Combined data rate reduction system

A method of reducing the data rate of a data stream of multi-bit digital data words representing video information for the purpose of transmitting a reduced number of data words and for subsequently reconstructing the data stream upon receipt of the transmission thereof, comprising the steps of:

• dropping data words from said data stream;
• performing differential pulse code modulation on said remaining data words, thereby resulting in a reduced number of data bits per data word;
• transmitting said reduced bit data words;
• receiving said reduced bit data words;
• reconstructing said data words to the original multi-bit data words utilizing differential pulse code modulation;
• and
• reconstructing said data stream by generating and inserting an interpolated value in the locations where data words had been removed, said value being determined by a finite response digital filter operating on said remaining data words.

A method of reducing the data rate of a data stream of data words of video information for the purpose of transferring a fewer number of data words and subsequently reconstructing said data stream, comprising the steps of:

• dropping each n.sup.th data word from said data stream;
• reducing the number of data bits per data word utilizing differential pulse code modulation;
• reconstructing the data words to the original number of data bits per data word utilizing differential pulse code modulation subsequently of transferring;
• and
• reconstructing said data stream by generating and inserting an interpolated value in the locations where data words had been removed, said value being determined by a finite impulse response digital filter operating on said remaining data words.

Apparatus for reducing the data rate of a data stream of data words of video information for the purpose of transferring a fewer number of data words and subsequently reconstructing said data stream, comprising:

• means for dropping each n.sup.th data word from said data stream;
• means for performing differential pulse code modulation on said remaining data words to thereby reduce the number of data bits per data word;
• means for performing differential pulse code modulation on said reduced bit data words subsequently of transferring to thereby reconstruct the data words to the original number of data bits per data word;
• and
• means for reconstructing said data stream by generating and inserting an interpolated value in the locations where data words had been removed.

Apparatus for reducing the data rate of a data stream of multi-bit digital data words representing video information for the purpose of transferring a reduced number of data words and for subsequently reconstructing the data stream, comprising:

• means for dropping data words from said data stream;
• means for performing differential pulse code modulation on the remaining data words to thereby provide a reduced number of data bits per data word;
• means for transferring said reduced bit data words;
• means for receiving said reduced bit data words;
• means for reconstructing said data words to the original multi-bit data words utilizing differential pulse code modulation;
• and
• means for reconstructing said data stream by generating and inserting an interpolated value in the locations where data words had been dropped, said value being determined by a finite response digital filter operating on said remaining data words.

Apparatus for reconstructing a data stream upon receipt of the transfer thereof, wherein said data stream has had data words dropped therefrom and the remaining data words contain a reduced number of data bits per data word as a result of differential pulse code modulation having been performed on said remaining data words, comprising:

• means for receiving said reduced bit data words;
• means for reconstructing said data words to the original multi-bit data word length utilizing differential pulse code modulation;
• and
• means for reconstructing said data stream by generating and inserting an interpolated value in the locations where data words have been removed, said value being determined by operation of a finite impulse response digital filter operating on said remaining data words.