Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
1997-12-19
2001-02-27
Chin, Stephen (Department: 2734)
Pulse or digital communications
Transmitters
Antinoise or distortion
C375S349000
Reexamination Certificate
active
06195398
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to the field of data communication, and, more particularly, to communicating control data in noisy environmental conditions.
BACKGROUND OF THE INVENTION
Various data communication systems have been developed over the years for communicating data across data communications channels, networks, data lines, or other data links. As illustrated in
FIG. 1
, a persistent problem, however, is to communicate control data or control information from a first data communications device across a channel or data line to a second data communications device and from the second data communications device across the channel or data line to the first data communications device in noisy environmental conditions.
For example, as illustrated in
FIG. 2
, if information is sent across a data line. To have a function ON, then a clock signal is sent on the data line, and to have the function OFF, no signal is sent. In a noisy environment, noise can activate the control function in error.
To address this problem, as illustrated in
FIG. 3
, previous attempts have been made to send or transmit data on 2/3 lines. A first data line is for bit clock data, a second data line is for frame clock data, and a third data line is for control data or information. The data/control information is not correlated to or with the other data lines which are much more sensitive to noise. Increased or similar performance, e.g., little or no interference from the noise, and the required use of fewer data lines, however, remains desirable.
SUMMARY OF THE INVENTION
In view of the foregoing background, the present invention advantageously provides a method and apparatus for providing communication of data in noisy environmental conditions which is less sensitive to noise in the environment such as for applications related to computer networks, modems, control circuitry, or other types of data communication. The present invention also provides a method and apparatus requiring a reduced number of data lines or data channels for communicating data having a high degree of integrity in noisy environments. The present invention additionally provides a method and apparatus for communicating data across two data lines having a correlation between each of the two different signals being transmitted across the respective data lines.
More particularly, a method for communicating data preferably includes communicating a first fixed data signal at a first frequency on a first data communications line and communicating a second data signal at a second frequency on a second data communications line. The second frequency is preferably correlated to the first frequency by a predetermined coefficient so as to define a correlation value between the first and second data signals. For example, the second frequency can be the first frequency divided by the predetermined coefficient. The correlation value is also preferably representative of a predetermined function. The method preferably also includes determining the correlation value responsive to the first and second data signals.
Additionally, this method can also advantageously include communicating a third data signal at the second frequency on the second data communications line. The third data signal is preferably phase shifted from the second data signal. The second frequency is also preferably the first frequency divided by the predetermined coefficient so as to define the same correlation value between the first and third data signals as the correlation value between the first and second data signals. The phase shift of the third data signal can also be representative of a different state of the control function represented by the correlation value.
Another method of communicating data according to the present invention preferably includes transmitting a first data signal at a first frequency on a first data communications channel and transmitting a second data signal at a second frequency on a second data communications channel. The second frequency is preferably correlated to the first frequency by a predetermined coefficient so as to define a correlation value between the first and second data signals. The correlation value preferably represents a predetermined function. The method can also include receiving the first and second data signals and determining the correlation value responsive to the first and second data signals.
This method additionally can advantageously include transmitting a third data signal at the second frequency on the second data communications channel. The third data signal is preferably phase shifted from the second data signal. The second frequency also, for example, can advantageously be the first frequency divided by the predetermined coefficient so as to define the same correlation value between the first and third data signals. The phase shift of the third data signal preferably represents a different state of the predetermined function represented by the correlation value. The method can further include receiving the third data signal and determining the correlation value responsive to the first and third data signals.
Yet another method of coding data according to the present invention preferably includes encoding a first signal at a first frequency and encoding a second signal at a second frequency. The second frequency is preferably correlated to the first frequency by a predetermined coefficient so as to define a correlation value between the first and second data signals. The correlation value preferably represents a predetermined function.
This method can also advantageously include encoding a third signal at the second frequency. The third signal is preferably phase shifted from the second signal. The second frequency also is preferably correlated to the first frequency by the predetermined coefficient so as to define the same correlation value between the first and third signals as the first and second signals. The phase shift of the third signal preferably represents a different state of the predetermined function represented by the correlation value. The method can additionally include determining the correlation value responsive to the first, second, and third signals and determining the phase of the second and third signals responsive to the first, second and third signals.
A data communication apparatus for communicating data according to the present invention preferably includes a first data communication device for communicating data. The first data communication device includes transmitting means for transmitting a first signal at a first frequency, a second signal at a second frequency, and a third signal at the second frequency. The second frequency is preferably correlated to the first frequency by a predetermined coefficient so as to define a correlation value between the first and second signals. The correlation value preferably represents a predetermined function, e.g., a control function desired to be controlled. The third signal is preferably phase shifted from the second signal. The second frequency is also preferably correlated to the first frequency by the predetermined coefficient so as to define a correlation value between the first and third signals. The apparatus also includes a second data communication device responsive to the first data communication device. The second data communications device preferably includes receiving means responsive to the transmitting means of the first data communication device for receiving the first, second, and third signals.
The apparatus of the present invention can also advantageously include the first data communication device further including encoding means for encoding a first fixed data signal at a first frequency on a first data communications line, a second data signal at a second frequency on a second data communications line, and a third data signal at the second frequency on the second data communications line. The phase shift of the third signal also preferably represents a different state of the predetermined function represented b
Chin Stephen
Fan Chieh M.
Galanthay Theodore E.
Jorgenson Lisa K.
Regan Christopher
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