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US 6,553,399 B1Granted
Method and circuit for envelope detection using a peel cone approximation
AssigneeChung-Shan Institute of Science
InventorsYuh-miin Yeh, Chin-Hung Chiou
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Abstract
The present invention discloses an envelope detection circuit by using a peel cone approximation concept. The envelope detection circuit comprises an absolute value comparision mechanism, a read only memory and a multiplier/adder mechanism. Particularly, the present invention uses a divider to generate an address of the read only memory to obtain less error and less hardware cost.
Claims4
An improving envelope detection circuit using a peel cone approximation, comprising:
- an absolute value comparision mechanism including:
- an absolute value determining circuit for determining positive values for incoming values of x and y;
- and
- a maximum/minimum value determining circuit for determining a maximum value xm and a minimum value ym for the incoming values x and y after their positive values are determined;
- a read only memory for storing constant values a and b based on address signals;
- and
- a multiplier/adder mechanism for performing multiplication and addition operations on the constant values a and b from the read only memory together with values xm and ym outputted from the absolute value comparision mechanism and for outputting a square root of the sum of two squares of the values x and y;
- wherein the improvement comprises:
- a divider connected between said absolute value comparision mechanism and said read only memory to generate a quotient k with the dividend ym and the divisor xm for the address of said read only memory.
6 more elements
Dependencies are inferred from the claim text.