Signal dependent speech modifications
AssigneeAT&T Corp.
InventorsIoannis G. Stylianou, David A. Kapilow, Juergen Schroeter
Life of this patent
Estimating the term…
Abstract
Speech signals, and similar one-dimensional signals, are time scaled, interpolated, and/or smoothed, when necessary, under influence of a signal that is sensitive to a small window stationarity of the signal that is being modified. Three measures of stationarity are disclosed: one that is based on time domain analysis, one that is based on frequency domain analysis, and one that is based on both time and frequency domain analysis.
Claims25
A method for modifying a one-dimensional input signal comprising the steps of:
- developing a first control signal that is responsive to a preselected characteristic of said input signal, and
- modifying said input signal in accordance with a preselected second control signal and said first control signal, in a relationship that ignores said first control signal when said first control signal is at a first value, and nullifies said second control signals when said first control signal is at a second value.
A method for modifying a one-dimensional input signal comprising the steps of:
- computing a first control signal that is responsive to a preselected characteristic of said input signal, and
- modifying said input signal in accordance with a preselected second control signal and said first control signal, in a relationship that ignores said first control signal when said first control signal is at a first value, and nullifies said second control signal when said first control signal is at a second value.
A method for modifying a one-dimensional input signal comprising the steps of:
- computing a first control signal that is responsive to a stationarity characteristic of said input signal, and
- modifying said input signal in accordance with a preselected second control signal and said first control signal, in a relationship that ignores said first control signal when said first control signal is at a first value, and nullifies said second control signal when said first control signal is at a second value.
A method for modifying a one-dimensional input signal comprising the steps of:
- developing a first control signal that is responsive to a preselected characteristic of said input signal, and
- modifing said input signal by a factor that is related to said first control signal and to a preselected modification factor, where said factor approaches a constant as said first control signal approaches 1, and said factor approaches said preselected modification factor as said first control signal approaches.
Dependencies are inferred from the claim text.