| 摘要 |
PCT No. PCT/FR93/00165 Sec. 371 Date Oct. 19, 1993 Sec. 102(e) Date Oct. 19, 1993 PCT Filed Feb. 18, 1993 PCT Pub. No. WO93/17508 PCT Pub. Date Sep. 2, 1993.A method and a system for processing digital audio signal preechoes. Samples x(n) are frequency transform block-coded as coefficients y(k) then transmitted as coefficients Cy(k), decoded as coefficients y(k), and reverse frequency transform processed to recreate the original post-transmission signal x'(n). During the coding process and after the coding of coefficients for the transmission of coded coefficients Cy(k), the coded coefficients Cy(k) are decoded and reverse frequency transform processed to recreate the decoded signal x''(n), which is substantially identical to signal x'(n), and the optimal filtering mask is determined in order to recreate the original signal x(n). The coded coefficients Cy(k) and the gain and filtering mask parameters are simultaneously transmitted to the decoding process. Suitable filtering of the original post-transmission signal x'(n) is performed during the decoding process in order to recreate the original post-transmission and post-processing signal xt(n). The method and system may be used in processing digital audio signals in the phonogram or videogram industries. |
