Abstract: An ear tip for an earpiece including a body, an insertion end, and a retention structure. Some examples include an elongated fin along a portion of an outer leg of the retention structure. Some examples include an extended insertion end configured to insert further into a user's ear canal and including a mushroom cap for providing contact with an interior portion of the user's ear canal and to form an acoustic seal. Some examples may include an umbrella associated with the insertion end, between the mushroom cap and the body. Electrically conductive elements may be associated with any of the elongated fin, the umbrella, and the mushroom cap, to provide electrical contact with the user's skin for sensing electrical signals or for delivery of electrical stimulation.

Abstract: A system includes a first device having a microphone associated with a voice user interface (VUI) and a first network interface, a first processor connected to the first network interface and controlling the first device, a second device having a speaker and a second network interface, and a second processor connected to the second network interface and controlling the second device. Upon connection of the second network interface to a network to which the first network interface is connected, the second processor causes the second device to output an identifiable sound through the speaker. Upon detecting the identifiable sound via the microphone, the first processor adds information identifying the second device to a data store of devices to be controlled when the first device activates the VUI.

Abstract: A wireless communication method for transmitting data from at least one master to one or more slaves positioned at various spatial locations and configured for generally simultaneous reception of the data. The method includes dividing the data into a number of portions, transmitting at least some of the portions using different transmission configurations for the different portions, having one or more of the slaves measure the quality of transmission associated with the group of different transmission configurations, and processing the quality measurements to determine new transmission configurations for use in transmitting the data.

Abstract: In one aspect, in general, the invention features a method including a second wireless system determining a frequency of active operation of a first wireless system, and communicating wirelessly on the second wireless system in the vicinity of the wireless communication on the first wireless system, the wireless communication utilizing a spread-spectrum technique that excludes the determined frequency.