Method and equipment for transmitting digital-analog audio broadcasting

Abstract

The invention discloses a method and equipment for transmitting digital-analog audio broadcasting. In the method, an analog audio broadcasting signal and a digital audio broadcasting signal are synthesized into an analog and digital mixed-signal to share an analog audio broadcasting channel; or the analog audio broadcasting signal and the digital audio broadcasting signal are synthesized into the analog and digital mixed-signal to share the analog audio broadcasting channel, and the digital audio broadcasting signal also uses frequency bands which are adjacent to the shared channel of the analog audio broadcasting signal and the digital audio broadcasting signal. The power of the digital audio broadcasting signal is at least lower than the power 25dBc of the analog audio broadcasting signal. The bandwidth of the shared channel is 180 to 220 kHz. The adjacent frequency bands of the shared channel are the upper sideband and the lower sideband adjacent to the shared channel. The input ends of an analog audio modulation module and an digital audio modulation module are connected to an external audio source or a data source; the output ends are connected to a synthesis module for synthesizing the analog audio broadcasting signal and the digital audio broadcasting signal into the mixed signal; and the mixed signal is amplified by an amplifier and is transmitted by an antenna feedback system. By the method and the equipment, audio resources are saved and the frequency band using modes are flexible and varied.

Description

(1) Technical field [0001] The invention belongs to the technical field of digital audio broadcasting, and in particular relates to a transmitting method and equipment of digital-analog audio broadcasting. (2) Background technology [0002] Amplitude modulation (AM) broadcasting began in 1920, and frequency modulation (FM) broadcasting in 1940. In my country, from the 1950s to the 1960s, medium and short wave broadcasting developed rapidly. In the 1970s, FM broadcasting rose rapidly, the sound quality of broadcasting was significantly improved, and broadcasting technology was widely used. Although with the rapid development of TV, Internet, and mobile communication network, traditional audio broadcasting has once become a secondary important media method, and its development speed is far behind other major communication methods, but audio broadcasting has its specific application environment and Demand, is still a very important form of media, and with the emergence of new ...

AI Technical Summary

Problems solved by technology

[0017] It can be seen from the above that in the existing digital audio broadcasting technology, DAB technology needs to be completely digitized and is not compatible with the existing FM system; DRM+ technology uses single sideband modulation in spectrum allocation; HD Radio is aimed at the US FM Spectrum design, and the spectrum situation in my country is different from that in the United States. At the same time, the spectrum arrangement method of HD Radio is not flexible enough. It only supports digital modulation with symmetrical upper and lower sidebands, and cannot be broadcast simultaneously in the same channel.

[0018] The existing FM broadcasting in my country is mainly based on analog signals. Although it also defines the way that FM broadcasting uses baseband idle spectrum to modulate additional information, the additional digital sideband bandwidth is very narrow, and it is mainly used to transmit auxiliary data information, but cannot transmit digitized analog audio information

And at present, the actual domestic FM frequency intervals are 100kHz, 200kHz, 300kHz, 500kHz and 600kHz, etc., the frequency usage is complex, and there are still blank frequency resources that have not been fully utilized

Existing digital audio broadcasting technology is not applicable in our country

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