USB Interface Transceiver for Multiplexed Audio and Data
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Solution Overview
Problem
Existing communication interfaces between portable devices and auxiliary devices, such as car kits, are complex and costly due to the need for proprietary interfaces and support for multiple modes of operation, which increases economic and size burdens.
Innovation Solution
A method and apparatus that utilize a 4-wire USB interface with an interface transceiver to inject an interrupt signal, allowing for multiplexed operation between devices, facilitating handsfree operation and data exchange by using an interrupt pulse generator to control mode changes, thereby simplifying and standardizing the interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If proprietary interfaces are used to support multiple modes of operation, then interface functionality and versatility are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies universality by enabling a single standardized USB interface to perform multiple functions (audio transmission, data exchange, mode signaling) that previously required separate proprietary interfaces. The interface transceiver handles different operational modes (audio mode, data mode, mode transition) through a unified physical connection, eliminating the need for multiple specialized connectors and reducing overall system complexity while maintaining versatility.
Solution Approach 2:
The patent utilizes parameter changes by encoding mode information in the electrical characteristics of the USB interface itself. Specifically, the impedance state of the D+ or D- line serves as a parameter that indicates the desired operational mode to the remote device. By changing the impedance parameter of existing signal lines, the system can signal mode transitions without adding dedicated control wires or complex protocols.
2Adaptability or versatility
If multiple modes of operation are supported through standardized interfaces, then interoperability is improved, but interface complexity and economic burden increase
Solution Approach 1:
The patent achieves universality by implementing multi-functional capability in the interface transceiver that handles audio, data, and mode signaling through a single USB connection. This eliminates the need for separate proprietary connectors and associated manufacturing complexity, allowing standard USB components to be used across different device types while maintaining support for multiple operational modes.
Solution Approach 2:
The patent applies self-service by enabling the interface itself to carry mode indication information through its existing signal lines. The impedance state of the USB data lines automatically conveys mode information to the remote device without requiring separate control signals or additional processing infrastructure. This self-servicing approach reduces manufacturing cost by utilizing existing infrastructure for multiple purposes.
3Adaptability or versatility
If interrupt signals are injected into multiplexed paths for mode signaling, then mode transition capability is improved, but signal path complexity increases
Solution Approach 1:
The patent applies merging by combining mode signaling functionality with the existing audio and data signal paths. The interrupt signal is injected into the same physical USB data lines that carry audio and data, rather than requiring a separate dedicated control line. This consolidation of multiple functions into shared signal paths reduces the overall number of wires and simplifies the physical interface while maintaining full mode transition capability.
Solution Approach 2:
The patent uses the USB data lines as an intermediary to carry both data/audio signals and mode indication signals. By injecting the interrupt signal into these existing lines, the system leverages the established communication pathway for mode transitions. The interface transceiver acts as an intermediary that manages the multiplexing of different signal types through the same physical medium, simplifying the overall signal architecture.
Data Source
AI summary
A system comprises a pulse generator 615 configured to provide a control pulse a transmission gate 603 configured to interrupt a path between a communication device 307 and an auxiliary device 303 during the control pulse; and a pulse transmitter 607 responsive to the control pulse and configured to inject an interrupt pulse in the path while the path is interrupted. A corresponding method of providing an interrupt signal in an audio path between a source and a sink includes interrupting an audio path between the source and the sink, injecting an interrupt pulse in the audio path while the audio path is interrupted, and then reconnecting the audio path.