echo n. (pl. echoes) 1.回声,反响;共鸣,反映。 2.重复,摹仿;摹仿者;应声虫。 3.【音韵学】与上句末音押韵的诗句。 4.〔E-〕 【希腊神话】山林的女神。 5.(雷达的)回波,反射波。 find an echo in sb.'s heart 得人共鸣。 to the echo 大声,高声 (applaud [cheer] to the echo 大声喝彩)。 vt. 1.使反响。 2.模仿,重复。 3.反射(声音等)响。 echo sb.'s words 随声附和。 vi. 1.发出回声,共鸣 (with)。 2.重复。 3.(桥牌战中)打出报信牌。
Signal processing for acoustic echo control includes modeling of reverberation , design of dereverberation algorithms , echo suppression , double - talk detection and adaptive acoustic echo cancellation , which is still a challenging problem in stereo full - duplex communication environments [ 3 . 53 ] 声学回声控制的信号处理包括回响模型、消回响算法设计、回声抑制、双方讲话检测以及适应回声消除,这仍然是立体声全双工通信环境中富有挑战性的问题。
Hands - free speech communication is indispensable in audio and video conference systems , hot - line telephones and videophones , mobile radio terminals , digital isdn network etc . however , the control ( cancellation ) of the acoustic echo has always had a strong impact on the transmission quality in hands - free telecommunication ~ [ 1 - 3 ] conventional methods of acoustic echo control ( cancellation ) , such as echo suppression or gain control , may lead to the degradations in speech quality or make the speakers feel uncomfortable 免提式话音通信在移动电话、热线电话、车载电话及isdn网的电视电话会议等多种领域正得到日益广泛的应用。但至今的免提式话音通信中,仍免不了受回声引起的话音失真、甚至啸叫等干扰,大大降低了免提话音通信的质量。由于声回波对消问题尚未得到圆满解决,实现高质量的免提式话音通信仍是一个极赋挑战性的课题。