Patent ID: 7859777
Filing Date: 2010-12-28
Classification: G11B,H04N

Abstract:
1. A method for transmitting and receiving digital information which includes digital video information and digital audio information so as to transmit and to receive the digital video information and the digital audio information, comprising: a compressing step which compresses the digital information by bit-compressing the digital video information by a first compression method and by bit-compressing the digital audio information by a second compression method which is different from the first compression method, and by time-compressing the digital video information and digital audio information; a parity signal adding step which adds a parity signal for detecting an error to the digital information compressed by the compressing step, the error being the error occurring in a transmission path and not in a recording process of the digital information; a modulating step of phase shift-keying-modulating the digital information to which the parity signal has been added by the parity signal adding step; a transmitting step which transmits the digital information modulated by the modulating step to the transmission path; a receiving step which receives the compressed digital information from the transmission path including the compressed digital video information and the compressed digital audio information; a demodulating step which demodulates the compressed digital information received in the receiving step corresponding to the phase shift keying-modulation; an error detecting step which detects an error of the compressed digital information demodulated in the demodulating step by use of the parity signal, the error being the error occurring in the transmission path and not in the recording process of the digital information; and; an expanding step which expands the compressed digital information error-detected by the error detecting step by bit-expanding the compressed video information corresponding to the first compression method and by bit-expanding the compressed audio information corresponding to the second compression method; and wherein a transmission rate of the digital information transmitted by the transmitting step is lower than that of the digital information inputted in the compressing step.