Apparatus and methods are provided for variable length encoding and transmitting a plurality of predetermined portions of digital image signals which has been encoded to compress image data therein Each of the plurality of predetermined portions is variable length encoded to form a corresponding one of a plurality of variable length encoded portions The amount of data in each of the portions is limited so that an amount of data contained in the corresponding variable length encoded portion is equal to or less than a predetermined target value The variable length encoded portions are arranged in a plurality of sync blocks having a predetermined data length such that each portion is contained entirely within a respective number of sync blocks and the sync blocks are transmitted via a transmission medium

Apparatus and methods for transmitting compressed digital image signals

Verfahren und Vorrichtung zur Übertragung von komprimierten digitalen Bildsignalen

A novel bit-rate reduction method developed for the MUSE (multiple subNyquist sampling encoding) signal is discussed. This method uses an orthogonal transformation by which the MUSE data-rate is reduced from 1/2 to 1/3 of the original, maintaining a picture quality acceptable for the home-use digital VTR of a HDTV (high-definition television) system. By simultaneous application of two-dimensional DCT (discrete cosine transform) and nonlinear quantization methods for a quincuncial pixel arrangement formed within a field, an optimum data assignment between DCT coefficients and nonlinear quantization values is accomplished by using a variable length coding method. >

C. Yamamitsu

Papers

A bit-rate reduction for MUSE signal