echo n. (pl. echoes) 1.回聲,反響;共鳴,反映。 2.重復(fù),摹仿;摹仿者;應(yīng)聲蟲。 3.【音韻學(xué)】與上句末音押韻的詩句。 4.〔E-〕 【希臘神話】山林的女神。 5.(雷達(dá)的)回波,反射波。 find an echo in sb.'s heart 得人共鳴。 to the echo 大聲,高聲 (applaud [cheer] to the echo 大聲喝彩)。 vt. 1.使反響。 2.模仿,重復(fù)。 3.反射(聲音等)響。 echo sb.'s words 隨聲附和。 vi. 1.發(fā)出回聲,共鳴 (with)。 2.重復(fù)。 3.(橋牌戰(zhàn)中)打出報(bào)信牌。
Acoustic processing and echo control sound pickup and playback is an important area of multimedia processing 聲學(xué)處理和回聲控制拾音和重放是多媒體處理的一個(gè)重要領(lǐng)域。
The primary advances in speech and audio signal processing that contributed to multimedia applications are in the areas of speech and audio signal compression , speech synthesis , acoustic processing , echo control and network echo cancellation 語音和音頻信號(hào)處理的改進(jìn)對(duì)多媒體應(yīng)用的貢獻(xiàn)在下述范圍:語音和音頻信號(hào)壓縮、語音合成、聲學(xué)處理、回聲控制以及網(wǎng)絡(luò)回聲消除。
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 ] 聲學(xué)回聲控制的信號(hào)處理包括回響模型、消回響算法設(shè)計(jì)、回聲抑制、雙方講話檢測(cè)以及適應(yīng)回聲消除,這仍然是立體聲全雙工通信環(huán)境中富有挑戰(zhàn)性的問題。
The idea of acoustic signal processing and echo control is to allow straightforward high - quality sound pickup and playback in applications , such as a duplex device like a speakerphone , a sound source - tracking apparatus like microphone arrays , teleconferencing systems with stereo input and output , hands - free cellular phones and home theatre with 3d sound 聲學(xué)信號(hào)處理和回聲控制是想在應(yīng)用中能夠獲得高質(zhì)量的拾音和重放,這些應(yīng)用包括耳麥之類的雙工設(shè)備、麥克風(fēng)陣列之類的聲源跟蹤設(shè)備、立體聲輸入輸出的遠(yuǎn)程會(huì)議系統(tǒng)、不用手的蜂窩電話以及3d聲音的家庭影院等。
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 免提式話音通信在移動(dòng)電話、熱線電話、車載電話及isdn網(wǎng)的電視電話會(huì)議等多種領(lǐng)域正得到日益廣泛的應(yīng)用。但至今的免提式話音通信中,仍免不了受回聲引起的話音失真、甚至嘯叫等干擾,大大降低了免提話音通信的質(zhì)量。由于聲回波對(duì)消問題尚未得到圓滿解決,實(shí)現(xiàn)高質(zhì)量的免提式話音通信仍是一個(gè)極賦挑戰(zhàn)性的課題。