Class / Patent application number | Description | Number of patent applications / Date published |
381096000 | LOUDSPEAKER FEEDBACK | 11 |
20090003628 | DRIVERS AND METHODS FOR DRIVING A LOAD - Embodiments of the present invention provide methods and devices for controlling a command signal applied to a load. In embodiments of the invention, current through and voltage across a load are determined and the values of both are used to generate a hybrid control signal. For example, in some embodiments the hybrid control signal is generated by taking a weighted summation of the current and voltage control signals. In other embodiments, a percentage of the difference between the current and voltage control signals is added to one of the current or voltage control signals to generate the hybrid control signal. In one embodiment, a potentiometer is used to generate the hybrid control signal. | 01-01-2009 |
20090067643 | Method and Apparatus to Reduce the Effect of Flux modulation in Speakers - A speaker feedback system has a linear current feedback derived from a current sensing resistor. A linear motional feedback from the active speaker driver is derived from a sensing coil mechanically coupled with the driver coil of the speaker, the driver coil receiving electrical energy from the power amplifier. A motional signal correction circuit extracts the motional signal from the sensing coil and feeds to input B of the multiplier. A current filter circuit filters out higher-frequency signals from the current feedback signal and then feeds to input A of the multiplier. A multiplier performs the multiplication function of its two inputs and produces an output. Post-multiplier equalization circuitry that control the feedback gain of the nonlinear feedback system such that it can effectively compensate for the effect of flux modulation over the targeted frequency range. A feedback network feeds the output from post multiplier equalization to the power amplifier. | 03-12-2009 |
20100232623 | TRANSDUCER DEVICE INCLUDING FEEDBACK CIRCUIT - A transducer device includes an acoustic transducer, a parameter extractor and a feedback circuit. The parameter extractor is configured to extract an operating parameter from the acoustic transducer. The feedback circuit is configured to generate a correction signal based on a difference between the extracted operating parameter and a corresponding reference parameter. The correction signal is applied to adjust the operating parameter of the acoustic transducer. | 09-16-2010 |
20110085678 | SYSTEM FOR PREDICTING THE BEHAVIOR OF A TRANSDUCER - A system for compensating and driving a loudspeaker includes an open loop loudspeaker controller that receives and processes an audio input signal and provides an audio output signal. A dynamic model of the loudspeaker receives the audio output signal, and models the behavior of the loudspeaker and provides predictive loudspeaker behavior data indicative thereof. The open loop loudspeaker controller receives the predictive loudspeaker behavior data and the audio input signal, and provides the audio output signal as a function of the audio input signal and the predictive loudspeaker behavior data. | 04-14-2011 |
20110103616 | TUNING SOUND FEED-BACK DEVICE - Disclosed is a tuning sound (TS) feedback apparatus. The tuning sound (TS) feedback apparatus includes: a TS pick-up casing which is disposed and fixed inside or near the hearing organ of a sound engineer who manages tuning operations for sound output from a sound output terminal of a sound device having an equalizer; a sound/electric conversion element which is included in the TS pick-up casing, picks up the TS output from the sound output terminal of the sound device, and converts the picked-up TS into an electrical signal; and a TS output module which is included in the TS pick-up casing, converts the TS converted into the electrical signal by the sound/electric conversion element into wired or wireless communication data to be used for external communication, and transmits the data to the sound device. | 05-05-2011 |
20120230513 | SIGNAL PROCESSING DEVICE AND SIGNAL PROCESSING METHOD - A signal processing device includes: a combining section combining a digital feedback signal associated with a movement of a diaphragm of a speaker unit and a digital audio signal; and a control section controlling the level of the digital feedback signal according to a difference between the level of the digital feedback signal and the level of the digital audio signal. | 09-13-2012 |
20120230514 | SIGNAL PROCESSING DEVICE AND SIGNAL PROCESSING METHOD - A signal processing device includes: a detection unit generating a digital detection signal corresponding to motion of a diaphragm of a speaker to output the digital detection signal; a gain adjustment unit generating a digital feedback signal by multiplying the outputted digital detection signal by again coefficient to output the generated digital feedback signal; a combining unit combining the outputted digital feedback signal with a digital audio signal; a storage unit storing plural gain coefficients; and a control unit performing control so that a given gain coefficient is selected from the plural gain coefficients and that the selected gain coefficient is used for the multiplication. | 09-13-2012 |
20130301853 | INDUCED SIGNAL REMOVING CIRCUIT - [Object] To provide an induced signal removing circuit that feeds back induced voltage regarded as electrical signals into the input side of an inductive load to remove the induced voltage from the metal part, the induced voltage appearing even across an insulated metal part in response to signals input to the inductive load. | 11-14-2013 |
20140105417 | AUDIO SIGNAL PLAYBACK SYSTEM AND ELECTRONIC DEVICE - The present invention relates to the field of signal processing technologies, and provides an audio signal playback system and an electronic device. The system includes: two or more loudspeakers, configured to separately play audio signals in different frequency bands; a filter unit, configured to filter an input audio signal, amplify the filtered audio signal, and output the amplified audio signal to the two or more loudspeakers; and a feedback control unit, configured to collect the audio signals played by the two or more loudspeakers, measure power values of the audio signals in different frequency bands, and adjust, according to an measurement result, a amplification factor of the filter unit for the filtered audio signal in a corresponding frequency band. | 04-17-2014 |
20160080865 | SYSTEMS AND METHODS FOR REDUCTION OF AUDIO ARTIFACTS IN AN AUDIO SYSTEM WITH DYNAMIC RANGE ENHANCEMENT - In accordance with embodiments of the present disclosure, a control circuit may be configured to, responsive to an indication to switch between gain modes of a signal path having an analog path portion and a digital signal path portion, switch a selectable analog gain of the analog path portion between a first analog gain and a second analog gain, switch a selectable digital gain of the digital signal path portion between a first digital gain and a second digital gain, wherein the product of the first analog gain and the first digital gain is approximately equal to the product of the second analog gain and the second digital gain, and control an analog response of the signal path to reduce the occurrence of audio artifacts present in the output signal as a result of the switch between gain modes of the signal path. | 03-17-2016 |
20160105758 | SOUND SOURCE REPLICATION SYSTEM - Method for replicating directional sound detecting a plurality of sound signals emitted by a sound source in a recording space and recording the plurality of detected sound signals emitted by the sound source. The method also configured for determining, in a time variable manner, a main direction of emission of the plurality of sound signals, and reproducing the plurality of sound signals based on the main direction of emission using a first reproduction unit associated with the sound source and at least one second reproduction unit spaced apart from the first reproduction unit. The main direction of emission is simulated in during the reproduction with the at least one second reproduction unit using time delays relative to the first reproduction unit. | 04-14-2016 |