Signal analyzer and method thereof
AssigneeMotorola, Inc.
InventorWeizhong Chen
Life of this patent
Estimating the term…
Abstract
A signal analyzer (303) and method thereof using short-time signal analysis, preferably recursive, to obtain a time variant feature from a signal, the signal analyzer including a signal sampler (401) with an input register (403) for storing a sequence of samples of the signal, a multiplier (405) for weighting in accordance with, alternatively, a half-sine, cosine, 2nd order complex pole, or 3rd order complex pole function the sequence of samples to provide weighted samples of the signal, and a combiner (407) for combining the weighted samples to provide a signal feature estimate, such as a signal average or frequency dependent energy estimate, for the signal.
Claims54
A signal analyzer using short-time signal analysis to obtain a time variant feature from a signal, the signal analyzer comprising in combination:
- an input register for storing a sequence of samples of a portion of said signal,
- a multiplier for weighting in accordance with a half-sine function said sequence of samples to provide weighted samples of said portion of said signal, and
- a combiner for combining said weighted samples to provide a time variant signal feature estimate for said portion of said signal.
A signal analyzer using short-time signal analysis to obtain a time variant feature from a signal, the signal analyzer comprising in combination:
- a signal sampler for sampling the signal to provide a sequence of samples of the signal,
- a multiplier for weighting in accordance with a 2nd order complex pole function said sequence of samples to provide weighted samples, and
- a combiner for combining said weighted samples to provide a time variant signal feature estimate for said signal.
A signal analyzer using short time signal analysis to obtain a time varying feature from a signal, the analyzer comprising in combination:
- an input register for storing a sequence of samples of a portion of the signal,
- a multiplier for weighting in accordance with a cosine-wave function said sequence of samples to provide weighted samples of said portion of said signal, and
- a combiner for combining said weighted samples to provide a time varying signal feature estimate for said portion of said signal.
A signal analyzer using short-time signal analysis to obtain a time variant feature from a signal, the signal analyzer comprising in combination:
- a signal sampler for sampling the signal to provide a sequence of samples of said signal
- a multiplier for weighting in accordance with a 3rd-order complex pole function said sequence of samples to provide weighted samples of said signal, and
- a combiner for combining said weighted samples to provide a time variant signal feature estimate for said weighted samples of said signal.
A signal analyzer using recursive short time signal analysis to obtain a time varying feature from a signal, the analyzer comprising in combination:
- a signal sampler for sampling the signal to provide a sequence of samples of the signal, and
- a combiner for combining a first signal, a second signal, a first previous estimate of the time varying feature, and a second previous estimate of the time varying feature to provide a current time varying feature estimate, said first signal and said second signal, respectively, corresponding to a first sample and a second sample from said sequence of samples of the signal, said second sample spaced by at least one sample from said first sample, said first previous estimate of the time varying feature weighted by a cosine function having an argument inversely proportional to a number of samples equal to a sum of said at least one sample, said first sample and said second sample.
A signal analyzer using recursive short time signal analysis to obtain a time varying feature from a signal, the analyzer comprising in combination:
- a signal sampler for sampling the signal to provide a sequence of samples of the signal,
- a combiner for combining a first signal corresponding to a first sample, a first previous estimate of the time varying feature weighted by a cosine function having an argument inversely proportional to a number of said sequence of samples, and a second previous estimate of the time varying feature exponentially weighted in proportion to said argument to provide a current time varying feature estimate.
In a signal analyzer using recursive short-time signal analysis a method of obtaining a time variant feature from a signal, the method including the steps of:
- storing a sequence of samples of a portion of the signal,
- weighting in accordance with a half-sine function said sequence of samples to provide weighted samples, and
- combining said weighted samples to provide a time variant signal feature for said portion of said signal.
In a signal analyzer using recursive short-time signal analysis, a method of obtaining a time variant feature from a signal, the method including the steps of:
- sampling the signal to provide a sequence of samples of a portion of the signal,
- weighting in accordance with a complex pole function said sequence of samples to provide weighted samples, and
- combining said weighted samples to provide a time variant signal feature for said portion of said signal.
Dependencies are inferred from the claim text.