Acoustic Receiver Idle Mode Sampling for Power Reduction
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Solution Overview
Problem
The high sampling rates required for ultrasound data processing in electronic pointing devices lead to increased power consumption and CPU utilization, posing a challenge for battery-efficient operation in mobile devices.
Innovation Solution
Implementing an acoustic system that operates in a power-efficient idle mode with a lower sampling rate, allowing for wake-up signals to switch to full operational mode only when needed, thereby reducing unnecessary power usage and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high sampling rate is used for ultrasound data processing, then measurement precision is improved, but use of energy increases
Solution Approach 1:
The system dynamically adjusts the sampling rate based on operational state. During idle mode, a lower sampling rate is used to conserve energy, while during active ultrasound processing, the sampling rate increases to maintain measurement precision. This dynamic adaptation resolves the contradiction by making the sampling rate flexible rather than fixed.
Solution Approach 2:
The system employs periodic wake-up signals that trigger temporary high-rate sampling only when needed. Between these periodic wake-up events, the system operates in low-power idle mode with reduced sampling. This periodic activation pattern allows the system to maintain measurement capability while significantly reducing average power consumption.
2Measurement precision
If high sampling rate is used for ultrasound data processing, then measurement precision is improved, but productivity is worsened due to increased CPU utilization
Solution Approach 1:
The CPU dynamically adjusts its processing intensity and sampling rate based on system state. During idle periods, CPU utilization is minimized by operating at lower sampling rates. When ultrasound processing is required, the CPU activates at full capacity to maintain precision. This dynamic CPU management resolves the contradiction between measurement precision and productivity.
Solution Approach 2:
The system uses periodic wake-up signals to trigger high-CPU utilization only when necessary for ultrasound processing. Between these periodic events, the CPU operates in a low-utilization idle state. This periodic activation pattern maintains measurement precision when needed while improving overall productivity by reducing average CPU utilization.
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 approach significantly reduces power consumption by minimizing sampling and processing during idle mode while ensuring quick transition to full operational mode when required, thus preserving battery life in mobile devices.
Implementation Method 1
an acoustic receiver device... receiving a wake-up signal from an acoustic transmitter device
Data Source
AI summary
An acoustic system, which may be ultrasonic, operates in a power efficient idle mode thereby reducing the power consumption required by high frequency sampling and processing. While in idle mode, an acoustic receiver device operates with an idle sampling rate that is lower than the full sampling rate used during full operational mode, but is capable of receiving a wake-up signal from the associated acoustic transmitter. When the wake-up signal is received, the acoustic receiver switches to full operational mode by increasing the sampling rate and enables full processing. The acoustic system may be used in, e.g., an ultrasonic pointing device, location beacons, in peer-to-peer communications between devices, as well as gesture detection.