Manipulation of playback device response using signal processing
First Claim
1. A method of operating a playback device, the method comprising:
- receiving, at the playback device, left and right channels of audio content;
generating a center channel of the audio content, wherein generating the center channel comprises combining at least a portion of the left channel and at least a portion of the right channel;
generating first and second side channels of the audio content,wherein generating the first side channel comprises combining (i) the center channel and (ii) a difference of the left channel and the right channel, andwherein generating the second side channel comprises combining (i) the center channel and (ii) an inverse of the difference of the left channel and the right channel;
playing back the center channel of the audio content according to a first radiation pattern having a maximum aligned with a first direction;
playing back the first side channel according to a second radiation pattern having a maximum aligned with a second direction, wherein the first radiation pattern and the second radiation pattern combine to form a first response lobe having a maximum aligned with a third direction between the first and second directions; and
playing back the second side channel according to a third radiation pattern having a maximum aligned with a fourth direction, wherein the first radiation pattern and the third radiation pattern combine to form a second response lobe having maximum along a fifth direction between the first and fourth directions.
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Accused Products
Abstract
An example playback device receives left and right channels of audio content and generates a center channel of the audio content by combining at least a portion of the left right channels. The playback device generates first and second side channels of the audio content by combining the center channel and a difference of the left channel and the right channel and combining the center channel and an inverse of the difference of the left channel and the right channel, respectively. The playback device plays back the center channel of the audio content according to a first radiation pattern having a maximum aligned with a first direction, the first side channel according to a second radiation pattern having a maximum aligned with a second direction, and the second side channel according to a third radiation pattern having a maximum aligned with a fourth direction.
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Citations
20 Claims
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1. A method of operating a playback device, the method comprising:
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receiving, at the playback device, left and right channels of audio content; generating a center channel of the audio content, wherein generating the center channel comprises combining at least a portion of the left channel and at least a portion of the right channel; generating first and second side channels of the audio content, wherein generating the first side channel comprises combining (i) the center channel and (ii) a difference of the left channel and the right channel, and wherein generating the second side channel comprises combining (i) the center channel and (ii) an inverse of the difference of the left channel and the right channel; playing back the center channel of the audio content according to a first radiation pattern having a maximum aligned with a first direction; playing back the first side channel according to a second radiation pattern having a maximum aligned with a second direction, wherein the first radiation pattern and the second radiation pattern combine to form a first response lobe having a maximum aligned with a third direction between the first and second directions; and playing back the second side channel according to a third radiation pattern having a maximum aligned with a fourth direction, wherein the first radiation pattern and the third radiation pattern combine to form a second response lobe having maximum along a fifth direction between the first and fourth directions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A non-transitory computer-readable medium storing instructions that, when executed by a playback device, cause the playback device to perform operations comprising:
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receiving a left channel of audio content and a right channel of the audio content; generating a center channel of the audio content comprising a combination of the left and right channels; generating first and second side channels of the audio content, wherein generating the first side channel comprises combining (i) the center channel and (ii) a difference between the left channel and the right channel, and wherein generating the second side channel comprises combining (i) the center channel and (ii) an inverse of the difference between the left channel and the right channel; playing back the center channel of the audio content according to a first radiation pattern having a maximum aligned with a first direction; playing back the first side channel according to a second radiation pattern having a maximum aligned with a second direction, wherein the first radiation pattern and the second radiation pattern combine to form a first response lobe having a maximum aligned with a third direction between the first and second directions; and playing back the second side channel according to a third radiation pattern having a maximum aligned with a fourth direction, wherein the first radiation pattern and the third radiation pattern combine to form a second response lobe having maximum along a fifth direction between the first and fourth directions. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A playback device comprising:
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one or more processors; a non-transitory computer-readable medium storing instructions that, when executed by the one or more processors, cause the playback device to perform functions comprising; receiving a center channel of audio content and a side channel of the audio content; generating an inverted side channel comprising an inverse of the received side channel; attenuating a range of audio frequencies of the side channel; amplifying the range of audio frequencies of the center channel; playing back the amplified center channel of the audio content according to a first radiation pattern that having a maximum aligned with a first direction; playing back the attenuated side channel according to a second radiation pattern having a maximum aligned with a second direction, wherein the first radiation pattern and the second radiation pattern combine to form a first response lobe having a maximum aligned with a third direction between the first and second directions; and playing back the inverted side channel according to a third radiation pattern having a maximum aligned with a fourth direction, wherein the first radiation pattern and the third radiation pattern combine to form a second response lobe that has a maximum along a fifth direction between the first and fourth directions.
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Specification