這個話題很少資料在談
音響系統裡頭失真最大應該就是唱頭和喇叭了
用squarewave來看喇叭的反應的, google不到幾張, 還真的是蠻慘的...所以大家可能都不敢貼出來了
QUAD 2805, 500Hz
Klipsch cornwall, 1kHz
Vandersteen, 500Hz
唱頭也一樣, 我只有找到Decca Jubilee的, 1kHz
River 寫:音響系統裡頭失真最大應該就是唱頭和喇叭了
River 寫:用squarewave來看喇叭的反應的, google不到幾張, 還真的是蠻慘的...所以大家可能都不敢貼出來了
...
Klipsch cornwall, 1kHz
drunkenlife 寫:另一個方向的觀點,
喇叭類似個樂器,每件樂器皆有其聲音特色,也就是其諧波組合;
喇叭也是如此,只是我們對喇叭的要求是盡量沒特色,也就是沒失真;
特色比較明顯的喇叭唱啥都有那個味道,與沒特色的喇叭比較起來,類似某人平時的聲音與感冒時的聲音,
我們還是聽得出來是其人,只是聲音有點差異。
這就帶出一點,喇叭的失真形式是什麼類型?
倘若類似樂器般是偶次諧波,那麼這喇叭唱出來的聲音雖不傳真,但會顯得豐富,不會刺耳。
倘若是奇次諧波,那就不太好聽,
若是其他雜七雜八雜訊,那就很吵。
A-weighting was intended for measurement of the audibility of sounds by themselves. It was never specifically intended for the measurement of the more random (near-white or pink) noise in electronic equipment, though has been used for this purpose by most microphone manufacturers since the 1970s. The human ear responds quite differently to clicks and bursts of random noise, and it is this difference that gave rise to the 468-weighting, which together with quasi-peak measurement (rather than the rms measurement used with A-weighting)
相較於擴大機0.1%以下這數字,3%當然算高。Most speakers give around 3% distortion measured 468-weighted 'distortion residue' reducing slightly at low levels.
這有趣,不知其中的機制是啥...Electrostatic speakers can have lower harmonic distortion, but suffer higher intermodulation distortion. 3% distortion residue corresponds to 1 or 2% Total harmonic distortion.