Two-Wire Audio Bus for Signal Integrity and Wiring Reduction
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Solution Overview
Problem
Vehicle audio systems face challenges in efficiently transmitting and managing audio signals, enable signals, and clip detect signals between interconnected audio circuits, often resulting in signal distortion and potential speaker damage due to the limitations of traditional wiring configurations.
Innovation Solution
A two-wire bi-directional multi-node communication bus system that transmits audio signals, enable signals, and clip detect signals, utilizing two-wire communication circuits with processors and signal converters to adjust signal amplitudes and manage signal transmission, allowing for daisy-chaining of audio circuits and reducing wiring costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate wires are used to interconnect audio circuits for transmitting audio signals and control signals, then signal transmission reliability is improved, but device complexity and wiring cost increase
Solution Approach 1:
The patent combines multiple signal transmission functions (audio signal, enable signal, clip detect signal) into a single wired connection between audio circuits. This merging approach reduces the number of separate wires needed while maintaining reliable signal transmission through a multi-protocol communication interface that can handle different signal types over the same physical connection.
Solution Approach 2:
The wired connection between audio circuits is designed to serve multiple functions simultaneously - transmitting audio signals, enable signals, and clip detect signals. This universal interface allows a single connection to perform what previously required multiple dedicated wires, reducing overall system complexity while maintaining transmission reliability.
2Power
If amplifier outputs audio signal at maximum amplitude limit, then power output is improved, but speaker damage risk increases due to clipping
Solution Approach 1:
The system implements feedback by having the amplifier transmit clip detect signals back to the audio circuit when the maximum amplitude limit is reached. This feedback mechanism allows the audio circuit to monitor amplifier output levels and adjust accordingly, preventing sustained clipping that could damage the speaker while still allowing the amplifier to operate at maximum power output when conditions permit.
Solution Approach 2:
The system performs preliminary action by detecting and signaling clipping conditions before they cause permanent speaker damage. The clip detect signal provides early warning that allows the audio circuit to take preventive measures, such as reducing output amplitude or activating protection modes, thereby protecting the speaker while allowing the amplifier to maintain high power output within safe operating limits.
3Reliability
If dedicated wiring is used for each signal type between audio circuits, then signal interference is reduced, but manufacturing cost increases
Solution Approach 1:
The patent merges multiple dedicated wiring requirements into a single multi-functional connection. Instead of using separate wires for audio signals, enable signals, and clip detect signals, the system transmits all these different signal types over one wired connection, significantly reducing wiring cost and manufacturing complexity while maintaining signal integrity through proper protocol management.
Solution Approach 2:
The wired connection is designed as a universal interface that can handle multiple signal types simultaneously or sequentially. This multi-functional approach eliminates the need for separate dedicated wires for each signal type, reducing manufacturing costs while maintaining signal integrity through intelligent signal management and protocol differentiation within the single connection.
Data Source
AI summary
A two-wire communication system includes a first audio circuit, and a second audio circuit electrically connected to the first audio circuit via a two-wire bi-directional multi-node communication bus. The communication connects the first audio circuit to the second audio circuit wherein an audio signal, an enable signal, and a clip detect signal are transmitted over the bus.