Analog TV signal receiving circuit for reducing signal distortion using equalizer configuring method

An analog television (TV) signal receiving circuit capable of reducing signal distortion during receiving, comprising:

• a tuner, for receiving an analog radio frequency (RF) TV signal to generate an analog frequency down conversion signal;
• an analog-to-digital converter (ADC), for performing analog-to-digital conversion on the analog frequency down conversion signal to generate a digital frequency down conversion signal;
• a demodulator, comprising:
• a front-end circuit, for generating a digital demodulated signal according to the digital frequency down conversion signal;
• and
• an equalizer, for adjusting the digital demodulated signal to generate a digital receiving signal, being associated with a plurality of correction coefficients that are generated according to a predetermined rule;
• and
• an equalizer coefficient configuration apparatus comprising:
• an analog TV signal generator, for providing a simulation analog TV signal;
• a reference signal generator, for generating a digital reference signal according to the simulation analog TV signal;
• a modulator, coupled to the tuner, for generating a simulation analog RF TV signal according to the simulation analog TV signal, and transmitting the simulation analog RF TV signal to the tuner, with the simulation analog RF TV signal being processed via the tuner, the ADC and the demodulator to generate a simulation digital receiving signal;
• and
• an correction coefficient configuration circuit, for generating the plurality of correction coefficients according to the predetermined rule, the digital reference signal, and the simulation digital receiving signal.

A method for configuring an equalizer, the equalizer applied to an analog television (TV) signal receiving circuit, the method comprising:

• providing an analog radio frequency (RF) TV signal;
• generating an analog frequency down conversion signal according to the analog RF TV signal;
• generating a digital frequency down conversion signal according to the analog frequency down conversion signal;
• generating a digital reference signal according to a simulation analog TV signal generated by an analog TV signal generator;
• generating a simulation analog RF TV signal according to the simulation analog TV signal;
• generating a simulation receiving signal according to the simulation analog RF TV signal;
• generating a digital demodulated signal according to the digital frequency down conversion signal via the analog TV signal receiving circuit;
• generating a digital receiving signal according to the digital demodulated signal via the equalizer, with the equalizer comprising a plurality of correction coefficients;
• and
• configuring the plurality of correction coefficients of the equalizer according to a predetermined rule, the digital reference signal, and the simulation receiving signal.