Sharp Kabushiki Kaisha Corporation

Tsutomu Jitsuhara

Junichi Somei

Miyoshi Yamauchi

Hitoshi Ogino

Youichi Yuuki

Akio Ito

Toyomi Yonemaru

Akira Tokuda

Hitoshi Azuma

A receiver apparatushas a digital circuit portionthat converts a compressed digital signal outputted from a digital demodulating portioninto digital video and audio signals and a video/audio output circuitthat converts the digital video and audio signals outputted from the digital circuit portioninto analog video and audio signals. With this configuration, a video/audio processing IC for digital signal processing no longer needs to be mounted on the circuit board of a video display apparatus, and thus a receiver system can be realized with a video display apparatus having a simple configuration.

Receiver apparatus and receiver system

Receiver apparatus for outputting digital video and audio signals and receiver system incorporating the receiver apparatus

A receiving apparatus according to the present invention comprises: a first board including a mount surface whose outer edge is substantially quadrilateral; and a board installation member including a plate portion that has an installation surface whose outer edge is substantially quadrilateral, the first board is installed on the installation surface (called a front surface) side and the surface (called a rear surface) of the rear side of the installation surface is installed on a given second board, the apparatus applies a predetermined processing to a received broadcast signal using a circuit disposed on the first board, and the board installation member includes a connecting terminal to electrically connect the first board with the second board and a leg portion used for the installation on the second board, the connecting terminal protrudes from the plate portion in the direction substantially perpendicular to the plate portion on the front surface side and on the rear surface side, and comes into contact with the first board on the front surface side and comes into contact with the second board on the rear surface side, and the leg portion protrudes from the plate portion in the direction substantially perpendicular to the plate portion on the rear surface side.

Receiving apparatus and board installation member

A wireless video receiving apparatus is provided with a first voltage-controlled clock generation portion that can generate a video dot clock having a relatively high frequency and a second voltage-controlled clock generation portion that can generate a video dot clock having a relatively low frequency. A digital video signal compressed on the side of a transmitting apparatus is fed to a digital video signal decompression portion. The frequency of a horizontal synchronizing signal of an analog video signal fed to the side of a transmitting apparatus has been measured on the transmitting apparatus side, and a clock generated by the first or second voltage-controlled clock generation portion according to the frequency thus measured is fed to the digital video signal decompression portion, and then the compressed signal is decompressed.

Wireless video transmission system

A wireless receiving device of the present invention is so arranged that (i) a high-frequency circuit section is provided on a front surface of a printed board and (ii) a digital video signal processing section and a wireless LAN digital signal processing section are provided on a back surface of the printed board. Further, an earth pattern is provided in a middle position between the front and back surfaces of the printed board, so that (i) the high-frequency circuit section and (ii) the digital video signal processing section and the wireless LAN digital signal processing section are shielded from one another using electromagnetic shielding by the earth pattern. Thus, when members that are commonly used for the wireless LAN and for wireless video reception are formed on a single printed board in order to reduce the size of the printed board, it is possible to effectively reduce the lowering of signal quality caused by the noise.

Growing community of inventors

Higashiosaka, Japan

Tsutomu Jitsuhara