Patent ID: 7557862
Filing Date: 2009-07-07
Classification: H04H

Abstract:
1. A single chip set-top box integrated circuit, comprising: a digital BTSC encoder that is operable to encode first and second digital audio signals into a BTSC encoded signal, the first and second digital audio signals having a bandwidth defined by the frequency content of the first and second digital signals; a digital output modulator for receiving the BTSC encoded signal and generating a radio frequency (RF) modulated output signal that is provided off chip; and a BTSC decoder to receive a demodulated audio signal and to decode the demodulated audio signal for coupling to the digital BTSC encoder; wherein the digital BTSC encoder, BTSC decoder and digital output modulator are integrated on a same common substrate and constructed as a single complementary metal oxide semiconductor (CMOS) integrated circuit chip and wherein data is exchanged between the digital BTSC encoder and the BTSC decoder in a digital loopback mode to co-verify the data.