Acoustic control apparatus for controlling music information in response to a video signal
AssigneeYamaha Corporation
InventorsMamoru Kimpara, Takeshi Adachi
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Abstract
An acoustic control apparatus which can be applied to an electronic musical instrument controls the acoustics of a musical tone to be generated in response to variation of an image. In order to detect the variation of an image, the acoustic control apparatus extracts a predetermined image element from image information to be given thereto. This image element can be identified as movement of an image, color of image or an outline of image. The color of an image can be detected by detecting hue and/or number of colors in the image. In addition, in response to periodicity in variation of this image element, a performance tempo of musical tone can be controlled.
Claims14
An acoustic control apparatus comprising:
- input means for receiving a video signal representative of a plurality of picture elements;
- element extracting means for extracting picture element level information from said video signal;
- comparison means for comparing said picture element level information with a predetermined threshold value and determining the number of picture elements having a level over said threshold value;
- and
- acoustic control means responsive to said comparison means for giving variation to a music information based on the number of picture elements having a level over said threshold level.
An acoustic control apparatus comprising:
- input means for receiving a video signal representative of a plurality of picture elements in a pictorial image, said video signal including a synchronizing signal having a defined period;
- chroma detecting means for detecting color levels of plural component colors of the picture elements constituting the pictorial image;
- spectrum detecting means for detecting an optical spectrum of image in unit time from the detected color levels of the picture elements, said unit of time being a function of the period of said synchronizing signal;
- and
- control means for giving variation to an acoustic signal or musical tone information in response to said optical spectrum.
An acoustic control apparatus comprising:
- input means for receiving a video signal representative of a pictorial image, said video signal including a synchronizing signal having a defined period;
- chroma detecting means for detecting color levels of plural component colors constituting the pictorial image;
- spectrum detecting means for detecting an optical spectrum of image in unit time from the detected color levels, said unit of time being a function of the period of said synchronizing signal;
- and
- control means for giving variation to an acoustic signal or musical tone information in response to said optical spectrum.
Dependencies are inferred from the claim text.