Daisy-Chain Speaker Addressing With Local Reference Voltages
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Solution Overview
Problem
Individual testing of passive speakers in a daisy chain configuration is challenging due to the lack of local processing units, complicating the implementation and increasing costs.
Innovation Solution
A speaker system with a main unit and passive units connected via control, reference, and audio signals, utilizing voltage regulation and comparators to enable individual testing by comparing control voltages to thresholds, allowing centralized control and feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If passive speakers are kept simple without local processing units, then the bill of material is minimized and cost is reduced, but individual testing of the speakers becomes very challenging
Solution Approach 1:
A voltage regulation unit is introduced as an intermediary component on the reference voltage signal connection between passive units. This unit enables individual testing by providing a controllable voltage signal that can activate specific speakers in the daisy chain without requiring complex processing units within the speakers themselves
Solution Approach 2:
The system implements feedback by monitoring the reference voltage signal connection to detect which passive unit is currently activated by the voltage regulation unit. This allows the main unit to identify and test individual speakers by observing the feedback signal from the daisy chain
2Quantity of substance
If multiple speakers are connected in a daisy chain using a single cable, then the total cable length and quantity are minimized, but individual control and testing of each speaker becomes more difficult
Solution Approach 1:
The reference voltage signal connection is segmented into multiple tap points, one for each passive unit in the daisy chain. Each tap point can be independently activated by the voltage regulation unit, allowing individual control and testing of each speaker while maintaining the physical daisy chain cable structure
Solution Approach 2:
The voltage regulation unit dynamically switches which tap point on the reference voltage signal connection receives the activation signal. This dynamic control allows any speaker in the chain to be individually activated or deactivated, providing flexible individual control without requiring separate cables for each speaker
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
Enables cost-effective individual testing of passive speakers without complex components, maintaining simplicity and reducing the need for additional equipment.
Implementation Method 1
a voltage regulation unit between each of the plurality of passive units on the reference voltage signal connection, wherein each voltage regulation unit is adapted to provide a local reference voltage to each passive unit
Implementation Method 2
a comparator unit configured to compare the control voltage to a first voltage threshold and a second voltage threshold generated from the local reference voltage to generate an audio enable signal
Data Source
AI summary
A speaker system comprises a main unit and passive units connected by control voltage signal, reference voltage signal and audio signal connections to form a daisy chain. The main unit generates a control voltage through the control voltage signal connection; a reference voltage through the reference voltage signal connection; and an audio signal through the audio signal connection. The system further comprises a voltage regulation unit between passive units on the reference voltage signal connection; each voltage regulation unit providing a local reference voltage to each passive unit, wherein the local reference voltages to the passive units gradually increase or decrease between subsequent passive units along the daisy chain. Each passive unit comprises: a speaker; a comparator unit for comparing the control voltage to first and second voltage thresholds from the local reference voltage to generate an audio enable signal enabling the speaker unit to play the audio signal.