US 12,739,558 B2 · Force-cancelling, isobaric audio system with configurable bass and privacy modes

Abstract

An audio system comprises a plurality of membranes within an enclosure. A first surface of each membrane is part of a shared back volume within the enclosure and pressure within the shared back volume is configured to be isobaric. A second surface of each membrane is part of a front volume within the enclosure that includes a plurality of ports. A controller of the audio system is configured to drive the plurality of membranes. In a mode of operation, the controller is configured to match audio output between the plurality of ports, forming pressure waves of equal amplitude and opposite phase and generating a substantially dipole or linear quadrupole sound wave radiation pattern for frequencies above a predefined threshold and mismatch audio output between the plurality of ports for frequencies at or below the predefined threshold to generate a substantially monopole or cardioid sound wave radiation pattern.

Claims20

Dependent claims

A method comprising:

determining a first mode of operation of an audio device;
generating, based at least in part on the determined first mode of operation, first mode input signals for voice coils that drive a plurality of membranes of the audio device, a first surface of each of the plurality of membranes being part of a shared back volume within an enclosure, a second surface of each of the plurality of membranes being part of a front volume within the enclosure that includes a plurality of ports, and pressure within the shared back volume being substantially isobaric;
and
providing a driving current through the voice coils in accordance with the first mode input signals, such that the plurality of membranes generates sound that is output from the plurality of ports to form a first sound wave radiation pattern of a plurality of predetermined sound wave radiation patterns that are associated with different modes of operation.

1 more element

One or more non-transitory computer-readable storage media comprising instructions stored thereon, the instructions, when executed by one or more processors of a device, causing the device to:

determine a first mode of operation of the device;
generate, based at least in part on the determined first mode of operation, first mode input signals for voice coils that drive a plurality of membranes of the device, a first surface of each of the plurality of membranes being part of a shared back volume within an enclosure, a second surface of each of the plurality of membranes being part of a front volume within the enclosure that includes a plurality of ports, and pressure within the shared back volume being substantially isobaric;
and
provide a driving current through the voice coils in accordance with the first mode input signals, such that the plurality of membranes generates sound that is output from the plurality of ports to form a first sound wave radiation pattern of a plurality of predetermined sound wave radiation patterns that are associated with different modes of operation.

1 more element

Dependencies are inferred from the claim text.

Force-cancelling, isobaric audio system with configurable bass and privacy modes

Life of this patent

Force-cancelling, isobaric audio system with configurable bass and privacy modes

Life of this patent

Abstract

Claims20