Clipping 廠商們大置上分為 Soft,Mid or Hard.
原理參考一下 Analog 線路容易明白。
There seems to be something really nice about the idea of soft clipping. Rather than have the amplifier clip any wayward peaks with the traditional square-edged characteristics typical of solid state amplifiers, wouldn't it be nice if they did much the same as a valve amp? A comparison of the two forms of clipping is shown in Figure 1, and you can see that the valve amp's clipping behaviour is more 'civilised' (if any form of clipping can be considered civilised, that is).
Comparison of Transistor (Red) and Valve (Green) Clipping
The 'soft' characteristic (Green) shown in Figure 1 has few high order harmonics. The harmonic content is predominantly third harmonic, with a smaller amount of fifth, and lesser amounts of each additional higher odd-order harmonic. Because the waveform is symmetrical, even order harmonics are typically at vanishingly small amplitudes. Figure 2 shows the harmonic structure of each waveform. Note that the hard clipping produces high levels of eleventh, fifteenth and nineteenth harmonics compared to the soft clip circuit. However, both signals will sound objectionable with the amount of clipping shown.
Spectrum of Transistor (Red) and Valve (Green) Clipping Distortion
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本帖最后由 dabeat 于 10-4-7 20:16 编辑 ]
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