Method and apparatus for two channels of sound having directional cues
First Claim
1. A method for generating two channels of sound signals from a multiplicity of sound signals, said multiplicity of sound signals comprising a first plurality of front signals and second plurality of rear signals, said method comprising the steps of:
- applying a 90°
phase shift to the second plurality of rear sound signals;
applying head related transfer functions to the phase shifted second plurality of rear sound signals to generate modified rear sound signals, said modified rear signals comprising signals identified as corresponding to the first channel and signals corresponding to the second channel;
said front signals comprising signals identified as corresponding to the first channel and signals corresponding to the second channel;
combining the signals corresponding to the first channel to generate a first combined signal, the modified rear signals corresponding to the first channel being subtracted from the remaining signals corresponding to the first channel; and
combining the signals corresponding to the second channel togenerate a second combined signal.
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Accused Products
Abstract
The system and method of the present invention provides enhanced surround sound effects. In one embodiment, 90° phase shift and copy of the modified head related transfer functions (HRTF) are applied to each rear sound signal. The modified HRTF for each rear signal is generated by removing the head related transfer function corresponding to the front center signal from the HRTF corresponding to the rear sound signal. This provides the audible effect of distinguishing more clearly sounds originating in front of the listener or to the rear of the listener while not limiting the perceived bandwidth of the signal. The rear signals corresponding to the first channel are inverted. The front and rear signals for each corresponding channel are then combined. The two channels, generated can be stored on media, such as film, and subsequently read and input to a surround sound decoder to generate enhanced surround sound output.
51 Citations
27 Claims
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1. A method for generating two channels of sound signals from a multiplicity of sound signals, said multiplicity of sound signals comprising a first plurality of front signals and second plurality of rear signals, said method comprising the steps of:
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applying a 90°
phase shift to the second plurality of rear sound signals;applying head related transfer functions to the phase shifted second plurality of rear sound signals to generate modified rear sound signals, said modified rear signals comprising signals identified as corresponding to the first channel and signals corresponding to the second channel; said front signals comprising signals identified as corresponding to the first channel and signals corresponding to the second channel; combining the signals corresponding to the first channel to generate a first combined signal, the modified rear signals corresponding to the first channel being subtracted from the remaining signals corresponding to the first channel; and combining the signals corresponding to the second channel to generate a second combined signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for generating two channels of sound signals from a multiplicity of sound signals, said multiplicity of sound signals comprising a first plurality of front signals and second plurality of rear signal, said method comprising the steps of:
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applying a 90 degree phase shift to the second plurality of rear sound signals to generate phase shifted rear sound signals; applying head related transfer functions to the phase shifted rear sound signals to generate modified rear sound signals, said modified rear signals comprising signals identified as corresponding to the first channel and signals corresponding to the second channel; selectively inverting modified rear signals such the modified rear signals corresponding to the first channel are inverted; said front signals comprising signals identified as corresponding to the first channel and signals corresponding to the second channel; combining the signals corresponding to the first channel to generate a first combined signal; and combining the signals corresponding to the second channel to generate a second combined signal. - View Dependent Claims (15, 16, 17, 18, 19)
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20. An apparatus for generating two channels of sound signals from a multiplicity of sound signals, said multiplicity of sound signals comprising a first plurality of front signals and second plurality of rear signals, said apparatus comprising of:
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a plurality of inputs for receiving a plurality of sound signals; a processing device for receiving a plurality of sound signals, said processing device, applying a 90°
phase shift to the second plurality of rear sound signals, applying head related transfer functions to the second phase shifted plurality of rear sound signals to generate modified rear sound signals, said front signals comprising signals identified as corresponding to a first channel and signals corresponding to the second channel, said modified rear sound signals comprising signals identified as corresponding to a first channel and signals corresponding to a second channel, combining the signals corresponding to the first channel to generate a first combined signal, the modified rear signals being subtracted form the remaining signals corresponding to the first channel, and combining the signals corresponding to the second channel to generate a second combined signal. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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Specification