Analog voice activity detector for telephone
AssigneeAcoustic Technologies, Inc.
InventorsJustin L. Allen, Steven M. Domer
Life of this patent
Estimating the term…
Abstract
Voice activity is detected by comparing an analog signal with two voltage thresholds and producing data representing the energy of the signal. The data, in binary form, is compared with thresholds to determine voice activity. In accordance with another aspect of the invention, the thresholds are adjusted based upon statistical information. In accordance with another aspect of the invention, the data can be weighted to provide an indication of the quasi-RMS energy of an input signal. The input signal itself is not converted into digital form yet the data derived from the input signal has high resolution.
Claims10
A method for analyzing the energy content of an electrical signal for detecting voice, said method comprising the steps of:
- (a) defining a first voltage threshold and a second voltage threshold, wherein the first threshold is greater than the second threshold;
- (b) comparing the signal with the first voltage threshold and the second voltage threshold to produce a digital number representative of the signal;
- (c) repeating steps (a) and (b) to produce a plurality of numbers;
- (d) converting the plurality of numbers into a first sum;
- and
- (e) comparing the first sum to a third threshold, wherein a sum exceeding the third threshold is indicative of a voice signal.
A method for analyzing the energy content of an electrical signal, said method comprising the steps of:
- (a) defining a first voltage threshold and a second voltage threshold, wherein the first threshold is greater than the second threshold;
- (b) comparing the signal with the first voltage threshold and the second voltage threshold to produce a digital number representative of the signal;
- (c) repeating steps (a) and (b) to produce a plurality of numbers;
- (d) converting the plurality of numbers into a sum.
Dependencies are inferred from the claim text.