Patent ID: 9204232
Filing Date: 2015-12-01
Classification: G09B,G10L,H04R

Abstract:
1. A method of identifying an appropriate wireless communication channel in an audio broadcasting system that includes an audio transmitter and a plurality of audio receiving devices, the audio transmitter including a microphone and a wireless transmitter for transmitting on an unknown radio channel among a predefined number of possible transmission channels an electric signal generated by the microphone in response to receiving an audio input signal, each of the audio receiving devices including a wireless receiver for receiving the electric signal on the unknown radio channel selected among the predefined number of possible transmission channels, and a microphone for picking up a sound in the environment of the audio receiving device, and for converting the sound to an electric input signal, wherein the method comprises: receiving the audio input signal at the microphone of the audio transmitter and outputting the electric signal; transmitting the electric signal by the wireless transmitter of the audio transmitter; receiving the audio input signal or an audio signal derived from the audio input signal at the microphone of each audio receiving device; selecting a channel as a candidate of the unknown radio channel in the wireless receiver of each audio receiving device among said predefined number of possible transmission channels; receiving the electric signal at the wireless receiver of each audio receiving device using the selected channel; analyzing in each audio receiving device the electric signal received by the wireless receiver via the selected channel and the signal picked up by the microphone of the audio receiving device; determining in each audio receiving device whether a predefined criterion concerning a degree of similarity of the signal received by the wireless receiver and the signal picked up by the microphone is fulfilled; keeping the selected channel as the receiving channel, if said predefined criterion is fulfilled; and selecting another channel from among said predefined number of possible transmission channels as the candidate of the unknown radio channel, if said predefined criterion is not fulfilled.