200; 300; 400; 500) comprising: a switch (202; 302) configured to electrically connect and disconnect a first pin (202a; 302a) of the switch (202; 302) to a second pin (202b; 30... | 05/08/2012 |
| 8164381 | Open-loop line driver control method and apparatus According to an embodiment, a circuit includes an amplifier and an open-loop control system. The amplifier has an output stage for amplifying a signal, a power supply for driving a supply voltage of the output stage to different voltage levels responsive to being mo... | 04/24/2012 |
| 8164382 | Concept, method and apparatus of improved distortion switched-mode amplifier Systems and methods for switched-mode amplifiers having improved harmonic distortion are disclosed. High order in-band filtering is enabled without undue trade-off of distortion due to intermodulation/aliasing. A pre-modulation block is introduced, deployed between ... | 04/24/2012 |
| RE43265 | Reduced output topology for multi-reference switching amplifiers A method and attendant circuitry reduces the number of regulatory and switching devices in a multi-reference switching amplifier. In the preferred embodiment, multiple independently-modulated effective references are summed at a load through use of both linear and s... | 03/27/2012 |
| 8138827 | Filter compensation for switching amplifiers Embodiments of the present invention provide methods and systems for limiting bipolar current flow in a switching amplifier. Embodiments of the present invention are directed to a multi-referenced switching amplifier. In some embodiment, the switching amplifier is a... | 03/20/2012 |
| 8115541 | Three-level half-bridge pulse-width modulation amplifier and method of driving the same A three-level half-bridge PWM amplifier includes a PWM generator and an output stage. The PWM generator changes a width of a pulse at a first level or a second level according to amplitude of an input signal and outputs a three-level PWM output signal having the fir... | 02/14/2012 |
| 8115543 | Mixed-signal transmission circuit for switching power amplifiers The invention relates to an upstream unit (1) for a switched power amplifier (2) for a high-frequency transmission circuit (16). The upstream unit (1) supplies a pulse-length modulated HF pulse signal (22) to the switched power amp... | 02/14/2012 |
| 8115542 | Variable frequency class-D amplifier, control method thereof, and ramp generator therefor A class-D amplifier includes a ramp generator to provide a ramp signal having a frequency varying with an audio input signal, and a modulator to convert the audio input signal to a pulse width modulation signal according to the ramp signal for a driver to drive a lo... | 02/14/2012 |
| 8115540 | Amplifying apparatus, method of output control and control program To provide, for example, a pulse input type power amplifying apparatus that can be operated at low voltage and low power, effectively suppressing generation of harmonic component. The amplifying apparatus includes at least two amplification circuits, one and ... | 02/14/2012 |
| 8111099 | Multi-channel audio playback apparatus and method A multi-channel audio playback apparatus including a channel interface, a first switching amplifier and a second switching amplifier is provided. The channel interface is used to receive multi-channel digital data and generate first channel digital data and second c... | 02/07/2012 |
| 8081028 | Systems and methods for improved over-current clipping Systems and methods for implementing over-current protection in amplifiers are provided, including systems, methods and devices for specifying a clip level at which to clip an audio signal in response to an over-current condition being detected. In an embodiment, th... | 12/20/2011 |
| 8076971 | Sampling frequency reduction for switching amplifiers The present invention is directed toward providing a system and method of reducing RF interference in switching amplifiers without degrading performance. In one embodiment, the sampling rate of coarse high voltage modulated pulsewidths are decreased relative to the ... | 12/13/2011 |
| 8067980 | Pulse width modulation circuit and class-D amplifier comprising the PWM circuit A pulse width modulation (PWM) circuit comprises a first integrator (g m1) with a first feedback capacitor (C1), a second integrator (gm1) with a second feedback capacitor (C2) and a comparator (A0) having a first input (V... | 11/29/2011 |
| 8063697 | Self-oscillating driver circuit A self-oscillating driver circuit comprises a driver stage, a feedforward path which is coupled to an input of the driver stage, and a feedback path which couples an output of the driver stage to an input of the feedforward path. The feedforward path comprises a fee... | 11/22/2011 |
| 8058927 | Amplifier modulation method and apparatus A signal is modulated by generating a pulse-width modulation signal and applying the pulse-width modulation signal to an input of a switched-mode amplifier. An output of the amplifier is coupled to a filter operable to impart either differential mode oscillations or... | 11/15/2011 |
| 8049557 | Self oscillating class D amplification device An amplification device, comprising a device input receiving a device input signal, an amplifier unit comprising a zero crossing detector unit, an output filter and a lead-lag compensation network. The zero crossing detector unit compares the device input signal wit... | 11/01/2011 |
| 8044714 | Device and method for amplifying pulsed RF signals Device and method are described for amplifying pulsed RF signals, comprising one or more transistors, each comprising a drain, a gate and a source. A device synchronizes the supply for the drain with an RF pulse. ... | 10/25/2011 |
| 8044715 | Method and system for increasing sampling frequency for switching amplifiers The present invention is directed toward providing a system and method of reducing RF interference in switching amplifiers without degrading performance. In one embodiment, the sampling rate of coarse high voltage modulated pulsewidths are increased relative to the ... | 10/25/2011 |
| 8040180 | Operational amplifier capable of compensating offset voltage An operational amplifier capable of compensating offset voltage includes an input stage circuit having a positive input end, a negative input end, a first current output end, and a second current output end, for outputting current corresponding to voltage received b... | 10/18/2011 |
| 8040181 | Time delay compensation and pulse width correction A system, method and apparatus is provided for pulse width correction in a power driver. In an embodiment, an apparatus includes an operational amplifier having an input and an output. The input of the operational amplifier is coupled to receive an input pulse signa... | 10/18/2011 |
| 8030994 | Driver for an inductive load A driver supplies an output voltage to an inductive load. The driver includes an input to receive a pulse width modulated control signal having a controllable duty cycle within a predetermined range. A first switch circuit receives a first switch signal to supply a ... | 10/04/2011 |
| 8022756 | Output circuits with class D amplifier Output circuits using pulse width modulation (PWM) and/or pulse density modulation (PDM) are described. In one aspect, a PWM output circuit includes a PWM modulator that operates based on a square wave signal instead of a sawtooth or triangular wave signal. In anoth... | 09/20/2011 |
| 8022757 | Class D power amplifier A class D power amplifier includes: a signal input terminal for receiving an analog signal; an analog signal processing unit for amplifying the analog signal; an integrating circuit for integrating the analog signal received from analog signal processing unit; a PWM... | 09/20/2011 |
| 8008969 | Single supply class-D amplifier Traditionally, switching amplifiers (i.e., class-D and class-G) with negative supply rails had issues with direct current (DC) power loss, included large external capacitors, had a comparative reduction in efficiency, and oftentimes included separate power managemen... | 08/30/2011 |
| 7999610 | Class D amplifier capable of setting restraint power A Class D amplifier capable of setting restraint power is provided, which comprises: an audio amplification unit, a pulse width modulation (PWM) unit, a first pre-drive unit, a second pre-drive unit, a first power transistor set, a second power transistor set and a ... | 08/16/2011 |
| 7994853 | Class-D amplifier with dual feedback loop A class-D amplifier with dual feedback loop scheme has a gain adjusting circuit, a second-order integrator, two comparators, a logic circuit and an output driver. Two differential output terminals of the class-D amplifier are connected to two differential amplifiers... | 08/09/2011 |
| 7990211 | Class D amplifier circuit A pulse monitor circuit detects the presence or non-presence of the output pulses output from an output stage circuit. The pulse monitor circuit outputs an up signal to the up/down counter when the output pulses do not exist at all and outputs a down signal to the u... | 08/02/2011 |
| 7965137 | Class-D amplifier A class-D power amplifier according to the present invention includes: a pulse width modulation circuit which modulates an analog signal into low-level and high-level binary signals; and a detection circuit which turns off operation of a circuit connected with a bac... | 06/21/2011 |
| 7965138 | Concept, method and apparatus of improved distortion switched-mode amplifier Systems and methods for switched-mode amplifiers having improved harmonic distortion are disclosed. High order in-band filtering is enabled without undue trade-off of distortion due to intermodulation/aliasing. A pre-modulation block is introduced, deployed between ... | 06/21/2011 |
| 7956681 | Class D amplifier having PWM circuit with look-up table A class D amplifier includes a noise-shaping modulator, a pulse width modulator, and a pulse amplifier. The noise-shaping modulator receive a pulse code modulated (PCM) signal and produces an oversampled PCM signal. The pulse width modulator produce a pulse width mo... | 06/07/2011 |
| 7952426 | Digital audio amplifier and digital audio amplifying method therefor A digital audio signal amplifier and a digital audio signal amplifying method provide safety and power efficiency by integrating a switching mode power supply and a digital audio amplifier into an apparatus. The digital audio amplifier includes a pulse modulation un... | 05/31/2011 |
| 7948308 | Filter compensation for switching amplifiers Embodiments of the present invention provide methods and systems for limiting bipolar current flow in a switching amplifier. Embodiments of the present invention are directed to a multi-referenced switching amplifier. In some embodiment, the switching amplifier is a... | 05/24/2011 |
| 7944289 | Minimum pulse generation in a class-D amplifier For minimum pulse generation in a class-D amplifier, a trapezoid switching waveform shape is used to replace the tradition triangle type to generate PWM pulses. Two voltages are compared with a sawtooth wave signal to generate the trapezoid waveform signal and a con... | 05/17/2011 |
| 7932777 | Switching amplifier for driving reactive loads A switching amplifier drives balanced piezoelectric or other capacitive or reactive loads with a minimum physical electronics volume, enabling a compact arrangement that can combine amplifier and transducer at the same physical location. Power supply current is mini... | 04/26/2011 |
| 7932778 | Power efficient amplifier An amplifier generates a tri-level output signal in response to an input signal that is pulse-width modulated. The amplifier is filterless and DC free. A control block supplies a multitude of pulse-width modulated (PWM) signals in response to the received digital in... | 04/26/2011 |
| 7924089 | Offset voltage correction circuit and class D amplifier A class D amplifier includes an input unit that inputs an input signal and an integrator which includes a differential operational amplifier having an offset voltage correction function. The integrator integrates the input signal input. A pulse-width modulator modul... | 04/12/2011 |
| 7920023 | Switching amplifier A switching amplifier includes a modulator, which includes a pulse generator. The pulse generator generates positive and negative pulses, in response to an input signal, and the frequency of the negative pulses can be controlled independently of the frequency of the... | 04/05/2011 |
| 7911267 | Sigma-delta class-D amplifier and control method for a sigma-delta class-D amplifier A sigma-delta class-D amplifier includes a quantizer to quantize an input to produce a digital signal, and an output stage to produce an output according to the digital signal. The quantizer has a smaller step size so that the digital signal has at least five logica... | 03/22/2011 |
| 7911268 | Apparatus and method for improving the feedback linearity of a 1.5-bit sigma-delta class-D amplifier A conversion circuit is provided for a 1.5-bit Σ-Δ class-D amplifier to improve the feedback linearity of the class-D amplifier, by periodically inverting and mixing a first positive feedback signal and a first negative feedback signal from the power stage of the ... | 03/22/2011 |
| 7888997 | Systems, methods, and apparatuses for linear envelope elimination and restoration transmitters Systems, methods, and apparatuses are provided for linear envelope elimination and restoration transmitters that are based on the polar modulation operating in conjunction with the orthogonal recursive predistortion technique. The polar modulation technique enhances... | 02/15/2011 |
