Google Inc.

Mans Gustaf Sebastian Ullberg

Alessio Bazzica

Marcus Wirebrand

Alexandre Loiko

Samuel Martin Zackrisson

Daniel Johansson

Ivo Creusen

Iva Creusen

A method includes receiving a microphone audio signal and a playout audio signal, and determining a frequency representation of the microphone audio signal and a frequency representation of the playout audio signal. For each frequency representation, the method also includes determining features based on the frequency representation. Each feature corresponds to a pair of frequencies of the frequency representation and a period of time between the pair of frequencies. The method also includes determining that a match occurs between a first feature based on the frequency representation of the microphone audio signal and a second feature based on the frequency representation of the playout audio signal, and determining that a delay value between the first feature and the second feature corresponds to an echo within the microphone audio signal.

Echo detection

A method () includes receiving a microphone audio signal () and a playout audio signal (), and determining a frequency representation () of the microphone audio signal and a frequency representation of the playout audio signal. For each frequency representation, the method also includes determining features () based on the frequency representation. Each feature corresponds to a pair of frequencies () of the frequency representation and a period of time between the pair of frequencies. The method also includes determining that a match () occurs between a first feature based on the frequency representation of the microphone audio signal and a second feature based on the frequency representation of the playout audio signal, and determining that a delay value () between the first feature and the second feature corresponds to an echo within the microphone audio signal.

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Mans Gustaf Sebastian Ullberg