Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1985-07-02
1986-12-02
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
H03M 750
Patent
active
046268251
ABSTRACT:
A logarithmic converting apparatus for converting a digital binary integer into logarithmic representation and for converting logarithmic representation into digital binary integer is disclosed. The apparatus determines the bit position of a leading non-zero bit of an integer, shifts the integer such that the leading non-zero bit is the leftmost bit. A look-up table receives the shifted integer and provides a number representative of the mantissa portion of the logarithm of the shifted number. An encoder receives a Point Set Input value, a scale value for said integer, and the number of binary positions shifted and generates the exponential portion of the logarithm of the integer. For converting logarithmic representation of a number into integer representation, the apparatus has a look-up table which receives the mantissa component of the logarithmic representation and provides a first number. A decoder receives the exponential component of the logarithmic representation and a Point Set Output value, a scale value for said integer, and supplies a shifted signal. The shifted signal is supplied to a shifter along with the first number and the shifter shifts the first number by the shift signal to produce the integer.
REFERENCES:
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Burleson Wayne P.
Van Dyke Korbin S.
Wagner Lawrence F.
Miller Charles D.
VLSI Technology Inc.
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