A transmit-only Bluetooth-compatible apparatus is described comprising: a protocol stack compatible with the Bluetooth protocol standard, the protocol stack including selected portions of the Bluetooth protocol used only for transmitting data; and a transceiver communicatively coupled to the protocol...http://www.google.com.hk/patents/US7231451?utm_source=gb-gplus-share專利 US7231451 - Transmit-only and receive-only Bluetooth apparatus and method
