DIRECT DIGITAL ENCODING AND RADIO FREQUENCY MODULATION FOR BROADCAST TELEVISION APPLICATION

摘要

A digital audio encoder (24), digital video conditioner (60), and a digital
modulator (26) are described for producing a television broadcast signal at a
desired channel frequency range. Left and right audio channel signals are
digitized and encoded according to a stereo standard and then combined to form
a stereo audio signal. A second audio programming channel signal may be
included. A video input can be digitized and conditioned to form a digital
video channel. The stereo audio signal can be placed directly at a desired
channel frequency by frequency modulation without the need for using an
intermediate frequency. The digital video channel can be placed at a desired
frequency by amplitude modulation. The digital and audio channels can be
digitally combined to create a television transmission signal at a desired
frequency and according to a desired standard.