| 摘要 |
A receiver for processing a VSB modulated signal containing terrestrial broadcast high definition television information and a pilot component includes an input analog-to-digital converter (19) for producing a datastream which is oversampled at twice the received symbol rate, and a digital demodulator (22) with a data reduction network in a phase control loop. A segment sync detector (24) uses an abbreviated correlation reference pattern to recover a twice symbol rate sampling clock for the digital converter (19). A DC offset associated with the pilot component is removed (26) from the demodulated signal before it is applied to an NTSC interference detection network (30). The interference detection network (30) includes a comb filter network responsive to a twice symbol rate sampled data datastream, and exhibits a sample delay dimensioned to avoid aliasing in the combed frequency spectrum, thereby increasing the effectiveness of NTSC co-channel interference detection. |
