High speed FIR transmitter

A register for storing and manipulating a set of k data coefficients comprising:

• a set data storage cells arranged in n rows and m columns;
• a set of control terminals responsive to control signals;
• and
• auxiliary register means for changing the contents of selected cells in response to said control signals while the sum of said k data coefficients remains constant.

A method of manipulating data in a register containing a set data storage cells arranged in n rows and m columns that contain a set of k data coefficients;

• a set of control terminals responsive to control signals;
• and
• auxiliary register means for changing the contents of selected cells in response to said control signals while the sum of said k data coefficients remains constant, comprising the steps of:
• resetting the contents of all cells to “0”;
• setting the contents of all cells in a main row to “1”;
• decrementing the main row by x bits and automatically incrementing a first row by x bits;
• decrementing the first row by y bits and automatically incrementing a second row by y bits;
• decrementing the second row by z bits and automatically incrementing a third row by z bits, whereby the sum of the bits in said register automatically remains constant.