Externally powered radio frequency modulator

摘要

An apparatus for enabling display of composite audio and video (AV) signals on a television set with a coaxial input connector is disclosed. The apparatus receives composite AV signals through a single tip AV connector and delivers AV signal on a coaxial output. The apparatus receives low voltage DC power from a USB connector.

主权项

1. A method, for modulating composite audio signal and video signal into an audio and video signal on a coaxial output, comprising the steps of:
receiving, by a USB connector, a low voltage DC power from an external source; powering a modulating circuit by the low voltage DC power; receiving a composite audio signal to form a received audio signal; receiving a composite video signal to form a received video signal; modulating the received audio signal and the received video signal to form a combined audio and video signal; and outputting the combined audio and video signal on a coaxial output connector.