Late-Reverberation Synthesis using Interleaved Velvet-Noise Sequences

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This paper proposes a novel algorithm for simulating the late part of room reverberation. A well-known fact is that a room impulse response sounds similar to exponentially decaying filtered noise some time after the beginning. The algorithm proposed here employs several velvet-noise sequences in parallel and combines them so that their non-zero samples never occur at the same time. Each velvet-noise sequence is driven by the same input signal but is filtered with its own feedback filter which has the same delay-line length as the velvet-noise sequence. The resulting response is sparse and consists of filtered noise that decays approximately exponentially with a given frequency-dependent reverberation time profile. We show via a formal listening test that four interleaved branches are sufficient to produce a smooth high-quality response. The outputs of the branches connected in different combinations produce decorrelated output signals for multichannel reproduction. The proposed method is compared with a state-of-the-art delay-based reverberation method and its advantages are pointed out. The computational load of the method is 60% smaller than that of a comparable existing method, the feedback delay network. The proposed method is well suited to the synthesis of diffuse late reverberation in audio and music production.

Original languageEnglish
Article number9360485
Pages (from-to)1149-1160
Number of pages12
JournalIEEE/ACM Transactions on Audio Speech and Language Processing
Publication statusPublished - 2021
MoE publication typeA1 Journal article-refereed


  • acoustics
  • Audio systems
  • Delay lines
  • Delays
  • digital signal processing
  • filtering algorithms
  • Finite impulse response filters
  • Reverberation
  • Signal processing algorithms
  • Speech processing
  • White noise


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