Method of coding a real signal into a quantized signal

A device for coding a real signal, for example a video signal, into a quantized signal, comprising a module configured to execute a computer-implemented method for coding a real signal, for example an image signal, into a quantized signal, said method comprising the following steps applied to each real sample of said real signal:

• converting the real sample into a digital representation as a binarized sample comprising a fractional part,
• selecting, in the fractional part of the number, a predetermined number N of most significant non-zero bits,
• for each non-zero significant bit i selected, i varying from 1 to N, determining its distance Pi with respect to the neighboring selected non-zero significant bit of higher rank or, for the first non-zero significant bit selected, with respect to the decimal point,
• deducting from said distance P;
• the smallest possible value of distance between two non-zero bits in any binarized number converted into said digital representation,
• coding the modified distance Pion a predetermined number Mi of bits.

A computer program comprising instructions stored on a tangible non-transitory storage medium for executing on a processor a computer-implemented method for coding a real signal, for example an image signal, into a quantized signal, said method comprising the following steps applied to each real sample of said real signal:

• converting the real sample into a digital representation as a binarized sample comprising a fractional part,
• selecting, in the fractional part of the number, a predetermined number N of most significant non-zero bits,
• for each non-zero significant bit i selected, i varying from 1 to N, determining its distance Pi with respect to the neighboring selected non-zero significant bit of higher rank or, for the first non-zero significant bit selected, with respect to the decimal point,
• deducting from said distance Pi the smallest possible value of distance between two non-zero bits in any binarized number converted into said digital representation,
• coding the modified distance Pi on a predetermined number Mi of bits.

A multiplier circuit configured to calculate the result of multiplying a first number xi by a second number wi, both of which are quantized by applying a computer-implemented method for coding a real signal, for example an image signal, into a quantized signal, said method comprising the following steps applied to each real sample of said real signal:

• converting the real sample into a digital representation as a binarized sample comprising a fractional part,
• selecting, in the fractional part of the number, a predetermined number N of most significant non-zero bits,
• for each non-zero significant bit i selected, i varying from 1 to N, determining its distance Pi with respect to the neighboring selected non-zero significant bit of higher rank or, for the first non-zero significant bit selected, with respect to the decimal point,
• deducting from said distance Pi the smallest possible value of distance between two non-zero bits in any binarized number converted into said digital representation,
• coding the modified distance Pi on a predetermined number Mi of bits with a number N, equal to two, of distances, said circuit comprising an adder designed to add together the first distance of the first quantized number xi and the first distance of the second quantized number wi, a correspondence table indexed at least by the values of the second distance of the first quantized number xi and of the second distance of the second quantized number wi and a shift register configured to carry out a binary shift on the output of the correspondence table of a number of bits equal to the output of the adder.