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AssigneeNTT Mobile Communications Network, Inc.
InventorsToshiro Kawahara, Toshio Miki, Hirohito Suda, Tomoyuki Ohya, Hirofumi Takagi
Estimating the term…
The present invention relates to an echo canceler for training an echo path estimation without providing a hindrance to a speech. The echo canceler of the present invention includes a pseudo noise generator for generating a certain pseudo noise. This pseudo noise is forcibly supplied to a transmission line for transmitting a far-end talker's voice. Here, in the case where the far-end talker's transmitting speech level is faint or the far-end talker is in a speechless condition, a certain correlation is established between the pseudo noise and a signal of the transmission line for transmitting the near-end talker's voice. Based on such a correlation as just mentioned, a coefficient for generating an echo replica is calculated. Therefore, a training for estimating an echo path is performed based on the pseudo noise and without depending on the far-end talker's voice, thereby enabling to generate an appropriate echo replica.
An echo canceler employed in a communication line network including a first transmission line for transmitting a voice of a four-wire side and a second transmission line for transmitting a voice of a second-wire side, said echo canceler comprising:
An echo canceler employed in a communication line network for performing a transmission between a voice transmitted through a four-wire side and a voice transmitted through a two-wire side, said echo canceler comprising:
An echo path estimating method applicable to an echo canceler employed in a communication line network including a first transmission line for transmitting a voice of a four-wire side and a second transmission line for transmitting a voice of a second-wire side, said echo pass estimating method comprising:
An echo path estimating method for estimating an echo path with respect to a communication line network for performing a transmission between a voice transmitted through a four-wire side and a voice transmitted through a two-wire side, said method comprising the steps of:
An echo canceler employed in a communication line network including a first transmission line for transmitting a voice of a four-wire side and a second transmission line for transmitting a voice of a second-wire side, said echo canceler comprising:
An echo canceler employed in a communication line network for performing a transmission between a voice transmitted through a four-wire side and a voice transmitted through a two-wire side, said echo canceler comprising:
An echo path estimating method applicable to an echo canceler employed in a communication line network including a first transmission line for transmitting a voice of a four-wire side and a second transmission line for transmitting a voice of a second-wire side, said echo pass estimating method comprising:
An echo path estimating method for estimating an echo path with respect to a communication line network for performing a transmission between a voice transmitted through a four-wire side and a voice transmitted through a two-wire side, said method comprising the steps of:
An echo canceler employed in a communication line network including a first transmission line for transmitting a voice of a four-wire side and a second transmission line for transmitting a voice of a second-wire side, said echo canceler comprising:
An echo canceler employed in a communication line network for performing a transmission between a voice transmitted through a four-wire side and a voice transmitted through a two-wire side, said echo canceler comprising:
Dependencies are inferred from the claim text.