Method, apparatus and computer program product for providing rhythm information from an audio signal
AssigneeNokia Corporation
InventorsJarno Seppänen, Antti Eronen, Jarmo Hiipakka
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Abstract
An apparatus for providing a beat and tatum tracker includes an accent filter bank, a periodicity estimator, a period estimator and a phase estimator. The accent filter bank is configured to downsample an input audio signal. The periodicity estimator is configured to determine a periodicity based on the downsampled signal. The period estimator is configured to determine a period based on the periodicity. The phase estimator is configured to estimate a phase based on the period for determining beat and tatum times of the input audio signal.
Claims36
A method comprising:
- employing downsampling to preprocess an input audio signal;
- determining a periodicity and period based on the downsampled signal;
- performing, via a processor, a phase estimation based on the period to determine a score comprising an average of filter outputs at intervals defined by the period;
- and
- determining beat information based on the period and the score associated with the phase estimation.
A computer program product comprising at least one computer-readable storage medium having computer-readable program code portions stored therein, the computer-readable program code portions comprising:
- a first executable portion for employing downsampling to preprocess an input audio signal;
- a second executable portion for determining a periodicity and period based on the downsampled signal;
- a third executable portion for performing a phase estimation based on the period to determine a score comprising an average of filter outputs at intervals defined by the period;
- and
- a fourth executable portion for determining beat information based on the period and the score associated with the phase estimation.
An apparatus comprising:
- an accent filter bank configured to downsample an input audio signal;
- a periodicity estimator configured to determine a periodicity based on the downsampled signal;
- a period estimator configured to determine a period based on the periodicity;
- and
- a phase estimator configured to estimate a phase based on the period to determine a score comprising an average of filter outputs at intervals defined by the period for determining beat and tatum times of the input audio signal based on the period and the score associated with the phase estimation.
An apparatus comprising:
- means for employing downsampling to preprocess an input audio signal;
- means for determining a periodicity and period based on the downsampled signal;
- means for performing a phase estimation based on the period to determine a score comprising an average of filter outputs at intervals defined by the period;
- and
- means for determining beat information based on the period and the score associated with the phase estimation.
An apparatus comprising a processor configured to:
- employ downsampling to preprocess an input audio signal;
- determine a periodicity and period based on the downsampled signal;
- perform a phase estimation based on the period to determine a score comprising an average of filter outputs at intervals defined by the period;
- and
- determine beat information based on the period and the score associated with the phase estimation.
Dependencies are inferred from the claim text.