Quotables
"To place a man in a multi-stage rocket and project him into the controlling gravitational field of the moon where the passengers can make scientific observations, perhaps land alive, and then return to earth--all that constitutes a wild dream worthy of Jules Verne. I am bold enough to say that such a man-made voyage will never occur regardless of all future advances."
Lee deForest, American radio pioneer ; 1957
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| Number | Title | Issue Date |
| 8189816 | Computer controlled amplifier and speaker system with power conservation feature A computer controlled amplifier and speaker system includes a power conservation feature allowing ready adaptation to a variety of consumer vehicles, audio systems, and individual consumer purposes. The computer controlled amplifier and speaker system includes an au... | 05/29/2012 |
| 8184830 | Audio amplifier with simplified electrical isolation A power amplifier that can provide electrical isolation between an input signal and an amplified output signal avoids isolation between the amplifier output and the load to reduce complexity, component count, cost and size over prior power amplifiers. The power ampl... | 05/22/2012 |
| 8175296 | Articulated amplifier An audio amplifier having a variably configurable housing, which may be mounted to an interior surface of a motor vehicle. The housing is formed in two complementing housing sections mutually joined by a hinge, tether, or other connector. A power supply is contained... | 05/08/2012 |
| 8165322 | Circuit for processing sound signals A circuit for processing sound signals includes an input amplifier for amplifying an input signal, wherein the amplified input signal is supplied to an output amplifier unchanged via a primary path configured as a bypass line and processed via one or several seconda... | 04/24/2012 |
| 8155352 | Serializer for multiple applications A serializer/deserializer interfaces a microprocessor/controller with I/O devices over a flexible hinging cable. The I/O devices have parallel interfaces as does the controller but the serializer/deserializer reduces the number of signal that traverse the flexible h... | 04/10/2012 |
| 8155351 | Sound signal output device and program for controlling sound output A sound signal generator includes a sound signal output function for outputting a sound signal to a command-driven amplifier that drives a speaker by using the sound signal being converted according to a control command, a first counter control function for changing... | 04/10/2012 |
| 8150074 | Impedance matching speaker wire system An impedance matched connection is provided between a load and a power source that outputs signals within a predetermined frequency range. A coaxial line has a predetermined characteristic impedance and an inner conductor, an outer conductor, and an insulator the tw... | 04/03/2012 |
| 8139791 | Ground referenced audio headphone amplifier with low standby current A ground-referenced headphone amplifier includes left and right channel audio amplifiers, each including a standby mode trigger control input. A sense comparator circuit samples each audio input signal and, upon the detection of audio signals below a threshold volta... | 03/20/2012 |
| 8139792 | Amplifier circuits, methods of starting and stopping amplifier circuits An amplifier circuit (100) has an input stage (OP1) and an output stage (Q1, Q2) operating with different supply voltages and different quiescent voltages. The output stage has a feedback input connected to receive a feedback signal from ... | 03/20/2012 |
| 8130982 | Signal amplifying apparatus, amplification system, and signal amplification method An amplification system of the invention can decrease power consumption in a power amplification section if the power amplification section need not be used. The power consumption in the power amplification section can be decreased by shutting off power feed into a ... | 03/06/2012 |
| 8130981 | Sound card having feedback calibration loop Disclosed are a sound card and a method for limiting inputs to and outputs from that computer sound card. Specifically, the voltage of a feedback connection between the input and output of a sound card amplifier is increased from minimum voltage until an over-satura... | 03/06/2012 |
| 8111845 | System having a pulse width modulation device A system, a device and a method for pulse width modulation is disclosed. One embodiment includes a pulse width modulation device, a first pulse width modulation mapper for pulse width modulation of a data signal, or a signal derived therefrom, and a second pulse wid... | 02/07/2012 |
| 8094839 | Microelectromechanical system (MEMS) device with senstivity trimming circuit and trimming process A microelectromechanical system (MEMS) device includes a diaphragm capacitor, connected between a capacitor biasing voltage source and a ground. A source follower circuit is coupled to the diaphragm capacitor. An amplifier is coupled to the source follower circuit t... | 01/10/2012 |
| 8085954 | Microphone amplification arrangement and integrated circuit therefor A microphone amplifier arrangement comprises at least one microphone input connected to a dual output microphone pre-amplifier having an input resistance comprising a first resistance and a second resistance in a first voltage-to-voltage mode of operation, and only ... | 12/27/2011 |
| 8073161 | Audio apparatus An audio apparatus includes an input, a first resistor, a first capacitor, an amplifier, a second resistor, a second capacitor, and an output. The input is used for inputting audio signals. The first resistor and the amplifier are serially connected to the input; wh... | 12/06/2011 |
| 8068622 | Method and apparatus for controlling a selectable voltage audio power output stage A method and apparatus for controlling a selectable voltage audio power output stage provides a mechanism for raising the selected power amplifier output voltage in time for the arrival of signal peaks to avoid clipping. Signal peaks may either be delayed by delayin... | 11/29/2011 |
| 8064622 | Self-biased amplifier device for an electrecret microphone A self-biased electrecret microphone amplifier with phantom biasing is using only standard devices implemented in a digital Complementary Metal Oxide Semiconductor (CMOS) process. The stable gain is provided open loop with a self-biased linear transconductance ampli... | 11/22/2011 |
| 8054995 | System, method and apparatus for adjusting an output of a transducer A system and method for modulating the sound pressure that is output from an audio transducer is disclosed. In one embodiment, the method includes receiving an audio signal and placing the audio signal across a voice coil of the transducer. In addition, a voltage is... | 11/08/2011 |
| 8050428 | Audio signal transmission circuit An exemplary audio signal transmission circuit includes a codec to provide analog and digital audio signals; an amplifier connected to the codec to receive the analog audio signals; a control circuit connected to the codec to receive the digital audio signals and co... | 11/01/2011 |
| 8036402 | Distortion compensation A distortion compensation system minimizes distortion in an audio system by monitoring a supply voltage and adjusting a clipping threshold and/or compression knee. An adjustable gain circuit controls the gain of the audio signal according whether the audio signal ex... | 10/11/2011 |
| 8031888 | Electronic apparatus having audio output units Two control voltages are generated, one increasing and another decreasing, in response to the rise of the voltage of a condenser of a common time-constant circuit. Based on the two control voltages, a first and a second currents are formed, from which four different... | 10/04/2011 |
| 8027490 | Audio control method and audio processing system An audio control method and audio processing system utilize an ADC to sample an analog audio input signal and convert it to a digital audio signal. A control module determines input signal level from the digital audio signal. Based on different input signal levels, ... | 09/27/2011 |
| 8014544 | Computer installed stereo PA amplifier card The present invention is a stereo PA amplifier that is mounted inside a desktop computer. It is powered by the computer's 12-volt power supply and receives its input via a stereo mini cable from the computer's audio line out. Standard 8-ohm, non-powered speakers are... | 09/06/2011 |
| 7991172 | Half-voltage headphone driver circuit The present invention discloses a half-voltage headphone driver circuit, comprising: at least one operational amplifier providing an output to a headphone speaker, and a charge pump receiving a supply voltage (VDD), generating a positive half-voltage and a negative ... | 08/02/2011 |
| 7929718 | Systems and methods for switching and mixing signals in a multi-channel amplifier Systems and methods for scaling the number of output channels that can be provided in an audio amplification system. In one embodiment, a digital pulse width modulation (PWM) amplification system includes multiple four-channel PWM controller chips that are interconn... | 04/19/2011 |
| 7889875 | Class-D driving method for stereo load The present invention provides a class D amplifier and method for driving a tri-wired stereo amplifier. Additionally, the class D amplifier includes a first filter, a second filter, a processor, a 2D-quantitizer, a signal generator, and a logic circuit. The class D ... | 02/15/2011 |
| 7826628 | Addressable amplified speaker assembly and method for addressing the same Addressable amplified speakers assembly, and method for addressing the same, suitable for any permanent or temporary public address paging application. Amplified speakers assembly may incorporate VHF and UHF radios to provide wireless, one-way paging from a few feet... | 11/02/2010 |
| 7813515 | Multi-channel power amplifier with channels independently self-configuring to a bridge or single-ended output, particularly for audio applications A multi-channel power amplifier for driving a plurality of loads, each associated with a respective channel, each channel comprising a pair of operational amplifiers, first and second, one operational amplifier of each channel being connectable by configuring switch... | 10/12/2010 |
| 7668321 | Automatic power foldback for audio applications A power foldback circuit to automatically control the power of an audio amplifier by using the volume inputs to a pre-amp source which drives the audio amplifier. In an embodiment, a Universal Serial Bus (USB) on a personal computer is used to drive the audio speake... | 02/23/2010 |
| 7657041 | Laser audio preamplifier, volume control, and multiplexer A fiber optical audio preamplifier receives audio signals from an audio source, amplifies the audio signals, and transfers the signals to a power amplifier. The fiber optical audio preamplifier has at least one first signal converter. Each first signal converter acq... | 02/02/2010 |
| 7643642 | Method and system for operating accessory controls The invention concerns an accessory (112) for coupling to a portable electronic device (110). The accessory includes an interface (120) for coupling to the portable electronic device, an identifier (124) in which the identifier generates ... | 01/05/2010 |
| 7636446 | State machine enabling auto-recovery of short-circuited class D audio amplifiers Methods and apparatus for enabling auto-recovery of a digital audio amplifier after a short-circuit are disclosed. In accordance with one embodiment, a short-circuit is detected by both detecting a switching signal at an output of the digital audio amplifier and sen... | 12/22/2009 |
| 7623669 | Simplified amplifier providing sharing of music with enhanced spatial presence through multiple headphone jacks A personal listening device used in connection with the amplification of signals for enhancing the perceived quality and ambiance of sound heard by listener using stereo headphones or small speaker systems utilizes a difference signal that is cross-fed between stere... | 11/24/2009 |
| 7602927 | Guitar amplifier with channel-dedicated power switching An amplifier for electric guitar including a plurality of foot switch selectable preamplifier channels which can be set to provide differing sonic characteristics, and also including a power amplifier section for driving a loudspeaker that can be switched between at... | 10/13/2009 |
| 7564982 | Two channel audio surround sound circuit A two channel surround sound audio circuit (surround sound circuit) includes a first amplifier, a second amplifier, two polarized input capacitors, and two polarized output capacitors. A first input line is coupled through one polarized input capacitor to a positive... | 07/21/2009 |
| 7474757 | Circuit and method for providing an auto-off and/or auto-on capability for an audio device A circuit (FIGS. 2A-2D) and method of providing an auto-on and/or auto-off capability for an audio device, of a type having an audio plug (14) which mates with the output jack of an audio source. The portable transmitter (10) modulates au... | 01/06/2009 |
| 7433477 | Audio superpositioning A circuit, which is enabling the superpositioning of different audio signals such as voice, music or ringer signals in a audio output device is achieved. The individual superpositioning can be activated and performed by a combination of resistors and switches withou... | 10/07/2008 |
| 7428311 | Method and apparatus for boosting an audible signal in a notification system The present invention is an apparatus and a concomitant method for boosting the audio signal generated by at least one notification appliance in a supervised emergency voice evacuation system. ... | 09/23/2008 |
| 7412064 | Presence control for guitar amplifier A guitar amplifier having at least one channel, each channel having a differential amplifier with first and second amplifying members, each amplifying member having a control element, an electron emitting element and an electron collecting element, the electron emit... | 08/12/2008 |
| 7388959 | Harmonic generator and pre-amp A Harmonic Generator for audio applications and a Pre-Amplifier circuit are combined to form a Harmonic Generator and Pre-Amplifier circuit. The Harmonic Generator is formed from a Buffer Circuit responsive to an input program signal for buffering the input program ... | 06/17/2008 |
