Video audio processing device and standby and return method thereof

A video audio processing device for processing video and audio signals of digital television broadcasts, the device comprising:

• a signal processing block including an instruction memory and performing signal processing in accordance with a program loaded into the instruction memory;
• a main storage section having a self-refresh function and being accessible from the signal processing block;
• an auxiliary storage section for storing the program for making the signal processing block perform the signal processing;
• and
• a control section for, upon receipt of a standby instruction, performing control in such a manner as to transfer the program from the auxiliary storage section to the main storage section, and set self-refresh in the main storage section, and upon receipt of a return instruction, performing control in such a manner as to cancel the self-refresh in the main storage section, load the program from the main storage section to the instruction memory in the signal processing block, and activate the signal processing block,
• wherein the main storage section includes a plurality of storage devices;
• the video audio processing device includes a plurality of power supply circuits for controlling power supply to the respective storage devices;
• and
• upon receipt of the standby instruction, the control section controls one of the power supply circuits that is associated with a storage device to which the program is transferred in such a manner that the one of the power supply circuits supplies power to that storage device, and controls the other power supply circuits in such a manner that power supply therefrom is stopped.

A video audio processing device for processing video and audio signals of digital television broadcasts, the device comprising:

• a signal processing block including an instruction memory and performing signal processing in accordance with a program loaded into the instruction memory;
• a main storage section having a self-refresh function and being accessible from the signal processing block;
• an auxiliary storage section for storing the program for making the signal processing block perform the signal processing;
• a control section for, upon receipt of a standby instruction, performing control in such a manner as to transfer the program from the auxiliary storage section to the main storage section, and set self-refresh in the main storage section, and upon receipt of a return instruction, performing control in such a manner as to cancel the self-refresh in the main storage section load the program from the main storage section to the instruction memory in the signal processing block, and activate the signal processing block;
• and
• an operational mode switching section for switching an operational mode relating to standby and return of the video audio processing device between a high speed mode, in which the various controls performed by the control section are validated, and a normal mode, in which the various controls performed by the control section are invalidated.

A standby and return method of a video audio processing device, which processes video and audio signals and which includes a signal processing block including an instruction memory and performing signal processing in accordance with a program loaded into the instruction memory, a main storage section having a self-refresh function and being accessible from the signal processing block, and an auxiliary storage section for storing the program for making the signal processing block perform the signal processing, the method comprising:

• a step of, upon receipt of a standby instruction, transferring the program from the auxiliary storage section to the main storage section;
• a step of putting the main storage section in a self-refresh state after the transfer of the program;
• a step of, upon receipt of a return instruction, canceling the self-refresh state of the main storage section;
• a step of loading the program from the main storage section to the instruction memory in the signal processing block after the cancellation of the self-refresh state;
• and
• a step of activating the signal processing block after the loading of the program.

A standby and return method of a video audio processing device, which processes video and audio signals of digital television broadcasts and which includes a signal processing block including an instruction memory and performing signal processing in accordance with a program loaded into the instruction memory, a main storage section having a self-refresh function and being accessible from the signal processing block, and an auxiliary storage section for storing the program for making the signal processing block perform the signal processing, wherein the main storage section includes a plurality of storage devices, and the method comprising:

• a step of upon receipt of a standby instruction, transferring the program from the auxiliary storage section to the main storage section;
• a step of putting the main storage section in a self-refresh state after the transfer of the program;
• a step of upon receipt of a return instruction, canceling the self-refresh state of the main storage section;
• a step of loading the program from the main storage section to the instruction memory in the signal processing block after the cancellation of the self-refresh state;
• a step of activating the signal processing block after the loading of the program;
• and
• a step of, upon receipt of the standby instruction, supplying power to one of the storage devices to which the program is transferred, while stopping power supply to the other storage devices.