Je vous poste une ( infime ) partie du brevet ( en anglais ). C´est la section qui décrit les images.
A défaut de les voir, nous pouvons tout de même lire le descriptif qu´il en ai fait .
"The video and audio are preferably transmitted as digital data via a wireless communication link. One convenient band for such transmissions is the Industry, Science and Medical (ISM) band that includes frequencies from 2.4 to 2.488 GHz, although the present invention is not limited in this respect. The video and audio are modulated (e.g., using frequency shift keying) and transmitted using frequency hopped spread spectrum. The bandwidth of the transmitted data is therefore spread within the ISM band".
Ce paragraphe concerne la transmission.
On distingue bien les mots Audio et Video.