Patent application number | Description | Published |
20110150233 | DEVICE FOR AND A METHOD OF PROCESSING A SIGNAL | 06-23-2011 |
20110182435 | CONTROL OF A LOUDSPEAKER OUTPUT - A loudspeaker drive circuit comprises a signal path compressor/limiter ( | 07-28-2011 |
20110194705 | SYSTEM AND METHOD FOR ADAPTING A LOUDSPEAKER SIGNAL - A sound system | 08-11-2011 |
20110280415 | SOUND REPRODUCTION AND DETECTION - Apparatus for generating a first acoustic signal and simultaneously sensing a second acoustic signal. The apparatus comprises: an input ( | 11-17-2011 |
20120121098 | CONTROL OF A LOUDSPEAKER OUTPUT - A control signal is generated for mechanical loudspeaker protection, or for other signal pre-processing functions. The procedure contains the following steps:
| 05-17-2012 |
20120207314 | CONTROL OF A LOUDSPEAKER OUTPUT - A loudspeaker drive circuit comprises an input for receiving an audio signal and a signal processor for processing the audio signal before application to the loudspeaker. The signal processor processes the audio signal to derive a loudspeaker drive signal which results in the loudspeaker membrane reaching its maximum displacement in both directions of diaphragm displacement. | 08-16-2012 |
20120288118 | CONTROL OF A LOUDSPEAKER OUTPUT - A method of modeling the frequency-dependent input-voltage-to-excursion transfer function of a loudspeaker, comprises, for a plurality of measurement frequencies, measuring a voltage and current and deriving an impedance at the measurement frequency. A frequency-dependent impedance function is derived. | 11-15-2012 |
20120328113 | CONTROL OF A LOUDSPEAKER OUTPUT - A method of controlling a loudspeaker output comprises deriving an admittance function over time from the voice coil voltage and current. In combination with a delta function, the force factor of the loudspeaker and the blocked electrical impedance, the input-voltage-to-excursion transfer function over time is obtained. This is used to control audio processing for the loudspeaker thereby to implement loudspeaker protection and/or acoustic signal processing. | 12-27-2012 |
20120328117 | CONTROL OF A LOUDSPEAKER OUTPUT - A loudspeaker drive circuit uses a dynamic range compressor to implement a non-linear gain function between the input signal to the dynamic range compressor and an output signal from the dynamic range compressor. The output is used to drive a loudspeaker, and the operating parameters of the dynamic range compressor are varied in dependence on a criterion, such as the estimated voice coil temperature, the power consumption or the acoustical distortion. | 12-27-2012 |
20130182851 | PROCESSOR FOR AN FM SIGNAL RECEIVER AND PROCESSING METHOD - A processing unit for processing a multi-channel audio signal has a delay element ( | 07-18-2013 |
20130251164 | LOUDSPEAKER DRIVE CIRCUIT FOR DETERMINING LOUDSPEAKER CHARACTERISTICS AND/OR DIAGNOSTICS - A loudspeaker amplifier drive circuit performs analysis of various signals relating to the input and output of the amplifier such that the characteristics and/or diagnostics of a loudspeaker driven by the amplifier can be derived. These are then presented as outputs, so that different circuitry can make use of the information for audio signal processing. | 09-26-2013 |
20130251167 | CONTROL OF A LOUDSPEAKER OUTPUT - A loudspeaker drive circuit has a microphone which forms part of an acoustic echo cancellation system. An input signal is processed before application to a loudspeaker driver, and the processing is controlled in dependence on the echo cancellation system performance, such as to control the extent to which the loudspeaker is driven into a non-linear operating region. In this way, the linearity can be controlled so as to provide an excursion limit, without needing a model of the loudspeaker or additional dedicated sensors. | 09-26-2013 |
20140072122 | MULTIPATH INTERFERENCE REDUCTION - The invention provides an audio signal processing system in which a magnitude spectrum of a frequency domain audio signal is processed based on a measure of multipath interference. The processing keeps the magnitude spectrum approximately fixed during periods of multipath interference, for example by replacing it with a temporally smoothed version of the magnitude spectrum. The magnitude spectrum (processed if required) and the phase spectrum are combined to derive a frequency domain output, which is transformed to the time domain. | 03-13-2014 |
20140072123 | DIGITAL AUDIO PROCESSING SYSTEM AND METHOD - Systems and method for audio processing are disclosed. Left and right channels of an audio data stream are combined to derive sum and difference signals. A time domain to frequency domain converter is provided for converting the sum and difference signals to the frequency domain. a first processing unit is provided for deriving a frequency domain noise signal based at least partly on the frequency domain difference signal. A second processing unit is provided for processing the frequency domain sum signal using the noise signal thereby to reduce noise artifacts in the sum signal. A frequency domain to time domain converter is provided for converting at least the processed frequency domain sum signal to the time domain. | 03-13-2014 |
20140072132 | METHOD AND SYSTEM FOR REDUCING IMPULSIVE NOISE DISTURBANCE - FM and AM receivers in car environments require a noise blanker circuit or method to reduce the audible disturbances generated by impulse noise, such as ignition noise, in the audio signal. The invention proposes a combination of time-domain and frequency-domain processing to reduce the audible distortion. The time-domain processing interpolates the signal during the impulse noise bursts, and the frequency-domain processing disperses the remaining signal distortion over time, or relocates it to positions in time where it is attenuated by a windowing technique. | 03-13-2014 |
20140169590 | SYSTEM FOR BLENDING SIGNALS - A time modification system is disclosed. The time modification module includes a delay module for receiving an input signal comprising a series of digital samples at an input sample rate. The delay module provides a delayed output signal. The time modification module further includes a duration modification module for receiving the input signal or a delayed version thereof, and providing a modified output signal. A first switch is included for selecting either the delayed output signal or the modified output signal. | 06-19-2014 |