| 摘要 |
A DIGITAL METHOD AND APPARATUS MODULATES A STREAM OF DIGITIZED SAMPLES FROM A SOURCE, (202) BY A DIGITAL REPRESENTATION IF A CARRIER (804) TO PROVIDE, FOR EXAMPLE, A 6MHZ BANDWIDTH TELEVISION SIGNAL SELECTIVELY CENTERED EITHER AT 63 MHZ (CHANNEL 3), 69 MHZ (CHANNEL) 4 OR 5038MHZ IF (BASEBAND). MORE PARTICULARLY THE METHOD INCLUDES FIRST RESAMPLING (800) THE STREAM OF DIGITIZED SAMPLES AND THEN MODULATING (802) THE RESAMPLED STREAM OF SAMPLES WITH A REPEATING SHORT SEQUENCE OF COMPLEX VALUES (804), WHICH COMPLEX VALUES REPRESENT A DIGITIZED EXPONENTIAL CARRIER.(FIG. 12)
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