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Over the last decade, time–frequency masking techniques have been explored to achieve substantial improvement of speech intelligibility in noise. Binary or soft mask can be applied to the noisy speech for speech separation. Binary masking approach retains the time–frequency (T–F) units of the noise-corrupted signal where the target speech is stronger than the interfering noise, and removes the T–F units where the interfering noise is dominant. While binary mask is 0 or 1, soft mask can take any value mostly in the range from 0 to 1, and is closely related to the frequency domain Wiener filter gain. Motivated by intelligibility studies of speech synthesized using the ideal binary (or soft) mask, a number of subsequent researches on estimating T–F mask have been conducted for practical use. This paper reviews the T–F masking strategies, covering the definition, preliminary studies with ideal mask, and the estimation of mask in practice.

Review of Time–Frequency Masking Approach for Improving Speech Intelligibility in Noise