| US 7,559,076 B2 | ||
| Sample rate reduction in data communication receivers | ||
| Tommy Yu, Orange, Calif. (US); Steven Jaffe, Irvine, Calif. (US); and Stephen Edward Krafft, Los Angeles, Calif. (US) | ||
| Assigned to Broadcom Corporation, Irvine, Calif. (US) | ||
| Filed on Jun. 28, 2002, as Appl. No. 10/184,770. | ||
| Claims priority of provisional application 60/381496, filed on May 17, 2002. | ||
| Claims priority of provisional application 60/381497, filed on May 17, 2002. | ||
| Prior Publication US 2004/0003408 A1, Jan. 01, 2004 | ||
| Int. Cl. H04N 5/445 (2006.01) | ||
| U.S. Cl. 725—85 [725/67; 725/68; 725/127; 725/151] | 35 Claims |
| 1. A communication receiver, comprising:
an analog to digital converter that is operable to digitally sample a received analog signal to generate a digital signal;
an up-sampler, communicatively coupled to the analog to digital converter, that is operable to increase a sample rate of the
digital signal thereby generating an over-sampled digital data stream;
an interpolation filter, communicatively coupled to the up-sampler, that is operable to remove a spectral repeat from the
over-sampled digital data stream; and
a variable interpolation/decimation filter, communicatively coupled to the interpolation filter, that is operable to recover
a transmitted symbol from the over-sampled digital data stream; and wherein:
the analog to digital converter being clocked at a first frequency that is greater than twice a highest frequency component
in the received analog signal and that is less than a second frequency at which the up-sampler is clocked; and
up sampling, as performed by the up-sampler, is performed by a factor corresponding to a reduction in the first frequency
at which the analog to digital converter being clocked as compared to the second frequency at which the up-sampler is clocked.
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