Abstract: An HDMI signal processing system and a signal processing method are provided. The system includes a signal-receiving unit, an audio-extracting unit, and an audio-processing unit. An HDMI signal from an HDMI signal source is received at the signal-receiving unit. An audio signal is extracted from the received HDMI signal by the audio-extracting unit. The extracted audio signal is processed by the audio-processing unit.

Abstract: A multimedia signal control device including a signal-connecting unit and a remote control unit is disclosed. The signal-connecting unit is used for connecting to a portable data-processing device and to a multimedia playback device. The multimedia signal outputted by either of the connected devices is converted into a converted multimedia signal processible to the other of the connected devices by the signal-connecting unit. The converted multimedia signal is transmitted to the other one of the connected devices. The remote control unit connects to the signal-connecting unit and transmits a control signal to the signal-connecting unit. The signal-connecting unit transmits the control signal to one of the connected devices, so as to control the operation of the connected device.