Patent ID: 8265129
Filing Date: 2012-09-11
Classification: H03D,H04B,H04L,H04N

Abstract:
1. A method of controlling the operating mode of an equalizer comprising steps of: identifying a direct current (DC) component of a received signal; and controlling the operating mode of the equalizer in response to the identification of the direct current (DC) component of said received signal, wherein the received signal at times comprises multi-level symbols representing data and a field synchronizing signal, said symbols being characterized by being accompanied by a substantially constant direct current (DC) offset component, and at other times comprises multi-level symbols representing data and being characterized by not being accompanied by said substantially constant direct current (DC) offset component, and wherein the step of controlling the operating mode of the equalizer in response to the identification of the direct current (DC) component of said received signal comprises substeps of: determining whether or not said received signal is currently accompanied by said substantially constant direct current (DC) offset component; calculating desired spectral response for said equalizer using at least a portion of said field synchronizing signal as a training signal, in response to it being determined that the direct current (DC) component of said received signal is currently accompanied by said substantially constant direct current (DC) offset component; establishing desired spectral response for said equalizer other than from calculations using at least a portion of said field synchronizing signal as a training signal, in response to it being determined that said received signal is currently unaccompanied by said substantially constant direct current (DC) offset component.