Music – Instruments – Electrical musical tone generation
Reexamination Certificate
2000-08-03
2001-11-27
Witkowski, Stanley J. (Department: 2837)
Music
Instruments
Electrical musical tone generation
C084S668000, C084SDIG001
Reexamination Certificate
active
06323412
ABSTRACT:
FIELD OF THE INVENTION
The present invention pertains to the field of audio signal processing. More particularly, this invention pertains to the field of real time tempo detection of audio signal.
BACKGROUND OF THE INVENTION
Real time tempo detection in a music-playing computer application allows the application to coordinate its display such that the application can respond to the audio input. For example, in response to a musical input, an application can generate three-dimensional (3D) graphical display of dancers dancing to the rhythm of the music. In addition, the application can arrange pulsation of lights in response to the rhythm of the music.
However, prior personal computer systems do not provide real time tempo detection. The major obstacle faced by developers of real-time tempo detection techniques is inefficiency. Due to the large amount of processing required by prior art methods, a personal computer running a prior art tempo detection method in the background cannot run another application, e.g. 3D graphical display, in the foreground at the same time. The central processing unit (CPU) of the computer is “hogged” by the tempo detection algorithm. Reducing the sampling rate of prior tempo detection methods does not solve the problem because it causes the result to be inaccurate and unreliable. Thus, computer applications cannot incorporate prior tempo detection methods to enhance the audio and visual effects. An efficient method for real time tempo detection, without compromising the accuracy, is highly desirable.
SUMMARY OF THE INVENTION
A method and apparatus for real time tempo detection is disclosed. A computer-implemented method for determining tempo in real time, comprising receiving an audio input, dividing the audio input into a plurality of blocks of data, converting each of the plurality of blocks of data from time domain data to frequency domain data, the frequency-domain data comprising amplitude and phase data and stimulating a plurality of resonator banks with the frequency domain data, to cause the resonator banks to generate outputs with various amplitudes. Other features and advantages of the present invention will be apparent from the accompanying drawings and from the detailed description that follows below.
REFERENCES:
patent: 5911170 (1999-06-01), Ding
Blakely , Sokoloff, Taylor & Zafman LLP
Mediadome, Inc.
Witkowski Stanley J.
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