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US 2003/0193366 A1Published application
Demodulating
AssigneeBose Corporation
InventorTobe Barksdale
Life of this patent
Estimating the term…
Abstract
Demodulation apparatus includes a transversal filter characterized by coefficients adjusted by a coefficient determiner responsive to a constant modulus error signal and variable mode error signal related to the output of a spectral mean frequency detector having its input coupled to the output of the transversal filter.
Claims6
Demodulation apparatus comprising,
- a transversal filter characterized by coefficients, having a signal input for receiving a signal carrying modulation, a coefficient input for receiving coefficient signals and an output,
- a coefficient determiner having an input coupled to the signal input of said transversal filter and an output coupled to the coefficient input of said transversal filter constructed and arranged to furnish coefficient signals representative of said coefficients and having a constant modulus error input that receives a constant modulus error estimate signal and a variable mode error input that receives a variable mode error estimate signal,
- a constant modulus error estimator having an input coupled to the output of said transversal filter and an output coupled to said constant modulus error input,
- a variable mode error estimator having an input coupled to the output of said transversal filter, a control input and an output coupled to said variable mode error input,
- a spectral mean frequency detector having an input coupled to the output of said transversal filter and an output, and
- a variable mode controller having an input coupled to the output of said spectral mean frequency detector and an output coupled to the control input of said variable mode error estimator.
3 more elements
Each and every feature and novel combination of features present in or possessed by the apparatus and techniques herein disclosed.
Dependencies are inferred from the claim text.