Fast-acting dynamic range compression is a level-dependent amplification scheme which aims to restore audibility for hearing-impaired listeners. However, when being applied to noisy speech at positive signal-to-noise ratios (SNRs), the gain function typically changes rapidly over time as it is driven by the short-term fluctuations of the speech signal. This leads to an amplification of the noise components in the speech gaps, which reduces the output SNR and distorts the acoustic properties of the background noise. An adaptive compression scheme is proposed here which utilizes information about the SNR in different frequency channels to adaptively change the characteristics of the compressor. Specifically, fast-acting compression is applied to speech-dominated time-frequency (T-F) units where the SNR is high, while slow-acting compression is used to effectively linearize the processing for noise-dominated T-F units where the SNR is low. A systematic evaluation of this SNR-aware compression scheme showed that the effective compression of speech components embedded in noise was similar to that of a conventional fast-acting system, whereas natural fluctuations in the background noise were preserved in a similar way as when a slow-acting compressor was applied.

中文翻译：

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助听器中的信噪比感知动态范围压缩。

快速作用的动态范围压缩是一种取决于级别的放大方案，旨在为听力受损的听众恢复可听性。但是，当以正的信噪比（SNR）应用于嘈杂的语音时，增益函数通常会随着时间的变化而迅速变化，因为它是由语音信号的短期波动驱动的。这导致语音间隙中噪声成分的放大，从而降低了输出SNR并扭曲了背景噪声的声学特性。在此提出一种自适应压缩方案，该方案利用有关不同频道中SNR的信息来自适应地更改压缩器的特性。具体来说，快速压缩应用于SNR高的以语音为主的时频（TF）单元，而慢速压缩可用于有效地线性化SNR低的噪声为主TF单元的处理。对这种SNR感知压缩方案的系统评估表明，嵌入到噪声中的语音成分的有效压缩与传统的快动系统相似，而保留背景噪声的自然波动的方式与慢速时相似。 -作用压缩机。