Digital satellite broadcast receiver

Abstract

With a conventional digital satellite broadcast receiver, it is occasionally impossible to obtain satisfactory reception performance, as under poor reception conditions. To overcome this, the digital satellite broadcast receiver of the invention has a tuner circuit for selecting a broadcast signal of a desired channel from among signals fed thereto, a demodulator circuit for demodulating the broadcast signal selected by the tuner circuit, and a control circuit, having a reception condition evaluator, for controlling the demodulator circuit by varying the settings thereof according to the reception conditions. This makes it possible to obtain satisfactory reception performance under any reception conditions.

Description

(1) Technical field [0001] The present invention relates to a digital satellite broadcast receiver. (2) Background technology [0002] Fig. 5 shows the configuration of a conventional digital satellite broadcast receiver. A conventional digital satellite broadcast receiver 3' is equipped with a tuner circuit 4, a QPSK (Quadrature Phase Shift Keying) demodulator circuit 5', a signal processing circuit 6, and a microcomputer 7'. The high frequency signal output from the satellite is received by the antenna 1 and then down-converted to an intermediate frequency signal by the LNB (Low Noise Block Converter) 2 . The intermediate frequency signal is then sent to the digital satellite broadcasting receiver 3'. [0003] In the digital satellite broadcasting receiver 3', the intermediate frequency signal is sent to the tuner circuit 4. Tuning performed by the tuning circuit 4 is controlled based on the channel frequency data S2 of the channel that the user desires to receive fed i...

AI Technical Summary

Problems solved by technology

However, in this analog satellite broadcast receiver, only the transfer characteristic of the loop filter is changed according to the reception state, so sometimes the received image cannot be optimized depending on the reception state (for example, when the input signal of the FM demodulator When there is a considerably high level due to adjacent interfering waves)

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