在 A 站 看到的 AA 高阶技术帖.
内容关键字 Volterra Kernel (Volterra 级数法)
我只稍懂一点儿 + - x / , 这些高阶数学 无缘分了.
There's nothing magic about the volterra stuff compared to algo. In fact the volterra method is what allows the Acustica IRs to behave in a way that algos can already do. Simply put, the Acustica tech is just many IRs taken from hardware and animated like frames of video. So this allows Acustica to change the IR when the signal gets hotter, for example. This means we can hear what the sampled hardware would sound like when responding to variable signal. Now, with a purely algo method such as softube, the algo can be designed to exhibit the correct colouration for any given signal. So it's more about the design of the algo which will effect its similarity to the hardware, not the fundamental tech itself. In fact algo has more possibility to sound closer to the hardware than volterra, but again it is dependent on the programmer and the choices made to design the algo.
The thing Acustica have is simply taking many snapshots of hardware and making a matrix of these frames. The 'magic', if you like, is that it's a sample of the hardware.. So it will sound like the hardware without much effort or cleverness. We're all familiar with sampling here so we get that. It's easier to make a snare sound realistic by deep sampling a real snare drum than it is to physically model a snare with algo. But if you do it right, the physical model will be more flexible and articulate than the sample. But it would require a great deal of skill. So it is with Acustica vs Algo.
You can sample the amplification stage in a classic moog synth (isolate that part of the electronics and run the IR test signal through it) and then apply that sampled IR to an Arturia emulation.. This will give you a much closer aproximation of the real instrument.
Similarly, it's the preamps that really shine with Acustica because this is what they have done. If you use an Acustica pultec for example, it's that preamp behaviour that gives it the biggest edge over a straight algo when it comes to sounding like a hardware piece. But if you turn off the preamp and remove the colouration, the EQ part becomes much closer to the algo pultecs. But the algo pultecs (at least some of the better ones) are also emulating the preamp and so could sound 'better' than the Acustica, potentially.
本帖最后由 ccb 于 24-1-7 18:09 编辑
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