Video signal recording and reproducing apparatus with high efficiency encoding

A video signal recording and reproducing apparatus in which a digital video signal, representing an original image, is divided into blocks, wherein each block is orthogonally-transformed to obtain coefficients for encoding and recording encoded data on a recording medium, said apparatus comprising:

• means for producing data specifically encoded for high-speed replay by encoding only a portion of the coefficients in each block;
• means for recording said encoded data, including all coefficients for normal replay, and said data encoded for high-speed replay, including only the portion of the coefficients for high-speed replay, in different areas on said recording medium;
• and
• means for reproducing the original image from only said encoded data.

A video signal recording and reproducing apparatus comprising:

• means for dividing an input digital video signal into blocks;
• compressing means for compressing an amount of information by performing an orthogonal transform on each block;
• constructing means for constructing an information word of a predetermined size from coefficients obtained by said compressing means;
• and
• appending means for appending a check word to the information word,
• wherein, when the amount of information of the coefficients for one block obtained from said compressing means is smaller than an allocated information amount for the one block, said constructing means selects, from the coefficients obtained by said compressing means, low-frequency coefficients from the one block having an information amount equivalent to a difference between the amount of information of the coefficients for the one block obtained from said compressing means and the allocated information amount for the one block, and constructs an information word of the predetermined size from the selected low-frequency coefficients of the one block plus the amount of information of the coefficients of the one block obtained from said compressing means.

A video signal recording and reproducing apparatus comprising:

• means for dividing an input digital video signal into blocks;
• compressing means for compressing an amount of information by performing an orthogonal transform on each block;
• means for separating coefficients obtained from said compressing means into, at least a first information sequence including low-frequency coefficients and a second information sequence including non-low-frequency coefficients;
• and
• appending means for appending check words such that said first information sequence has a greater minimum distance than said second information sequence.

A video signal recording and reproducing apparatus, comprising:

• blocking means for dividing a video signal into a plurality of blocks;
• orthogonal transform means for orthogonally transforming each of the plurality of blocks into a plurality of coefficients;
• quantizing means for adaptively quantizing the plurality of coefficients to produce a plurality of adaptive quantized coefficients and a plurality of adaptively quantized low frequency coefficients;
• buffer means for storing the plurality of adaptively quantized low frequency coefficients;
• error correction block generating means for generating an information word of a predetermined size from the plurality of adaptively quantized coefficients and if the plurality of adaptively quantized coefficients are less than the predetermined size, then sequentially filling the information word with duplicates of the plurality of adaptively quantized low frequency coefficients from said buffer means to complete the information word;
• and
• error correction means for performing error correction on the information word in a column direction and a row direction and appending a column check word and a row check word to the information word.

A video signal recording and reproducing apparatus, comprising:

• blocking means for dividing a video signal into a plurality of blocks;
• orthogonal transform means for orthogonally transforming each of the plurality of blocks into a plurality of AC coefficients and a plurality of DC coefficients;
• quantizing means for adaptively quantizing the plurality of AC coefficients;
• DC blocking means for arranging the plurality of DC coefficients into a plurality of DC blocks;
• DC component orthogonal transform means for orthogonally transforming each of the plurality of DC blocks into a plurality of coefficients;
• DC quantizing means for adaptively quantizing the plurality of DC coefficients based on an AC component power value of a corresponding one of the plurality of AC coefficients;
• error correction block generating means for generating an information word of a predetermined size from the plurality of adaptive quantized AC coefficients from said quantizing means and the plurality of adaptive quantized DC coefficients from said DC quantizing means.