Voice activity detector for telephone
First Claim
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1. 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 count and a second count, wherein the first count is greater than the second count;
(c) comparing the digitized signal with the first count and the second count 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 count, wherein a sum exceeding the third count is indicative of a voice signal.
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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.
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Citations
12 Claims
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1. A method for analyzing the energy content of an electrical signal for detecting voice, said method comprising the steps of:
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(a) digitizing the signal; (b) defining a first count and a second count, wherein the first count is greater than the second count; (c) comparing the digitized signal with the first count and the second count 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 count, wherein a sum exceeding the third count is indicative of a voice signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for providing a digital representation of the energy content of an electrical signal, said method comprising the steps of:
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(a) digitizing the signal; (b) defining a first count and a second count, wherein the first count is greater than the second count; (c) comparing the digitized signal with the first count and the second count 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. - View Dependent Claims (11, 12)
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Specification