Data encoding strategy to reduce selected frequency...

Details Data encoding strategy to reduce selected frequency... Data encoding strategy to reduce selected frequency...

2002-01-30

2003-03-25

Tokar, Michael (Department: 2819)

Coded data generation or conversion

Digital code to digital code converters

Coding by table look-up techniques

C341S058000, C341S059000

Reexamination Certificate

active

06538586

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to the field of data communication. More specifically, the present invention relates to methods and systems for reducing selected frequency components in binary data streams.
BACKGROUND
As clock rates of new system bus technologies such as third generation I/O (3GIO) rise due to increasing performance demands, more of the energy in the information passed on the data bus is located in frequency bands that have until now been occupied primarily by wireless technologies.
Although signal on a “wired” data bus is not purposefully transmitted in the typical radio frequency (RF) sense, some of this energy is broadcast as RF noise and may interfere with sensitive RF devices in close proximity. This problem may become an issue in mobile computer systems that are to incorporate both high-speed I/O systems and integrated wireless devices on the same platform.
FIG. 1
is a block diagram illustrating one example of a prior art mobile computer system. The system
10
includes a memory controller
105
that manages data flowing between a central processing unit (CPU)
100
, memory
110
, and wireless device
120
(e.g., RF device). The wireless device
120
includes an antenna
125
. When the system
10
incorporates high-speed I/O systems and integrated wireless devices, undesired coupling, via several paths, is expected between signals on buses
101
,
111
, and
115
and the wireless device
120
, causing interference that will reduce maximum throughput of the wireless device
120
. For example, data transmission on the data buses
101
,
111
and
115
may cause interference to the signal received by the antenna
125
. Since the bus
115
is directly connected to the wireless device
120
, it may also cause interference to the wireless device
120
. Other interferences to the wireless device
120
may be caused by power plane coupling, waveguide coupling through the motherboard, etc.


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