Abstract: A modulated signal (10) is sinusoidal wave signal wherein each half wave cycle carries a digital data value associated with an amount of its amplitude. A positive half wave cycle with an amplitude of M encodes a binary level zero digital data value while a positive half wave cycle with an amplitude of M+x encodes a binary level one digital data value. Similarly, a negative half wave cycle with an amplitude of −M encodes a binary level zero digital data value while a negative half wave cycle with an amplitude of −M−x encodes a binary level one digital data value. The positive and negative half wave cycles may transport dual portions of a channel at the same frequency as a modulated signal (20) for either a dual transmission capability or as a full duplex bidirectional transmit/receive channel.

Abstract: A system and method of implementing a high performance digital bus interface. Digital signals present on a plurality of digital bus signal lines are amplitude encoded into a single signal and coupled to a transmission medium. The encoded signal is received and decoded by a complimentary decoder. The amplitude levels are discriminated and converted into digital symbols, each having a plurality of bits, which are coupled to a second digital bus. Digital signals are amplitude encoded at levels related by powers of two so that no encoding ambiguity is created. In wide data bus implementations, a plurality of encoder/decoders can be used. Bi-directional bus implementations are also taught.