Vehicle Wake-Up Audio Timing for Reliable Acoustic Event Detection
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Solution Overview
Problem
Existing systems face challenges in accurately detecting acoustic events for digital personal assistants, particularly in noisy environments like vehicles, due to difficulties in timing the transmission of audio data to remote computing devices and processing long periods of silence, leading to unreliable detection.
Innovation Solution
A control system for vehicles that includes a wake-up engine to detect acoustic events, determine timestamps, and communicate accurate indications of event times, using buffers to store and manage audio data for seamless transmission to remote systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If first-pass local detection is performed on the device, then detection accuracy is improved, but timing accuracy for providing audio data to remote computing device deteriorates
Solution Approach 1:
The system performs first-pass local detection of the acoustic event before providing audio data to the remote computing device. The wake-up engine analyzes audio data locally to detect the acoustic event, and only then initiates the process of providing the corresponding audio data to the remote device. This preliminary action ensures that the audio data is provided with accurate timing relative to the detection event, resolving the timing accuracy issue while maintaining detection accuracy through local processing.
2Measurement precision
If audio data is provided to remote computing device, then detection accuracy is improved, but data transmission reliability deteriorates due to lost packets or samples
Solution Approach 1:
The system performs first-pass local detection of the acoustic event before providing audio data to the remote computing device. By detecting the acoustic event locally with the wake-up engine, the system can precisely identify which audio data corresponds to the acoustic event and provide only that specific portion to the remote device. This approach improves data transmission reliability by avoiding the need to transmit large amounts of audio data that might be subject to packet loss, while still achieving accurate detection through the combination of local detection and remote verification.
3Productivity
If local device processes long periods of audio data, then acoustic event detection is possible, but timing reliability deteriorates
Solution Approach 1:
The system extracts and processes only the specific portion of audio data that contains the acoustic event, rather than processing entire long periods of audio data. The wake-up engine continuously monitors audio data and identifies the precise moment when an acoustic event occurs. When an acoustic event is detected, the system extracts the corresponding audio data segment and provides it to the remote computing device. This extraction approach maintains detection capability while improving timing reliability by focusing processing resources on relevant audio segments rather than processing all audio data continuously.
Data Source
AI summary
A control system for a vehicle includes input means, memory means, and processing means, wherein a wake-up engine is arranged to determine a timestamp in dependence on a predetermined event associated with activation of the wake-up engine, analyse a received audio signal to detect an acoustic event indicative of a wake-up signal for a client application, provide an indication of the timestamp and an indication of the detection of the acoustic event comprising an indication of a time of a predetermined point in the audio signal associated with the acoustic event, wherein the indication is relative to the timestamp, wherein the client application is arranged to receive the indication of the timestamp and the indication of the detection, determine a current timestamp in dependence on receiving the indication of the detection, and determine, in dependence on the current timestamp, the first timestamp, and the indication of the time of the predetermined point in the audio signal, a position of the audio signal in the first buffer for initiating an audio session.