Method for simultaneously broadcasting analogue radio and digital radio during digitalization reconstruction of analog AM broadcast transmitter
An implementation method and technology of AM broadcasting, applied in broadcasting circuit devices, broadcasting transmission systems, etc., can solve problems such as difficulty in large-scale promotion and implementation, difficulties in antenna deployment and network work, and asymmetric energy distribution of simulcast spectrum, etc., to achieve saving The effect of bandwidth
Inactive Publication Date: 2011-07-13
北京壹思达惟信息技术有限公司
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[0018] The working bandwidth of this scheme is four standard channels, and the frequency response of the transmitting system is required to meet the requirements up to ±18KHz or ±20KHz. At present, it is very demanding for AM broadcasting stations, and this scheme is the same as the 2.0 standard bandwidth scheme. The energy distribution of the broadcast spectrum is asymmetrical, and it is not easy to realize the good work of the antenna deployment network of the transmitting system
Therefore, although the program has great advantages in program quality, it is difficult to implement it on a large scale
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[0042] figure 2 For the present invention realizes the schematic diagram of the frequency spectrum arrangement of modulus simulcast, take my country's medium wave channel (9kHz) as example, analog program 5 occupies two standard channels, in this analog broadcast channel 1 adopts bilateral to the audio signal lower than 4.5kHz With modulation, and retain the carrier signal; in the adjacent channel 3, the audio signal higher than 4.5kHz is unilaterally modulated to improve the high frequency response of the analog audio program; the digital program 6 occupies another adjacent channel 2 of the analog broadcast channel 1 .
[0043] Figure 4 It is a schematic diagram of an implementation method of a residual SSB filter in the present invention, and the implementation method is as follows:
[0044] Use Matlab tools to design low-pass filters (a) and (b) to get a(n) and b(n), if the high-frequency cut-off frequency is required to be f r , then the filter (a) cutoff frequency is 4...
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The invention relates to a realization method for analog-digital simulcast during the process of digitalized modification of an analog amplitude-modulation broadcasting transmitter, which is a realization method for simultaneous broadcast of analog programs and digital programs during the process of modifying the analog amplitude-modulation broadcasting transmitter into a digital broadcasting (DRM) transmitter, in particular to a realization method for frequency spectrum arrangement on the basis of residual single side band filtering. The method of the invention adopts the residual single side band filtering on the analog programs, thereby high frequency response of the analog programs is improved; the method adopts full-bandwidth broadcasting on the digital programs, thereby all-digital quality is achieved. The invention is used for simultaneously broadcasting the analog programs and the digital programs during the process of digitalized modification of the analog amplitude-modulation broadcasting transmitter, and effectively saves bandwidth and realizes simulcast function of high quality analog amplitude-modulation broadcasting and full-bandwidth digital DRM broadcasting on the premise of not obviously reducing subjective listening quality.
Description
technical field [0001] The present invention is a method for realizing simultaneous broadcasting of analog broadcasting and digital broadcasting when an analog AM broadcasting transmitter is transformed into a digital broadcasting (DRM) transmitter, and particularly relates to a spectrum arrangement for analog-digital simultaneous broadcasting based on residual single-sideband filtering and its implementation method. Background technique [0002] In the process of digital transformation of analog AM radio transmitters, in order to realize the smooth transition from analog to digital and solve the shortage of frequency and equipment, the same transmitter can simultaneously broadcast analog AM radio programs and digital DRM programs according to different schemes. [0003] The so-called simulcast means that during the period of transition from analog to digital, the same transmitter is used to use the existing frequency (or occupy adjacent channel spectrum at the same time) to...
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IPC IPC(8): H04H20/44H04H20/71
Inventor 徐伟掌司璐吕锐卢起斌杨占昕王剑
Owner 北京壹思达惟信息技术有限公司
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