AUDIO SIGNAL LEVEL ESTIMATION IN CAMERAS

摘要

A camera system includes a first microphone, a second microphone, and a microphone controller. The first microphone and the second microphone are configured to capture audio over a time interval to produce a first captured audio signal and a second captured audio signal, respectively. The second captured audio signal is dampened relative to the first captured audio signal by a dampening factor. The microphone controller is configured to store the first captured audio signal in response to a determination that the first captured audio signal does not clip. In response to a determination that the first captured audio signal clips, the microphone controller is configured to identify a gain between the first captured audio signal and the second captured audio signal representative of the dampening factor, amplify the second captured audio signal based on the identified gain, and store the amplified second captured audio signal.

主权项

1. A camera, comprising:
a first microphone; a second microphone, the first microphone and the second microphone configured to capture audio simultaneously to produce a first audio signal and a second audio signal, respectively, and the second audio signal dampened relative to the first audio signal by a dampening factor; and a microphone controller coupled to the first microphone and the second microphone, the microphone controller configured to:
compare a first signal to noise ratio (SNR) of the first audio signal to a second SNR of the second audio signal;in response to a determination that the first SNR is equal to or greater than the second SNR, store the first audio signal; andin response to a determination that the first SNR is less than the second SNR:
identify a gain between the first audio signal and the second audio signal, the gain representing the dampening factor;amplify the second audio signal by the identified gain; andstore the amplified second audio signal.