| 摘要 |
<p>The invention concerns a method for producing a sound effects library representing the sound characteristics of motor vehicle engines. The invention is characterised in that the sound sequences are recorded in parallel with the running condition of the engine then transformed and stored in the form of synthetic digital data by the following steps: segmenting each recorded sequence into sequential blocks; performing a Fourier transform on each block; decomposing the Fourier transform of the block into a first curve of frequency peaks and a second curve of residual noise; synthesising the block by representing the first curve in the form of a set of Nf frequency values F and Na corresponding amplitudes values A, and representing the second curve with filtering coefficients Cf of a white noise of amplitude Ab, the values F, A, filtering coefficients Cf and Ab of each synthesised block being associated with the corresponding running condition of the engine; storing the set of synthesised blocks of a sequence.</p> |
