Voice activity detector for telephone
AssigneeAcoustic Technologies, Inc.
InventorsSteven M. Domer, Justin L. Allen, Franklyn H. Story, Kellie Michele Vanda
Life of this patent
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Abstract
Voice activity is detected by comparing a signal with two 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.
Claims12
A method for analyzing the energy content of an electrical signal for detecting voice, said method comprising the steps of:
- (a) digitizing the signal;
- (b) defining a first threshold and a second threshold, wherein the first threshold is greater than the second threshold;
- (c) comparing the digitized signal with the first threshold and the second threshold to produce a number representative of the comparison;
- (d) repeating steps (b) and (c) to produce a plurality of numbers;
- (e) converting the plurality of numbers into a first sum;
- and
- (f) comparing the first sum to a third threshold, wherein a sum exceeding the third threshold is indicative of a voice signal.
A method for providing a digital representation of the energy content of an electrical signal, said method comprising the steps of:
- (a) digitizing the signal;
- (b) defining a first threshold and a second threshold, wherein the first threshold is greater than the second threshold;
- (c) comparing the digitized signal with the first threshold and the second threshold to produce a number representative of the comparison;
- (d) repeating steps (b) and (c) to produce a plurality of numbers;
- (e) converting the plurality of numbers into a sum.
Dependencies are inferred from the claim text.