| 摘要 |
Provided is a communication device which can easily provide a function to enable signal cross-reference among a plurality of voice signals having different frequency ranges and to enhance the quality of voice communications, at a low cost. In the communication device, a band expansion unit (104) expands a narrow band voice signal to a broad frequency range voice signal; a gain control unit (105) controls a gain of a downstream voice signal using an upstream voice signal as a reference signal; an echo canceler (109) cancels an echo component contained in the upstream voice signal using the downstream voice signal as a reference signal; a down-sampling unit (111) generates a narrow band reference signal by performing a band conversion to convert a broad band voice signal to a narrow band voice signal; and an up-sampling unit (112) generates a broadband reference signal by performing band conversion to convert a narrow band voice signal to a broadband voice signal. |
