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Speech material

Results from offline processing. Comparison of dynamic range compression using single-band, multiband, and sliding-band compression schemes. Speech material “you will mark ut please” concatenated with scaling factors of 0.1, 0.8, 0.1, 0.4, 0.1 Processing

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Speech material

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  1. Results from offline processing Comparison of dynamic range compression using single-band, multiband, and sliding-band compression schemes Speech material “you will mark ut please” concatenated with scaling factors of 0.1, 0.8, 0.1, 0.4, 0.1 Processing Single-band, multiband, and sliding-band dynamic range compression using Win. len. = 25.6 ms, FFT len. = 512

  2. Distortions during spectral transitions: Example of swept sinusoidal input. Input: constant amplitude, 125 –250 Hz linearly swept frequency, 200 ms sweep duration Single-band compression output Multiband compression (18 auditory critical bands) output Sliding band compression output CR = 30, Ta = 6.4 ms, Tr = 192 ms. Time (s)

  3. Example: "you will mark ut please" concatenated with scaling factors for variation in the input level. CR = 2, Ta = 6.4 ms, Tr = 6.4 & 192 ms. Input waveform Scaling factor Unprocessed waveform Processed Tr= 6.4 ms, low Pmc Processed Tr= 192 ms, low Pmc Processed Tr= 6.4 ms, highPmc Processed Tr= 192 ms, highPmc Time (s) • Processing of different speech materials with varying levels: No audible roughness or distortion during informal listening.

  4. Results from real-time processing Example: "you will mark ut please" concatenated with scaling factors for variation in the input level. CR = 2, Ta = 6.4 ms, Tr = 192 ms, low Pmc. Unprocessed waveform Offline processed waveform Real-time processed waveform Time (s) Informal listening: real-time output perceptually similar to the offline output PESQ for real-time w.r.t. offline : 3.5 Signal delay = 36 ms Use of processing capacity: 41% (lowest proc. clock for satisfactory operation = 50 MHz, max. clock = 120 MHz)

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