Adapted audio masking

摘要

Ambient sound is masked by receiving an audio signal, monitoring an acoustic signal that includes components of both the ambient sound the audio signal, determining a sound level sufficient to at least partially mask the ambient sound, and reproducing the received audio signal to produce an output acoustic signal at the determined sound level.

主权项

1. A method for masking ambient sound, comprising:
receiving an audio signal; monitoring an acoustic signal that includes components of both the ambient sound and the audio signal; determining a sound level sufficient to at least partially mask the ambient sound by:
passing the monitored acoustic signal through a second band pass filter and a second envelope detector,passing a comparison signal through a first band pass filter and a first envelope detector,comparing outputs of the first and second envelope detectors, andsetting the gain of a variable gain element to control the correlation between the outputs of the first and second envelope detectors; amplifying the received audio signal to a level sufficient to produce an output acoustic signal at the determined sound level; and reproducing the amplified audio signal with an electroacoustic transducer.