Multi-drop Bus Controller for Low Power High Bandwidth Audio
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Solution Overview
Problem
Existing digital data communication systems fail to meet the requirements of high bandwidth, low power consumption, and low latency, especially in multi-drop bus configurations, which are necessary for modern applications such as adaptive noise cancellation headsets.
Innovation Solution
The implementation of a device controller with a master bus controller for a multi-drop bus, using differential signaling and phase-locked loops to enable high-speed bi-directional communications, with power-saving features like idle bus states and capacitive or inductive drop regulators, allowing multiple devices on a single transmission line while minimizing reflections and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high bandwidth communications are achieved through digital communications link with termination, then signal integrity is satisfactory, but static power consumption in receiver termination is undesirable
Solution Approach 1:
The patent applies periodic action by using clocked serial communication where data is transmitted in periodic clock cycles rather than continuous transmission. The system enables high bandwidth through synchronized periodic data transfers while allowing receiver termination to be disabled during idle periods, thereby reducing static power consumption while maintaining signal integrity during active transmission periods.
2Use of energy by moving object
If data communications take full sample period over digital link, then low power is achieved, but latency is high and bandwidth is reduced
Solution Approach 1:
The patent applies preliminary action by performing data transfers during dedicated time slots before the next audio sampling period begins. The system prepares and transmits data packets in advance during idle periods or at the start of frame periods, enabling high bandwidth utilization without requiring continuous transmission throughout the entire sample period, thus maintaining low power consumption.
3Adaptability or versatility
If multiple devices are connected to transmission line, then device versatility is improved, but signal reflections and interference increase
Solution Approach 1:
The patent applies segmentation by dividing the multi-device transmission line into distinct time slots for each device. The system uses time-division multiplexing where each slave device is assigned specific time windows for data transmission, segmenting the shared bus into isolated communication channels. This eliminates signal reflections and interference between devices while maintaining multi-device support through structured time-slot allocation.
Solution Approach 2:
The patent applies dynamics by implementing dynamic timing calibration where the system automatically adjusts timing parameters for each device based on their specific electrical characteristics and physical positions on the bus. The master device performs calibration sequences that measure signal propagation delays and adjust timing offsets dynamically, ensuring optimal signal quality for each connected device while maintaining overall system reliability.
4Adaptability or versatility
If physical links are extended to meet length requirements, then device adaptability is improved, but signal degradation increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting signaling parameters such as voltage levels, clock frequency, and data rate based on the detected link length and signal quality. The system performs link training sequences that measure signal degradation and automatically selects optimal transmission parameters, enabling reliable communication over extended physical links by adapting to the specific electrical characteristics of each connection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution achieves low power consumption, high bandwidth, and low latency in digital data communications, supporting multiple devices and long link lengths with minimal signal degradation, enabling efficient data transfer in applications like adaptive noise cancellation headsets.
Implementation Method 1
differential signaling is used for communications and one line is terminated in logic high and one line is terminated in logic low to reduce common mode interference
Implementation Method 2
reflections due to mismatches in impedance by inclusion of intermediate signaling nodes are controlled
Implementation Method 3
a phase-locked loop providing a first clock signal for synchronizing communications in accordance with the first communications protocol, a second clock signal for synchronizing communications in accordance with the second communications protocol
Data Source
AI summary
Data bus systems and methods include a device controller coupled to a first interface for digital audio data communications in accordance with a first communications protocol, the device controller including a master bus controller for controlling a multi-drop bus in accordance with a second communications protocol; and a first slave device coupled to the multi-drop bus and configured to transmit and receive digital audio data communications with the device controller in accordance with the second communications protocol. Each transmission line end is terminated using the device attached at one end of the transmission line and by another device attached at the other end and reflections due to mismatches in impedance by inclusion of intermediate signaling nodes are controlled to allow multi-drop device support and high speed signaling. The second communications protocol supports multiple audio data rates using a fixed frame format.