GoldWave 音樂編輯軟體 -演算法與技巧- 學生: 冼達 指導教授: 丁建均 DISP, NTU 2018/11/20
Example: 去除人聲 如果遇到人聲和音樂合在一起的,可以透過效果==>立體聲==>減少人聲,不過這個方法效果有限,可能會連音效的聲音也被減少。 DISP, NTU 2018/11/20
基本操作: 音樂剪接與編輯合成 為了準確知道要接的起始點,可以按滑鼠右鍵透過【選取部分】==>【設定】得知要連接的起始點,也可以透過【設定】直接設定要修改的位置,才不會接錯點讓音樂聽起來怪怪的。 DISP, NTU 2018/11/20
Censor- 人工合成聲音 Effect -> Censor 可以選擇多種效果的人工合成音樂(High tone, ding, ding dong, …etc.) DISP, NTU 2018/11/20
Censor :the math model. High/medium tone: 純音 Ding: Ding Dong: Buzz: Siren(Doppler): 𝑦(𝑡)=cos(2𝜋 𝑓 𝑐 𝑡 𝑦(𝑡)=𝑎(𝑡)×cos(2𝜋 𝑓 𝑐 𝑡 𝑦(𝑡)= sin((𝑡×tan(400𝑡)+sin(600𝑡)×sin(𝑁× 𝑡 2 ) 1.5 𝑦(𝑡)=𝐴( 𝑛 𝑈(𝑡−𝑛𝑇 − 1 2 𝑦(𝑡)=𝐴cos(2𝜋𝑓𝑡), 𝑓=( 𝑣+ 𝑣 𝑟 𝑣+ 𝑣 𝑠 ) 𝑓 0 DISP, NTU 2018/11/20
Other censors #: (sin(5912*t)+sin(9280*t))/2 * : (sin(5912*t)+sin(7596*t))/2 0: (sin(5912*t)+sin(8394*t))/2 1: (sin(4379*t)+sin(7596*t))/2 2: (sin(4379*t)+sin(8394*t))/2 3: (sin(4379*t)+sin(9280*t))/2 4: (sin(4838*t)+sin(7596*t))/2 5: (sin(4838*t)+sin(8394*t))/2 6: (sin(4838*t)+sin(9280*t))/2 7: (sin(5353*t)+sin(7596*t))/2 8: (sin(5353*t)+sin(8394*t))/2 9: (sin(5353*t)+sin(9280*t))/2 Bender(弯音): wave(n+(1/T/16)*(sin(2*pi*t)+1)) Echoes, x=delay, y=volume(回声,x=延迟,y=音量): wave(n)+wave(n-(1/T)*x)*y Envelope detector(包络检测): (wave(n)>wave(n-1))*(wave(n)*0.1+wave(n-1)*0.9)+(1-(wave(n)>wave(n-1)))*(wave(n-1)*0.99) Frequency modulation(频率调制): cos(2*pi*f*t + y*wave(n)) Tremolo(震音): wave(n) * (0.6 + 0.4 * sin(2*pi*f*t)) DISP, NTU 2018/11/20
迴音(echo)特效 𝑦(𝑡)=𝑥(𝑡)+𝐴𝑥(𝑡−𝑁 DISP, NTU 2018/11/20
Filter: Digital bandpass filter 𝑦(𝑡)=𝐼𝐹𝐹𝑇(𝐹𝐹𝑇(𝑥(𝑡))×𝑟𝑒𝑐𝑡( 𝑓−𝐸 𝐵𝑊 ) DISP, NTU 2018/11/20
Filter: Manual Equalizer 𝑦(𝑡)=𝐼𝐹𝐹𝑇(𝐹𝐹𝑇(𝑥(𝑡))×𝑊(𝑓) DISP, NTU 2018/11/20
Filter: Noise Reduction Analysis the spectrum at the specific moment in green signal, and the desired or manual filter would be applied for the entire signal. DISP, NTU 2018/11/20
Silence reduction DISP, NTU 2018/11/20
Amplitude smoother 𝑦(𝑡)=𝑥(𝑡)×𝑓(𝑥(𝑡) DISP, NTU 2018/11/20
Reverse and Invert Reverse: Invert: 𝑦(𝑡)=𝑥(−𝑡 𝑦(𝑡)=−𝑥(𝑡 DISP, NTU 2018/11/20
Pitch: Offset the spectrum 𝑦(𝑡)=𝐹𝐹 𝑇 −1 (𝑋( 𝑓 1 ×𝑘) DISP, NTU 2018/11/20
Time Warp: Do interpolation in the waveform. 𝑦(𝑡)=𝑥( 𝑡 𝑁 DISP, NTU 2018/11/20