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US 7,072,310 B2Granted
Echo canceling system
AssigneeFujitsu Limited
InventorNaoshi Matsuo
Life of this patent
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AssigneeFujitsu Limited
InventorNaoshi Matsuo
Estimating the term…
An optimal echo canceling processing is provided regardless of a condition of a partner's system and even in the condition with large delay amount and large fluctuation amplitude of a network transmission. A speaker 10 inputs a voice via a microphone 11. A voice signal of this voice is transmitted to a terminal 14 of a conversation partner via a VoIP application 13 and the internet 30. Concurrently, the voice signal is inputted to an echo canceller 100. The echo canceller 100 detects sound characteristics of an echo path in advance or dynamically, adjusts a filter coefficient for generating an echo canceling signal, and receives an adjustment by a user. The echo canceller 100 generates the echo canceling signal by processing the received voice signal based on the sound characteristics and the adjusting amount. The echo canceling signal is subtracted from a response signal containing an echo that has been re-inputted from a loudspeaker 22 of the partner via a microphone 21.
An echo canceling system for a full-duplex communication system comprising:
The echo canceling system according to claim 3, wherein, in detecting the sound characteristics information of the echo path by the sound characteristics detecting portion, a threshold and a correlation search range with respect to a correlation value between the reference signal in the system on the speaker side and the response signal returned from the conversation partner side can be adjusted.
An echo canceling processing program performing echo canceling processing for a full-duplex communication system, the program comprising program codes of:
An echo canceling processing program readable by a computer for controlling the computer to perform echo canceling processing for a full-duplex communication system, by:
Dependencies are inferred from the claim text.