| 摘要 |
The present invention relates to a method with which a speech signal can be compressed, respectively reconstructed, with the aid of two-dimensional algorithms developed for image processing. Both the compression and reconstruction can be thought of being formed from two different phases. In the first phase from a one-dimensional speech signal a two-dimensional image matrix (spectrogram) is formed in which the frequency components of a speech signal transformed from time domain to frequency domain with e.g. Fast Fourier Transform algorithm are presented frame by frame as a function of time. In the second phase of the method the image presented by the image matrix is compressed with a powerful two-dimensional compression algorithm, e.g. by JPEG. The reconstruction of speech is performed in inverse order; decompression (IJPEG) and inverse FFT (IFFT). The method is particularly appropriate for storing and transmitting speech when no strict real time properties are necessitated in the transmission or storing. <IMAGE> |
