Patent ID: 8774317
Filing Date: 2014-07-08
Classification: G04G,G04R

Abstract:
1. A radio receiver method, said method comprising: receiving broadcast signal data frames comprising phase modulation (PM) over a legacy amplitude modulated (AM) signal, said broadcast signal transmitted as ‘0’ and ‘1’ bits encoded with time information separate from timing information, said timing information based on a known synchronization sequence spanning multiple seconds beginning at a known point within each data frame; extracting said time and timing information from the phase of said received signal; wherein said phase modulation comprises discontinuous binary phase shift keying (BPSK) modulation, wherein carrier amplitude transmitted during low portions of a bit is zero; wherein information represented by said phase modulation is independent of information represented by said legacy amplitude modulation; wherein said ‘0’ bit is represented by said legacy amplitude modulated signal transmitted without a phase inversion; and wherein said ‘1’ bit is represented by said legacy amplitude modulated signal transmitted with a 180 degree phase inversion.