Engine sound synthesis method and system

Abstract

The invention relates to an engine sound synthesis method and system. The method comprises the following steps: performing low-pass filtering on each engine sound segment to obtain a low-frequency harmonic signal; performing high-pass narrow-band filtering on each engine sound segment to obtain a high-frequency narrow-band synthesis signal; adopting a Hilbert transform technology to decompose thehigh-frequency narrow-band signal of each engine sound segment to obtain a corresponding envelope signal and a carrier signal; splicing the low-frequency harmonic signals of all the engine sound segments to obtain a low-frequency harmonic spliced signal; splicing the carrier signals of all the engine sound segments to obtain a carrier spliced signal; splicing the envelope signals of all the enginesound segments to obtain an envelope spliced signal; multiplying the envelope spliced signal by the carrier spliced signal to obtain a high-frequency narrow-band synthesis signal; and adding the low-frequency harmonic spliced signal and the high-frequency narrow-band synthesis signal to synthesize the engine sound. The trueness of engine sound synthesis can be improved.

Description

technical field [0001] The invention relates to the field of sound synthesis, in particular to an engine sound synthesis method and system. Background technique [0002] People have become accustomed to the existence of various car sounds, and can distinguish the quality of various engine sounds. Electric vehicles on the road, quiet cars while reducing road noise, but also pose a potential danger to pedestrians. Therefore, the synthesis of engine sound has application value in many fields. For example, in the field of electric vehicles, the synthesized engine sound can be used as a warning sound to remind pedestrians; in the field of virtual driving, playing the synthesized engine sound can increase the realism of driving. [0003] In the prior art, some documents disclose that the engine sound synthesis technology regards sound as harmonics and random noises. During spectral processing and restoration, some details are necessarily lost, and these details are often very im...

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Problems solved by technology

However, since PSOLA is spliced ​​according to the length determined by the fundamental frequency in the time domain, it cannot ensure that the waveforms of each frequency are aligned at the same time, and the phases in the high frequency band do not match, resulting in jumps or false frequencies at the junction of spectral lines. In addition, because the engine sound clip is very short, when the engine speed changes slowly or is stable, it will be unnatural to play the same sound in a loop, and the effect of the phase mismatch of the splicing segment will be more obvious

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