| CPC G10K 11/17817 (2018.01) [B60N 2/005 (2013.01); B60N 2/90 (2018.02); G10K 11/17815 (2018.01); G10K 11/17823 (2018.01); G10K 11/17825 (2018.01); G10K 11/17881 (2018.01); G10K 2210/1282 (2013.01); G10K 2210/3022 (2013.01); G10K 2210/3026 (2013.01); G10K 2210/3027 (2013.01); G10K 2210/3028 (2013.01); G10K 2210/3044 (2013.01); G10K 2210/3046 (2013.01); G10K 2210/3055 (2013.01); G10K 2210/505 (2013.01)] | 7 Claims |
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1. A communication support system for supporting communication by speech between a user in a first area and a user in a second area, the communication support system comprising:
a sound source apparatus;
a first area speaker that is installed in the first area and that is configured to receive a sound source output sound signal corresponding to sound output from the sound source apparatus;
a second area speaker installed in the second area;
a second area microphone installed in the second area; and
a signal processing apparatus, comprising:
a noise canceling adaptive filter configured to generate a noise canceling sound signal that is applied to the second area speaker,
an audio feedback canceling section configured to generate a second area speech sound signal that is added to the sound source output sound signal and that is applied to the first area speaker, and
a transfer function update processing section,
wherein the noise canceling adaptive filter is configured to generate the noise canceling sound signal by applying a transfer function X(z) adapted by an adaptive operation using a second area sound signal picked up by the second area microphone, as an error, to the sound source output sound signal to generate the noise canceling sound signal,
wherein the audio feedback canceling section includes a first filter, a second filter that is configured to use an output of the first filter as an input, and an adder that that is configured to add the second area sound signal to an output of the second filter and to output a result of the addition as the second area speech sound signal,
wherein the first filter is configured to receive an output of the adder as an input,
wherein the second filter has a transfer function equivalent to a transfer function C(z) from the second area speaker to the second area microphone, and
wherein the transfer function update processing section is configured to update a transfer function of the first filter to a transfer function that is the same as the transfer function X(z) adapted by the adaptive operation performed by the noise canceling adaptive filter.
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