Abstract: A wireless earbud including a shell housing having an inner shell portion and an outer shell portion. The inner shell portion has an inwardly facing ovate-shaped surface with a forward end portion configured to fit toward the user's ear canal, and a rearward end portion configured to fit in the concha of the user's ear. The outer shell portion has an outwardly facing surface and one or more outwardly protruding abutment surfaces configured to engage other parts of the user's ear to restrict rotation and prevent the earbud from falling out. For example, a first abutment may engage the user's tragus, a second abutment may engage the user's antitragus, and the first and second abutments may together form a convex surface that fits within the user's intertragical notch. Additional protrusions or surfaces may be provided to further improve the self-locking functionality of the earbud in the user's ear.

Abstract: A wireless earbud including a shell housing having an inner shell portion and an outer shell portion. The inner shell portion has an inwardly facing ovate-shaped surface with a forward end portion configured to fit toward the user's ear canal, and a rearward end portion configured to fit in the concha of the user's ear. The outer shell portion has an outwardly facing surface and one or more outwardly protruding abutment surfaces configured to engage other parts of the user's ear to restrict rotation and prevent the earbud from falling out. For example, a first abutment may engage the user's tragus, a second abutment may engage the user's antitragus, and the first and second abutments may together form a convex surface that fits within the user's intertragical notch. Additional protrusions or surfaces may be provided to further improve the self-locking functionality of the earbud in the user's ear.

Abstract: Apparatus and methods controlling a process producing segments of product wherein a destabilizing event of a particular type periodically destabilizes the process, resulting in product or process deviation from a target parameter associated with a number of segments of the product, from segment number 1 to segment number n. The method associates, with respective ones of the n units of product, deviation amounts corresponding to historical deviation amounts for the respective so-numbered units of product in past occurrences of the particular type destabilizing event, and applying to selected ones of the n segments of product correction factors derived from respective associated historical deviation amounts for the respective units of product, thereby making pro-active adjustments to respective ones of the n units of product, upon occurrence of the destabilizing event. Preferred methods include applying the correction factors to each of the n units of product.