Audio signal processing

摘要

Systems and methods of processing audio signals are described. The audio signals comprise information about spatial position of a sound source relative to a listener. At least one audio filter generates two filtered signals for each of audio signal. The two filtered signals are mixed with other filtered signals from other audio signals to create a right output audio channel and a left audio output channel, such that the spatial position of the sound source is perceptible from the right and left audio output channels.

主权项

1. A method of applying hearing response function approximations to audio signals to reduce spatial localization processing requirements, the method comprising:
receiving a first audio signal and a second audio signal; filtering the first audio signal with one or more first positional filters, each of the one or more first positional filters configured to approximate a first head-related transfer function (HRTF) by emphasizing first location-relevant portions of the first HRTF by at least applying three or more first component filters to the first audio signal to produce one or more first filtered signals, each of the three or more first component filters configured to contribute to at least a portion of the first location-relevant portions of the first HRTF, the three or more first component filters each selected from the following: a band stop filter, a band pass filter, and a high pass filter; filtering the second audio signal with one or more second positional filters, each of the one or more second positional filters configured to approximate a second head-related transfer function (HRTF) by emphasizing second location-relevant portions of the second HRTF by at least applying three or more second component filters to the second audio signal to produce one or more second filtered signals, each of the three or more second component filters configured to contribute to at least a portion of the second location-relevant portions of the second HRTF, the three or more first component filters each selected from the following: a band stop filter, a band pass filter, and a high pass filter; and combining the one or more first and second filtered signals to produce left and right output signals, such that spatial positions in the left and right output signals are perceptible from left and right speakers.