time frequency representation 中文意思是什麼

time frequency representation 解釋
時頻表示
  • time : n 1 時，時間，時日，歲月。2 時候，時刻；期間；時節，季節；〈常pl 〉時期，年代，時代； 〈the time ...
  • frequency : n. 1. 屢次，頻仍，頻繁。2. （脈搏等的）次數，出現率；頻度；【物理學】頻率，周率。
  • representation : n 1 表示，表現，描畫，描寫；畫像，肖像；雕像，想像，想像力；【心理學】表象。2 上演，演出；扮演。3...
  1. The signal we named it fundamental wave ; according to the fundamental wave, coefficients of the fundamental wave can be lined in a sequence. when the unique of the dissolve of the fundamental wave can be confirmed, the sequence of the coefficients can be regarded as one of representation forms of the signal itself ; theory of dissolvable signal shows that when order of the matrix of fundamental wave sampling equals to number of fundamental waves, the sequence of the sampling values from sampling points must be matched one by one with the sequence of the coefficients of fundamental waves. the sampling composed by sequences of the sampling values must be full sampling ; the relevant deductions of the theory of dissolvable signal shows that when sampling the signal, sampling frequency must be lager than the ratio of the number of fundamental waves to the occupation time of the fundamental waves ; to band - limited signals, when the fundamental wave is a sine signal, the results from the relevant deductions of theory of dissolvable signal is coherent to the classic sampling theory

    本文通過分析認為，當信號集中的任一信號可表示為一系列已知信號的線性代數和時，信號集便構成可分解信號集，已知信號稱為基波信號；對可分解信號而言，基波系數構成一序列，當對指定的基波信號集分解唯一確定時，系數序列本身便是信號的一個表示；可分解信號采樣定理指出當基波樣值矩陣的秩等於基波數時，則由采樣點處的采樣樣構成的樣值序列必與基波系數序列一一對應，從而由該樣值序列構成的采樣必為完全采樣；可分解信號采樣定理中的推論指出，對信號集進行采樣，采樣頻率必須大於其信號分解的基波數與其對應時長之比；對有限帶寬信號，若基波信號為正弦信號時，由可分解信號采樣定理推論給出的結論與經典采樣定理一致。
  2. Adaptive time - frequency representation based on fractional fourier transform

    基於分數階傅立葉變換的自適應時頻表示
  3. The four - parameter basis functions decomposition of time - frequency signal representation is presented based on the characteristics of doppler frequency of the radar echoes, thereby dopplerlet transform is introduced

    根據接收到的雷達目標回波信號的多普勒頻率特性，提出用4參數基函數的時頻信號表示法，從而引出多普勒小波變換的概念。
  4. The classical signal analysis method is fourier transformation, whose essence is to decompose the signal wave into many sine waves, and which also can be seen as representation of time function in frequency domain

    傅里葉（ fourier ）變換是經典的信號分析方法，其實質是：把波形分解成許多不同頻率的正弦波之和，可看作是時間函數在頻率域上的表示。
  5. Y type and s type dual - path saw mass sensors have been tested and analysed in detail. their frequency domain characteristics and time domain characteristics have been tested under non - oscillatory mode. transmission characteristics of y type s type and " - " type saw mass sensors are derived by p matrix representation. primary delay signal triple reflection signal and quintuple reflection signal of these sensor devices have been analysed in detail

    結果表明，在正常工作模式下， y型和s型雙聲路聲表醚質量傳感器件的三次渡越反射信號和五次渡越反射信號比「一」字型雙聲路聲表醚質量傳感器件的三次渡越反射信號和五次渡越反射信號分別小12db 、 16 . 67db和n _ . sdb ? 17 . 3db 。
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