Apparatus for digitally processing audio signal
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United States of America Patent
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-
Aug 18, 1992
Grant Date -
N/A
app pub date -
Apr 18, 1990
filing date -
Apr 18, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A digital signal processing apparatus for digitally performing a limiting or compressing process with respect to an input signal. The apparatus includes a comparator responsive to the input signal inputted through an input terminal of the apparatus for comparing the level of the input signal with a predetermined reference level and a calculation circuit for calculating a function on the basis of the difference between the input signal level and the predetermined reference level when the input signal level is higher than the predetermined reference level. Also included in the apparatus is an adding and subtracting circuit responsive to the output of the calculation circuit and the input signal. The adding and subtracting circuit performs addition or subtraction of the input signal with respect to the output of the calculation circuit representing the calculated function in accordance with whether the input signal is positive or negative. A multiplier multiplies the output of the adding and subtracting circuit by a predetermined gain coefficient and outputs the multiplication result from an output terminal of the apparatus.
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