Synchronization of Buffered Data in Multiple Microphones

摘要

First analog signals are received from a first microphone, converted into first digital data and stored in a first buffer. A determination is made as to whether voice activity has occurred when voice activity is determined, a voice activity detect signal is sent to an external processor. The external processor responsively provides an exterior clock signal upon receiving the voice activity detect signal. Second analog signals are received from a second microphone, converted into second digital data and stored in a second buffer. The first digital data in the first buffer is not necessarily synchronized in real time with the second digital data in the second buffer. The first digital data from the first buffer and the second digital data from the second buffer is decimated using the external clock to provide decimated output data, the decimated output data having the first digital data and the second digital data aligned in real time.

主权项

1. A method, the method comprising:
receiving first analog signals from a first microphone, converting the first analog signals into first digital data and storing the first digital data in a first buffer using a first internal clock; receiving a second analog signals from a second microphone according to a second internal clock, converting the second analog signal into second digital data and storing the second digital data in a second buffer; wherein the first digital data in the first buffer is not necessarily synchronized in real time with the second digital data in the second buffer; determining whether voice activity has occurred at a first acoustic activity detect (AAD) module based upon the first digital data, and when voice activity is determined, transmitting a voice activity detect signal to an external processor, the external processor responsively providing an exterior clock signal upon receiving the voice activity detect signal; decimating the first digital data from the first buffer and the second digital data from the second buffer using the external clock to provide decimated output data, the decimated output data having the first digital data and the second digital data aligned in real time.