Methods and apparatus for recording, reproducing, transmitting and/or receiving compressed data, and a recording medium therefor, utilize frequency dividing filters for dividing the frequency range of digital signals into plural frequency bands, orthogonal transform circuits for producing signal components...http://www.google.com.tw/patents/US5548574?utm_source=gb-gplus-share專利 US5548574 - Apparatus for high-speed recording compressed digital audio data with two dimensional blocks and its compressing parameters
