METHOD FOR JOINT TRANSMISSION OF DIGITAL AND ANALOG MODULATED RADIO BROADCAST SIGNALS AND/OR TV BROADCAST SIGNALS

摘要

FIELD: radio communication. SUBSTANCE: method involves transmission of at least one digital radio or TV broadcast signal in same channel as analog TV broadcast signal. Frequency band of at least one digital radio and/or TV broadcast signal is limited to frequency band, which is less than width of at least one channel. Decreased influence of at least one digital radio and/or TV broadcast signal onto analog TV signal is achieve by means of decreasing level of at least one digital radio and/or TV broadcast signal down below threshold value, while maximal level of analog TV signal is greater than threshold value, which is significantly greater than level of at least one digital radio and/or TV broadcast signal. Cross modulation between analog and digital modulated radio and/or TV broadcast signals is prevented by means of decreasing amplitude of frequency spectrum of at least one digital radio and/or TV broadcast signal down below threshold value, which is significantly less than carrier amplitude of analog image signal of TV broadcast. EFFECT: increased throughput capacity. 21 cl, 8 dwg