Patent ID: 7869609
Filing Date: 2011-01-11
Classification: H03D

Abstract:
1. A signal mixer for mixing a plurality of signals comprising: a first adder having a first input for receiving a first signal sample and a second input for receiving a second signal sample to provide a first intermediate result; a multiplier for multiplying the first signal sample with the second signal sample to provide a second intermediate result; a second adder having a first input for receiving the second intermediate result and a second input for receiving the first intermediate result to obtain a third intermediate result that is zero or has a sign comprising one of a group consisting of a first sign and a second sign; a third adder having a first input for receiving the first intermediate result and a second input for receiving the second intermediate result to provide a fourth intermediate result that is zero or has a sign comprising one of a group consisting of the first sign and the second sign; a first step function circuit for discarding the third intermediate result if the sign of the third intermediate result is the first sign; a second step function circuit for discarding the fourth intermediate result if the sign of the fourth intermediate result is the first sign; and a first circuit for providing an output signal sample based on the third intermediate result if the sign of the third intermediate result is the second sign and on the fourth intermediate result if the sign of the fourth intermediate result is the second sign.