Abstract: An automatic feedback adjustment device for a digital antenna includes a digital antenna unit, a trafficator, a tuner, a demodulator, an antenna direction driver unit, a secondary controller, and a primary controller. The digital antenna unit is a digital video/broadcasting antenna system. The trafficator is connected to the digital antenna unit to retrieve direction data associated with the actual elevation angle and direction. The tuner is connected to the digital antenna unit and the demodulator is connected to the tuner in order to receive and convert a transmission signal from a transmission terminal into the video data and a received-signal quality signal. The antenna direction driver unit is connected to the digital antenna unit in order to drive adjustment of direction and elevation angle of the antenna.

Abstract: A power-on error detection system and method applicable in an electronic device having a motherboard is proposed, wherein the motherboard is provided with a memory for storing a BIOS program and a signal outputting unit. The power-on error detection system and method are used to indicate an operation state of the electronic device while the electronic device reads the BIOS program at power-on and performs a POST (Power-on self-test) process. A first warning signal output command is set in the a segment of the BIOS program. The first warning signal output command drives the signal outputting unit to output a first warning signal after the electronic device is turned on and executes the POST process according to the BIOS program stored in the memory.

Abstract: The present invention relates to a foldable playyard for an infant, which is capable of expanding for play use and folding up for downsizing and benefiting storage. The present invention introduce a safety pin located at the joint element of lower frame of the foldable playyard. The safety pin will play an important role on keeping the foldable playyard in its expanding status, and will prevent the foldable playyard from malfunction which causes an unwanted folding up. The safety pin can also carry a pulled element to a released position and unlock the restrict of the joint element. The foldable playyard comes to foldable again.