Toa Corporation

Ken'ichi Ejima

Koji Moriguchi

Takashi Ogura

Provided is a wireless microphone system comprising a microphone and a wireless receiver, wherein the wireless microphone system is provided with: a normal communication mode in which communication is performed by using a normal unique word (UWN) preset in both the microphone and the wireless receiver devices; a confidential setting mode in which a confidential unique word (UWX) is transmitted without being set in either of said devices; and a confidential communication mode in which communication is performed by both said devices by using the confidential unique word (UWX) set by the confidential setting mode.

Wireless microphone system

A master clock signal source () generates a master clock signal having a frequency equal to N times the bit rate of received data, where N is a positive integer. A modulo-N counter () counts the master clock signal. An edge detecting circuit () detects a transition of the received data from a H level to a L level. A counter () counts the master clock signal and resets the modulo-N counter () if the count counted during a time period in which three edge representative signals occur is 2N. In accordance with the count in the modulo-N counter, a clock generating unitgenerates a clock signal.

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Kobe, Japan

Ken'ichi Ejima