UTILIZATION OF FILTERING EFFECTS IN STEREO HEADPHONE DEVICES TO ENHANCE SPATIALIZATION OF SOURCE AROUND A LISTENER
First Claim
1. An apparatus for creating, utilizing a pair of oppositely opposed headphones, the sensation of a sound source being spatially distant from the area between said pair of headphones, said apparatus comprising:
- (a) a series of audio input terminals to accept a series of audio inputs representing audio signals each being projected from an idealized sound source located at a respective spatial location relative to an idealized listener, the series of audio inputs including at least a left audio input and a right audio input;
(b) a first mixing matrix means interconnected to said audio inputs and a series of feedback inputs for outputting a predetermined combination of said audio inputs as intermediate output signals;
(c) a filter system for filtering said intermediate output signals and outputting filtered intermediate output signals and said series of feedback inputs, said filter system including one or more filters to account for the direct response of a room and one or more filters to account for an approximation to the reverberant response of the room, the filter system including feedback response filtering for producing said feedback inputs, such that the filtered intermediate output signals include filtered direct response signals and filtered reverberant signals; and
(d) a second matrix mixing means combining said filtered intermediate output signals to produce left and right channel stereo outputs.
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Abstract
An apparatus for creating, utilizing a pair of oppositely opposed headphone speakers, the sensation of a sound source being spatially distant from the area between the pair of headphones, the apparatus comprising: (a) a series of audio inputs representing audio signals being projected from an idealised sound source located at a spatial location relative to the idealised listener; (b) a first mixing matrix means interconnected to the audio inputs and a series of feedback inputs for outputting a predetermined combination of the audio inputs as intermediate output signals; (c) a filter system of filtering the intermediate output signals and outputting filtered intermediate output signals and the series of feedback inputs, the filter system including separate filters for filtering the direct response and short time response and an approximation to the reverberant response, in addition to the feedback response filtering for producing the feedback inputs; and (d) a second matrix mixing means combining the filtered intermediate output signals to produce left and right channel stereo outputs.
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Citations
12 Claims
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1. An apparatus for creating, utilizing a pair of oppositely opposed headphones, the sensation of a sound source being spatially distant from the area between said pair of headphones, said apparatus comprising:
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(a) a series of audio input terminals to accept a series of audio inputs representing audio signals each being projected from an idealized sound source located at a respective spatial location relative to an idealized listener, the series of audio inputs including at least a left audio input and a right audio input;
(b) a first mixing matrix means interconnected to said audio inputs and a series of feedback inputs for outputting a predetermined combination of said audio inputs as intermediate output signals;
(c) a filter system for filtering said intermediate output signals and outputting filtered intermediate output signals and said series of feedback inputs, said filter system including one or more filters to account for the direct response of a room and one or more filters to account for an approximation to the reverberant response of the room, the filter system including feedback response filtering for producing said feedback inputs, such that the filtered intermediate output signals include filtered direct response signals and filtered reverberant signals; and
(d) a second matrix mixing means combining said filtered intermediate output signals to produce left and right channel stereo outputs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification