Number format conversion apparatus for signal processing

Details Number format conversion apparatus for signal processing Number format conversion apparatus for signal processing

1994-12-29

1997-04-08

Young, Brian K.

Coded data generation or conversion

Digital code to digital code converters

364748, H03M 700

Patent

active

056191987

ABSTRACT:
A number format conversion apparatus for signal processing has as inputs an exponent value and a mantissa value, the exponent and mantissa values representing a numerical value for a signal sample. An operator inputs an exponent max/min range and an offset, depending upon what conversion is desired. An output exponent is derived from the input exponent as a function of the maximum and minimum exponent values and the exponent offset. A shift value is derived from an unclipped output exponent and the minimum exponent value. The shift value is applied to a barrel shifter to shift the mantissa value to produce an output mantissa. The output exponent and mantissa form a floating point output number for the signal sample when a floating point output is selected, and the mantissa forms a fixed point output number for the signal sample when a fixed point output is selected. Thus a single circuit, implementable as a block on an ASIC, performs number format conversion between floating point and fixed point number formats.

REFERENCES:
patent: 4589067 (1986-05-01), Porter et al.

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