The envelopes are on the mel-frequency scale and IDFT is applied to extracting sample autocorrelations. We finally obtain cepstral coefficients (SEC) from sampling autocorrelation results.

• 谱包规定在mel频率级 ,由IDFT提取抽样自相关估计 ,我们从抽样自相关的结果最终获得谱包cep stral系数 (SEC)。