A smart speaker device for acoustical listening area mapping and frequency correction includes a non-transitory storage configured to maintain a listening area response map indicating filter settings corresponding to each of a plurality of locations within a listening area, a microphone array, a loudspeaker; and a controller. The controller is programmed to execute a frequency correcting application to identify a current location of a mobile device in the listening area based on ultrasonic audio received to the microphone array from the mobile device, access the listening area response map to retrieve filter settings corresponding to the current location, and apply the filter settings to an audio stream to be output to the loudspeaker to correct for frequency response of the loudspeaker at the current location of the mobile device.

A technique for subband-based audio calibration includes receiving a first audio signal captured at a microphone and a second audio signal provided to a speaker. The technique continues by synchronizing the second audio signal with the first audio signal to generate a synchronized audio signal and transforming the synchronized audio signal to a first subband representation and the first audio signal to a second subband representation. The technique then includes calculating a transfer function associated with the speaker and the microphone based on the first subband representation and the second subband representation.

A diaphragm assembly for a miniature acoustical transducer having a sufficiently light paddle to allow good audio performance and a sufficiently stiff frame to allow handling. The paddle may be made of a thin sheet of aluminium and the frame of thicker aluminium or a bent sheet of aluminium.

The present invention provides a sound device and an electronic device using the sound device. The sound device includes a housing with an accommodating space, a sound unit accommodated in the housing and a control device arranged outside the housing. The sound unit divides the accommodating space into a front cavity and a rear cavity, and a through hole is arranged in a position of the housing corresponding to the rear cavity. The control device includes a sealing member sealing the through hole. When the control device presses the sealing member against the housing and the through hole is sealed by the sealing member, the sound device is in a first sound mode. When the control device disengages the sealing member from the housing and the through hole is not sealed by the sealing member, the sound device is in a second sound mode.

A nonlinear control system and a speaker protection system are disclosed. In particular, a control system for adapting an audio output from a speaker in the proximity of an object is disclosed. The controller is configured to accept one or more input signals, and one or more estimated states produced by the model to produce one or more control signals. A speaker protection system and a quality control system are disclosed. More particularly, a system for clamping the input to a speaker dependent upon an estimate of the proximity, acoustic volume, and/or acoustic coupling of the speaker to a nearby object is disclosed.

An electronic apparatus is provided. The electronic apparatus includes an output circuit, an input circuit, and a processor. The output circuit is connected to plural speaker devices. The processor controls the output circuit to cause each of the speaker devices to output an audio signal, and identifies whether each of the speaker devices is connected based on the audio signal received through the input circuit.

An ultrasonic generator includes a substrate, a lower electrode on the substrate, an upper electrode on the lower electrode, and an ultrasonic generation unit between the lower electrode and the upper electrode. The ultrasonic generation unit includes a vibration chamber and an ultrasonic generation layer on the vibration chamber. The ultrasonic generation layer is configured to propel a surrounding medium to vibrate to generate ultrasonic waves in response to a voltage difference between the upper electrode and the lower electrode.

Ultrasonic transducers that are capable of generating increased levels of ultrasound, as well as receiving ultrasonic waves with increased sensitivity. The ultrasonic transducers include a back cover, a protective front cover, a backplate, and a vibrator film layer disposed between the backplate and the protective front cover. The backplate includes a plurality of grooves formed on a surface thereof facing the vibrator film layer. Each groove includes upper edges having cross-sectional contours that gradually tend toward the deepest part of the groove to allow a larger area of the backplate to be closer to the vibrator film layer, thereby increasing the resulting electric field, and, consequently, increasing the output power and sensitivity of the ultrasonic transducer.

A digital audio system, which may be an integrated audio system of a vehicle, includes a microphone, a loudspeaker, and a processor. The processor is operable to modify digital audio signals based on tuning parameters to compensate for acoustic characteristics of the environment. The processor is further operable to detect that modification of digital audio signals based on the tuning parameters cannot fully compensate for the acoustic characteristics of the environment. The detection is based on an audio signal corresponding to audio captured from the environment and/or on the values of the tuning parameters. Upon detecting that modification of digital audio signals based on the tuning parameters cannot fully compensate for the acoustic characteristics of the environment, an indication is provided that the audio system should be calibrated to adjust the tuning parameters to the environment. Related methods and computer-readable media are also disclosed.

The invention provides a Diagonal Resonance (DR) mode for sound and ultrasound generation and reception. This new driving mode is made possible due to the anisotropic sound velocity in piezoelectric single crystals. This gives rise to a crossed slab active material, which contains the crossed-diagonals of the substantially rectangular shaped active material, exhibiting comparable resonance frequency. Due to reasonably large Piosson's ratios of lead-based relaxor single crystal, the resonance vibration of the active material in crossed face or body diagonal directions induces sufficiently large vibration amplitudes for sound and ultrasound generation via any free surface which could be normal or at an angle to the resonating diagonal directions. Said DR mode typically has lower resonance frequency than conventional longitudinal and transverse width modes but high TVR and can be combined or coupled with said two driving modes to make broadband to extra-broadband sonic and ultrasonic transducers.