Two-wire communication systems and applications

Vehicle equipment with low-latency noise cancellation capability, comprising:

• a speaker;
• and
• a node transceiver, including:
• upstream transceiver circuitry to receive a first signal transmitted over two upstream wires of a two-wire bus from an upstream equipment and to provide a second signal over the two upstream wires of the two-wire bus to the upstream equipment;
• clock circuitry to generate a clock signal at the node transceiver based on a preamble of a synchronization control frame in the first signal, wherein timing of the receipt and provision of signals over the two-wire bus by the node transceiver is based on the clock signal;
• power circuitry to receive a voltage bias between the two upstream wires of the two-wire bus from the upstream equipment;
• and
• interface circuitry to communicate with the speaker.

Vehicle equipment with road noise cancellation capability, comprising:

• a microphone, wherein the microphone is to detect road noise;
• and
• a node transceiver, including:
• upstream transceiver circuitry to receive a first signal transmitted over two upstream wires of a two-wire bus from an upstream equipment and to provide a second signal over the two upstream wires of the two-wire bus to the upstream equipment;
• clock circuitry to generate a clock signal at the node transceiver based on a preamble of a synchronization control frame in the first signal, wherein timing of the receipt and provision of signals over the two-wire bus by the node transceiver is based on the clock signal;
• power circuitry to receive a voltage bias between the two upstream wires of the two-wire bus from the upstream equipment;
• and
• interface circuitry to communicate with the microphone.