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US 6,675,140 B1Granted
Mellin-transform information extractor for vibration sources
AssigneeSeiko Epson Corporation
InventorsToshio Irino, Roy D. Patterson
Life of this patent
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Abstract
The signal processing method includes the steps of: wavelet-transforming an input signal in a computer; and extracting features of the signal by Mellin-transforming the output of the wavelet transform step in synchrony with the input signal in a computer.
Claims20
A machine-implemented method of signal processing, comprising the steps of:
- receiving an input signal representing a source of vibration;
- wavelet-transformingthe input signal;
- and
- extracting features of said input signal by performing a Mellin transform on the output of said wavelet-transforming step in synchrony with periodicity or pseudo-periodicity of said input signal.
1 more element
A signal processing apparatus comprising:
- wavelet transform means for wavelet-transforming an input signal representing a source of vibration which has been converted to a computer processable predetermined format;
- and
- feature extraction means for extracting signal features by Mellin-transforming the output of said wavelet transform in synchrony with said input signal.
A signal processing apparatus, comprising:
- means for obtaining, in a stabilized time-interval/logarithmic-frequency representation with the origin specified by an input signal representing a source of vibration which has been converted to a computer processable format, a logarithmic time-interval/logarithmic-frequencyrepresentation with the time interval axis being subjected to logarithmic transformation;
- and
- means for transforming said logarithmic time-interval/logarithmic-frequency representation to a new representation having the product of time interval and frequency as the abscissa and logarithmic frequency as the ordinate, and for performing integral transformation on the representation along the ordinate or the abscissa to extract features of the vibration.
A machine-implementedmethod of signal processing, comprising the steps of:
- receiving an input signal representing a source of vibration;
- obtaining, in a stabilized time-interval/logarithmic-frequencyrepresentation with the origin specified by periodicity or pseudo-periodicity of the input signal, a logarithmic time-interval/logarithmic-frequencyrepresentation with time interval axis being subjected to logarithmic transform;
- and
- converting said logarithmic time-interval/logarithmic-frequencyrepresentation to a new representation having the product of time interval and frequency as the abscissa and logarithmic frequency as the ordinate, and performing an integral transform on the representation along the ordinate or abscissa to extract features of the vibration.
1 more element
Dependencies are inferred from the claim text.