Audio Activation Phrase Detection Bandwidth Optimization
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Solution Overview
Problem
In low-bandwidth networked systems, the detection of activation phrases in audio signals is hindered by the delay and bandwidth inefficiencies caused by transmitting multiple recordings of audio signals for confirmation, leading to potential latency and increased data processing challenges.
Innovation Solution
A two-stage activation phrase detection process where a sensing device initially detects candidate activation phrases and transmits only the first instance to a client device for confirmation, discarding unnecessary recordings if the phrase is identified, and transmitting subsequent instances only if confirmation is needed, thereby optimizing bandwidth usage and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple instances of audio signals are transmitted for confirmation, then the detection reliability of activation phrases is improved, but the network bandwidth consumption increases and latency is introduced
Solution Approach 1:
The patent extracts only the essential audio data needed for activation phrase detection from multiple audio instances, transmitting minimal necessary data to the server for confirmation while discarding redundant information, thereby maintaining detection reliability while reducing bandwidth consumption
Solution Approach 2:
The client device performs preliminary processing and filtering of audio instances before transmission, pre-identifying potential activation phrases and selecting only those instances requiring server confirmation, which reduces the number of transmissions needed and optimizes bandwidth usage
2Reliability
If multiple instances of audio signals are transmitted for confirmation, then the detection reliability of activation phrases is improved, but the latency increases
Solution Approach 1:
The system performs preliminary local analysis of audio instances to identify potential activation phrases before server transmission, pre-filtering candidates to reduce the number of round-trip transmissions required, thereby maintaining detection reliability while minimizing latency
Solution Approach 2:
When the client device confidently identifies an activation phrase through local processing, it skips the confirmation transmission step and directly executes the associated action, bypassing unnecessary network round-trips and reducing latency while maintaining reliability through confidence threshold validation
3Measurement precision
If high-quality audio signals are processed, then the detection accuracy of activation phrases is improved, but the file size increases leading to excessive network traffic
Solution Approach 1:
The patent applies different quality levels to different portions of audio data - high-quality processing is applied only to segments containing potential activation phrases identified through local analysis, while other segments are processed at lower quality or discarded, maintaining detection accuracy for critical regions while reducing overall network traffic
Solution Approach 2:
The system extracts and transmits only the specific audio segments containing potential activation phrases rather than transmitting complete high-quality audio files, removing unnecessary data while preserving the quality and integrity of the critical detection regions
Data Source
AI summary
The present disclosure is generally directed a system to detect activation phrases within input audio signals transmitted over a low-bandwidth network. The system can use a two-stage activation phrase detection process. First a sensing device, which can include a plurality of microphones for detecting an input audio signal, can detect an input audio signal that includes a candidate activation phrase. Second, the sensing device can transmit the recordings of the input audio signal to a client device for confirmation that the input audio signal includes the activation phrase.