SINGLE FREQUENCY NETWORK SYSTEM OF DIGITAL TELEVISION TRANSMISSION USING STUDIO-TRANSMITTER LINK FOR AN ANALOG BROADCASTING

摘要

An SFN(Single Frequency Network) system using an STL(Studio to Transmitter Link) for analog broadcasting in a digital TV transmitter is provided to compose an SFN using a conventional analog STL system without an additional cost, and delay a signal by a desired time and transmit the delayed signal by composing a digital delay unit in each transmitter. An I/Q(Inphase/Quadrature) demodulating unit(51) demodulates an IF(Intermediate Frequency) signal into a baseband I/Q signal. A digital processor(52) compensates and delays the channel distortion of the signal outputted from the I/Q demodulating unit. An I/Q modulating unit(53) modulates the signal outputted through the digital processor. A frequency up-converter(54) converts the output signal of the I/Q modulating unit into a desired frequency band. An HPA(High Power Amplifier)(55) amplifies the signal converted in the frequency up-converter.