Utilization of filtering effects in stereo headphone devices to enhance spatialization of source around a listener
First Claim
1. An apparatus including a programmable processor or a semi-custom or full-custom dedicated processor, or one or more programmable logic devices, the apparatus comprising:
- (a) a first mixer configured to accept a set of audio inputs and a set of feedback inputs and to form a first predetermined combination of said audio inputs and of said feedback inputs as intermediate output signals, the audio inputs representing audio signals, each audio signal being projected from an idealized sound source located at a respective spatial sound source location relative to a listener location, the set of audio inputs including at least a left audio input and a right audio input;
(b) a filter system configured to filter said intermediate output signals to form filtered intermediate output signals and to filter a second predetermined combination of a plurality of said input signals to produce said feedback inputs, the filter system including one or more filters applied to said intermediate output signal to account for the direct response of a room and one or more filters applied to the second predetermined combination to account for a non-directional approximation to the reverberant response of the room, the filter system including feedback response filtering of said second predetermined combination, such that the filtered intermediate output signals include filtered direct response signals, and filtered reverberant signals that also account for the direct response, wherein said feedback inputs are non-directional; and
(c) a second mixer configured to accept said filtered intermediate output signals and to determine left and right channel stereo outputs for oppositely opposed headphones, the determining being by mixing of said filtered intermediate output signals,such that a listener at the listener location and listening using the oppositely opposed headphones has the sensation of a sound source being spatially distant from the area between said pair of headphones.
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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.
33 Citations
37 Claims
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1. An apparatus including a programmable processor or a semi-custom or full-custom dedicated processor, or one or more programmable logic devices, the apparatus comprising:
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(a) a first mixer configured to accept a set of audio inputs and a set of feedback inputs and to form a first predetermined combination of said audio inputs and of said feedback inputs as intermediate output signals, the audio inputs representing audio signals, each audio signal being projected from an idealized sound source located at a respective spatial sound source location relative to a listener location, the set of audio inputs including at least a left audio input and a right audio input; (b) a filter system configured to filter said intermediate output signals to form filtered intermediate output signals and to filter a second predetermined combination of a plurality of said input signals to produce said feedback inputs, the filter system including one or more filters applied to said intermediate output signal to account for the direct response of a room and one or more filters applied to the second predetermined combination to account for a non-directional approximation to the reverberant response of the room, the filter system including feedback response filtering of said second predetermined combination, such that the filtered intermediate output signals include filtered direct response signals, and filtered reverberant signals that also account for the direct response, wherein said feedback inputs are non-directional; and (c) a second mixer configured to accept said filtered intermediate output signals and to determine left and right channel stereo outputs for oppositely opposed headphones, the determining being by mixing of said filtered intermediate output signals, such that a listener at the listener location and listening using the oppositely opposed headphones has the sensation of a sound source being spatially distant from the area between said pair of headphones. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of operating a signal processing apparatus, the method comprising:
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(a) accepting a set of audio inputs representing audio signals, each audio signal being projected from an idealized sound source located at a respective spatial sound source location relative to a listener location, the set of audio inputs including at least a left audio input and a right audio input; (b) determining by mixing said audio inputs and a set of feedback inputs, the determining by mixing forming a first predetermined combination of said audio inputs and of said feedback inputs as intermediate output signals; (c) filtering said intermediate output signals to form filtered intermediate output signals, the filtering using one or more filters to account for the direct response of a room; (d) filtering a second predetermined combination of a plurality of said input signals to produce said feedback inputs to account for a non-directional approximation to the reverberant response of the room, such that the filtered intermediate output signals include filtered direct response signals, and filtered reverberant signals that also account for the direct response, wherein said feedback inputs are non-directional; and (e) determining left and right channel stereo outputs for oppositely opposed headphones, the determining being by mixing of said filtered intermediate output signals such that a listener at the listener location and listening using the oppositely opposed headphones has the sensation of a sound source being spatially distant from the area between said pair of headphones. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. An apparatus comprising:
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a programmable processor or a semi-custom or full-custom dedicated processor, or at least one programmable logic device, wherein the programmable processor, dedicated processor, or at least one programmable logic device is configured to; (a) accept a set of audio inputs representing audio signals, each audio signal being projected from an idealized sound source located at a respective spatial sound source location relative to a listener location, the set of audio inputs including at least a left audio input and a right audio input; (b) mix said audio inputs and a set of feedback inputs, the mixing forming a first predetermined combination of said audio inputs and of said feedback inputs as intermediate output signals; (c) filter said intermediate output signals to form filtered intermediate output signals, the filtering using one or more filters to account for the direct response of a room; (d) filter a second predetermined combination of a plurality of said input signals to produce said feedback inputs to account for a non-directional approximation to the reverberant response of the room such that the filtered intermediate output signals include filtered direct response signals, and filtered reverberant signals that also account for the direct response, wherein said feedback inputs are non-directional; and (e) determine left and right channel stereo outputs for oppositely opposed headphones, the determining being by mixing of said filtered intermediate output signals such that a listener at the listener location and listening using the oppositely opposed headphones has the sensation of a sound source being spatially distant from the area between said pair of headphones. - View Dependent Claims (33, 34, 35, 36, 37)
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Specification