Linear-matrix audio-imaging system and image analyzer
First Claim
1. An audio-imaging system comprising:
- first and second input channels for receiving first and second channel audio input signals;
first, second, and third output channels for producing first, second, and third audio output signals as a function of signals applied to said first and second input channels;
wherein said signal on said first, second, and third output channels are respectively a function of L-MR, R-Ml and (1-M)(L+R) where;
L;
is the level of said signal applied to said first input,R;
is the level of said signal applied to said second input, andM;
is the value said parameter and said parameter is nonzero anda circuit that produces signals on each of said first, second, and third output channels as a function of a combination of said signals applied to said first and second input channels and said parameter, said parameter being common to said first, second, and third output signals, said parameter being adjustable by one of a user adjustment and an automatic adjustment in order to vary the width of the audio image produced by said signals to compensate for composition mixing of a program source applied to said input channels.
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Abstract
An audio-imaging system includes at least first and second input channels for receiving first and second channel audio input signals and at least first, second and third output signals which are produced as a combination of the first and second channel audio input signals and a nonzero parameter. The parameter is common to the first, second and third output signals and may be made adjustable in order to vary the width of the audio image produced in order to compensate for composition mixing of a program source applied to the input channels. A sound-image analyzer is also provided which processes a program source applied to the input channels to at least three fully separated levels representing left, right and center directions of the program source in order to determine a value of the parameter.
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Citations
38 Claims
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1. An audio-imaging system comprising:
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first and second input channels for receiving first and second channel audio input signals; first, second, and third output channels for producing first, second, and third audio output signals as a function of signals applied to said first and second input channels;
wherein said signal on said first, second, and third output channels are respectively a function of L-MR, R-Ml and (1-M)(L+R) where;L;
is the level of said signal applied to said first input,R;
is the level of said signal applied to said second input, andM;
is the value said parameter and said parameter is nonzero anda circuit that produces signals on each of said first, second, and third output channels as a function of a combination of said signals applied to said first and second input channels and said parameter, said parameter being common to said first, second, and third output signals, said parameter being adjustable by one of a user adjustment and an automatic adjustment in order to vary the width of the audio image produced by said signals to compensate for composition mixing of a program source applied to said input channels. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A audio-imaging system comprising:
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first and second input channels for receiving first and second channel audio input signals; first, second, and third output channels for producing first, second, and third audio output signals as a function of signals applied to said first and second input channels; and a circuit that produces a signal on said first output channel as a function of L-MR, a signal on said second output channel as a function of R-ML, and a signal on said third output channel as a function of (1-M)(L+R), wherein L is the level of said signal applied to said first input, R is the level of said signal applied to said second input, and M is a nonzero parameter. - View Dependent Claims (8, 9, 10)
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11. An audio-imaging system comprising:
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first, second, and third input channels for receiving first, second, and third channel audio input signals; first, second, third, fourth, and fifth output channels for producing first, second, third, fourth, and fifth audio output signals as a function of signals applied to said first, second, and third input channels; and a circuit that produces a signal on said first output channel as a function of L-MC, a signal on said second output channel as a function of (1-M)(L+C), a signal on said third output channel as a function of C-M(R+L), a signal on said fourth output channel as a function of (1-M)(R+C), and a signal on said fifth output channel as a function of R-MC, wherein L is the level of said signal applied to said first input channel, R is the level of said signal applied to said second input channel, C is the level of said signal applied to said third input channel, and M is a nonzero parameter. - View Dependent Claims (12, 13, 14)
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15. An audio-imaging system comprising:
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first, second, third, and fourth input channels for receiving first, second, third, and fourth channel audio input signals; first, second, third, fourth, fifth, sixth, seventh, and eighth output channels for producing first, second, third, fourth, fifth, sixth, seventh, and eighth audio output signals as a function of signals applied to said first, second, third, and fourth inputs; and a circuit that produces a signal on said first output channel as a function of A-M(B+D), a signal on said second output channel as a function of (1-M)(A+B), a signal on said third output as a function of B-M(A+C), a signal on said fourth output channel as a function of (1-M)(B+C), a signal on said fifth output channel as a function of C-M(B+C), a signal on said sixth output channel as a function of (1-M)(C+D), a signal on said seventh output channel as a function of D-M(A+C), and a signal on said eighth output channel as a function of (1-M)(A+D), wherein A, B, C, and D are the levels of said signals applied, respectively, to said first, second, third, and fourth input channels and M is a nonzero parameter. - View Dependent Claims (16, 17, 18)
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19. An audio-imaging system comprising:
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first, second, third, and fourth input channels for receiving first, second, third, and fourth channel audio input signals; first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth output channels for producing first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth audio output signals as a function of signals applied to said first, second, third, and fourth input channels; and a circuit that produces a signal on said first output channel as a function of A-M(B+D), a signal on said second output channel as a function of (1-M)(A+B)-M(1-M)(C+D), a signal on said third output channel as a function of (1-M)(C+D)-M(1-M)(A+B), a signal on said fourth output channel as a function of B-M(A+C), a signal on said fifth output channel as a function of C-M(B+D), a signal on said sixth output channel as a function (1-M)(B+C)-M(1-M)(A+D), a signal on said seventh output channel as a function of (1-M)(1-M)(A+B+C+D), a signal on said eighth output channel as a function of (1-M)(A+D)-M(1-M)(B+C) and a signal on said ninth output channel as a function of D-M(A+C), wherein A, B, C, and D are the levels of said signals applied respectively to said first, second, third, and fourth inputs and M is a nonzero parameter. - View Dependent Claims (20, 21, 22, 23)
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24. An audio-imaging system comprising:
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first and second input channels for receiving left and right channel audio input signals of a stereophonic system; first, second, and third output channels for producing left, right and center audio output signals; a circuit that produces signals on each of said first, second, and third output channel as a function of a combination of said signals applied to said first and second input channels and a parameter, said parameter being common to said first, second, and third output signals; and a sound-image analyzer which processes a program source applied to said input channels to at least three fully separated levels representing left, right and center directions, respectively, of said program source, said left, right and center directions representing an image of the program source, wherein said image analyzer determines a value of said parameter as a function of said left, right and center directions, wherein said parameter of said circuit can be adjusted in response to the image of said program source. - View Dependent Claims (25, 26, 27, 28)
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29. An audio-image analyzer comprising:
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first and second input channels for receiving left and right channel audio input signals of a stereophonic system; a circuit which processes a program source applied to said first and second input channels to at least three fully separated levels representing left, right and center directions, respectively, or said program source, wherein said circuit determines;
space="preserve" listing-type="equation">Ld=X*(Avg(|L|-|R|+|L-R.vertline.)),
space="preserve" listing-type="equation">Rd=X*(Avg(|R|-|L|+|L-R.vertline.)),
space="preserve" listing-type="equation">Cd=Y(Avg(|L+R|+|L|+|R.vertline.-2|L-R|)),where; R is the program source left channel signal, L is the program source right channel signal, Ld is said left direction, Rd is said right direction, Cd is said same direction, X is a first scaling factor, and Y is a second scaling factor. - View Dependent Claims (30, 31, 32)
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31. The image analyzer in claim 30 further including means for determining:
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space="preserve" listing-type="equation">Sd=Z*(Avg(2*|L-R|-|L|-|R.vertline.))where Sd is an ambient audio level determined by the analyzer, and Z is a number.
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32. The image analyzer in claim 29, including a display for said levels.
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33. A method of imaging a multiple-channel audio program including:
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receiving first and second channel audio input signals; producing first, second, and third audio output signals as a combination of said first and second audio signals and a nonzero parameter, said parameter being common to said first, second and third output signals;
wherein said signal on said first, second, and third outputs are, respectively, a function of L-MR, R-ML and (1-M)(L+R) where;L;
is the level of said first audio signal,R;
is the level of said second audio signal, andM;
is the value of said parameter; andadjusting said parameter by one of a user adjustment and an automatic adjustment in order to vary the width of the audio image produced by said first and second channel audio input signals to compensate for composition mixing of a program source making up said audio input signals. - View Dependent Claims (34, 35, 36, 37, 38)
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Specification