Digital signal recording system for recording digital signals on video tape

DETAILED DESCRIPTION It is an object of the present invention to provide a digital signal recording system which increases picture data compression while maintaining a high quality picture.
Therefore, in order to accomplish the above-stated objects, a digital signal recording system according to the present invention comprises: an A/D converter for converting NTSC composite analog signals into digital signals; an Y/C separator for separating a luminance signal and a chrominance difference signal from the digital output of the A/D converter; a first and a second sub-Nyquist samplers for compressing a data transmission bit rate of the luminance signal and the chrominance difference signal outputted from the Y/C separator; a mixer for arranging the chrominance difference signals R-Y and B-Y compressed and outputted from the second sub-Nyquist sampler alternately each other; a first and a second Hadamard transformers for compressing on an average the luminance signal Y of 8 bits and the chrominance signals R-Y and B-Y of 8 bits respectively outputted from the first sub-Nyquist sampler and the mixer; a first and a second vectior quantizer for classifying the data components transformed in the first and the second Hadamard transformer into a plurality of groups and for reducing the number of bits by predetermined bits through performing a two-dimensional vector quantization for each of the groups; a first and a second error correction coder for adding an error correction bit using a Reed-Solomon code to the outputs of the first and the second vector quantizer, and for outputting data having a predetermined transmission bit rate with respect to each of the channels; a first and a second modulator for converting the 8-bit data outputted from the first and the second error correction coder into 10-bit data by using 8-10 block code system; a delay device for delaying the chrominance difference signals R-Y and B-Y outputted from the second modulator for a predetermined time; and a head drum for recording the luminance signal Y and the chrominance signals R-Y and B-Y of one frame outputted from the second modulator and the delay device, respectively on eight tracks in the tape by four heads