Channel equalizer for digital television receiver having an initial coefficient storage unit

A channel equalizer for a digital television receiver which receives a digital input signal, comprising:

• FIR filtering means for filtering the received digital input signal;
• error detection means for detecting a difference between the received digital input signal and an output signal from said FIR filtering means;
• coefficient update calculation means for updating a filtering coefficient in response to the received digital input signal, an output signal from initial coefficient storage means, and an output signal from said error detection means by converging the filtering coefficient on an optimum value, and outputting the updated filtering coefficient to said FIR filtering means;
• and
• the initial coefficient storage means for storing a predetermined coefficient for all channels of the digital television receiver, outputting the predetermined coefficient as the output signal of the initial coefficient storage means to said coefficient update calculation means when any one of the channels of the digital television receiver is selected for a first time so that the predetermined coefficient is used as an initial filtering value for said coefficient update calculation means to update the filtering coefficient with the received digital input signal and the output signal from said error detections means, storing the converged filtering coefficient generated from said coefficient update calculation means using the predetermined coefficient, and outputting the stored filtering coefficient to said coefficient update calculation means as the output signal of the initial coefficient storage means when said one of the channels is selected again, whereby the converged filtering coefficient is used as the initial filtering value for said coefficient update calculation means to update the filtering coefficient when said one of the channels is selected again.

A channel equalizer for a digital television receiver which receives a digital input signal, comprising:

• feed forward FIR filtering means for filtering the received digital input signal;
• slicing means for slicing an output signal of the channel equalizer;
• feedback FIR filtering means for filtering an output signal from said slicing means;
• addition means for adding an output signal from said feedforward FIR filtering means to an output signal from said feedback FIR filtering means to provide the output signal of the channel equalizer;
• error detection means for detecting a difference between the output signal from said addition means and the output signal from said slicing means to detect an error between the input signal and the output signal of the channel equalizer;
• coefficient update calculation means for updating a filtering coefficient in response to the digital input signal, an output signal from initial coefficient storage means, an output signal from said error detection means and an output signal from said slicing means so that the filtering can converge on an optimum value and outputting the updated filtering coefficient to said feedforward FIR filtering means and said feedback FIR filtering means;
• and
• the initial coefficient storage means for storing a predetermined coefficient for all channels of the digital television receiver, outputting the predetermined coefficient as the output signal of the initial coefficient storage means to said coefficient update calculation means when any one of the channels of the digital television receiver is selected for a first time so that the predetermined coefficient is used as an initial filtering value for said coefficient update calculation means to update the filtering coefficient with the digital input signal, the output signal from said error detection means and the output signal from said slicing means, storing the converged filtering coefficient generated from said coefficient update calculation means using the predetermined coefficient, and outputting the stored filtering coefficient to said coefficient update calculation means as the output signal of the initial coefficient storage means when said one of the channels is selected again, whereby the converged filtering coefficient is used as the initial filtering value for said coefficient update calculation means to update the filtering coefficient when said one of the channels is selected again.