Coded data generation or conversion – Digital code to digital code converters – To or from multi-level codes
Patent
1997-06-25
1999-10-19
Williams, Howard L.
Coded data generation or conversion
Digital code to digital code converters
To or from multi-level codes
H03M 520
Patent
active
059696486
ABSTRACT:
An apparatus and method enables inputs based on a quaternary encoding having high, pulled-up, pulled down and low signal values. The high and low values can be derived from low impedance connections to high and low potential sources, respectively, and the pulled-up and pulled-down signal values can be derived from higher impedance connections to the high and low potential sources, respectively. Discrimination of the first and second levels is performed in two phases. In a first phase a signal level at an input is detected. In a second phase the input is driven towards the inverse of the level detected in the first phase and the level is detected once more. A change in level indicates a high impedance connection to the potential source corresponding to the signal level detected in the first phase. No change indicates a low impedance connection to the potential source corresponding to the signal level detected in the first phase. In this manner four input levels for an input can be discriminated using binary level discriminating circuitry.
REFERENCES:
patent: 4016483 (1977-04-01), Rudin
patent: 4373152 (1983-02-01), Jacobsthal
patent: 4408135 (1983-10-01), Yuyama et al.
Weiss, Binary-Quaternary Encoder-Decoder, IBM Technical Disclosure Bulletin vol. 12, No. 1, Jun. 1989 p. 22.
Sun Microsystems Inc.
Williams Howard L.
LandOfFree
Quaternary signal encoding does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Quaternary signal encoding, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quaternary signal encoding will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2061686