7 results about "Parametric loudspeaker" patented technology

The application provides a loudspeaker voice coil temperature detection method and device, electronic equipment and storage medium, and relates to the technical field of signal processing. The loudspeaker voice coil temperature detection method comprises: obtaining the current input power of the voice coil of the loudspeaker; inputting the current input power into a voice coil temperature detection model for representing the mapping relationship between the input power of the voice coil of the loudspeaker and the temperature of the voice coil of the loudspeaker, to obtain the target temperature of the voice coil of the loudspeaker output by the voice coil temperature detection model; wherein the voice coil temperature detection model is a second-order loudspeaker heat transfer model established based on target thermal parameters, and the target thermal parameters at least include a first target thermal parameter between the voice coil of the loudspeaker and the magnetic circuit of the loudspeaker, a second target thermal parameter between the magnetic circuit of the loudspeaker and the air, and a third target thermal parameter of the voice coil of the loudspeaker and the air convection. The technical scheme provided by the application realizes the detection of the voice coil temperature of the loudspeaker, and improves the precision of the voice coil temperature detection.

An ultrasonic transducer includes a diaphragm, one or more frame bodies extending in a longitudinal direction and bonded to the diaphragm, and one or more ultrasonic vibrators attached to the respective one or more frame bodies and facing the diaphragm with a space in between. The diaphragm is structured to resonate and vibrate in a direction orthogonal to the diaphragm in a phase opposite to a phase of the one or more ultrasonic vibrators. A dimension in the longitudinal direction inside the one or more frame bodies is larger than a dimension in a lateral direction orthogonal to the longitudinal direction inside the one or more frame bodies. One or more cavities cause an external space on an opposite side from the one or more frame bodies with respect to the diaphragm and an internal space inside the one or more frame bodies to communicate with each other.

An ultrasonic transducer includes a diaphragm, a frame, an ultrasonic vibrator, and a resonance plate. The frame extends in a longitudinal direction and is bonded to the diaphragm. The ultrasonic vibrator is attached to the frame, respectively, and faces the diaphragm with a space therebetween. The resonance plate extends along the longitudinal direction and faces the diaphragm with a gap therebetween, on a side opposite to the frame with respect to the diaphragm. The diaphragm vibrates resonantly perpendicular to the diaphragm, in a phase opposite to the ultrasonic vibrator. A dimension of an inner side portion of the frame in the longitudinal direction is greater than a dimension of the inner side portion of the frame in a lateral direction perpendicular. When a wavelength converted from a driving frequency of the ultrasonic vibrator is λ, a λ / 2 air resonance can occur in the gap in the lateral direction.

An ultrasonic transducer includes a first diaphragm, one or more frame bodies, and one or more ultrasonic vibrators. The one or more frame bodies extend in a length direction and are bonded to the first diaphragm. The one or more ultrasonic vibrators are attached to the one or more frame bodies, respectively, and face the first diaphragm with a space therebetween. The first diaphragm is structured to resonate and vibrate in a direction orthogonal or substantially orthogonal to the first diaphragm in a phase opposite to a phase of the one or more ultrasonic vibrators. A dimension in the length direction inside the one or more frame bodies is equal to or greater than four times a dimension in a width direction orthogonal to the length direction inside the one or more frame bodies.

The invention provides a sound system and an in-vehicle communication support system, which can suppress the disadvantage of ultrasonic radiation through a parametric speaker and increase the reproduction level of audible sound. Ultrasonic waves, which have been amplitude-modulated with audible sound emitted from a parametric speaker (1), are incident on an audible sound collector (2) with high directivity. The audible sound collector (2) attenuates incident ultrasonic waves and ultrasonic waves in audible sound self-demodulated from the ultrasonic waves, reflects the audible sound, and collects sound at a position in the vicinity of a user. The audible sound collector (2) can be configured from a reflector (21) having a reflecting surface that is a paraboloid of revolution and a sound absorber (22) that absorbs sound of ultrasonic waves, and the sound absorber (22) can be configured using an inverter tube (221) and a sound absorbing material using a photonic crystal.

According to the present invention, the dimension of the inside of at least one frame body (120) in the long-side direction is at least four times the dimension of the inside of the at least one frame body (120) in the short-side direction orthogonal to the long-side direction, and is greater than the minimum dimension (Lm) of at least one ultrasonic transducer (130) in the long-side direction. An average distance (L3) in the long-side direction of a gap between at least one end edge (120e) of an inner peripheral surface (120s) of the at least one frame body (120) in the long-side direction and at least one end edge (130e) of a surface (130s) on the frame body (120) side of the at least one ultrasonic transducer (130) in the long-side direction is 1.3 times or less the dimension (L2) of the inside of the at least one frame body (120) in the short-side direction.

An acoustic system and an in-vehicle communication support system that increase the audible sound reproduction level of a parametric loudspeaker while mitigating disadvantages of ultrasonic radiation are provided. An ultrasonic wave amplitude-modulated with audible sound, emitted from a parametric loudspeaker enter an audible sound collector with a high directivity. Of incident ultrasonic wave and incident audible sound self-demodulated from the ultrasonic wave, the audible sound collector attenuates the ultrasonic wave, and reflects the audible sound to be collected at a position near the user. The audible sound collector can be composed of: a reflector having a reflecting surface formed of a paraboloid of revolution; and a sound absorber for absorbing an ultrasonic wave. The sound absorber can be composed of a sound absorbing material made of a phononic crystal, or of resonance tubes.