Patent ID: 6434171
Filing Date: 2002-08-13
Classification: H04N

Abstract:
A digital multiplex transmission apparatus in a digital multiplex transmission system for generating multiplexed information by multiplexing audio and video information of a plurality of programs and service information, modulating a carrier signal by the multiplexed information, frequency-converting a signal obtained by this modulation to a first high-frequency and transmitting the first high-frequency signal to a subscriber device via a transmission path, comprising:a transmission rate detector for detecting transmission rates of video information and audio information of programs; a total transmission rate calculation unit for calculating a total transmission rate of multiplexed video information and audio information of each program; a comparator for comparing a prescribed transmission rate, which is decided by a maximum transmission rate allowed for the transmission path, with the total transmission rate; and a service information transmission unit which, when the total transmission rate is greater than the prescribed transmission rate, is for transmitting the service information to the subscriber device via the transmission path using a second high-frequency signal that is different from the first high-frequency signal.