Double talk detector, method for double talk detection and device incorporating such a detector
AssigneeNokia Mobile Phones Ltd.
InventorVesa-Pekka Koski
Life of this patent
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Abstract
A double talk detector for detecting double talk situations in a device capable of two-way voice communication. The double talk detector comprises means (2, I) for receiving a speech signal (3, 5; 30, 50), and means (82, 83) for dividing the speech signal (30, 50) into subsignals representing specific frequency bands. A detection is performed (84, 85, 86) for each subsignal, and subdecision signals are calculated (87) on the basis of the detection. The subdecision signals indicate existence of double talk in the respective subsignals. A final decision signal is calculated (89, 90, 91) as a double talk decision signal DTD for the speech signal on the basis of the subdecision signals.
Claims24
A double talk detector for detecting double talk situations in a device capable of two-way voice communication, the double talk detector comprising
- means for receiving a speech signal,
- means for dividing the speech signal into subsignals representing specific frequency bands,
- means for performing a detection for each subsignal, and
- means for calculating subdecision signals on a basis of the detection, the subdecision signal indicating existence of double talk in the respective subsignals, and
- means for calculating a final decision signal as a double talk decision signal for the speech signal a basis of the subdecision signals.
A method for detecting double talk situations in two-way voice communication, the method comprising the steps of
- receiving a speech signal,
- dividing the speech signal into subsignals representing specific frequency bands,
- performing a detection for each subsignal, and
- calculating subdecision signals on a basis of the detection, the subdecision signal indicating existence of double talk in the respective subsignals, and
- calculating a final decision signal as a double talk decision signal for the speech signal on a basis of the subdecision signals.
A device capable of two-way voice communication comprising a double talk detector for detecting double talk, the device comprising
- means for receiving a speech signal,
- means for dividing the speech signal into subsignals representing specific frequency bands,
- means for performing a detection for each subsignal, and
- means for calculating subdecision signals on a basis of the detection, the subdecision signal indicating existence of double talk in the respective subsignals, and
- means for calculating a final decision signal as a double talk decision signal for the speech signal on a basis of the subdecision signals.
Dependencies are inferred from the claim text.