| 摘要 |
An apparatus for enhancing intelligibility of speech and a voice output apparatus using the same are provided. The apparatus detects a level of a voice frame of an input signal through an input envelope detection unit, provides the level to a cutoff frequency estimation unit, detects a level of a voice frame of an output signal through an output envelope detection unit, provides the level to the cutoff frequency estimation unit, determines a difference value between a level of an N-th voice frame that is received from the input envelope detection unit and a level of an (N−1)st voice frame that is received from the output envelope detection unit in the cutoff frequency estimation unit, calculates a cutoff frequency for amplifying a consonant component of the input signal with the difference value, and a shelving filter filters the input signal according to a cutoff frequency that is calculated by the cutoff frequency estimation unit and selectively amplifies a portion that is estimated as a consonant component of the input signal. Accordingly, the shelving filter dynamically changes a cutoff frequency according to more or less of a consonant component in the input signal and according to less being changed, amplifies a high frequency component corresponding to a consonant component of the input signal and attenuates a low frequency component and thus the consonant component is selectively emphasized, whereby speech intelligibility is enhanced. |
