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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...
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7584009 |
Multi-chip PWM synchronization and communication
Systems and methods for synchronizing multiple digital audio controller chips, wherein one of the chips is designated as a master and the other chips are designated as slaves. A common line...
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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...
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7564304 |
Audio power amplifier apparatus
The invention concerns an audio power amplifier apparatus capable of providing at low manufacturing cost extremely low non-linear distortion, even lower than −120 dB, comprising a main power...
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7548630 |
Integrated loudspeaker system
A loudspeaker system including a plurality of sonic converters fixed in or to the rear of sound passage openings of a carrier plate is disclosed. The carrier plate is configured in the form of a...
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7522735 |
Electronic circuit with spring reverberation effect and improved output controllability
An electronic circuit for adding the effects of reverberation to a high impedance signal produced from an external audio source such as a guitar pickup or a high impedance microphone. The...
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7505600 |
Processor control of an audio transducer
A controller, either a microprocessor or finite state machine, is used to generate a pulse train whose frequency and duty cycle can be varied to alter the frequency and amplitude of the output of a...
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7477752 |
Loudspeaker system
A loudspeaker system with three loudspeakers (LF, LR, LB), includes a first and a second amplifier (BF, BR), each of which amplifies a channel of an audio signal. The outputs of the amplifiers...
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7474757 |
Circuit and method for providing an auto-off and/or auto-on capability for an audio device
A circuit (FIGS. 2 A- 2 D) 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...
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7472289 |
Audio noise mitigation for power state transitions
An audio noise mitigation approach. For one aspect, a first voltage associated with a first power management state is provided. A signal responsive to an indication associated with at least a first...
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7472048 |
Direct digital drive audio system and method
A direct digital drive audio system and method system and method are presented. The direct digital drive system and method utilizes a digital signal to directly drive the speakers. In one exemplary...
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7459978 |
Ground skimming output stage
Ground skimming output stages that are designed to drive wideband signals with the ability to provide a high quality output signal all the way to the low supply rail are provided. In accordance...
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7459968 |
Audio power amplifier IC and audio system provided with the same
An audio power amplifier IC which is capable of suppressing degradation in sound quality resulting from the frequency of a reference clock, and an audio system provided with the audio power...
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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...
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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.
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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...
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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...
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7362871 |
Audio amplifier circuit and audio IC having the same
In the present invention, in parallel with a resistor which determines an amplification rate being fed back from an output to an input of an output stage OP amp in an audio amplifier circuit,...
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7340272 |
Mobile communication terminal having a three-dimensional surround sound effect and its control method
A mobile communication terminal with three-dimensional surround-sound effect system has a data processing section for coding and modulating a transmitting signal or demodulating and decoding a...
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7321661 |
Current feedback system for improving crossover frequency response
A loudspeaker is provided for receiving an incoming electrical signal and transmitting an acoustical signal. The loudspeaker may include a power amplifier that has an input and an output, where the...
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7302063 |
Audio system for an automobile
An audio system for a motor vehicle includes a plurality of speaker units to which audio signals from various audio signal sources are supplied. The supply between at least one audio signal source...
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7254244 |
Pop and click reduction using DAC power up and power down processing
An audio amplifier generates an output to a load, in which a digital-to-analog converter drives the amplifier during powering up and powering down the amplifier. The digital-to-analog converter...
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7221766 |
Microphone input buffer biasing circuit
An input biasing circuit for a microphone is disclosed. The circuit includes an input and an output. An input transistor is connected between the input and the output and to a biasing circuit. The...
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7215788 |
Digital loudspeaker
A digital pulse-width-modulation (PWM) generator comprising: an n bit digital magnitude comparator having first and second n bit inputs and an output indicative of the relative values of the...
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7194097 |
Audio control device
An Audio Codec which comprises a power selecting circuit an audio compiler circuit and a control amplifier circuit. The power selecting circuit receives at least a primary power source and an...
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7184561 |
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...
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7171011 |
Acoustic drive circuit
An acoustic drive circuit for driving a headphone for converting variation of magnetic force, occurring to a voice coil, in sound, and outputting the sound, includes a power amplifier for...
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7158843 |
Modular software definable pre-amplifier
Pre-amplifier apparatus, for use for example in a home hi-fi system, compoosed of one or a plurality of reconfigurable circuits used to configure the apparatus to implement the desired audio...
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7158646 |
Signal derived bias supply for electrostatic loudspeakers
An electrostatic loudspeaker requires a high voltage DC bias power supply to bias the stators and diaphragms of electrostatic speakers. A self biased power supply eliminates the need for an...
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7155020 |
Audio circuitry for dynamics reduction
A circuit for processing an audio signal includes an input stage to which the audio signal is applied and an output at which the processed audio signal is presented. The circuit comprises first and...
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7149317 |
CMOS high impedance circuit
A high impedance circuit includes a diode-connected MOSFET circuit. This circuit may be used in a buffer amplifier of a hearing aid microphone, coupled across an input of the buffer amplifier and...
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7149316 |
Microcontroller having an on-chip high gain amplifier
A microcontroller includes a wide band, high gain amplifier on-chip capable of driving a 32 ohm speaker. The amplifier is controllable by the microcontroller processor to either enable or disable...
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7146194 |
Amplifying circuit, speaker system, and mobile information terminal employing amplifying circuit
An amplifying circuit includes a battery power source, a regulator that regulates an output of the battery power source and generates a reference voltage, and a signal ground generating device that...
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7146015 |
Frequency threshold audio activity detector
This invention is a circuit that actuates a loudspeaker at input frequencies above a predetermined threshold and mutes the loudspeaker at input frequencies below the threshold. The circuit includes...
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7123730 |
Audio power amplifying apparatus and method
An audio power amplifying apparatus includes first through B-th power amplifying terminals, each of which power-amplifies an input alternating current (AC) audio input signal input and outputs the...
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7123729 |
Dual use of an integrated circuit pin and the switching of signals at said pin
In a signal processing system with an IC having an intrinsic signal provided at a pin of the IC, a first operational function (de-emphasis) for the signal is provided at the pin, and further along...
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7110560 |
Electret condensor microphone preamplifier that is insensitive to leakage currents at the input
A preamplifier having extremely high input impedance amplifies the electrical signal output from an electret condenser microphone (ECM) without suffering from the effects of a DC leakage current at...
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7106135 |
Amplifier system and method
An amplifier system comprises an amplifier, a comparator connectable to the amplifier to compare an incoming signal with a number of reference potentials. A switching stage is controlled by the...
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7103189 |
Power supply noise immunity for audio amplifier
An audio amplifier configuration for a personal computer system optimizes performance in both the single-ended mode and the bridged mode. In a single-ended mode, as when the computer system user...
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7099481 |
Method and system for automatically detecting and powering PC speakers
A method of powering an audio output device of a computer system, by determining whether a passive or active audio output device is connected to an audio output jack of the computer system and,...
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7095862 |
Headphone amplifier
A compact portable stereo headphone amplifier system for use with a conventional stereo audio source, such as a cassette or compact disc player, in which components are located on both sides of a...
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7092534 |
Method and system for reducing pop noise of a sound broadcasting instrument
A method and system are disclosed for controlling pop noises in a sound broadcasting system. After controllably connecting an output of a drive amplifier to a first predetermined low voltage level...
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7092533 |
BTL amplifier apparatus
A BTL amplifying apparatus has two power amplifiers in an BTL configuration for amplifying a speaker. It includes detection means for detecting a differential voltage between outputs from the two...
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7092530 |
Motor vehicle audio system
A motor vehicle audio system having an audio signal receiver, an amplifier connected thereto via a fiber optic cable and a loudspeaker. A separate amplifier is provided for low audio signals. The...
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7085389 |
Infinite slope loudspeaker crossover filter
An improvement to inventor's prior art loudspeaker crossover filter invention is described. A substantially flat network input-impedance characteristic across the audible frequency range is...
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7076070 |
Monolithic class D amplifier
A monolithic 1.75 is mounted in a speaker cabinet 1.71 to drive the voice coil 1.74 of the speaker 1.70. The monolithic integrated circuit may be a class D amplifier 1.10, and is at least...
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7072478 |
Microphone preamplifier
A microphone preamplifier. An electrical signal from a microphone is received via a shielded cable by an input stage cascaded with an output stage. The input stage contains an impedance converter...
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7062336 |
Time-division method for playing multi-channel voice signals
A time-division method for playing multi-channel voice signals is provided to improve voice qualities of the multi-channel voice signals. The first feature of the present invention is that after...
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7046814 |
Impedance adapter preamplifier device for electronic tube audio frequencies able to be inserted on line on the path of the low frequency signal
The invention concerns an online low frequency amplifying interface operating in automatic cutting feed, particularly designed for multimedia computers. It concerns a impedance adapting device...
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7043033 |
Mode control for audio amplifier coupling
An audio amplifier system includes two amplifiers that are configured to drive loads through either DC or AC coupling. A third amplifier provides an AC ground return when the system is configured...
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