04290111 is referenced by 5 patents and cites 6 patents.

An addition circuit for adding two decibel measurements received at input terminals 12 and 14, first substracts the inputs in a subtractor circuit 16 to obtain a difference d. Then, based upon the magnitude of the difference d, the addition circuit determines the value of 10 log [1+10.sup.d/10 ] or 20 log [1+10.sup.d/20 ] in a read-only memory circuit 20. A selector circuit 24 determines which of the two input decibel measurements is the larger and controls the complementer circuit 18 so that the value of the difference d is always negative. The output of the read-only memory circuit 20 is added to the larger of the two input in an adder 22.

Title
Decibel addition circuit
Application Number
6/102708
Publication Number
4290111
Application Date
December 12, 1979
Publication Date
September 15, 1981
Inventor
Keith Dillon
Worthing
GB
Agent
Jeff Rothenberg
Douglas M Clarkson
Assignee
The Singer Company
NY, US
IPC
G06G 7/24
G06F 7/556
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