Headphone for active noise suppression

摘要

The disclosed active noise suppression headphone system is directed to a headphone system that is capable of substantially suppressing high or low frequency interfering noise that penetrate through a headphone earpiece from multiple directions. An external microphone mounted with a housing of a headphone earpiece senses ambient noise outside of the earpiece. The sensed ambient noise may be processed through at least one parallel filter bank arranged in at least one headphone earpiece. Each parallel filter bank may include adaptively linked filters. The output of these filters may be amplified based on weighting factors that are dependent upon the sensed ambient noise and that are generated by a filtered x least mean square circuit. The amplified filtered outputs may be summed to generate an antinoise signal that is in input to a loudspeaker within the headphone earpiece that substantial suppresses the ambient noise before it can be perceived by an end user of the headphones.

主权项

1. An active noise suppression headphone apparatus, comprising:
an earpiece having a housing; an external microphone mounted with the housing, the external microphone configured to sense ambient noise outside of the housing; a loudspeaker positioned within the housing; and a parallel filter bank including at least two adaptively linked filters, where an output of each of the at least two adaptively linked filters are coupled to an adder, and where an output of the adder is coupled to the loudspeaker, and an adjustable amplifier bank that includes an adjustable amplifier for each of the at least two adaptively linked filters, and where a corresponding adjustable amplifier is serially positioned between the adaptively linked filters of the parallel filter bank and the adder, and further where each adjustable amplifier is weighted depending on a direction of incidence of the ambient noise sensed by the external microphone.