钢琴乐声仿真频谱模型研究

频谱模型的乐音仿真是运用声学理论,由一系列基本函数及其时变幅度乘积的迭加来实现乐器的发声。通过对钢琴琴弦振动和衰减特性的分析以及共鸣箱共振作用的探讨,提出了一种新的数字化钢琴乐音仿真技术,仿真模型由激励系统和共振系统两部分组成。系统以琴弦振动方程为基础,先进行时域上的包络修饰,以模拟琴弦振动的自然衰减,这样可以使乐音各音符间衔接和谐;然后在频域上以频谱包络建模滤波器组,实现共振系统的仿真,对音色进行修饰。该方法能更为有效的雕刻声音,同时较好的表现音色,从而使乐音听起来更加和谐。

Research on piano sound simulation spectrum model

Musical simulation based on spectrum model is the use of acoustic theory that can achieve musical instrument's sounds by sum of products of a series of basic functions and time-varying amplitude.A new digital piano sound simulation technique is proposed by analyzing piano string vibration and damping characteristics and investigating the resonance effect of resonance box.The simulation model consists of two parts:the excitation system and the resonance system.Based on the vibration equation of the strings,the envelope modification of time domain is carried out to simulate the natural attenuation of the strings,which can make music harmonious between the notes.Then,the filter group is modeled by spectrum envelope in frequency domain to achieve the simulation of resonance system.This new method can more effectively carving voice,has better performance timbre at the same time,therefore,it makes the sound more harmonious.