Abstract: Embodiments provide for improved determination of whether an audio protector is sufficiently fit to a wearer. By automatically performing the improved fit testing processes described, embodiments may warn users in circumstances where fit of their audio protector is dissatisfactory. Some embodiments include receiving external audio data and internal audio data including a filtered range of frequencies, generating comparative internal data by applying the internal audio data to an inverse attenuation model, identifying an audio processing mode based at least in part on the external audio data and/or the internal audio data, the audio processing mode associated with an audio comparison model, computing energy differential data by applying the comparative internal data and the external audio data to the audio comparison model; and determining a fit result based at least in part on the energy differential data.

Abstract: A forage harvester chopper arrangement is located within a housing provided with an access door mounted for pivoting vertically between a chopping position, wherein access to the chopping arrangement is prevented, and a grinding position, permitting access to the chopping arrangement by a grinding arrangement. A locking arrangement is associated with the access door and an actuator is coupled to the access door and the locking arrangement by a linkage containing lost-motion means which operates such that when moving the access door to its grinding position, the locking arrangement is moved to its unlocked position prior to the access door being raised to its grinding position, and such that when returning the access door to its chopping position, the access door is closed before the locking arrangement is moved to its locked position.

Abstract: A forage harvester chopper arrangement is located within a housing provided with an access door mounted for pivoting vertically between a chopping position, wherein access to the chopping arrangement is prevented, and a grinding position, permitting access to the chopping arrangement by a grinding arrangement. A locking arrangement is associated with the access door and an actuator is coupled to the access door and the locking arrangement by a linkage containing lost-motion means which operates such that when moving the access door to its grinding position, the locking arrangement is moved to its unlocked position prior to the access door being raised to its grinding position, and such that when returning the access door to its chopping position, the access door is closed before the locking arrangement is moved to its locked position.