Cerence has patented methods and systems for deessing speech signals, involving analyzing spectral envelopes to identify frequency content for deessing and applying deesser weights to sibilant sounds. The technology includes controlling compressor attack and release using soft and hard thresholds based on sharpness measures, with potential applications in in-car communications. GlobalData’s report on Cerence gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Cerence, Smart voice assistant was a key innovation area identified from patents. Cerence's grant share as of January 2024 was 76%. Grant share is based on the ratio of number of grants to total number of patents.
Speech signal deessing method using spectral envelope analysis
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A recently granted patent (Publication Number: US11817115B2) discloses a method and system for deessing a speech signal using spectral analysis and weighting techniques. The method involves analyzing the full spectral envelope of a speech signal in each time frame to identify frequency content for deessing, with a focus on sibilant sounds. By applying deesser weights, the system controls the attack and release of a compressor, which includes soft and hard thresholds to manage sharpness levels effectively. The spectral weighting process matches the frequency resolution of the full spectral envelope, enhancing the accuracy of the deessing process.
Furthermore, the patented technology incorporates psychoacoustic measures, such as sharpness and roughness, to refine the deessing process. The system calculates these measures from the spectral envelope and adapts deesser weights accordingly. By detecting sibilant sounds and adjusting weights based on sharpness levels, the system optimizes the deessing performance. Additionally, the system utilizes gradient-descent methods to dynamically adjust deesser weights based on the sharpness measures, ensuring efficient control of the compressor's attack and release. Overall, the patented deesser system offers a sophisticated approach to enhancing speech signal quality through precise spectral analysis and weighting techniques, ultimately improving the overall audio output in speech processing systems.
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