Apparatus and method for discriminating between voice and data by using a frequency estimate representing both a central frequency and an energy of an input signal

摘要

The present invention classifies an input signal as either voice or data with reduced energy consumption. The present invention includes a frequency estimator and an energy estimator for processing an input signal and a classification unit connected to both the frequency and energy estimators for classifying the input signal. The frequency estimator includes a delay and difference integrator. In operation, the delay receives the input signal and generates a delayed input signal and the difference integrator receives the delayed and input signals and generates a frequency estimate value representing both the estimated central frequency of the input signal and the estimated energy of the input signal. The energy estimator generates an estimate of the energy level of the input signal. The classification unit classifies the input as either voice or data based on a comparison of the frequency and energy estimate values and a data threshold value.