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801results about "Transducer protection circuits" patented technology
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System for limiting loudspeaker displacement
InactiveUS20050207584A1Control displacementElectrophonic musical instrumentsTransducer circuit dampingEngineeringLoudspeaker
Loudspeakers can be damaged by high drive signals. One reason for this damage is an excess vibration displacement of the coil-diaphragm assembly. This invention describes a novel method for limiting this displacement by a signal processor. In the present invention, a low frequency shelving and notch filter is used to attenuate low frequencies according to a prediction of the loudspeaker displacement. A novel method for calculating coefficient values for a digital implementation of the low frequency shelving and notch filter according to the predicted displacement is described.
Owner:NOKIA TECHNOLOGLES OY
Capacitive position sensing for transducers
ActiveUS20160094917A1Avoid speaker damageReduce and eliminate non-axial rocking motionTransducer protection circuitsDiaphragm mounting/tensioningEngineeringLoudspeaker
A micro speaker having a capacitive sensor to sense a motion of a speaker diaphragm, is disclosed. More particularly, embodiments of the micro speaker include a conductive surface of a diaphragm facing conductive surfaces of several capacitive plate sections across a gap. The diaphragm may be configured to emit sound forward away from a magnet of the micro speaker, and the capacitive plate sections may be supported on the magnet behind the diaphragm. In an embodiment, the gap provides an available travel for the diaphragm, which may be only a few millimeters. A sensing circuit may sense capacitances of the conductive surfaces to limit displacement of the diaphragm to within the available travel.
Owner:APPLE INC
Arrangement and method for converting an input signal into an output signal and for generating a predefined transfer behavior between said input signal and said output signal
ActiveUS20150036831A1Cost effectiveLow hardware requirementsTransducer protection circuitsLimiting amplitudeRest positionMagnetic transducers
An arrangement and method for converting an input signal z(t) into a mechanical or acoustical output signal p(t) comprising an electro-magnetic transducer using a coil at a fixed position and a moving armature, a sensor, a parameter measurement device and a controller. The parameter measurement device identifies parameter information P of an nonlinear model of the transducer considering and the saturation and the geometry of the magnetic elements. A diagnostic system reveals the physical causes of signal distortion and generates information for optimizing the design and manufacturing process of this transducer. The controller compensates for nonlinear signal distortion, stabilizes the rest position of the armature and protects the transducer against mechanical and thermal overload.
Owner:KLIPPEL WOLFGANG
Method and arrangement for controlling an electro-acoustical transducer
ActiveUS20150319529A1Sufficient amplitudeSufficient sound qualityTransducer protection circuitsTransducer acoustic reaction preventionAudio power amplifierTransducer
An arrangement and method for converting an input signal into a mechanical or acoustical output signal by using a transducer and additional means for generating a desired transfer behavior and for protecting said transducer against overload. Transducers of this kind are for example loudspeaker, headphones and other mechanical or acoustical actuators. The additional means comprise a controller, a power amplifier and a detector. The detector identifies parameters of the transducer model if the stimulus provides sufficient excitation of the transducer. The detector permanently identifies time variant properties of the transducer for any stimulus supplied to the transducer. The controller provided with this information generates a desired linear or nonlinear transfer behavior; in particular electric control linearizes, stabilizes and protects the transducer against electric, thermal and mechanical overload at high amplitudes of the input signal.
Owner:KLIPPEL WOLFGANG
Method of controlling diaphragm excursion of electrodynamic loudspeakers
ActiveUS9813812B2Reliable and convenient protectionSignal processingCombination control in untuned amplifierBand splittingLow frequency band
The present application relates in one aspect to a method of controlling diaphragm excursion of an electrodynamic loudspeaker. The method comprises dividing the audio input signal into at least a low-frequency band signal and a high-frequency band signal by a band-splitting network and applying the low-frequency band signal to a diaphragm excursion estimator. The instantaneous diaphragm excursion is determined based on the low-frequency band signal. The determined instantaneous diaphragm excursion is compared with an excursion limit criterion. The low-frequency band signal is limited based on a result of the comparison between the instantaneous diaphragm excursion and the excursion limit criterion to produce a limited low-frequency band signal which is combined with the high-frequency band signal to produce an excursion limited audio signal.
Owner:ANALOG DEVICES INT UNLTD
Audio power management system
ActiveUS20110228945A1Improve system performanceImprove performanceTransducer circuit dampingTransducer protection circuitsSystems managementEngineering
An audio power management system manages operation of audio devices in an audio system. The audio power management system includes a parameter computer, a threshold comparator and a limiter. Audio signals generated with the audio system may be provided to the audio power management system. Based on a measured actual parameter of the audio signal, such as a real-time actual voltage and / or a real-time actual current, the parameter computer can derive estimated operational characteristics of audio devices, such as a loudspeaker included in the audio system. The threshold comparator may use the estimated operational characteristics to develop a threshold and manage operation of one of more devices in the audio system by monitoring the measured actual parameter, and selectively directing the limiter to adjust the audio signal, or another device in the audio system to protect or optimize performance.
Owner:HARMAN INT IND INC
Detection and control of diaphragm collapse in condenser microphones
ActiveUS7548626B2Increase freedomMaximum flexibilityElectrostatic transducer microphonesTransducer protection circuitsTransducerEngineering
A condenser microphone is provided having a transducer element. A diaphragm has an electrically conductive portion. A back-plate has an electrically conductive portion. A DC bias voltage element is operatively coupled to the diaphragm and the back-plate. A collapse detection element is adapted to determine a physical parameter value related to a separation between the diaphragm and the back-plate. A collapse control element is adapted to control the DC bias voltage element based on the determined physical parameter value.
Owner:TDK CORPARATION
Noise reduction apparatus and audio reproduction apparatus
InactiveUS20130243225A1Sufficient noise reduction effectAvoid howlingVehicle seatsHearing device active noise cancellationEngineeringNoise reduction
A noise reduction apparatus includes: a speaker with a speaker unit held by holding means to make it possible to mix sounds emitted from front and rear of a vibration plate of the speaker; a microphone provided in an area where the sounds emitted from the front and rear of the vibration plate of the speaker are mixed and cancelled; and means for supplying a noise reduction audio signal obtained by phase-inverting an audio signal collected by the microphone to the speaker.
Owner:SONY GRP CORP
Communicating road noise control system, in-vehicle road noise controller, and server
InactiveUS20080188271A1Enhance phonetic recognition rateEar treatmentSpeech analysisFrequency spectrumControl system
Road noise is reduced without locally storing noise spectrum patterns for determination or without detecting the present position of a vehicle from the device. An in-vehicle hands-free device causes a cellular phone to detect the present position of the vehicle and transmit the position to a server. The server determines a noise spectrum pattern corresponding to the road surface on which the vehicle is presently running. The noise spectrum pattern is based on the present position of the vehicle received from the in-vehicle hands-free device and road information. The server transmits the noise spectrum pattern to the in-vehicle hands-free device whereupon a noise canceling signal is superimposed on a received signal. The noise canceling signal is based on an inverted noise spectrum pattern that is obtained by inverting the phase of the noise spectrum pattern. The resulting composite signal is output from a speaker.
Owner:DENSO CORP
Environmental noise reduction and cancellation for a communication device including for a wireless and cellular telephone
InactiveUS7742790B2Easy to hearReduce noiseInterconnection arrangementsSubstation equipmentDigital signal processingEnvironmental noise
Various embodiments of the present invention enable a system and method for reducing or entirely canceling background or environmental noise from a voice transmission from a communications device. A communications device, such as a mobile telephone, is configured with an environmental noise compensation, correction, or counterbalanced (correction) signal generator that is connected between at least one microphone and a continuous time quadrant multiplication. Optional discrete time or digital signal processing may be applied. The original output of the at least one microphone and a compensation, correction, or counterbalanced or counter-balancing signal generated by the environmental noise compensation, correction, or counterbalanced signal generator are mixed or otherwise combined together after being received by the antenna to the receiver.
Owner:NOISE FREE WIRELESS
Detection and control of diaphragm collapse in condenser microphones
ActiveUS20060008097A1Increase freedomMaximum flexibilityElectrostatic transducer microphonesTransducer protection circuitsTransducerEngineering
A condenser microphone is provided having a transducer element. A diaphragm has an electrically conductive portion. A back-plate has an electrically conductive portion. A DC bias voltage element is operatively coupled to the diaphragm and the back-plate. A collapse detection element is adapted to determine a physical parameter value related to a separation between the diaphragm and the back-plate. A collapse control element is adapted to control the DC bias voltage element based on the determined physical parameter value.
Owner:TDK CORPARATION
Low-frequency range extension and protection system for loudspeakers
ActiveUS20080175397A1Expand low frequency bandwidthRegulation stabilityTransducer protection circuitsFrequency response correctionElectricityPassive radiator
Low-frequency bandwidth extension in the form of dynamic electrical equalization may be applied to loudspeakers so long as the excursion capability of their drive units as well as velocity limits of any port(s) or excursion limits of any associated passive radiator(s), and the power limits of the drive units are not exceeded. The bandwidth extension maximizes low-frequency bandwidth dynamically such that excursion is fully utilized over a range of drive levels, without exceeding the excursion limit. Additional limiting control is available for port air velocity or passive radiator excursion, and loudspeaker drive unit electrical power. The system applies to open back, closed box, vented box, and more complex box constructions consisting of combinations of these elements for loudspeaker designs using design parameters appropriate to each system.
Owner:AUDYSSEY LABORATORIES
Ear Coupling Status Sensor
A system and method configured to determine if a user is appropriately wearing an audio device, such as a headset, is described that enables a more accurate calculation of the audio device's acoustical characteristics. Headsets, such as headphones and earbuds, include a plurality of engagement sensors configured to determine if the audio device is engaged with the user's body. Engagement sensors may comprise capacitive sensors configured to communicate their state to an engagement sensor processing circuit, which may be located in a digital signal processor. If the engagement sensor processing circuit determines that the audio device is properly engaged with the user's body, then the circuit sends a signal that engages the calculation of various audio device acoustical quality calculations that among other things may satisfy various regulatory requirements and may also lead to an improved user experience.
Owner:PLANTRONICS
Transducer displacement protection
ActiveUS20090268918A1Transducer protection circuitsDigital/coded signal combination controlTransducerEngineering
This invention relates to the mechanical protection using digital processing and a predictive estimation of instantaneous displacement of the voice coil in a loudspeaker transducer.The invention solves the problem of limiting the coil displacement of the transducer by applying a look-a-head based linear or non-linear predictor and a controller operating directly on the displacement signal in order to finally convert back into the incoming signal domain.
Owner:BANG & OLUFSEN ICEPOWER
System for limiting loudspeaker displacement
Loudspeakers can be damaged by high drive signals. One reason for this damage is an excess vibration displacement of the coil-diaphragm assembly. This invention describes a novel method for limiting this displacement by a signal processor. In the present invention, a low frequency shelving and notch filter is used to attenuate low frequencies according to a prediction of the loudspeaker displacement. A novel method for calculating coefficient values for a digital implementation of the low frequency shelving and notch filter according to the predicted displacement is described.
Owner:NOKIA TECH OY
Systems and methods for transducer calibration and tuning
ActiveUS20110002471A1Headphones for stereophonic communicationDigital data processing detailsHard disc driveEarcon
Audio transducers (headphones, speakers, microphones) inherently do not accurately reproduce the signal presented to them at the input. This can be compensated for by taking into account the transducer characteristics and transforming the input signal using a digital signal processor (DSP) to counteract the inaccuracies. However, for the compensation to take place, the DSP needs to know the characteristics of the transducer. For systems with built-in transducers (like laptops with internal speakers) the characteristics of the internal speakers can be stored on the hard-drive of the laptop and the DSP can read this data and make the appropriate compensations. Because a transducer (headphone, speaker, microphone) has its own characteristics that need to be compensated for separately, a profile is supplied to the DSP either by a database lookup based on an identification made by the user or transducer itself or by profile information stored on the transducer. Once the characteristics of a transducer are known, many additional DSP algorithms can be applied in order to improve the audio performance and even safety of the system.
Owner:SYNAPTICS INC
Communication system with adaptive noise suppression
InactiveUS7209567B1Reduce noiseTransducer protection circuitsSpeech recognitionCommunications systemFrequency spectrum
A signal-to-noise ratio dependent adaptive spectral subtraction process eliminates noise from noise-corrupted speech signals. The process first pre-emphasizes the frequency components of the input sound signal which contain the consonant information in human speech. Next, a signal-to-noise ratio is determined and a spectral subtraction proportion adjusted appropriately. After spectral subtraction, low amplitude signals can be squelched. A single microphone is used to obtain both the noise-corrupted speech and the average noise estimate. This is done by determining if the frame of data being sampled is a voiced or unvoiced frame. During unvoiced frames an estimate of the noise is obtained. A running average of the noise is used to approximate the expected value of the noise. Spectral subtraction may be performed on a composite noise-corrupted signal, or upon individual sub-bands of the noise-corrupted signal. Pre-averaging of the input signal's magnitude spectrum over multiple time frames may be performed to reduce musical noise.
Owner:PURDUE RES FOUND INC
Systems and methods for transducer calibration and tuning
Owner:SYNAPTICS INC
Communicating road noise control system, in-vehicle road noise controller, and server
Road noise is reduced without locally storing noise spectrum patterns for determination or without detecting the present position of a vehicle from the device. An in-vehicle hands-free device causes a cellular phone to detect the present position of the vehicle and transmit the position to a server. The server determines a noise spectrum pattern corresponding to the road surface on which the vehicle is presently running. The noise spectrum pattern is based on the present position of the vehicle received from the in-vehicle hands-free device and road information. The server transmits the noise spectrum pattern to the in-vehicle hands-free device whereupon a noise canceling signal is superimposed on a received signal. The noise canceling signal is based on an inverted noise spectrum pattern that is obtained by inverting the phase of the noise spectrum pattern. The resulting composite signal is output from a speaker.
Owner:DENSO CORP
Audio driver system and method
A system and apparatus for constructing a displacement model across a frequency range for a loudspeaker is disclosed. The resultant displacement model is centered around the distortion point. Once a distortion model is constructed it can be incorporated into an audio driver to prevent distortion by incorporating the model and a distortion compensation unit with a conventional audio driver. Various topologies can be used to incorporate a distortion model and distortion compensation unit into an audio driver. Furthermore, a wide variety of distortion compensation techniques can be employed to avoid distortion in such an audio driver.
Owner:SYNAPTICS INC
Frequency dependent excursion limiter
ActiveUS6931135B1Lower potentialReduce in quantityTransducer protection circuitsTransducer casings/cabinets/supportsTransducerMechanical overload
A circuit and method provides for the protection of transducers from over excursion, particularly for the protection of transducers for audio loudspeakers. A frequency dependent excursion limiter circuit has an initial summing stage followed by a shaping filter stage. A clamping function is provided at the summing stage, or at a separate stage between the summing stage and the shaping filter stage, for clamping the driving signal at a predetermined maximum voltage if the driving signal exceeds the predetermined maximum voltage level. The shaping filter stage provides a frequency response shaping function based on a predetermined frequency response shaping criteria which is related to the frequency dependent excursion limits of the transducers being protected from mechanical overload. An inverse shaping filter function is provided at the initial summing stage by providing feedback from the shaping filter stage, thus eliminating the need for a separate inverse shaping filter circuit before clamping. The inverse shaping filter function allows low level signals below clamping to pass through the circuit unaffected.A frequency dependent excursion limiter circuit is also provided in the closed loop circuit of servo feedback system for protecting transducers in a servo feedback system from over excursion.
Owner:MEYER SOUND LABORATORIES
Sound producing system and audio amplifying method thereof
ActiveUS20150010168A1Increase the loudnessImprove sound qualityGain controlTransducer circuit dampingEngineeringLoudspeaker
The invention provides one sound producing system including a speaker, a driving circuit and an audio controller. The speaker is used for producing an audible sound. The driving circuit is connected to the speaker. The audio controller is configured to receive an input audio signal and pre-amplify the input audio signal with an amplify gain to obtain a pre-amplified audio signal; operate a multiband dynamic range control on the pre-amplified audio signal to obtain an output audio signal; convert the output audio signal to a driving voltage; provide the driving voltage to the speaker through the driving circuit; detect over the driving circuit to obtain at least one excursion parameter to determine an estimated excursion of the speaker in response to the driving voltage; and adjust the amplify gain according to the estimated excursion.
Owner:HTC CORP
Method of estimating diaphragm excursion of a loudspeaker
ActiveUS20150124982A1Improve accuracyReduce computing loadVolume compression/expansion having semiconductor devicesTransducer circuit dampingAudio power amplifierEngineering
A method of estimating diaphragm excursion of an electrodynamic loudspeaker may be performed using audio signals. An audio output signal may be applied to a voice coil of the electrodynamic loudspeaker through an output amplifier to produce sound. A detected voice coil current and a determined voice coil voltage may be applied to a linear adaptive digital loudspeaker model that has a plurality of adaptive loudspeaker parameters. The parameter values of the adaptive loudspeaker parameters may be computed based on the linear adaptive digital loudspeaker model and applied to a non-linear state-space model of the electrodynamic loudspeaker. For the non-linear state-space model, a predetermined non-linear function may be applied to at least one of the plurality of received parameter values to compute at least one non-linearity compensated parameter value of the adaptive loudspeaker parameters, to determine an instantaneous excursion of the diaphragm.
Owner:ANALOG DEVICES INT UNLTD
Loudspeaker protection systems and methods
ActiveUS20150215704A1Reduce disadvantagesSignal processingTransducer protection circuitsElectrical resistance and conductanceControl signal
Methods and systems for thermal protection of a voice coil of a loudspeaker. The method involves driving the loudspeaker based on an input signal received at an input terminal and monitoring both a voltage applied to the voice coil and a current flowing through the voice coil. From the monitored voltage and current, an estimate of temperature of the voice coil and an estimate of power dissipation in the voice coil is determined. The method includes estimating the voice coil resistance based on the monitored voltage and current and at least the estimate of temperature is determined based the estimate of resistance. A gain control signal for modulating a gain applied to the input signal is generated as a function of both the estimate of temperature of the voice coil and the estimate of power dissipation in the voice coil. This means that high power dissipation, which would over long periods lead to overheating, can nevertheless be permitted when the voice coil temperature is low enough, while at high voice coil temperatures any gain modulation applied for thermal protection can be reduced if the power dissipation level drops.
Owner:CIRRUS LOGIC INC
Volume regulating and monitoring system
InactiveUS7003123B2Level avoidProtect a user's hearingSignal processingEar treatmentControl systemMonitoring system
A volume controlling system and method for regulating the output volume of a headset in order to protect the hearing ability of a user. The system includes a volume sensor / controller for monitoring the volume output of the headset by adjusting the volume to be within a predetermined threshold. A warning indicator indicates to the user or a person monitoring the listening user that the volume is set too high. The method include the steps of comparing the received audio signal to the predetermined volume threshold and adjusting the volume accordingly. The method also includes the steps of notifying that the volume has been set at too high a level by providing a warning signal, such as an audible or visual alarm.
Owner:IBM CORP
Headset capable of being used as external speaker and method for adjusting output an thereof
ActiveUS20090041267A1Reduce outputIncrease productionManually-operated gain controlHeadphones for stereophonic communicationAudio power amplifierTransducer
A headset used as an external louder speaker and a method for adjusting an output of the speaker transducers are disclosed. The headset includes a signal receiver, speaker parts, hinge parts, and amplifiers. The speaker parts change their direction through the hinge parts. The output of speaker transducers is adjusted according to the direction of the speaker parts. When the output of speaker transducers is increased, the speaker parts of the headset are used as an external speaker.
Owner:SAMSUNG ELECTRONICS CO LTD
Method of eliminating interference in a microphone
InactiveUS6895095B1Low processing expenditureEliminate distractionsTwo-way loud-speaking telephone systemsSpeech analysisMicrophone signalEngineering
A method of eliminating interference components in a microphone signal by generating a compensation signal and subtracting the compensation signal from the microphone signal. The compensation occurs completely in the frequency domain and the output signal is processed in the frequency domain as well. Measures for reducing the expenditure during the signal processing are specified. For example, advantageous modifications provide that a filter setting, obtained during a preceding speech pause, be used for eliminating interference in a voice signal and / or that the simulation filter be divided into several partial filters for long pulse responses. In particular, the invention is suitable for eliminating interference signal components, e.g., caused by a radio or the like, from a voice input signal in a motor vehicle, the source signal of which is available as reference signal.
Owner:NUANCE COMM INC
Loudspeaker production system having frequency band selective audio power control
InactiveUS6865274B1Less audibleLess disturbingTransducer protection circuitsLimiting amplitudeAudio power amplifierEngineering
A loudspeaker protection system includes a filter arrangement for defining one or more frequency bands of an audio signal, controllable amplifier / attenuator combinations coupled to the filter arrangement, and a processing arrangement coupled to control the amplifier / attenuator combinations, such as to determine audio power in at least one of the frequency bands representing relevant loudspeaker protection information used for selective audio power control in the at least one frequency band. This system has the features for a fast and / or slow thermal protection, as well as for a cone excursion protection, all for a loudspeaker in such a system.
Owner:U S PHILIPS CORP
Direct measurement of input signal to loudspeaker to determine and limit temperature of voice coil of the loudspeaker
Aspects of the disclosure pertain to a system and method for providing temperature limiting for a voice coil of a speaker. The system and method provide the aforementioned temperature limiting based upon monitoring (e.g., measurement) of an amplifier output signal provided to the speaker. Providing the aforementioned temperature limiting promotes improved protection for the speaker.
Owner:MAXIM INTEGRATED PROD INC
Reduced microphone handling noise
ActiveUS8787599B2Transducer protection circuitsTransmission noise suppressionEngineeringSignal processing
Methods and apparatuses for reduced microphone handling noise are disclosed. In one example, a microphone system includes a microphone to output a microphone output signal and a sensor adapted to output a sensor signal indicating whether the sensor is in proximity to or touching a user finger. A processor is adapted to process the microphone output signal using touch mode signal processing responsive to a determination the sensor is in proximity to or touching the user finger.
Owner:SIEMENS AUDIOLOGISCHE TECHN +1
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