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【正文】 Signal Transform and SpectrumFourier series 傅里葉級數(shù)periodic signal 周期信號sinusoidal function 正弦函數(shù)basis function 基函數(shù)Fourier analysis 傅里葉分析angular frequency 角頻率period 周期frequency 頻率signal analysis and synthesis 信號分析與綜合orthogonality 正交性integration 積分product 積sine and cosine 正弦和余弦equalizer 均衡器relative amplitude 相對幅度bass 重音 subband coding 子帶編碼infinitely differentiable 無限可微phase difference 相位差time delay 時延plex exponential function 復(fù)指數(shù)函數(shù)exponential signal 指數(shù)信號fundamental frequency 基頻linear bination 線性組合plexvalued coefficient 復(fù)系數(shù)correlation 相關(guān)fourier transform 傅里葉變換aperiodic signal 非周期信號spectral line 譜線discrete spectra 離散譜continuous spectrum 連續(xù)譜discretefrequency variable 離散頻率變量summation sign 求和號integral 積分discrete harmonic 離散諧波Fourier transform pair 傅里葉變換對Discrete Fourier Transform (DFT) 離散傅里葉變換finiteduration 時間有限（信號）inverse discrete Fourier transform (IDFT) 傅里葉逆變換algorithm 算法putational plexity 計算復(fù)雜性fast Fourier transforms (FFT) 快速傅里葉變換symmetric 對稱的time/frequency resolutions 時間/頻率分辨率inversely proportional 反比energyspectral density 能量譜密度powerspectral density 功率譜密度autocorrelation 自相關(guān)finiteenergy signal 能量有限信號stationary stochastic signal 平穩(wěn)隨機信號Unit 8 The Fundamental of Communicationsdigital signal 數(shù)字信號time/space variable 時間/空間變量discretetime signal 離散時間信號unitsample signal 單位采樣信號random process 隨機過程signal source 信號源analog signal 模擬信號sample 采樣、抽樣high fidelity 高保真block diagram 框圖digital signal processor 數(shù)字信號處理器analog input 模擬輸入lowpass filter 低通濾波器outofband 帶外sample andhold (S/H) 采樣保持continuoustime signal 時間連續(xù)信號analogtodigital converter (ADC) 模數(shù)轉(zhuǎn)換器digitaltoanalog converter (DAC) 數(shù)模轉(zhuǎn)換器timedomain sampling 時域采樣sampling and quantization 抽樣與量化interpolation插值quantization error 量化誤差periodic impulse train 周期脈沖序列sampling interval 采樣間隔sampling frequency 采樣頻率convolution 卷積operator 算子、算符Fourier transform 傅里葉變換signal spectrum 信號譜distortion 失真aliasing 混疊Nyquist sampling theorem 奈奎斯特采樣定理bandlimited continuoustime signal 帶寬受限連續(xù)時間信號electronic switch 電子開關(guān)capacitor 電容器rectangular impulse response 矩形脈沖響應(yīng)quantization level 量化級（電平）manytoone mapping 多對一映射quantizer 量化器quantization n
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