Voice Activity Detection Power Mode Switching
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Solution Overview
Problem
Voice activity detection devices with master and slave processors face high power consumption due to the inability to switch memory to a low-power mode and the need for both processors to remain active during standby periods, leading to increased system costs.
Innovation Solution
A voice activity detection device with an audio processing circuit, a first memory, and a processor that operates in a low-power mode initially, switching to a higher power mode only upon receiving an interrupt signal to determine if audio data contains a human voice signal, thereby reducing overall power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a master processor and a slave processor are used to detect voice instructions, then voice activity detection capability is improved, but power consumption increases and system cost increases
Solution Approach 1:
The patent segments the processor functionality into two distinct modes: a first mode for low-power operation during standby, and a second mode for full voice activity detection when needed. This segmentation allows the system to achieve reliable voice detection capability only when necessary, while minimizing power consumption during idle periods by operating in the low-power first mode.
2Adaptability or versatility
If the master processor and slave processor access the same memory, then data sharing is improved, but the memory cannot switch to low-power mode and power consumption increases
Solution Approach 1:
The patent implements dynamic operation modes for the memory, allowing it to switch between an active mode (second mode) when data sharing and voice detection are needed, and a low-power mode (first mode) during standby periods. This dynamic switching capability enables the memory to maintain adaptability for data sharing when required while significantly reducing power consumption during idle times.
3Speed
If either the master processor or slave processor remains active during standby, then response time is improved, but power consumption increases
Solution Approach 1:
The patent employs periodic action by switching between operational states: during standby periods, the system operates in the low-power first mode with reduced responsiveness, and upon detecting a wake event or interrupt, it transitions to the active second mode for full voice activity detection. This periodic switching between states allows the system to minimize power consumption during extended idle periods while maintaining the capability for rapid response when voice activity occurs.
Data Source
AI summary
A voice activity detection device includes an audio processing circuit, a first memory, and a processor. The audio processing circuit processes an audio signal from an audio generator circuit to generate first audio data. The first memory stores the first audio data and a first program code. The processor executes the first program code to operate in a first mode, and is switched from operating in the first mode to operating in a second mode in response to an interrupt signal from the audio generator circuit, in order to determine whether the first audio data stored in the first memory includes a human voice signal, wherein power consumption of the processor operating in the first mode is lower than that in the second mode.