Method for searching available frequency band used in digital broadcast receiving and retransmitting device

Abstract

This invention relates to one method to automatically useful waveband searching method in digital broadcasting radio and comprises one receiving digital broadcasting emission digital signals transferring device, one digital broadcasting signals to receive the digital broadcasting, one play device, wherein, the method can search the band in the tuning band and displays the band when it is found to provide the users with relative frequency band in on frequency codes.

Description

technical field [0001] The present invention relates to a method for automatically searching available frequency bands, especially a method for searching for unused frequency bands within a set FM band range, and using this frequency band as a transmission between a transmitting end device and a receiving end device method of carrier frequency. Background technique [0002] With the rapid development of information technology, the information available to the public has also progressed from oral communication, text media, radio, and television in the past to the present, which can be transmitted through the Internet, crossing national boundaries, and real-time information. Sound and video are transmitted to the other side of the earth. For people in the past, the method of broadcasting sound signals through broadcasting was mainly a media tool for the public to obtain the latest information from the outside world. The images and sounds played can have a greater visual shoc...

AI Technical Summary

Problems solved by technology

For people in the past, the method of broadcasting sound signals through broadcasting was mainly a media tool for the public to obtain the latest information from the outside world. The images and sounds played can have a greater visual shock to the public, thus making radio a secondary medium, and the number of people using radio has gradually declined and lost.

However, due to the past analog broadcasting technologies (such as FM amplitude modulation and AM frequency modulation), the sound quality is low, susceptible to interference, unfavorable to the quality of reception when moving fast, the broadcast quality will be affected by the transmission power, and the subcarrier cannot Cooperating with broadcasting stations to provide information services and other shortcomings, it has encountered difficult to solve bottlenecks in its operation, but until today, due to the advancement of digital technology, the above-mentioned problems have been solved through Digital Audio Broadcasting (DAB). Disadvantages, digital audio broadcasting was mainly determined by the WARC meeting in 1992, which includes VHF frequency band: 170-240MHz or L frequency band: 1452-1492MHz. The main advantage of digital audio broadcasting is that it can provide high-quality, dual-channel, The sound quality of multi-channel stereo broadcasting can be the same as that of CD records, and its reception quality is excellent in multi-path, shadow, moving and static environments, and it also has very high anti-interference and error The ability of code correction has high power efficiency, and its transmitter power is only one-tenth to one-hundredth of that of FM transmitter, which has less impact on the environment, and its coverage can reach 95%, and the time is effective 99% reliable, and can even send additional information

[0003] Although digital audio broadcasting has better audio playback quality and excellent audio reception quality than analog broadcasting, users who use general broadcast receiving and playing devices currently need to purchase digital broadcasting information in order to listen to digital broadcasting information. The broadcast receiver must replace or upgrade its original broadcast receiving and playing device before it can receive and play the content of digital broadcast information, which will cause a large burden on the use cost and cause inconvenience in use. Difficulty in popularizing and using digital broadcasting to the general public

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