초록 ▼

A video signal provider multiplexes digital video signals for four channels and provides a signal the bandwidth of which is limited to 6 MHz by RF-modulation. An analog video signal provider provides another signal the bandwidth of which is limited to 6 MHz by RF-modulation. A digital audio signal p

A video signal provider multiplexes digital video signals for four channels and provides a signal the bandwidth of which is limited to 6 MHz by RF-modulation. An analog video signal provider provides another signal the bandwidth of which is limited to 6 MHz by RF-modulation. A digital audio signal provider multiplexes digital audio signals for 32 channels and provides another signal the bandwidth of which is limited to 6 MHz by RF-modulation. Such signals are combined and transmitted through a coaxial cable 14 to a controller. In this example, such signal providing apparatus can provide a maximum of 84 channels (=126 MHz (the bandwidth for video signal of the coaxial cable)/6 MHz×4 ch), which number is significantly larger than the 20 channels provided in the prior art.

대표청구항 ▼

A signal providing apparatus comprising: digital video signal outputting means for outputting a plurality of compressed digital video signals; time-division multiplexing means for multiplexing a plurality of said compressed digital video signals by time-division; digital video signal modulating mean

A signal providing apparatus comprising: digital video signal outputting means for outputting a plurality of compressed digital video signals; time-division multiplexing means for multiplexing a plurality of said compressed digital video signals by time-division; digital video signal modulating means for modulating the output signal from said time-division multiplexing means; frequency-division multiplexing means receiving the output signal from said digital video signal modulating means as a first input signal and a second input signal, for multiplexing said output signal from said digital video signal modulating means and said second input signal by frequency-division; tuner means receiving the output signal from said frequency-division multiplexing means, for demodulating said output signal from said frequency-division multiplexing means and for selecting a signal having a specific frequency; video signal selecting means for selecting one of said compressed digital video signals multiplexed by time-division in the output signal from said tuner means; expanding means for expanding the output signal from said video signal selecting means; and display means receiving the output signal from said expanding means, for displaying a video image; analog video signal outputting means for outputting an analog video signal; analog video signal modulating means for modulating said analog video signal and for providing a modulated analog video signal as said second input signal to said frequency-division multiplexing means; and decoding means for decoding said analog video signal, included in said output signal from said tuner means, into the output signal supplied to said display means; wherein said digital video modulating means and said analog video signal modulating means are RF-modulators modulating signals by carrier frequencies, each bandwidth of which is 6 MHz.