Patent ID: 7027240

Claim:
An apparatus for transmitting and receiving digital information including a transmitting part for transmitting digital video information and digital audio information and receiving part for receiving digital video information and digital audio information: wherein the transmitting part comprises: a first compressor which bit-compresses digital video information by a first compression system; a second compressor which bit-compresses digital audio information by a second compression system; a parity signal adder which adds common parity signal for detecting an error to the digital video information and the digital audio information bit-compressed by the first compressor and the second compressor; a modulator which phase-modulates the digital video information and the digital audio information, to which the parity signal has been added by the parity signal adder; and a transmitter which transmits the digital video information and the digital audio information modulated by the modulator to a transmission path; wherein the receiving part comprises: a receiver which receives digital information which is digital video information bit-compressed by a first compression system plus digital audio information bit-compressed by a second compression system, and to which has been added a parity signal for error detecting, phase-modulated and transmitted to a transmission path; a demodulator which demodulates the digital information received by the receiver corresponding to the phase-modulation; an error detector which detects an error of the digital information demodulated by the demodulator by use of the parity signal; a first expander which bit-expands video information corresponding to the first compression system, the video information being among the digital information error detected by the error detector; and a second expander which bit-expands audio information corresponding to the second compression system, the audio information being among the digital information error detected by the error detector.