Synchronizing audio signal sampling in a wireless, digital audio conferencing system

摘要

A digital audio conferencing system has a fixed base station that is in communication with a far end (R.E.) system over a communication network. The base station is associated with a wireless loudspeaker and one or more wireless microphones. The base station operates to receive F.E. audio signals to be played by the wireless loudspeaker, and it operates to remove acoustic echo picked up by the wireless microphones. A first clock controlling F.E. audio signal sampling at the base station, and a second clock controlling audio signal sampling and at a wireless microphone are synchronized to one master, reference clock that controls the operation of the base station. Acoustic echo included in an audio signal picked up by a wireless microphone is removed by AEC functionality running in the base station.

主权项

1. A base station comprising a wireless, digital audio conferencing system operates to derive a local clock from a master clock signal generated by an external network to which it is connected, a method comprising:
receiving the master clock signal at the base station, the master clock signal having a first clock rate; deriving the local clock by the base station modifying the first clock rate of the master clock signal to be a second clock rate, the second clock rate being different than the first clock rate; and using the second clock rate to control the operation of the base station to capture and process multimedia information.