A symmetrically balanced phase and amplitude base band...

H - Electricity – 04 – B

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H04B 1/16 (2006.01) H04H 5/00 (2006.01)

Patent

CA 2090739

A SYMMETRICALLY BALANCED PHASE AND AMPLITUDE BASE BAND PROCESSOR FOR A QUADRATURE RECEIVER Abstract of the Disclosure A digital receiver (10) has a symmetrical base band processor (28, 30, 32, 34, and 36) which concurrently provides a left and a right channel of audio information. Because of the symmetrical design of the base band processor, each of the left and right channels of information has perfectly balanced phase and amplitude with respect to each other. The base band processor includes an adaptive gain compensator (28), multipliers (30, 32), and high pass filters (34, 36). Compensator (28) iteratively derives a gain factor which is multiplied by both an in-phase component and a quadrature component of a quadrature modulated input signal to respectively provide a composite of the left and right channels and a difference between the left and right channels. Subsequently, adders (44, 48) arithmetically manipulate the composite and difference of the channels to separate the left and the right audio information.

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