Bluetooth Audio Link Configuration for Voice Command Detection
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Solution Overview
Problem
Bluetooth audio devices face challenges in efficiently detecting user passphrases and voice commands while maintaining low latency and reducing power consumption, as existing methods often require high power to maintain a low-latency link configuration during passphrase detection.
Innovation Solution
Implementing a communication scheme that switches between two Bluetooth link configurations: a relaxed latency configuration during passphrase detection to conserve power and a low-latency configuration during voice command detection, using null-data packets to maintain the link during silence and reconfiguring the link based on the presence of a voice signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a low-latency link configuration is maintained during passphrase detection, then voice command detection accuracy is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the Bluetooth link configuration changeable based on operational mode. The system dynamically switches between a first link configuration (relaxed latency) for passphrase detection and a second link configuration (low latency) for voice command detection. This resolves the contradiction by adapting the link configuration to the current task requirements rather than maintaining a fixed configuration, thereby achieving accurate voice command detection only when needed while conserving power during passphrase detection.
Solution Approach 2:
The patent changes the latency parameter of the Bluetooth link configuration based on the detection phase. During passphrase detection, a relaxed latency parameter is used to reduce power consumption. When voice command detection is required, the latency parameter is adjusted to be lower for accurate and timely detection. This parameter adaptation resolves the contradiction by optimizing the latency-power tradeoff according to the current operational requirements.
2Use of energy by moving object
If a relaxed latency configuration is used during passphrase detection, then power consumption is reduced, but voice command detection latency increases
Solution Approach 1:
The system dynamically adjusts the link configuration based on the detection phase. During passphrase detection, it uses a relaxed latency configuration to save power. Upon detecting that voice commands need to be detected, it switches to a low-latency configuration, thereby minimizing detection latency only when necessary. This dynamic adaptation resolves the contradiction between power consumption and detection latency.
Solution Approach 2:
The system performs preliminary action by maintaining the Bluetooth link in a relaxed state during passphrase detection, then quickly reconfigures it to low-latency mode when voice commands are expected. This preliminary preparation and rapid reconfiguration approach ensures that power is saved during the longer passphrase detection phase while being ready to quickly detect voice commands when they occur.
3Measurement precision
If continuous audio monitoring is performed for voice signal detection, then voice command detection accuracy is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic action by performing audio input monitoring at specific intervals and only during relevant phases. The system monitors audio input to detect the user passphrase, and upon detection, triggers voice command detection. This periodic monitoring approach, rather than continuous monitoring, reduces power consumption while maintaining accurate detection by focusing computational resources on critical detection moments.
Solution Approach 2:
The system uses the audio data already being captured for passphrase detection to also perform voice command detection when appropriate. By leveraging the existing audio monitoring infrastructure and only activating full voice command detection processing when the passphrase is detected, the system achieves accurate voice command detection without the additional power cost of continuous dedicated voice monitoring.
Data Source
AI summary
For example, a BT audio device may be configured to, during a passphrase-detection mode, monitor an audio input of the BT audio device to detect whether the audio input includes a voice signal, the passphrase-detection mode configured for detection of a predefined user passphrase to indicate a voice command to be provided from a user of the BT audio device; based on a determination that the audio input does not include the voice signal, transmit one or more null-data packets to a BT device over a BT wireless communication link between the BT audio device and the BT device; and, based on a determination that the audio input includes the voice signal, transmit one or more data packets to the BT device over the BT wireless communication link, wherein a payload of the one or more data packets includes audio data based on the audio input.