Satellite digital broadcast receiver with words information broadcast receiving function

Abstract

A satellite digital broadcast radio with the word information broadcast reception function relates to the technical field of digital radios using satellite broadcast. A signal output terminal of a high-frequency head demodulator within an L-waveband of the satellite digital broadcast radio is connected with a signal input terminal of a QPSK decoder; a signal output terminal of the QPSK decoder is connected with a signal input terminal of a voice broadcast data analyzer, and a signal output terminal of the voice broadcast data analyzer is connected with a signal input terminal of a voice retrieval power amplification output; a signal output terminal of an operation interface is connected with a first signal input terminal of an MCU controller and a peripheral circuit; a signal terminal of a word broadcast information memory is interconnected with a second signal terminal of the MCU controller and the peripheral circuit, and a signal output terminal of the word broadcast data analyzer is connected with a signal input terminal of a word information voice synthesis device. The satellite digital broadcast radio achieves the purposes of receiving the voice information and the word information on a satellite broadcast channel, and respectively outputting the information.

Description

technical field [0001] The present invention relates to the technical field of digital radios employing satellite broadcasting. Background technique [0002] At present, most of the radios used by people use the form of FM broadcasting, which mainly transmits audio signals in FM mode. The carrier of FM waves changes with the change of the audio modulation signal. If the frequency of the audio signal is 1KHZ, the frequency deviation of the carrier wave is also 1K times per second. The size of the frequency offset is determined by the amplitude of the audio signal. FM broadcasting is generally fixed frequency, and sometimes the frequency must be changed when it encounters interference. The requirement for tuning frequency is that stability is the overriding factor. There are four current tuning methods: (1) Variable capacitor tuning method, the circuit is simple and easy to adjust, but the stability is poor. (2) The varactor voltage tuning method is a big step forward comp...

AI Technical Summary

Problems solved by technology

There are four current tuning methods: (1) variable capacitance tuning method, its circuit is simple and easy to adjust, but its stability is poor, and it must be adjusted every once in a while, otherwise the frequency will drift, and the signal will not be received or will be distorted

(2) Varactor voltage tuning method, this method is a big step forward compared with variable capacitor tuning method, but the problem of frequency drift is still not fundamentally solved

The disadvantage of this method is that the crystal is generally multiplied multiple times, its harmonic components are many, the anti-interference is poor, the sensitivity is difficult to control, the frequency is fixed, and the crystal must be replaced when adjusting the frequency

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