| 摘要 |
A reception system receiving the broadcast wave of a digital broadcast to acquire the video or audio signal of the broadcast has: a tuner circuit detecting the broadcast wave at a predetermined frequency to convert it into an intermediate-frequency signal; and a receiver device having a first terminal connected to the tuner circuit to receive the intermediate-frequency signal by way of the first terminal. The receiver device has, arranged on a single circuit board: a digital demodulation circuit portion receiving the intermediate-frequency signal to demodulate it; a digital circuit portion decompressing the signal demodulated by the digital demodulation circuit portion; a video/audio output circuit portion converting the digital video or audio signal decompressed by the digital circuit portion into an analog video or audio signal; and a power supply portion supplying electric power to the digital demodulation circuit portion, the digital circuit portion, and the video/audio output circuit portion. A chassis is provided so as to cover the digital demodulation circuit portion, the digital circuit portion, the video/audio output circuit portion, and the power supply portion but not to cover the first terminal. With this construction, it is possible to minimize the entry of noise into the tuner circuit without imposing restrictions on the layout of the different components for the processing of broadcast signals and that can diminish the fabrication cost of a video display device. |
