Patent ID: 11948561
Assignee: APPLE INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 7:
8. The signal processing method of claim 1, wherein the microphone time interval is a first microphone time interval, the portion of the VAD signal is a first portion of the VAD signal, and the portion of the accelerometer signal is a first portion of the accelerometer signal, wherein the entire key-phrase is detected within the first microphone time interval, wherein the method further comprises:
processing the microphone signal to detect the entire key-phrase within a second microphone time interval of the microphone signal, wherein the second microphone time interval is shorter than the first microphone time interval;
retrieving a second portion of the VAD signal from the buffer that was generated from a second portion of the accelerometer signal that is within the second microphone time interval;
responsive to determining that the second portion of the VAD signal indicates that the entire key-phrase is spoken by the wearer of the headphone, triggering the VPA.