signal n. 1.信號(hào),暗號(hào);信號(hào)器。 2.動(dòng)機(jī),導(dǎo)火線 (for)。 3.預(yù)兆,征象。 call signal 【無(wú)線電】呼號(hào)。 an alarm signal 警報(bào)(器)。 an information signal 〔美國(guó)〕暴風(fēng)警報(bào)(旗)。 an international code of signals 國(guó)際通用信號(hào)。 a signal of distress =a distress signal 船只失事信號(hào)。 adj. 1.暗號(hào)的,作信號(hào)用的。 2.顯著的,非常的,優(yōu)越的。 a signal victory [defeat] 大勝[敗]。 vt.,vi. (〔英國(guó)〕 -ll-) 發(fā)信號(hào)[警報(bào)]給(人、船等);用信號(hào)[警報(bào)]通知(暴風(fēng)、危險(xiǎn)等);用動(dòng)作[手勢(shì)]示意;預(yù)示。 a signaling bomb 信號(hào)彈。
A functional unit that modulates and demodulates signals . one of the functions of a modem is to enable digital data to be transmitted over analog transmission facilities 一種對(duì)信號(hào)進(jìn)行調(diào)制與解調(diào)的功能部件,調(diào)制解調(diào)器的功能之一就是使數(shù)字?jǐn)?shù)據(jù)經(jīng)由模擬傳輸設(shè)施進(jìn)行傳送。
J . mitola proposed software radio ( or software defined radio , sdr ) technology to deal with those problems , i . e . , digitizing waveforms as near as possible to rf , and modulating / demodulating signals by software 針對(duì)這些問(wèn)題, j . mitola提出了的射頻信號(hào)數(shù)字化、軟件化處理的思想,即軟件無(wú)線電技術(shù),成為解決上述問(wèn)題的有效途徑。
The method is given to solve the problem in adaptive demodulation that adjudgement will worsen when the snr is low . by using the error signals to reduce the demodulated signals , the bit error rate will be improved 仿真中,針對(duì)dpsk信號(hào)的自適應(yīng)解調(diào)中小信噪比下門(mén)限失效的問(wèn)題,提出了利用誤差改進(jìn)門(mén)限判決的方法,將誤碼性能提高了1 2db 。
The test results show that different patterns of pd correspond to different demodulating signal waveforms , the pd phase angle in ac , and spectrum characteristics . therefore the pd patterns can be recognized by the uhf characters of different pd signals in gis 試驗(yàn)結(jié)果表明,不同缺陷類型的局部放電在其檢波信號(hào)波形、局部放電工頻相位分布和超高頻頻譜特征是有所不同的,可以依據(jù)這些特征對(duì)gis內(nèi)的局部放電類型進(jìn)行識(shí)別。
A gis pd measuring system is established , including a conventional pd measurement system , uhf detecting system and a pd spectrum system . we can obtain pd signal characters by this system , such as uhf transient signal waveforms , uhf demodulating signal waveforms , the pd phase angle in ac , pd spectrum , and discharge quantities 建立了gis局部放電測(cè)量系統(tǒng),其中包括:常規(guī)局部放電測(cè)量系統(tǒng)、超高頻檢波測(cè)量系統(tǒng)和放電頻譜測(cè)量系統(tǒng)等,通過(guò)測(cè)量系統(tǒng)得到了gis內(nèi)局部放電的超高頻暫態(tài)信號(hào)波形、檢波信號(hào)波形、工頻相位分布、頻譜特征以及常規(guī)視在放電量等特征。