Apparatuses and methods to detect and obtain desired audio

摘要

A device and method to detect desired audio includes a ratio calculator. The ratio calculator calculates a ratio between a primary acoustic signal, and a reference acoustic signal. The primary acoustic signal contains desired audio and undesired audio and the reference acoustic signal contains mostly undesired audio, substantially void of undesired audio. A long-term mean value calculator is coupled to the ratio calculator. The long-term mean value calculator maintains an average of the ratio. A comparator is coupled to the ratio calculator and the long-term value calculator. The comparator compares the ratio with the average. Desired audio is detected when the ratio is greater than the average by a threshold amount.

主权项

1. A device to detect desired audio, comprising:
a ratio calculator, the ratio calculator calculates a ratio between a primary acoustic signal, and a reference acoustic signal, the primary acoustic signal contains desired audio and undesired audio and the reference acoustic signal contains mostly undesired audio, substantially void of desired audio: a long-term mean value calculator, the long-term mean value calculator is coupled to the ratio calculator, the long-term mean value calculator maintains a running average of the ratio; and a comparator, the comparator is coupled to the ratio calculator and the long-term value calculator, the comparator compares the ratio with the running average, desired audio is detected when the ratio is greater than the running average by a threshold amount.