Patent ID: 11875779
Assignee: REALTEK SEMICONDUCTOR CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 9:
10. A voice activity detection (VAD) method, comprising following steps:
receiving and processing an audio input signal and thereby generating an environment detection result, wherein the step for generating the environment detection result includes:
generating M processed signal(s) of each of L frame(s) according to the audio input signal, wherein the M processed signal(s) are M frequency band signal(s) or M frequency domain signal(s), the M is a positive integer, and the L is a frame number;
calculating according to the M processed signal(s) of each of the L frame(s) and thereby generating X energy variation value(s) of the L frame(s), wherein the X is equal to a product of the M and the L, each of the X energy variation value(s) is generated by comparing one of X energy correlation value(s) with an energy threshold, and each of the X energy correlation value(s) is a ratio of one of X short-term energy value(s) to a corresponding one of X long-term energy value(s); and
processing the X energy variation value(s) to generate L energy variation detection value(s), then comparing each of the L energy variation detection value(s) with a variation threshold to generate L comparison result(s), and then generating the environment detection result according to the L comparison result(s); and

selecting one of multiple VAD results as a select VAD result according to the environment detection result, or selecting one of multiple VAD algorithms as an applicable VAD algorithm according to the environment detection result and then generating the select VAD result according to the applicable VAD algorithm,
wherein the multiple VAD results are generated with the multiple VAD algorithms respectively.