Digital data transmitting system for transmitting digital data a number of times depending on an information content of the digital data

Claim 1

A digital data transmitting system for transmitting a plurality of channels of digital data through a transmitting medium such as a recording medium, said plurality of channels of digital data being obtained by subjecting information signals to a digital modulation, said information signals comprising a non-compressed audio signal, a video signal, and an information signal other than the non-compressed audio signal and the video signal, said digital data transmitting system comprising: first means for transmitting a channel of digital information signal data which are obtained by subjecting said information signal to the digital modulation, said digital information signal data being divided into sectors each having k words, where k is a natural number, and being transmitted within a predetermined transmission time period so that a sector is transmitted once or repeatedly a number of times depending on an information content of the sector; and second means for adding a first code and a first synchronizing signal to each sector of said digital information signal data which are obtained from said first means, and for transmitting the digital information signal data which have the sectors added with said first code and said first synchronizing signal, said first code assuming the same value for sectors which are repeatedly transmitted within said predetermined transmission time period, each of said sectors being transmitted with a signal format in which a mode code indicative of a kind of the information content of the sector, a first error detecting code, and a second code indicative of a sequence of the sector within said predetermined transmission time period, are time-sequentially transmitted together with said first code and said first synchronizing signal which are obtained from said second means, said mode code being made up of a first mode code indicative of the kind of the information content of the sector when upper and lower parts of each word of the sector are of the same kind, and a second mode code indicative of a combination of the different kinks when the upper and lower parts of each word of the sector are of different kinds.