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51. 发明授权

US10149050B2 Temperature monitoring for loudspeakers 有权
公开(公告)号：US10149050B2
公开(公告)日：2018-12-04
申请号：US15315845
申请日：2015-06-04
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： John Paul Lesso
IPC分类号： H04R3/00 , H04R29/00 , H03G3/30 , H03F3/217
摘要： This application relates to methods and apparatus for determining the temperature of a voice coil of a loudspeaker (204), for instance as part of a system (208) for protecting the loudspeaker from overheating. The method comprises driving the voice coil with signal components at first and second frequencies, wherein the first frequency (fH) is higher than the second frequency (fL), and determining first and second indications of current (ICM) and voltage (VCM) of the voice coil at said first and second frequencies respectively. The method involves determining an estimated ratio value using the first and second indications of current and voltage, wherein said estimated ratio value corresponds to a ratio between a value based on the resistance of the voice coil and a value based on the inductance of the voice coil. The temperature of the voice coil is then determined based on said estimated ratio value and at least one reference value. An impedance extraction module (210) may extract values for the impedance at the first and second frequencies respectively (ZH, ZL). In some embodiments a module (212) may determine estimated values of the resistance (REM) and inductance (LEM) of the voice coil which are used by temperature estimation block (214) to determine the temperature.

52. 发明授权

US10147413B2 Noise cancellation system with lower rate emulation 有权
公开(公告)号：US10147413B2
公开(公告)日：2018-12-04
申请号：US15482258
申请日：2017-04-07
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： Anthony J. Magrath , Richard Clemow
IPC分类号： G10K11/178 , H04R3/00
摘要： A noise cancellation system, comprising: an input for a digital signal, the digital signal having a first sample rate; a digital filter, connected to the input to receive the digital signal; a decimator, connected to the input to receive the digital signal and to generate a decimated signal at a second sample rate lower than the first sample rate; and a processor. The processor comprises: an emulation of the digital filter, connected to receive the decimated signal and to generate an emulated filter output; and a control circuit, for generating a control signal on the basis of the emulated filter output. The control signal is applied to the digital filter to control a filter characteristic thereof.

53. 发明授权

US10142730B1 Temporal and spatial detection of acoustic sources 有权
公开(公告)号：US10142730B1
公开(公告)日：2018-11-27
申请号：US15714262
申请日：2017-09-25
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： Nima Yousefian , Seth Suppappola
IPC分类号： H04R3/00 , H04R3/04 , H04R1/40
摘要： Noise sources may be identified as either an interference source, such as a television, or a talker source by analyzing phase information of the microphone signals. A phase delay variance may be computed from pairs of microphone signals. A profile of an interference source may be learned over time by updating a stored profile when the phase delay variance is below a threshold. The stored profile may be used to identify interference sources received by the microphones by determining a correlation between the microphone signals and the stored profile. When an interference source is detected, control parameters may be generated to control a beamformer to reduce contribution of the interference source to an output audio signal. The output audio signal may be used for speech processing, such as in a smart home device.

54. 发明授权

US10128828B2 Synchronous, internal clock edge alignment for integrated circuit testing 有权
公开(公告)号：US10128828B2
公开(公告)日：2018-11-13
申请号：US15485062
申请日：2017-04-11
申请人： Cirrus Logic International Semiconductor, Ltd.
发明人： Muraleedharan Ramakrishnan , Bhoodev Kumar , Vivek Oppula , Niju Alex Geevarughese
IPC分类号： H03L7/00 , H03K5/26
摘要： A synchronous clock edge alignment system and method increases detection coverage of transition delay faults that occur in logic circuits that have data released by a clock at an input of logic circuits internal to an integrated circuit and/or released at the output of the logic circuits when testing an integrated circuit. To increase detection coverage of inter-clock transition delay faults, in at least one embodiment, the synchronous clock edge alignment system and method align same transition type edges of internal data releasing clock signals, and at least two of the clock signals have different frequencies. By aligning the edges of the clock signals, transition delay faults that might otherwise not have occurred can be detected by, for example, a conventional circuit testing apparatus. Thus, aligning the edges of the clock signals increases detection of inter-clock transition delay faults.

55. 发明授权

US10127919B2 Determining noise and sound power level differences between primary and reference channels 有权
公开(公告)号：US10127919B2
公开(公告)日：2018-11-13
申请号：US14938798
申请日：2015-11-11
申请人： Cirrus Logic Inc.
发明人： Jan S. Erkelens
IPC分类号： H04R29/00 , G10L21/0232 , G10L25/12 , G10L25/21 , H04R3/00
摘要： A method for estimating a noise power level difference (NPLD) between a primary microphone and a reference microphone of an audio device includes obtaining primary and reference channels of an audio signal with primary and reference microphones of an audio device and estimating a noise magnitude of the reference channel of the audio signal to provide a noise variance estimate for one or more frequencies. A modelled probability density function (PDF) of a fast Fourier transform (FFT) coefficient of the primary channel of the audio signal is maximized to provide a NPLD between the noise variance estimate of the reference channel and a noise variance estimate of the primary channel. A modelled PDF of an FFT coefficient of the reference channel of the audio signal is maximized to provide a complex speech power level difference (SPLD) coefficient between the speech FFT coefficients of the primary and reference channel. A corrected noise magnitude of the reference channel is then calculated based on the noise variance estimate, the NPLD and the SPLD coefficient.

56. 发明授权

US10123143B2 Correction for speaker monitoring 有权
公开(公告)号：US10123143B2
公开(公告)日：2018-11-06
申请号：US15276437
申请日：2016-09-26
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： Vamsikrishna Parupalli , Lingli Zhang , Jeremy Babcock , Marc L. Tarabbia
IPC分类号： H04R29/00 , H04R3/00
摘要： Errors in measurements of a resistor to monitor current through a speaker may be corrected to improve the accuracy, performance, or quality of other signals affected by the measurement. Error may occur in the current measurement resulting from variations in measurements involving the resistor, such as errors based on the sense resistor's response to temperature or voltage differential. Correcting the measurement errors can prevent the overcurrent condition from occurring, and otherwise improve audio output from the speaker. Thus, a method for correcting measurements in a speaker monitoring circuit may include monitoring a current through a speaker by receiving a measurement that is correlated to the current output through the speaker; and correcting the measurement for one or more inaccuracies in the measurement.

57. 发明授权

US10117028B2 Stress decoupling in MEMS transducers 有权
公开(公告)号：US10117028B2
公开(公告)日：2018-10-30
申请号：US15417507
申请日：2017-01-27
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： David Talmage Patten , Tsjerk Hans Hoekstra
IPC分类号： H04R19/04 , H04R1/04 , B81B3/00 , H04R19/00 , B81B7/00
摘要： A MEMS transducer (200) comprises a substrate (101) having a first surface (102) and a membrane (103) formed relative to an aperture in the substrate. The MEMS transducer (200) further comprises one or more bonding structures (107) coupled to the substrate, wherein the one or more bonding structures (107), during use, mechanically couple the MEMS transducer to an associated substrate (111). The MEMS transducer (200) comprises a sealing element (109) for providing a seal, during use, in relation to the substrate (101) and the associated substrate (111). A stress decoupling member (119) is coupled between the substrate (101) and the sealing element (109).

58. 发明授权

US10114392B2 Variable ratio charge pump with peak current and average current limiting circuitry 有权
公开(公告)号：US10114392B2
公开(公告)日：2018-10-30
申请号：US15800743
申请日：2017-11-01
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： Eric J. King , Christian Larsen , Aaron J. Brennan
IPC分类号： H02M3/07 , G05F1/573 , F04D15/00 , H02M1/32 , H03F3/217 , H03K17/16 , H03F1/02 , H03F3/72
摘要： A method of increasing a multiplication ratio of a charge pump, the multiplication ratio defining a relationship between an output voltage of the charge pump and an input voltage of the charge pump, comprising: analyzing a first efficiency of the charge pump when the multiplication ratio is at a first ratio, calculating a second efficiency of the charge pump when the multiplication ratio is a second ratio lesser than the first ratio, and based on the first efficiency and the second efficiency, determining at least one of a target output power and a target output voltage at which to change the multiplication ratio from the second ratio to the first ratio.

59. 发明授权

US10111001B2 Method and apparatus for acoustic crosstalk cancellation 有权
公开(公告)号：US10111001B2
公开(公告)日：2018-10-23
申请号：US15708890
申请日：2017-09-19
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： Vitaliy Sapozhnykov , Henry Chen
IPC分类号： H04R3/14 , H04R5/04 , H04R3/04
摘要： A crosstalk canceller for reducing acoustic crosstalk at a time of audio playback is derived by forming a channel frequency response for a nominated playback geometry, and decomposing the channel frequency response to derive a decomposition element such as a singular value decomposition matrix. A value of the decomposition element, such as the smallest singular value, is then adjusted to reduce spectral coloration, and filter coefficients of a crosstalk cancellation filter are derived from the adjusted decomposition element.

60. 发明授权

US10091579B2 Microphone mixing for wind noise reduction 有权
公开(公告)号：US10091579B2
公开(公告)日：2018-10-02
申请号：US15312874
申请日：2015-05-26
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： Henry Chen
IPC分类号： H04R3/00 , H04R1/40 , H04R5/04
摘要： Wind noise reduction in microphone signals. A first microphone signal is obtained from a first omnidirectional microphone and, contemporaneously, a second microphone signal is obtained from a second omnidirectional microphone. The first and second microphone signals are mixed to produce an output signal. Mixing involves weighting the first and second microphone signals by respective first and second signal weights to produce respective first and second weighted microphone signals, and summing the first and second weighted microphone signals together to produce the output signal. The first and second signal weights are calculated to minimize the power of the output signal.

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