Method and apparatus for transmitting data. Digital image data is converted into image data packets, and digital audio data is converted into audio data packets, the packets being transmitted by a spread spectrum-frequency hopping (SS-FH) sending and receiving device. A bi-directional audio ...http://www.google.com.hk/patents/US5838718?utm_source=gb-gplus-share專利 US5838718 - Method and apparatus for transmitting data signals
