Speech detection system employing multiple determinants
First Claim
1. An apparatus for detecting the presence of speech in a communication signal, comprising:
- an input terminal for receiving the communication signal;
a first filter connected with the input terminal for providing a first statistical signal representing a first statistical value derived from the communication signal;
first comparison means for comparing the first statistical signal with a first reference signal indicative of the presence of speech in the communication signal, and for producing a first determinant signal indicating a result of the comparison;
a second filter connected with the input terminal for providing a second statistical signal representing a second statistical value derived from the communication signal;
second comparison means for comparing the second statistical signal with a second reference signal indicative of the presence of speech in the communication signal, and for producing a second determinant signal indicating a result of the comparison; and
speech decision logic connected for receiving the first and second determinant signals, and configured for combining the first and second determinant signals adding to produce an aggregate determinant signal, for deciding that speech is present in the communication signal on the basis of the aggregate determinant signal, and for providing a logical output signal representing the result of the decision.
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Abstract
A speech detection system is provided with multiple speech detector sub-systems. The speech detection sub-systems employ distinct statistical methods for determining whether speech is present in an electronic communication signal received at an output terminal. For example, a first speech detection sub-system employs moving average peak signal filter, a second speech detection sub-system employing a moving average noise filter, and a third speech detection sub-system employs a variance filter. Signals from each of the filters are compared with respective threshold values, and the threshold values are provided to speech determination logic for making an aggregate speech detection decision. The speech detection system is useful for telephonic automatic gain control.
59 Citations
25 Claims
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1. An apparatus for detecting the presence of speech in a communication signal, comprising:
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an input terminal for receiving the communication signal; a first filter connected with the input terminal for providing a first statistical signal representing a first statistical value derived from the communication signal; first comparison means for comparing the first statistical signal with a first reference signal indicative of the presence of speech in the communication signal, and for producing a first determinant signal indicating a result of the comparison; a second filter connected with the input terminal for providing a second statistical signal representing a second statistical value derived from the communication signal; second comparison means for comparing the second statistical signal with a second reference signal indicative of the presence of speech in the communication signal, and for producing a second determinant signal indicating a result of the comparison; and speech decision logic connected for receiving the first and second determinant signals, and configured for combining the first and second determinant signals adding to produce an aggregate determinant signal, for deciding that speech is present in the communication signal on the basis of the aggregate determinant signal, and for providing a logical output signal representing the result of the decision. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A speech detection system for detecting the presence of speech in a communication signal, comprising:
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an input terminal for receiving the communication signal; a plurality of speech detection modules connected to receive the communication signal, each speech detection module being configured to produce a soft determinant signal indicating a relative presence or absence of speech in the communication signal on the basis of a statistical criterion that is independent relative to the other speech detection modules; speech decision logic for receiving the soft determinant signals, for adding the soft determinant signals to produce an aggregate determinant value, and for making a determination whether the aggregate determinant value is indicative of the presence or absence of speech in the communication signal; and an output terminal for providing a logical control signal on the basis of the determination made by the speech decision logic. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification