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9042578 Microphone amplifier with overload circuit  
A microphone amplifier comprises a microphone terminal for connecting a microphone, particularly a MEMS microphone, and an amplifier circuit with an amplifier input that is connected to the...
9036836 Amplifier apparatus  
Disclosed is a technique for reducing noise superimposed on an output signal while keeping loop gain constant without increasing the circuit scale and without changing the transfer function of the...
9036835 Combining an audio power amplifier and a power converter in a single device  
An apparatus is described that includes an audio power amplifier having an input and an output. An alternating-current to direct-current power converter is coupled to the audio power amplifier in...
9025793 Audio signal processing circuit  
A selector selects an analog audio signal input to one input port from among analog audio signals input to multiple input ports according to an instruction from the user. An analog gain control...
9014396 System and method of reducing click and pop noise in audio playback devices  
An audio system that reduces or eliminates click and pop noise during power up and power down operations. In particular, the audio system includes an amplifier with an input adapted to receive an...
9008322 Efficiency optimizer of an audio power amplifier for car radio  
The present invention concerns an audio amplifier circuit designed to provide an output signal to an audio transducer, said audio amplifier circuit comprising an audio power amplifier designed to...
9008333 Guitar amplifier  
A device and methods are provided for a guitar amplifier. In one embodiment, an amplifier includes an overdrive shaping circuit including one or more elements for harmonic shaping of a received...
9008319 Sound pressure level limiter with anti-startle feature  
Sound pressure level limiter with anti-startle feature for audio systems are disclosed. The anti-startle feature may be implemented with a delta incident detector for detecting delta acoustic...
9008332 Processing chip for a digital microphone and related input circuit and a digital microphone  
A processing chip for a digital microphone and related input circuit and a digital microphone are described herein. In one aspect, the input circuit for a processing chip of a digital microphone...
9008334 Audio mixing console  
An audio mixing console comprises a first amplifier, an analogue to digital converter, a second amplifier and a gain range control unit. The first amplifier may receive an analogue audio input...
9000900 Vehicle proximity annunciator device  
A vehicle proximity annunciator device reduces an occurrence of a pop noise without an additional circuit changing an output of a power amplifier. A capacitor is located between a connection point...
8995691 Audio amplifier  
The embodiments described herein relate to amplifier circuits with power rails. The power rails are generated in response to an input signal, which will typically be an audio signal, and with a...
8989406 User profile based audio adjustment techniques  
Embodiments are directed toward user profile based audio adjustment techniques. The techniques are used to render various audio and/or audio/video content having different audio output parameter...
8989407 Audio control method and audio control apparatus  
A channel conversion part (214) performs channel conversion on audio data of a plurality of channels so that the number of channels thereof is converted to an appropriate number of channels for...
8983086 Audio output controller and control method  
An output controller and an method for outputting a signal flow to one or more earphone jacks according to a connection status of each earphone jack. The output controller includes an interface...
8983094 All-in-one computer audio system  
An all-in-one audio system includes an audio chip, an audio interface, first and second audio signal amplifiers, a speaker, a woofer, a multi-function controller, a high definition multimedia...
8965010 Multi-stage amplifiers to reduce pop noise  
An amplifier (50) for voice or audio signals, and particularly for headset applications, uses a low gm amplifier (54) for initially charging an output node (OUT) at the beginning of a power-on...
8965011 Automatic gain control circuit and method for automatic gain control  
A method of attenuating an input signal to obtain an output signal is described. The method comprises receiving the input signal, attenuating the input signal with a gain factor to obtain the...
8963634 Load current sensing  
Techniques for sensing current delivered to a load by a differential output stage, e.g., in a Class D amplifier. In one aspect, voltages across sense resistors coupled in series with first and...
8965774 Automatic detection of audio compression parameters  
For a media clip that includes audio content, a novel method for performing dynamic range compression of the audio content is presented. The method performs an analysis of the audio content. Based...
8958575 Amplifier with configurable DC-coupled or AC-coupled output  
A multi-mode amplifier with configurable DC-coupled or AC-coupled output is described. In one design, the multi-mode amplifier includes an amplifier and at least one DC level shifting circuit. The...
8958576 Dynamically biased amplifier  
An amplifier including an input stage, an output stage, an adjustable bias current generator and a level detector. The input stage may receive and amplify or buffer an input signal. The input...
8958577 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...
8953826 System, method and apparatus for television speaker configuration  
An application for present invention includes a television with a set of speaker outputs including at least a left speaker and a right speaker. On screen displays are used to properly configure...
8954177 Controlling operation of a media device based upon whether a presentation device is currently being worn by a user  
A mechanism is provided for automatically controlling the operation of a media device based at least in part upon whether a portable presentation device coupled to the media device is currently...
8942391 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...
8934634 Stereo signal processing circuit  
A noise level of an output signal is maintained low. An adjacent interference detecting unit compares a signal level of a wide band signal which is a desired station signal of a relatively wide...
8934647 Orientation-responsive acoustic driver selection  
An audio device incorporates a first acoustic driver having a first direction of maximum acoustic radiation and a second acoustic driver having a second direction of maximum acoustic radiation,...
8908886 Power amplifying apparatus and audio system  
The power amplifying apparatus includes a first comparator that compares the first detection signal and the fourth detection signal and outputs a first comparison signal depending on whether or...
8908887 Multi-channel class-D audio amplifier with planar inductors  
An apparatus for providing an audio signal to drive a speaker system includes first and second audio channels. The first audio channel has a first class-D amplifier for receiving an input signal,...
8908890 Circuit arrangement for adjusting the output power and/or the frequency response of a power amplifier for a hearing aid device  
With a hearing aid device, the problem arises of having to match the output power and/or the frequency response of the hearing aid device to the level of hearing impairment of the patient as...
8903099 End of branch module system  
An end-of-branch (EOB) module system for an audio signal distribution system having a wired trunk and a plurality of wired branches extending communicatively from such trunk, the EOB module system...
8897468 Noise control circuit and audio receiving system using the same  
A noise control circuit includes a filter, a rectifier and a switch. The filter receives audio signals and obtains a noise signal portion of the received audio signals. The rectifier converts the...
8897460 Microphone amplifier  
A microphone amplifier comprises an input terminal (E100) for applying an input signal (IN), an output terminal (A100a) for outputting an output signal (OUT), and an additional output terminal...
8896377 Apparatus for common mode suppression  
An apparatus is provided that includes first and second ICs configured to communicate using a plurality of differential signal lines. The apparatus includes a common mode suppression circuit...
8897467 Capacitive load driving amplifier  
An electronic amplifier for driving a capacitive load may include first and second differential input terminals to receive an input signal, and first and second differential output terminals to...
8890608 Digital input class-D audio amplifier  
An audio amplifier receiving a digital input audio signal and generating an output audio signal for driving a speaker includes a digital input class D amplifier configured to receive the digital...
8879754 Sound reproducing system with superimposed digital signal  
A home use sound reproduction system for Hi-fi, with digital signal transfer from a playback unit via a control unit to one or more active loudspeakers, each including or arranged beside an...
8867761 Multi-tier power supply for audio amplifiers  
Techniques for providing multiple power supplies in electronic devices are disclosed. According to one aspect of the present invention, an appropriate power supply is provided only to accommodate...
8861751 Audio processing apparatus  
In an audio processing apparatus of the present invention, one or two audio signals selected from a surround rear left audio signal, a left outer audio signal and a left upper audio signal is...
8861748 Amplifier and amplifier control method  
Disclosed is a class D amplifier comprising a modulation stage having a first input for receiving an input signal and an output for producing a modulated version of the input signal; a plurality...
8861749 Audio output driver for reducing electromagnetic interference and improving audio channel performance  
An audio output circuit includes an on-chip left channel amplifier module, an on-chip center channel amplifier module, and an on-chip right channel amplifier module. A left channel IC pin is...
8861775 Stereo system and speakers for a watercraft  
A speaker and stereo system for a watercraft are disclosed. The stereo system includes an amplifier sized and adapted to fit within an internal compartment of the watercraft, and having a power...
8855335 Distortion suppression in high-level capable audio amplification circuit  
The present invention relates to an audio amplification circuit comprising a first preamplifier for receipt of an audio input signal and a second preamplifier comprising a first differential input...
8855322 Loudness maximization with constrained loudspeaker excursion  
An original loudness level of an audio signal is maintained for a mobile device while maintaining sound quality as good as possible and protecting the loudspeaker used in the mobile device. The...
8855187 Signal processing method for enhancing a dynamic range of a signal  
A signal processing method for enhancing the dynamic range of a signal is disclosed. The method comprises: a) forming an attenuated signal from an input signal;b) filtering each of the input and...
8848945 Audio amplifier with closed-loop power  
The present technology relates generally to a closed-loop power stage and audio amplifier circuits comprising the same. The present technology further provides a method for controlling an...
8848944 Low powered guitar amplifer with or without attenuator  
A low powered guitar amplifier is disclosed that can generate the overdriven tones of much larger class ab push-pull amplifiers and attenuate them further with an attenuator that leaves the tone...
8848947 Low-noise microphone pre-amplifier with active load element  
A low-noise pre-amplifier with an active load element is integrated into a microphone. The microphone has an acoustic sensor coupled to the intrinsic pre-amplifier. A controllable current source...
8842855 Sound volume control circuit  
A sound volume control circuit includes: a first operational amplifier; a variable resistor circuit connected between an output and an inverting input of the first operational amplifier and having...