A multi-signal connector includes a first tuner, a first demodulator, a first radio frequency signal pin, a first ground signal pin and digital signal pins, and the first radio frequency signal pin transmits a first radio frequency signal. The first tuner receives the first radio frequency signal and outputs a first digital signal. The first demodulator receives the first digital signal and outputs an MPEG signal via the digital signal pins. The ground signal pin is disposed between the first radio frequency signal pin and the digital signal pins for reducing the interference and noise between the first radio frequency signal and the MPEG signal. A digital signal processing system is also disclosed.