Patent ID: 8861620

Claim:
An apparatus for digitizing the full band of a cable signal, the apparatus comprising: an input for receiving the cable signal; a plurality of tuners configured to receive the cable signal from the input and produce a plurality of frequency segments of the cable signal, wherein each frequency segment covers a portion of the cable signal; a plurality of analog-to-digital converters (ADCs) configured to receive the cable signal from the plurality of tuners and produce an output stream, each ADC coupled to a single tuner of the plurality of tuners, wherein each tuner provides the frequency segment of the cable signal to the ADC; and a digital signal processor (DSP) configured to receive the output stream from the plurality of ADCs, filter one or more channels of the output stream and compensate the one or more channels for in-phase quadrature (I/Q) imbalance, wherein the DSP further comprises: a demultiplexer configured to contain a mapping from the plurality of tuners to a plurality of RF channels; an image rejection filter configured to estimate an in-phase quadrature (IQ) imbalance for each RF channel separately and to compensate for the IQ imbalance in the RF channel; a channel selection filter configured to filter adjacent channels and interfering RF channels for each RF channel; a down converter configured to convert the cable signal into a lower frequency; and a rate converter that converts the down-converted signal into a specified frequency for reception at a demodulator.