Abstract: An audio-haptic signal generator for a haptic system including an amplifier coupled to a haptic actuator is described. The audio-haptic signal generator includes an audio input configured to receive an audio signal; a haptic input configured to receive a haptic signal and a controller configured to receive to at least one of the haptic signal, an amplifier state and a haptic actuator state. A mixer is coupled to the audio input and the haptic input. The mixer has an output configured to be coupled to a haptic actuator. The controller controls the mixer to process the audio signal dependent on at least one of a characteristic of the haptic signal, an amplifier state, and a haptic actuator state. The mixer is configured to mix the haptic signal and processed audio signal on to output the mixed haptic signal and processed audio signal.

Abstract: An apparatus and a method for generating a voice coil actuator (VCA) signal is described. A drive signal is generated to drive the VCA and a resulting current signal from the VCA detected. The frequency of the drive signal is adapted in response to detecting an asymmetry in the current signal.

Abstract: A peak current limiter for an audio system comprising at least two audio amplifiers is described. The peak current limiter comprises at least two audio inputs; at least two audio outputs, each audio output being coupled to a respective one of the at least two audio inputs and configured to be coupled to a respective one of the at least two audio amplifiers. The peak current limiter is configured to receive an audio signal on each of the respective audio inputs. The peak current limiter determines a current value required by each of at least two audio amplifiers. An audio characteristic of at least one of the received audio signals is modified to limit the total current supplied to the at least two amplifiers below a predefined maximum current value.

Abstract: An audio-haptic signal generator for a haptic system including an amplifier coupled to a haptic actuator is described. The audio-haptic signal generator includes an audio input configured to receive an audio signal; a haptic input configured to receive a haptic signal and a controller configured to receive to at least one of the haptic signal, an amplifier state and a haptic actuator state. A mixer is coupled to the audio input and the haptic input. The mixer has an output configured to be coupled to a haptic actuator. The controller controls the mixer to process the audio signal dependent on at least one of a characteristic of the haptic signal, an amplifier state, and a haptic actuator state. The mixer is configured to mix the haptic signal and processed audio signal on to output the mixed haptic signal and processed audio signal.

Abstract: An audio-haptic signal generator for a haptic system including an amplifier coupled to a haptic actuator is described. The audio-haptic signal generator includes an audio input configured to receive an audio signal; a haptic input configured to receive a haptic signal and a controller configured to receive to at least one of the haptic signal, an amplifier state and a haptic actuator state. A mixer is coupled to the audio input and the haptic input. The mixer has an output configured to be coupled to a haptic actuator. The controller controls the mixer to process the audio signal dependent on at least one of a characteristic of the haptic signal, an amplifier state, and a haptic actuator state. The mixer is configured to mix the haptic signal and processed audio signal on to output the mixed haptic signal and processed audio signal.

Abstract: A signal processor for performing signal enhancement, the signal processor comprising: an input-terminal, configured to receive an input-signaling; an output-terminal; an interference-cancellation-block configured to receive the input-signaling and to provide an interference-estimate-signaling and an interference-cancelled-signal based on the input-signaling. The signal processor further comprises a feature-block configured to provide a combination-feature-signal based on the interference-cancelled-signal and the interference-estimate-signaling; and a neural-network-block configured to apply model parameters to the combination-feature-signal to provide a neural-network-output-signal to the output-terminal.

Abstract: A controller for an audio system. The audio system comprising an audio processor and an amplifier. The controller is configured to: receive an amplifier-operating-condition-signal representative of an operating condition of the amplifier; receive a maximum-threshold-value; and generate control signaling based on the amplifier-operating-condition-signal and the maximum-threshold-value, wherein the control signaling is configured to set an operating parameter of the audio processor.

Abstract: A mechanism to adjust far-end signal loudness based on environmental noise levels and device speaker characteristics has a noise-level analyzer that receives feedback from an intelligent speaker-boosting logic circuit that provides a signal to a class-D amplifier to drive the speaker. The noise-level analyzer analyzes near-end environmental noise levels and far-end speech input signal levels across critical frequency bands. The noise-level analyzer performs a masking analysis of the far-end and near-end signals, and guides the speaker-boosting logic circuit to apply determined signal boosting levels over selective bands. The speaker-boosting logic circuit monitors system activity along with the selective band boosting guidance from the noise-level analyzer. Using device speaker information and the speaker excursion pattern, the speaker-boosting logic circuit adjusts far-end speech signal loudness without over excursion of the speaker and damage to the speaker hardware.

Abstract: A method and apparatus for generating a haptic signal is described. An audio signal is received and an event signal comprising a plurality of pulses is determined from a characteristic of the audio signal. A haptic output signal is generated by combining a haptic pattern triggered by a first pulse and at least one further substantially identical haptic pattern triggered by at least one further pulse.

Abstract: A controller for a haptic actuator is described. The controller includes a driver which has an output configured to be coupled to a linear resonant actuator in a first mode and a frequency detector having an input configured to be coupled to the haptic actuator in a second mode. The frequency detector is configured to detect a signal generated on the terminals of the haptic actuator in response to an externally applied force and to determine a resonant frequency of the haptic actuator from the generated signal.

Abstract: An audio processor for a multi voice coil acoustic transducer is described. The audio processor may receive or generate an audio signal. The audio signal may have one or more phase shifts applied. The audio signal may be used to drive a first coil of a dual voice coil acoustic transducer. The phase-shifted audio signals may drive the other coils of a multi voice-coil acoustic transducer. The phase shift is selected so that the phase difference between the audio signal driving each voice coil may result in destructive interference in the multi voice-coil loudspeaker resulting in reduced or no acoustic output due to the audio signal.

Abstract: A method and apparatus of acoustic processing for a mobile device having a haptic actuator is described. A vibration drive signal for driving a haptic actuator is received. A vibration noise output from a haptic actuator is detected. At least one vibration noise metric from the detected vibration noise output and the vibration drive signal is generated. The vibration noise output level is adapted in dependence of the at least one vibration noise metric.

Abstract: Various exemplary aspects are directed to acoustic context recognition apparatuses and methods involving isolating and identifying context(s) of an acoustic environment. In one exemplary embodiment, source audio is converted into audio spectrograms, each spectrogram indicative of a period of time. The series of spectrograms are analyzed to identify audio patterns, over a period of time, which are indicative of an environmental context of the source audio. In many embodiments of the present disclosure, acoustic context recognition also includes comparing the identified audio patterns to known environmental contexts.