초록 ▼

A data compression apparatus is described which applies a dynamically variable degree of quantisation Qs to input data so as to control blocks of output data to have a predetermined maximum size. The dynamic control can be carried out on an inter-block basis or an intra-block basis. An overflow dete

A data compression apparatus is described which applies a dynamically variable degree of quantisation Qs to input data so as to control blocks of output data to have a predetermined maximum size. The dynamic control can be carried out on an inter-block basis or an intra-block basis. An overflow detector is provided for inserting an overflow indicator within blocks of compressed data to indicate when overflow has occurred.

대표청구항 ▼

A data compression method, comprising the steps of: receiving a current block of input data; indicating for each particular value in said current block of input data a desired number of bits of compressed data which should be used to represent values preceding said each particular value in said curr

A data compression method, comprising the steps of: receiving a current block of input data; indicating for each particular value in said current block of input data a desired number of bits of compressed data which should be used to represent values preceding said each particular value in said current block of input data; generating respective current value quantising numbers for each of the values in said current block of input data as a function of the respective desired number of bits of compressed data for the preceding values in said current block of input data and of the respective preceding value quantising numbers generated for preceding values in said current block of input data; and quantising values in said current block of input data using said respective current value quantising numbers to produce a block of compressed data having a size substantially equal to a predetermined maximum size.