Low-frequency band noise detection
AssigneeInternational Business Machines Corporation
InventorAlexander Sorin
Life of this patent
Estimating the term…
Abstract
A pitch estimation system including a low-frequency band noise detector (LBND) operative to detect the presence of low-frequency band noise in a first audio frame, a frequency-domain pitch estimator operative to calculate a pitch estimation of a second audio frame from at least one spectral peak in the second audio frame, and a pitch estimator controller operative to cause the pitch estimator to exclude from the spectrum of the second audio frame at least one low-frequency spectral peak below a predefined threshold where low-frequency band noise is present in the first audio frame.
Claims24
A pitch estimation system comprising:
- a low-frequency band noise detector (LBND) operative to detect the presence of low-frequency band noise in a first audio frame;
- a frequency-domain pitch estimator operative to calculate a pitch estimation of a second audio frame from at least one spectral peak in said second audio frame;
- and
- a pitch estimator controller operative to cause said pitch estimator to exclude from the spectrum of said second audio frame at least one low-frequency spectral peak located below a predefined frequency threshold where low-frequency band noise is present in said first audio frame.
A pitch estimation method comprising:
- detecting the presence of low-frequency band noise in a first audio frame;
- and
- calculating a pitch estimation of a second audio frame from at least one spectral peak in said second audio frame associated with a frequency above a predefined frequency threshold where low-frequency band noise is present in said first audio frame.
A computer program embodied on a computer-readable medium, the computer program comprising:
- a first code segment operative to detect the presence of low-frequency band noise in a first audio frame;
- and
- a second code segment operative to calculate a pitch estimation of a second audio frame from at least one spectral peak in said second audio frame above a predefined threshold where low-frequency band noise is present in said first audio frame.
Dependencies are inferred from the claim text.